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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>加贝龙</title>
<link href="/atom.xml" rel="self"/>
<link href="http://yoursite.com/"/>
<updated>2017-04-08T07:22:18.000Z</updated>
<id>http://yoursite.com/</id>
<author>
<name>Holo Wang</name>
</author>
<generator uri="http://hexo.io/">Hexo</generator>
<entry>
<title>Cordova ： 自定义Plugin</title>
<link href="http://yoursite.com/2017/04/08/Cordova_custom_plugin/"/>
<id>http://yoursite.com/2017/04/08/Cordova_custom_plugin/</id>
<published>2017-04-08T07:18:44.000Z</published>
<updated>2017-04-08T07:22:18.000Z</updated>
<content type="html"><![CDATA[<h3 id="Cordova之自定义Plugin"><a href="#Cordova之自定义Plugin" class="headerlink" title="Cordova之自定义Plugin"></a>Cordova之自定义Plugin</h3><p>本文通过自定义一个简单的Toast插件来介绍一下如何从0开始自定义自己的plugin，基于cordova6.2.1版本。在这之前你需要创建一个Cordova项目，如何创建一个Corodva项目可以参考<a href="http://kidloserme.github.io/2016/11/25/Cordova_Plugin_2016-11-25/" target="_blank" rel="external">Cordova：Plugin</a>中的1-5步骤，这里不在赘述。</p>
<h4 id="1-原生插件开发"><a href="#1-原生插件开发" class="headerlink" title="1.原生插件开发"></a>1.原生插件开发</h4><p>首先创建一个<code>ToastPlugin</code>，我把他放在了主工程中，所有自定义的<code>Plugin</code>都是继承自<code>CordovaPlugin</code>，然后重写<code>CordovaPlugin</code>的<code>execute</code>方法来实现插件的功能，<code>CordovaPlugin</code>中定义了三个<code>execute</code>，这里我选择重写方法<code>public boolean execute(String action, JSONArray args, CallbackContext callbackContext)</code>，至于重写哪个好，全凭自己喜欢。下面看下<code>ToastPlugin</code>的代码：</p>
<a id="more"></a>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ToastPlugin</span> <span class="keyword">extends</span> <span class="title">CordovaPlugin</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">private</span> String ACTION_TOAST = <span class="string">"toast"</span>;</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * <span class="doctag">@param</span> action 具体要执行的动作，由H5传入</div><div class="line"> * <span class="doctag">@param</span> args 参数列表，H5传入</div><div class="line"> * <span class="doctag">@param</span> callbackContext 回调</div><div class="line"> * <span class="doctag">@return</span> true:有效的action false:无效的action</div><div class="line"> * <span class="doctag">@throws</span> JSONException</div><div class="line"> */</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">execute</span><span class="params">(String action, JSONArray args,</span></span></div><div class="line"> CallbackContext callbackContext) <span class="keyword">throws</span> JSONException {</div><div class="line"> <span class="keyword">if</span> (ACTION_TOAST.equals(action)) {</div><div class="line"> toast(args.getString(<span class="number">0</span>), callbackContext);</div><div class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * 处理toast逻辑</div><div class="line"> *</div><div class="line"> * <span class="doctag">@param</span> content toast弹出的内容</div><div class="line"> * <span class="doctag">@param</span> callbackContext 回调</div><div class="line"> */</div><div class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">toast</span><span class="params">(String content, CallbackContext callbackContext)</span> </span>{</div><div class="line"> Toast.makeText(cordova.getActivity(), content, Toast.LENGTH_LONG).show();</div><div class="line"> PluginResult pluginResult = <span class="keyword">new</span> PluginResult(PluginResult.Status.OK,</div><div class="line"> <span class="string">"this is toast callback content !"</span>);</div><div class="line"> callbackContext.sendPluginResult(pluginResult);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>上面就是一个简单的插件，<code>execute</code>是入口，接收H5发送过来的请求，根据具体的action来执行不同的逻辑，并根据结果来通过<code>callbackContext</code>发送回调结果。<br><strong>参数理解：</strong><br><strong>action：</strong> 应该很好理解的，比如我们现在写的是一个对话框插件，可能就会有按钮操作，那么需要定义三个action:alert, cancel, confirm。根据不同的action执行不同的逻辑。<br><strong>args：</strong> 参数，是一个数组的形式，H5在调用的时候会把参数封装成一个json数组格式的字符串。<br><strong>callbackContext：</strong> 原生插件通过这个参数来给H5发送反馈，当然这个不是必须的，根据需要来写。发送的数据类型为<code>PluginResult</code>,状态<code>PluginResult.Status.OK</code>表示成功，状态’PluginResult.Status.ERROR’表示失败，当然还是有其他类型的状态，可以查看<code>luginResult.Status</code>的具体定义。</p>
<h4 id="2-注册原生插件"><a href="#2-注册原生插件" class="headerlink" title="2.注册原生插件"></a>2.注册原生插件</h4><p>第1步中创建了一个原生插件，下一步就是注册插件，只有注册了插件，在Cordova初始化的时候才能根据注册信息来获取该插件并实例化，后面调用的时候才能找得到它。配置的地方就是res目录下的xml目录下的config.xml文件。在其中加一个节点：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"><?xml version='1.0' encoding='utf-8'?></div><div class="line"><span class="tag"><<span class="name">widget</span> <span class="attr">id</span>=<span class="string">"com.helong.cordova"</span> <span class="attr">version</span>=<span class="string">"1.0.0"</span> </span></div><div class="line"> <span class="attr">xmlns</span>=<span class="string">"http://www.w3.org/ns/widgets"</span> </div><div class="line"> <span class="attr">xmlns:cdv</span>=<span class="string">"http://cordova.apache.org/ns/1.0"</span>></div><div class="line"> <span class="tag"><<span class="name">feature</span> <span class="attr">name</span>=<span class="string">"Whitelist"</span>></span></div><div class="line"> <span class="tag"><<span class="name">param</span> <span class="attr">name</span>=<span class="string">"android-package"</span> <span class="attr">value</span>=<span class="string">"org.apache.cordova.whitelist.WhitelistPlugin"</span> /></span></div><div class="line"> <span class="tag"><<span class="name">param</span> <span class="attr">name</span>=<span class="string">"onload"</span> <span class="attr">value</span>=<span class="string">"true"</span> /></span></div><div class="line"> <span class="tag"></<span class="name">feature</span>></span></div><div class="line"> <span class="tag"><<span class="name">feature</span> <span class="attr">name</span>=<span class="string">"Toast"</span>></span></div><div class="line"> <span class="tag"><<span class="name">param</span> <span class="attr">name</span>=<span class="string">"android-package"</span> <span class="attr">value</span>=<span class="string">"com.helong.plugin.ToastPlugin"</span> /></span></div><div class="line"> <span class="tag"></<span class="name">feature</span>></span></div><div class="line"> .....此处为节省空间省略</div><div class="line"><span class="tag"></<span class="name">widget</span>></span></div></pre></td></tr></table></figure></p>
<p>一个<code>feature</code>代表一个原生插件，属性<code>name</code>是这个原生插件的名字，<code>param</code>的<code>android-package</code>用来指定这个插件的具体实现类。<br>OK，配置完毕，这样原生部分的工作已经完成了。下面看js方面的工作。</p>
<h4 id="3-js插件开发"><a href="#3-js插件开发" class="headerlink" title="3.js插件开发"></a>3.js插件开发</h4><p>首先在assets目录下的plugins目录下创建一个目录，作为新js插件的目录，目录名cordova-plugin-toast，然后在此目录下创建新的目录，目录名www，最后在www目录下创建我们的js插件toast.js，看图：<br><img src="../../../../images/cordova/createjs.png" alt="Alt text"><br>接下来是具体的实现：<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line">cordova.define(<span class="string">"cordova-plugin-toast.toast"</span>, <span class="function"><span class="keyword">function</span>(<span class="params">require, exports, module</span>) </span>{</div><div class="line"> <span class="keyword">var</span> exec = <span class="built_in">require</span>(<span class="string">'cordova/exec'</span>);</div><div class="line"> <span class="keyword">var</span> platform = <span class="built_in">require</span>(<span class="string">'cordova/platform'</span>);</div><div class="line"> <span class="built_in">module</span>.exports = {</div><div class="line"> <span class="attr">toast</span>: <span class="function"><span class="keyword">function</span>(<span class="params">message, completeCallback</span>) </span>{</div><div class="line"> <span class="keyword">var</span> _message = (<span class="keyword">typeof</span> message === <span class="string">"string"</span> ? message : <span class="built_in">JSON</span>.stringify(message));</div><div class="line"> <span class="comment">//success, fail, service, action, args</span></div><div class="line"> exec(completeCallback, <span class="literal">null</span>, <span class="string">"Toast"</span>, <span class="string">"toast"</span>, [_message]);</div><div class="line"> },</div><div class="line"> };</div><div class="line">});</div></pre></td></tr></table></figure></p>
<p>代码中define的第一个参数”cordova-plugin-toast.toast”是这个plugin的id，在后面会用到。<br>插件的实现部分在module.exports部分，这里面定义了一个函数名字叫<code>toast</code>，有两个参数分别是要展示的内容以及回调，通过exec执行，将内容以及回调传递给原生插件，也就是步骤1中我们写的原生插件。<br><strong>exec说明：</strong><br>exec就是函数<code>function androidExec(success, fail, service, action, args)</code>，具体实现可以看exec.js，在assets/www/corodva-js-src目下，接收的五个参数具体说一下。</p>
<ul>
<li>success是成功回调，对应步骤1中PluginResult的Status.OK</li>
<li>fail是失败回调，对应PluginResult的Status.ERROR</li>
<li>service就是我们原生插件名称，也就是步骤2中注册原生插件中<code>feature</code>节点的<code>name</code>属性定义的名字。</li>
<li>action就是我们原生插件实现是定义的一系列action，步骤一中也有说明，原生插件接到请求根据service找到插件，然后再根据action执行具体的逻辑。</li>
<li>args就是参数，json数组格式，步骤一中也有说明<br>好了，js插件开发完毕，下一步跟原生一样，注册插件。</li>
</ul>
<h4 id="3-注册js插件"><a href="#3-注册js插件" class="headerlink" title="3.注册js插件"></a>3.注册js插件</h4><p>找到此文件assets/www/cordova_plugins.js，我们的js插件需要在这里进行注册了才能被访问，因为cordova.js在加载的时候会从这里面读取信息。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line">cordova.define(<span class="string">'cordova/plugin_list'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">require, exports, module</span>) </span>{</div><div class="line"><span class="built_in">module</span>.exports = [</div><div class="line"> {</div><div class="line"> <span class="string">"id"</span>: <span class="string">"cordova-plugin-toast.toast"</span>,</div><div class="line"> <span class="string">"file"</span>: <span class="string">"plugins/plugin-toast/www/toast.js"</span>,</div><div class="line"> <span class="string">"pluginId"</span>: <span class="string">"cordova-plugin-toast"</span>,</div><div class="line"> <span class="string">"clobbers"</span>: [</div><div class="line"> <span class="string">"toast123"</span></div><div class="line"> ]</div><div class="line"> }</div><div class="line">];</div><div class="line"><span class="built_in">module</span>.exports.metadata = </div><div class="line"><span class="comment">// TOP OF METADATA</span></div><div class="line">{</div><div class="line"> <span class="string">"cordova-plugin-whitelist"</span>: <span class="string">"1.3.2"</span>,</div><div class="line"> <span class="string">"cordova-plugin-toast"</span>: <span class="string">"0.0.1"</span></div><div class="line">};</div><div class="line"><span class="comment">// BOTTOM OF METADATA</span></div><div class="line">});</div></pre></td></tr></table></figure></p>
<p>这里的module.exports是一个Json数组，每一项代表一个插件，说一下插件配置每一项的意思：<br><strong>id：</strong> 就是定义js插件define的第一个参数，在步骤3中已经说明。<br><strong>file：</strong> 很好理解，就是我们js插件所在的路径<br><strong>pluginId：</strong> 插件的pluginId，下面在设置版本信息的时候会用到，其他地方有没有用到，暂时没遇到<br><strong>clobbers：</strong> 这个类似于实例，我们在后面用到js插件的时候就是通过这名称来调用插件里面的函数的，是个数组，可以定义成多个名字。还有另外一种方式，就是使用<code>merges</code>定义，代表允许不同的js插件可以取一个相同的实例名称，例如cordova官方的一个demo如下。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line">{</div><div class="line"> <span class="string">"id"</span>: <span class="string">"cordova-plugin-dialogs.notification"</span>,</div><div class="line"> <span class="string">"file"</span>: <span class="string">"plugins/cordova-plugin-dialogs/www/notification.js"</span>,</div><div class="line"> <span class="string">"pluginId"</span>: <span class="string">"cordova-plugin-dialogs"</span>,</div><div class="line"> <span class="string">"merges"</span>: [</div><div class="line"> <span class="string">"navigator.notification"</span></div><div class="line"> ]</div><div class="line">},</div><div class="line">{</div><div class="line"> <span class="string">"id"</span>: <span class="string">"cordova-plugin-dialogs.notification_android"</span>,</div><div class="line"> <span class="string">"file"</span>: <span class="string">"plugins/cordova-plugin-dialogs/www/android/notification.js"</span>,</div><div class="line"> <span class="string">"pluginId"</span>: <span class="string">"cordova-plugin-dialogs"</span>,</div><div class="line"> <span class="string">"merges"</span>: [</div><div class="line"> <span class="string">"navigator.notification"</span></div><div class="line"> ]</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>OK ，js插件已经注册完毕，下面就是使用了吧。</p>
<h4 id="4-调用js插件"><a href="#4-调用js插件" class="headerlink" title="4.调用js插件"></a>4.调用js插件</h4><p>这里用一个比较简单的例子，就是在设备准备好的时候执行这个js。我们在assets/www/js目录下新建一个ready.js文件，然后编码<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">success</span>(<span class="params">message</span>) </span>{</div><div class="line"> alert(message);</div><div class="line">}</div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">onDeviceReady</span>(<span class="params"></span>)</span>{</div><div class="line"> toast123.toast(<span class="string">'Hello My Plaugin !'</span>,success);</div><div class="line">}</div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">"deviceready"</span>, onDeviceReady, <span class="literal">false</span>);</div></pre></td></tr></table></figure></p>
<p>嗯，就是监听deviceready事件，然后进行响应，捕获到此事件后进行toast，并接收回调。</p>
<h4 id="5-加载js文件"><a href="#5-加载js文件" class="headerlink" title="5.加载js文件"></a>5.加载js文件</h4><p>插件的开发以及调用都已经开发完毕，最后一步就是执行了吧。这里使用assets/www/index.html，app启动时默认加载这个html，我们就再这里调用4中的ready.js文件。在原先的html中加入js引用<code><script type="text/javascript" src="js/ready.js"></script></code>。<br>万事俱备，只差运行了吧。</p>
<h4 id="6-运行"><a href="#6-运行" class="headerlink" title="6.运行"></a>6.运行</h4><p>看效果图，下面是toast的内容，上面的对话框里的内容就是我们原生插件设置callback时 的内容。<br><img src="../../../../images/cordova/run.png" alt="Alt text"></p>
<p>一个简单的插件完成了，算是入门了，剩下的就要靠自己了。</p>
]]></content>
<summary type="html">
<h3 id="Cordova之自定义Plugin"><a href="#Cordova之自定义Plugin" class="headerlink" title="Cordova之自定义Plugin"></a>Cordova之自定义Plugin</h3><p>本文通过自定义一个简单的Toast插件来介绍一下如何从0开始自定义自己的plugin，基于cordova6.2.1版本。在这之前你需要创建一个Cordova项目，如何创建一个Corodva项目可以参考<a href="http://kidloserme.github.io/2016/11/25/Cordova_Plugin_2016-11-25/">Cordova：Plugin</a>中的1-5步骤，这里不在赘述。</p>
<h4 id="1-原生插件开发"><a href="#1-原生插件开发" class="headerlink" title="1.原生插件开发"></a>1.原生插件开发</h4><p>首先创建一个<code>ToastPlugin</code>，我把他放在了主工程中，所有自定义的<code>Plugin</code>都是继承自<code>CordovaPlugin</code>，然后重写<code>CordovaPlugin</code>的<code>execute</code>方法来实现插件的功能，<code>CordovaPlugin</code>中定义了三个<code>execute</code>，这里我选择重写方法<code>public boolean execute(String action, JSONArray args, CallbackContext callbackContext)</code>，至于重写哪个好，全凭自己喜欢。下面看下<code>ToastPlugin</code>的代码：</p>
</summary>
<category term="Cordova" scheme="http://yoursite.com/categories/Cordova/"/>
<category term="Cordova" scheme="http://yoursite.com/tags/Cordova/"/>
</entry>
<entry>
<title>Android项目集成小米、华为、个推</title>
<link href="http://yoursite.com/2016/11/25/JingoalPush_2016-11-25/"/>
<id>http://yoursite.com/2016/11/25/JingoalPush_2016-11-25/</id>
<published>2016-11-25T11:16:33.000Z</published>
<updated>2016-11-25T11:28:42.000Z</updated>
<content type="html"><![CDATA[<p>为了项目中方便使用，首先要把这三家push sdk集成到一个library项目中，并将通过广播接收到的推送消息统一分发到一个广播中，在主项目中直接引用此项目即可。<br>项目地址：<a href="https://github.com/kidloserme/JingoalPushDemo" target="_blank" rel="external">JingoalPushDemo</a><br>集成很简单：</p>
<h3 id="1-添加项目依赖"><a href="#1-添加项目依赖" class="headerlink" title="1.添加项目依赖"></a>1.添加项目依赖</h3><p>项目中导入pushlibrary,在主项目的build.gradle添加对libray项目的依赖:<br><code>compile project(':pushlibrary')</code></p>
<h3 id="2-申请帐号"><a href="#2-申请帐号" class="headerlink" title="2.申请帐号"></a>2.申请帐号</h3><p>在三个平台注册开发者帐号，并创建自己的应用，获取所需要的appid、appkey等信息，华为的需要打包签名文件的SHA256值，这个在新建华为帐号的时候会有说明。<br>小米推送需要信息：APPID , APPKEY<br>个推推送需要信息：APPID , APPKEY，APPSECRET<br>华为推送需要信息：华为推送客户端不需要设置这些参数，只要保证包名以及打包签名文件的SHA256信息跟开发者平台配置的一样即可。</p>
<a id="more"></a>
<h3 id="3-配置个推so库"><a href="#3-配置个推so库" class="headerlink" title="3.配置个推so库"></a>3.配置个推so库</h3><p>下载个推的so库文件，放入主项目的libs目录下，并在主项目的build.gradle项目中添加依赖配置，位于android节点里面：<br><figure class="highlight gradle"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">sourceSets</span> {</div><div class="line"> main {</div><div class="line"> jniLibs.srcDirs = [<span class="string">'libs'</span>]</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<h3 id="4-配置小米、个推的APPID、APPKEY信息"><a href="#4-配置小米、个推的APPID、APPKEY信息" class="headerlink" title="4.配置小米、个推的APPID、APPKEY信息"></a>4.配置小米、个推的APPID、APPKEY信息</h3><p>在defaultConfig节点下添加配置信息，下面配置中的*<em>*</em>我是为了隐藏自己的信息的，有一个地方需要注意，小米的APPID和APPKEY都是纯数字，在配置的时候需要在前面加上\\0，切记。<br><figure class="highlight gradle"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line">defaultConfig {</div><div class="line"> ...(省略默认配置)</div><div class="line"> <span class="comment">//第三方推送所需要的APPID、APPKEY的配置</span></div><div class="line"> manifestPlaceholders = [</div><div class="line"> GETUI_APP_ID : <span class="string">"lHv2qKvQNK9FCSlcL****"</span>,</div><div class="line"> GETUI_APP_KEY : <span class="string">"Tcd6DHuozvAu7iQEl****"</span>,</div><div class="line"> GETUI_APP_SECRET: <span class="string">"SaeqLmuJcy5xjNLz****"</span>,</div><div class="line"> <span class="comment">//因为小米的appkey 和 appid 为纯数字,必须要在前面加上\0,</span></div><div class="line"> <span class="comment">//程序中才能正确从meta-data中读取,下面的\\0的第一个\为转义字符</span></div><div class="line"> MI_PUSH_APPID: <span class="string">"\\028823037615175****"</span>,</div><div class="line"> MI_PUSH_APPKEY: <span class="string">"\\0597175232****"</span>,</div><div class="line"> PACKAGE_NAME : applicationId</div><div class="line"> ]</div><div class="line">}</div></pre></td></tr></table></figure></p>
<h3 id="5-设置debug签名文件"><a href="#5-设置debug签名文件" class="headerlink" title="5.设置debug签名文件"></a>5.设置debug签名文件</h3><p>这个是为了方便测试华为推送而设置的，如果你把默认签名文件的SHA256设置到华为推送配置中，就不用设置了。<br>将debug.keystore拷贝到主项目目录下：<br><img src="../../../../images/pushsdk/keystore.png" alt="DebugKeystore"><br>在build.gradle的android节点下添加配置：<br><figure class="highlight gradle"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line">signingConfigs {</div><div class="line"> debug {</div><div class="line"> storeFile <span class="keyword">file</span>(<span class="string">"debug.keystore"</span>)</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line">buildTypes {</div><div class="line"> debug {</div><div class="line"> minifyEnabled <span class="keyword">false</span></div><div class="line"> signingConfig signingConfigs.debug</div><div class="line"> }</div><div class="line"> release {</div><div class="line"> minifyEnabled <span class="keyword">false</span></div><div class="line"> proguardFiles getDefaultProguardFile(<span class="string">'proguard-android.txt'</span>), <span class="string">'proguard-rules.pro'</span></div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<h3 id="6-清单文件中添加权限配置以及广播接收器"><a href="#6-清单文件中添加权限配置以及广播接收器" class="headerlink" title="6.清单文件中添加权限配置以及广播接收器"></a>6.清单文件中添加权限配置以及广播接收器</h3><p>添加以下权限：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="comment"><!-- 自定义权限 --></span></div><div class="line"><span class="tag"><<span class="name">uses-permission</span> <span class="attr">android:name</span>=<span class="string">"getui.permission.GetuiService.${PACKAGE_NAME}"</span>/></span></div><div class="line"><span class="comment"><!--替换为第三方应用的包名--></span></div><div class="line"><span class="tag"><<span class="name">permission</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"getui.permission.GetuiService.${PACKAGE_NAME}"</span></div><div class="line"> <span class="attr">android:protectionLevel</span>=<span class="string">"normal"</span>/></div><div class="line"><span class="tag"><<span class="name">permission</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"${PACKAGE_NAME}.permission.MIPUSH_RECEIVE"</span></div><div class="line"> <span class="attr">android:protectionLevel</span>=<span class="string">"signature"</span>/></div><div class="line"></div><div class="line"><span class="tag"><<span class="name">uses-permission</span> <span class="attr">android:name</span>=<span class="string">"${PACKAGE_NAME}.permission.MIPUSH_RECEIVE"</span>/></span></div><div class="line"><span class="tag"><<span class="name">uses-permission</span> <span class="attr">android:name</span>=<span class="string">"android.permission.VIBRATE"</span>/></span></div></pre></td></tr></table></figure></p>
<p>配置meta属性：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div></pre></td><td class="code"><pre><div class="line"><span class="comment"><!-- 配置的第三方参数属性 --></span></div><div class="line"><span class="comment"><!-- 个推Push配置 --></span></div><div class="line"><span class="tag"><<span class="name">meta-data</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"PUSH_APPID"</span></div><div class="line"> <span class="attr">android:value</span>=<span class="string">"${GETUI_APP_ID}"</span>/></div><div class="line"><span class="tag"><<span class="name">meta-data</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"PUSH_APPKEY"</span></div><div class="line"> <span class="attr">android:value</span>=<span class="string">"${GETUI_APP_KEY}"</span>/></div><div class="line"><span class="tag"><<span class="name">meta-data</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"PUSH_APPSECRET"</span></div><div class="line"> <span class="attr">android:value</span>=<span class="string">"${GETUI_APP_SECRET}"</span>/></div><div class="line"><span class="comment"><!-- 小米Push配置 --></span></div><div class="line"><span class="tag"><<span class="name">meta-data</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"MI_PUSH_APPID"</span></div><div class="line"> <span class="attr">android:value</span>=<span class="string">"${MI_PUSH_APPID}"</span>/></div><div class="line"><span class="tag"><<span class="name">meta-data</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"MI_PUSH_APPKEY"</span></div><div class="line"> <span class="attr">android:value</span>=<span class="string">"${MI_PUSH_APPKEY}"</span>/></div></pre></td></tr></table></figure></p>
<p>添加广播接收器：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">receiver</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"com.jingoal.push.receiver.GeTuiReceiver"</span></div><div class="line"> <span class="attr">android:exported</span>=<span class="string">"false"</span>></div><div class="line"> <span class="tag"><<span class="name">intent-filter</span>></span></div><div class="line"> <span class="tag"><<span class="name">action</span> <span class="attr">android:name</span>=<span class="string">"com.igexin.sdk.action.${GETUI_APP_ID}"</span>/></span></div><div class="line"> <span class="tag"></<span class="name">intent-filter</span>></span></div><div class="line"><span class="tag"></<span class="name">receiver</span>></span></div><div class="line"><span class="tag"><<span class="name">provider</span></span></div><div class="line"> <span class="attr">android:name</span>=<span class="string">"com.igexin.download.DownloadProvider"</span></div><div class="line"> <span class="attr">android:authorities</span>=<span class="string">"downloads.${PACKAGE_NAME}"</span></div><div class="line"> <span class="attr">android:exported</span>=<span class="string">"true"</span></div><div class="line"> <span class="attr">android:process</span>=<span class="string">":igepushservice"</span>/></div></pre></td></tr></table></figure></p>
<h3 id="7-接收消息"><a href="#7-接收消息" class="headerlink" title="7.接收消息"></a>7.接收消息</h3><p>以上0-5的配置完毕之后就剩下最后一步了，在项目中创建一个广播接收器用来接收推送消息！<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> android.content.Context;</div><div class="line"><span class="keyword">import</span> android.util.Log;</div><div class="line"><span class="keyword">import</span> com.jingoal.push.receiver.JingoalReceiver;</div><div class="line"><span class="keyword">import</span> com.jingoal.push.sdk.JingoalPushManager;</div><div class="line"><span class="keyword">import</span> com.jingoal.pushsdk3.MainActivity;</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyJingoalReceiver</span> <span class="keyword">extends</span> <span class="title">JingoalReceiver</span> </span>{</div><div class="line"></div><div class="line"> <span class="meta">@Override</span> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onReceivePassThroughMessage</span><span class="params">(Context context, String message)</span> </span>{</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"========================"</span>);</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"透传消息: "</span> + message);</div><div class="line"> <span class="keyword">if</span>(MainActivity.getInstance()!=<span class="keyword">null</span>) {</div><div class="line"> MainActivity.getInstance().setRecvPushMessage(message);</div><div class="line"> }</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"========================"</span>);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onNotificationMessageClicked</span><span class="params">(Context context, String message)</span> </span>{</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"========================"</span>);</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"小米消息: "</span> + message);</div><div class="line"> <span class="keyword">if</span>(MainActivity.getInstance()!=<span class="keyword">null</span>) {</div><div class="line"> MainActivity.getInstance().setRecvPushMessage(message);</div><div class="line"> }</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"========================"</span>);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onCommandResult</span><span class="params">(Context context, String command, <span class="keyword">boolean</span> success)</span> </span>{</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"command :"</span> + command);</div><div class="line"> Log.i(<span class="string">"holo_push"</span>, <span class="string">"command Result :"</span> + success);</div><div class="line"> <span class="keyword">if</span>(JingoalReceiver.COMMAND_REGISTER.equals(command)) {</div><div class="line"> Log.i(<span class="string">"holo_push"</span>,</div><div class="line"> <span class="string">"clientType: "</span> + JingoalPushManager.getClientType() + <span class="string">""</span>);</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p><code>onReceivePassThroughMessage</code>:用来接收华为和个推的透传消息。<br><code>onNotificationMessageClicked</code>:因为小米推送在程序杀掉后无法接收透传消息，只能接收通知栏消息，所以这里集成的是通知栏自定义动作消息，就是在点击通知栏消息时我们客户端才能拿到真正的消息内容。<br><code>onCommandResult</code>:用来接收客户端注册push，设置别名，删除别名等command的结果的回调，因为华为官方给出服务端的API已经不支持标签和别名，所以这个方法对华为无意义。</p>
<p>接收的Receiver也创建完毕，在清单文件中配置一下就OK啦：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">receiver</span> <span class="attr">android:name</span>=<span class="string">".receiver.MyJingoalReceiver"</span>></span></div><div class="line"> <span class="tag"><<span class="name">intent-filter</span>></span></div><div class="line"> <span class="tag"><<span class="name">action</span> <span class="attr">android:name</span>=<span class="string">"com.jingoal.push.receiver.jingoalreceiver"</span>/></span></div><div class="line"> <span class="tag"></<span class="name">intent-filter</span>></span></div><div class="line"><span class="tag"></<span class="name">receiver</span>></span></div></pre></td></tr></table></figure></p>
<p>OK，现在运行项目，通过各开发者平台发送消息看能不能接收到吧。<br>注意：华为的开发者平台推送消息时要通过手机的IMEI号来推送，集成到项目中时，服务端要通过token来推送。</p>
]]></content>
<summary type="html">
<p>为了项目中方便使用，首先要把这三家push sdk集成到一个library项目中，并将通过广播接收到的推送消息统一分发到一个广播中，在主项目中直接引用此项目即可。<br>项目地址：<a href="https://github.com/kidloserme/JingoalPushDemo">JingoalPushDemo</a><br>集成很简单：</p>
<h3 id="1-添加项目依赖"><a href="#1-添加项目依赖" class="headerlink" title="1.添加项目依赖"></a>1.添加项目依赖</h3><p>项目中导入pushlibrary,在主项目的build.gradle添加对libray项目的依赖:<br><code>compile project(&#39;:pushlibrary&#39;)</code></p>
<h3 id="2-申请帐号"><a href="#2-申请帐号" class="headerlink" title="2.申请帐号"></a>2.申请帐号</h3><p>在三个平台注册开发者帐号，并创建自己的应用，获取所需要的appid、appkey等信息，华为的需要打包签名文件的SHA256值，这个在新建华为帐号的时候会有说明。<br>小米推送需要信息：APPID , APPKEY<br>个推推送需要信息：APPID , APPKEY，APPSECRET<br>华为推送需要信息：华为推送客户端不需要设置这些参数，只要保证包名以及打包签名文件的SHA256信息跟开发者平台配置的一样即可。</p>
</summary>
<category term="Push" scheme="http://yoursite.com/categories/Push/"/>
</entry>
<entry>
<title>Cordova：Plugin</title>
<link href="http://yoursite.com/2016/11/25/Cordova_Plugin_2016-11-25/"/>
<id>http://yoursite.com/2016/11/25/Cordova_Plugin_2016-11-25/</id>
<published>2016-11-25T06:37:51.000Z</published>
<updated>2016-11-25T07:09:51.000Z</updated>
<content type="html"><![CDATA[<p>跟着<a href="http://kidloserme.github.io/2016/11/22/Cordova_Helloword_2016-11-22/" target="_blank" rel="external">Cordova：HelloWord</a>搞定了怎么创建一个Android项目之后，看看怎么使用Cordova的Plugin吧。<br>因为使用命令行创建的项目导图AS时报错，有问题，所以这里直接创建一个项目，然后将需要的文件拷贝到项目中去即可。</p>
<blockquote>
<p>1.添加插件</p>
</blockquote>
<p>首先要通过cordova命令添加所需要的插件，此次测试一个比较简单的插件dialog，添加的命令<code>cordova plugin add cordova-plugin-dialogs</code>，看下图：<br><img src="../../../../images/cordova/add_plugin.png" width="70%" align="center"><br>OK，添加成功了，从上图中可以看到进入到android/assets/www/plugins目录中已经有我们刚才添加的插件了，下面开始看怎么使用他吧。</p>
<a id="more"></a>
<blockquote>
<p>2.创建新工程</p>
</blockquote>
<p>下面是心创建的一个全新的项目HelloCordova<br><img src="../../../../images/cordova/create_hello_cordova.png" width="70%" align="center"></p>
<blockquote>
<p>3.引入CordovaLib库</p>
</blockquote>
<h5 id="3-1首先创建一个Library"><a href="#3-1首先创建一个Library" class="headerlink" title="3.1首先创建一个Library"></a>3.1首先创建一个Library</h5><p><img src="../../../../images/cordova/new_lib_module.png" width="70%" align="center"></p>
<p><img src="../../../../images/cordova/cordovalib.png" width="70%" align="center"></p>
<h5 id="3-2拷贝CordovaLib源文件"><a href="#3-2拷贝CordovaLib源文件" class="headerlink" title="3.2拷贝CordovaLib源文件"></a>3.2拷贝CordovaLib源文件</h5><p>Library创建完成后将我们需要的代码拷贝进来，要拷贝的代码在此目录下：<br><img src="../../../../images/cordova/lib_src.png" width="70%" align="center"><br>直接拷贝到项目中：<br><img src="../../../../images/cordova/copySrcToLib.png" width="70%" align="center"></p>
<h5 id="3-3拷贝Plugin源代码"><a href="#3-3拷贝Plugin源代码" class="headerlink" title="3.3拷贝Plugin源代码"></a>3.3拷贝Plugin源代码</h5><p>Plugin的源代码在android/src目录下：<br><img src="../../../../images/cordova/pluginSrc.png" width="70%" align="center"><br>拷贝后：<br><img src="../../../../images/cordova/copyPluginSrcToLib.png" width="70%" align="center"><br>Device是创建项目的时候就有的，dialogs就是我们刚才添加的。</p>
<h5 id="3-4拷贝Cordova配置文件"><a href="#3-4拷贝Cordova配置文件" class="headerlink" title="3.4拷贝Cordova配置文件"></a>3.4拷贝Cordova配置文件</h5><p>下面要拷贝的是res目录下的config文件，同样是拷贝到cordovalib的res目录下：<br><img src="../../../../images/cordova/configfile.png" width="70%" align="center"></p>
<p><img src="../../../../images/cordova/copyConfigToLib.png" width="70%" align="center"><br>config.xml的内容感兴趣的可以自己搜一下，里面主要是配置一些插件信息以及项目信息</p>
<blockquote>
<p>4.拷贝H5资源</p>
</blockquote>
<p>H5资源位于android/assets目录下：<br><img src="../../../../images/cordova/H5Resource.png" width="70%" align="center"></p>
<p>H5资源拷贝到主工程同样的位置：<br><img src="../../../../images/cordova/CopyH5Resource.png" width="70%" align="center"></p>
<blockquote>
<p>5.Activity加载</p>
</blockquote>
<p>首先要在主工程的build.gradle中添加对cordovalib的依赖：<br><img src="../../../../images/cordova/addCompileLib.png" width="70%" align="center"></p>
<p>直接使用android/src下的MainActivity:<br><img src="../../../../images/cordova/main.png" width="70%" align="center"><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line">public class MainActivity extends CordovaActivity {</div><div class="line"> @Override</div><div class="line"> public void onCreate(Bundle savedInstanceState) {</div><div class="line"> super.onCreate(savedInstanceState);</div><div class="line"></div><div class="line"> // enable Cordova apps to be started in the background</div><div class="line"> Bundle extras = getIntent().getExtras();</div><div class="line"> if (extras != null && extras.getBoolean("cdvStartInBackground", false)) {</div><div class="line"> moveTaskToBack(true);</div><div class="line"> }</div><div class="line"></div><div class="line"> Log.e("holo_cordova", "launchUrl: " + launchUrl);</div><div class="line"> // Set by <content src="index.html" /> in config.xml</div><div class="line"> loadUrl(launchUrl);</div><div class="line"></div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>看注释<code>loadUrl(launchUrl);</code>中的launchUrl是在res/xml/config.xml中配置的，对应的是assets/www/index.html.<br>OK，基本搞定了80%，下面就是对index.html改造，引入我们刚才添加的Plugin dialogs.</p>
<blockquote>
<p>6.在js文件中使用dialogs Plugin</p>
</blockquote>
<p>首先我们在assets/js目录下创建一个js文件，就叫dialogsplugin.js，然后开始编码：<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">onConfirm</span>(<span class="params">buttonIndex</span>) </span>{</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">'confirm dialog cancel ..........'</span>);</div><div class="line"> navigator.notification.alert(<span class="string">'You selected button '</span> + buttonIndex);</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">'confirm dialog cancel __________'</span>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">onDeviceReady</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">'will alert confirm dialog'</span>);</div><div class="line"> navigator.notification.confirm(</div><div class="line"> <span class="string">'You are the winner xx!'</span>, <span class="comment">// message</span></div><div class="line"> onConfirm, <span class="comment">// callback to invoke with index of button pressed</span></div><div class="line"> <span class="string">'Game Over'</span>, <span class="comment">// title</span></div><div class="line"> [<span class="string">'Restart'</span>,<span class="string">'Exit'</span>] <span class="comment">// buttonLabels</span></div><div class="line"> );</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">'confirm dialog alert end'</span>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">"deviceready"</span>, onDeviceReady, <span class="literal">false</span>);</div></pre></td></tr></table></figure></p>
<p>js编码完成，在html中引入就大功告成了<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><script type="text/javascript" src="js/dialogsplugin.js"></script></div></pre></td></tr></table></figure></p>
<p>然后运行项目,看效果图：<br><img src="../../../../images/cordova/urwinner.png" width="70%" align="center"></p>
]]></content>
<summary type="html">
<p>跟着<a href="http://kidloserme.github.io/2016/11/22/Cordova_Helloword_2016-11-22/">Cordova：HelloWord</a>搞定了怎么创建一个Android项目之后，看看怎么使用Cordova的Plugin吧。<br>因为使用命令行创建的项目导图AS时报错，有问题，所以这里直接创建一个项目，然后将需要的文件拷贝到项目中去即可。</p>
<blockquote>
<p>1.添加插件</p>
</blockquote>
<p>首先要通过cordova命令添加所需要的插件，此次测试一个比较简单的插件dialog，添加的命令<code>cordova plugin add cordova-plugin-dialogs</code>，看下图：<br><img src="../../../../images/cordova/add_plugin.png" width = "70%" align=center /><br>OK，添加成功了，从上图中可以看到进入到android/assets/www/plugins目录中已经有我们刚才添加的插件了，下面开始看怎么使用他吧。</p>
</summary>
<category term="Cordova" scheme="http://yoursite.com/categories/Cordova/"/>
<category term="Cordova" scheme="http://yoursite.com/tags/Cordova/"/>
</entry>
<entry>
<title>Cordova ： HelloWord</title>
<link href="http://yoursite.com/2016/11/22/Cordova_Helloword_2016-11-22/"/>
<id>http://yoursite.com/2016/11/22/Cordova_Helloword_2016-11-22/</id>
<published>2016-11-22T10:50:33.000Z</published>
<updated>2016-11-22T11:06:31.000Z</updated>
<content type="html"><![CDATA[<p>开发环境Mac OS,另外Android的开发环境也需要提前搭建好。</p>
<blockquote>
<p>1.安装Node.js</p>
</blockquote>
<p>官网下载最新的<a href="http://nodejs.cn/download/安装包，并安装，安装成功后命令行执行npm" target="_blank" rel="external">http://nodejs.cn/download/安装包，并安装，安装成功后命令行执行npm</a> -version会打印出当前Node的版本号。</p>
<blockquote>
<p>2.安装Cordova</p>
</blockquote>
<p>到Cordova官网，也有安装的步骤：<a href="http://cordova.apache.org/#getstarted" target="_blank" rel="external">http://cordova.apache.org/#getstarted</a><br><code>sudo npm install -g cordova</code>，这一步可能会比较慢，耐心等待。<br>安装完成后命令行执行<code>cordova -v</code>会打印当前Cordova的版本信息。</p>
<blockquote>
<p>3.创建项目</p>
</blockquote>
<p>上面的两个步骤安装完成就可以通过cordova命令创建一个Cordova项目，看一下怎么创建，执行命令：<code>cordova create --help</code>查看帮助信息。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line">➜ Cordova cordova create --help </div><div class="line">Synopsis</div><div class="line"></div><div class="line"> cordova create <PATH> [ID [NAME [CONFIG]]] [options]</div><div class="line"></div><div class="line">Create a Cordova project</div><div class="line"></div><div class="line"> PATH ......................... Where to create the project</div><div class="line"> ID ........................... Reverse-domain-style package name - used in <widget id></div><div class="line"> NAME ......................... Human readable name</div><div class="line"> CONFIG ....................... json string whose key/values will be included in</div><div class="line"> [PATH]/.cordova/config.json</div><div class="line"></div><div class="line">Options</div><div class="line"></div><div class="line"> --template=<PATH|NPM PACKAGE|GIT URL> ... use a custom template located locally, in NPM, or GitHub.</div><div class="line"> --copy-from|src=<PATH> .................. deprecated, use --template instead.</div><div class="line"> --link-to=<PATH> ........................ symlink to custom www assets without creating a copy.</div><div class="line"> </div><div class="line">Example</div><div class="line"> cordova create myapp com.mycompany.myteam.myapp MyApp</div></pre></td></tr></table></figure></p>
<p>根据最后Example我来创建一个HelloWord的项目：<br><code>cordova create helloword com.holo.helloword HelloWord</code><br>控制台信息：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">➜ Cordova cordova create helloword com.holo.helloword HelloWord</div><div class="line">Using detached cordova-create</div><div class="line">Creating a new cordova project.</div><div class="line">➜ Cordova</div></pre></td></tr></table></figure></p>
<p>说明创建成功了,进入到项目目录下，并看一下helloword有哪些目录<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">➜ Cordova ls</div><div class="line">asApps helloword myApp3 pluginDemos</div><div class="line">➜ Cordova cd helloword </div><div class="line">➜ helloword ls</div><div class="line">config.xml hooks platforms plugins www</div><div class="line">➜ helloword</div></pre></td></tr></table></figure></p>
<p>这时候只是创建了一些基本信息，还不算一个项目，因为要创建的是一个Android项目，所以需要添加android平台，执行<code>cordova platform add android</code>,执行之前看一下platforms目录，是空的。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">➜ helloword cd platforms</div><div class="line">➜ platforms ls</div><div class="line">➜ platforms</div></pre></td></tr></table></figure></p>
<p>执行<code>cordova platform add android</code>：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div></pre></td><td class="code"><pre><div class="line">➜ platforms ls</div><div class="line">➜ platforms cd ..</div><div class="line">➜ helloword cordova platform add android </div><div class="line">Adding android project...</div><div class="line">Creating Cordova project for the Android platform:</div><div class="line"> Path: platforms/android</div><div class="line"> Package: com.holo.helloword</div><div class="line"> Name: HelloWord</div><div class="line"> Activity: MainActivity</div><div class="line"> Android target: android-24</div><div class="line">Subproject Path: CordovaLib</div><div class="line">Android project created with cordova-android@6.0.0</div><div class="line">Discovered plugin "cordova-plugin-whitelist" in config.xml. Adding it to the project</div><div class="line">Fetching plugin "cordova-plugin-whitelist@1" via npm</div><div class="line">Installing "cordova-plugin-whitelist" for android</div><div class="line">ANDROID_HOME=/Users/a1/Library/Android/sdk</div><div class="line">JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home</div><div class="line">Subproject Path: CordovaLib</div><div class="line">Starting a new Gradle Daemon for this build (subsequent builds will be faster).</div><div class="line">Incremental java compilation is an incubating feature.</div><div class="line">:clean</div><div class="line">:CordovaLib:clean</div><div class="line"></div><div class="line">BUILD SUCCESSFUL</div><div class="line"></div><div class="line">Total time: 8.353 secs</div><div class="line"></div><div class="line"> This plugin is only applicable for versions of cordova-android greater than 4.0. If you have a previous platform version, you do *not* need this plugin since the whitelist will be built in.</div><div class="line"> </div><div class="line">➜ helloword</div></pre></td></tr></table></figure></p>
<p>OK ,android项目创建成功了，如果中间遇到什么问题，请根据控制台中输出的错误信息修正就行了，我刚开始的时候是没安装Android sdk platfrom 24 就报错了。再次进入platforms文件夹：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">➜ helloword cd platforms</div><div class="line">➜ platforms ls</div><div class="line">android platforms.json</div><div class="line">➜ platforms</div></pre></td></tr></table></figure></p>
<p>会有一个android目录，这个就是一个继承了Cordova的安卓项目了。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">➜ android ls </div><div class="line">AndroidManifest.xml android.json build.gradle gradle libs project.properties settings.gradle</div><div class="line">CordovaLib assets cordova gradlew platform_www res src</div><div class="line">➜ android</div></pre></td></tr></table></figure></p>
<p>下面编译一下：<code>android cordova build android --info</code>.编译成功后进入下面的目录：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">➜ android cd build/outputs/apk </div><div class="line">➜ apk ls</div><div class="line">android-debug.apk</div><div class="line">➜ apk</div></pre></td></tr></table></figure></p>
<p>会有一个android-debug.apk文件，安装到手机上之后是下面这个样子：<br><img src="../../../../images/cordova_hello.png" width="40%" align="center"><br>既然显示的是HTML文件，那这个是哪个呢？<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">➜ android cd assets/www/ </div><div class="line">➜ www ls</div><div class="line">cordova-js-src cordova.js cordova_plugins.js css img index.html js</div><div class="line">➜ www</div></pre></td></tr></table></figure></p>
<p>就是assets/www目录下的index.html，这个是在res/xml/config.xml中配置的。<br>OK，第一步走的很艰难啊，看似简单，但是从0开始到运行一个HelloWord还是经过了很多心血的，不过第一步成功了，后面就好办多了^_^。</p>
<p>参考：<a href="http://www.cnblogs.com/zhoujg/p/4560998.html" target="_blank" rel="external">http://www.cnblogs.com/zhoujg/p/4560998.html</a></p>
]]></content>
<summary type="html">
如何搭建Cordova所需的环境以及创建第一个Cordova HelloWord项目
</summary>
<category term="Cordova" scheme="http://yoursite.com/categories/Cordova/"/>
<category term="Cordova" scheme="http://yoursite.com/tags/Cordova/"/>
</entry>
<entry>
<title>操作符Create</title>
<link href="http://yoursite.com/2016/09/24/RxJava_Create_2016-09-24/"/>
<id>http://yoursite.com/2016/09/24/RxJava_Create_2016-09-24/</id>
<published>2016-09-24T08:22:49.000Z</published>
<updated>2016-09-24T08:22:49.000Z</updated>
<content type="html"><![CDATA[<h3 id="1-Observables"><a href="#1-Observables" class="headerlink" title="1.Observables"></a>1.Observables</h3><p> 先认识几个重要的概念 </p>
<ul>
<li><strong>Observable</strong>：一个可观察对象或者被观察者</li>
<li><strong>Observer</strong>：观察者（订阅者）</li>
<li><strong>Subscribe</strong>：Observer的子类，比Observer多了onStart和unsubscribe两个方法</li>
</ul>
<p>在RxJava中，一个实现了Observer接口的对象可以订阅(subscribe)一个Observable 类的实例。订阅者(subscriber)对Observable发射(emit)的任何数据或数据序列作出响应。</p>
<a id="more"></a>
<h3 id="2-操作符Create"><a href="#2-操作符Create" class="headerlink" title="2.操作符Create"></a>2.操作符Create</h3><blockquote>
<p><strong>2.1 概要步骤：</strong></p>
</blockquote>
<ol>
<li>创建被观察者 <font style="color:red">Observable observable = new Observable();</font></li>
<li>创建观察者 <font color="green">Observer observer = new Observer();</font></li>
<li>观察者订阅被观察者 <font style="color:red">observable</font>.subscribe(<font color="green">observer</font>);</li>
</ol>
<blockquote>
<p><strong>2.2 实际使用：</strong></p>
</blockquote>
<pre style="background:#23241f;padding:7px 0px 0px 20px"><code style="background:#23241f;color:red;">
<span style="color:white">1.创建被观察者</span>
Observable<<span>String</span>> observable = Observable.create(<span>new</span> Observable.OnSubscribe<<span>String</span>>(){<br> <span>@Override</span> public <span>void</span> call(Subscriber<? <span>super</span> <span>String</span>> subscriber) {<br> <span style="color:gray">// TODO(HeLong.W): todo somthing</span><br> }<br>});<br>
</code></pre>
<pre style="background:#23241f;padding:7px 0px 0px 20px"><code style="background:#23241f;color:green;">
<span style="color:white">2.创建观察者</span>
Observer<String> observer = new Observer<String>() {
@Override public void onCompleted() {
}
@Override public void onError(Throwable e) {
}
@Override public void onNext(String o) {
}
};
<br></code></pre>
<pre style="color:white;background:#23241f;padding:7px 0px 0px 20px"><code style="background:#23241f;">
<span>3.观察者订阅被观察者</span><br><font style="color:red;">observable</font>.subscribe(<font style="color:green;">observer</font>);
</code>
</pre>
<pre style="color:white;background:#23241f;padding:7px 0px 0px 20px"><code style="background:#23241f;">
综合1、2、3来写：
<span style="color:red">Observable.create(new Observable.OnSubscribe<String>() {
@Override public void call(Subscriber<? super String> subscriber) {
subscriber.onNext("Hello");
subscriber.onCompleted();
}
})</span>.subscribe(<span style="color:green">new Subscriber<String>() {
@Override public void onCompleted() {
System.out.println("onCompleted exe");
}
@Override public void onError(Throwable e) {
}
@Override public void onNext(String s) {
System.out.println(s);
}
}</span>);<br>
</code></pre>
<blockquote>
<p><strong>2.3 源码分析</strong></p>
</blockquote>
<p>先看一下<code>Observable.create()</code>了什么</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*Observable.class*/</span></div><div class="line"><span class="keyword">public</span> <span class="keyword">static</span> <T> <span class="function">Observable<T> <span class="title">create</span><span class="params">(OnSubscribe<T> f)</span> </span>{</div><div class="line"> <span class="keyword">return</span> <span class="keyword">new</span> Observable<T>(hook.onCreate(f));</div><div class="line">}</div></pre></td></tr></table></figure>
<p>create方法很简单，就是调用了默认的构造器，并且传入一个构造器需要的参数，参数值由<code>hook.onCreate(f)</code>返回，先看看这个<code>hook.onCreate(f)</code>是什么鬼：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*Observable.class 中定义的hookd变量*/</span></div><div class="line">RxJavaObservableExecutionHook hook = RxJavaPlugins.getInstance().getObservableExecutionHook();</div><div class="line"></div><div class="line"><span class="comment">/*RxJavaObservableExecutionHook.class*/</span></div><div class="line"><span class="keyword">public</span> <T> <span class="function">OnSubscribe<T> <span class="title">onCreate</span><span class="params">(OnSubscribe<T> f)</span> </span>{</div><div class="line"> <span class="keyword">return</span> f;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>从上面的代码可以看到<code>hook.onCreate(f)</code>什么也没做，就是直接返回f，接下来看看默认的构造器干什么了:</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">protected</span> <span class="title">Observable</span><span class="params">(OnSubscribe<T> f)</span> </span>{</div><div class="line"> <span class="keyword">this</span>.onSubscribe = f;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>也是很简单的给自己的成员变量<code>onSubscribe</code>赋值而已。那么接下来看看这个<code>OnSubscribe</code>是什么呢？从上面的代码看OnSubscribe是<code>Observable</code>的一个内部类：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">OnSubscribe</span><<span class="title">T</span>> <span class="keyword">extends</span> <span class="title">Action1</span><<span class="title">Subscriber</span><? <span class="title">super</span> <span class="title">T</span>>> </span>{</div><div class="line"> <span class="comment">// cover for generics insanity</span></div><div class="line">}</div></pre></td></tr></table></figure>
<p>额，原来是一个接口，看他的超类定义：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> * A one-argument action.</div><div class="line"> * <span class="doctag">@param</span> <T> the first argument type</div><div class="line"> */</div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Action1</span><<span class="title">T</span>> <span class="keyword">extends</span> <span class="title">Action</span> </span>{</div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">call</span><span class="params">(T t)</span></span>;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>也很简洁，就是一个带有一个泛型参数的接口，那么上面的子类<code>OnSubscribe</code>就是指定了这个泛型的类型为<code>Subscriber</code>类型的，而指定的这个<code>Subscriber</code>就是后面要说的观察者。</p>
<p>看完了被观察者，再来看看观察者，一个接口类，提供了三个接口：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Observer</span><<span class="title">T</span>> </span>{</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">onCompleted</span><span class="params">()</span></span>;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">onError</span><span class="params">(Throwable e)</span></span>;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">onNext</span><span class="params">(T t)</span></span>;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>我们上面设置观察者的时候使用的是<code>Subscriber</code>，那么<code>Subscriber</code>跟<code>Observer</code>的关系是什么？</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">Subscriber</span><<span class="title">T</span>> <span class="keyword">implements</span> <span class="title">Observer</span><<span class="title">T</span>>, <span class="title">Subscription</span></span>{</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">void</span> <span class="title">unsubscribe</span><span class="params">()</span> </span>{</div><div class="line"> subscriptions.unsubscribe();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">boolean</span> <span class="title">isUnsubscribed</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">return</span> subscriptions.isUnsubscribed();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onStart</span><span class="params">()</span> </span>{</div><div class="line"> <span class="comment">// do nothing by default</span></div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>看上去有点复杂，多了几个方法，<code>onStart , unsubscribe , isUnsubscribed</code>.不多做说明，后面会说到，只需要知道<code>Subscriber</code>和<code>Observer</code>是继承关系即可，都可以作为观察者。<br>接下来看最关键的一部分了，观察者与被观察者关联的过程：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*Observable.class*/</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> Subscription <span class="title">subscribe</span><span class="params">(<span class="keyword">final</span> Observer<? <span class="keyword">super</span> T> observer)</span> </span>{</div><div class="line"> <span class="keyword">if</span> (observer <span class="keyword">instanceof</span> Subscriber) {</div><div class="line"> <span class="keyword">return</span> subscribe((Subscriber<? <span class="keyword">super</span> T>)observer);</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> subscribe(<span class="keyword">new</span> ObserverSubscriber<T>(observer));</div><div class="line"> }</div></pre></td></tr></table></figure>
<p>虽然有个if判断，但是两个分支最后走的是同一个方法，所以直接看这个<code>Subscription subscribe(Subscriber<? super T> subscriber)</code>实现：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*Observable.class*/</span></div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">final</span> Subscription <span class="title">subscribe</span><span class="params">(Subscriber<? <span class="keyword">super</span> T> subscriber)</span> </span>{</div><div class="line"> <span class="keyword">return</span> Observable.subscribe(subscriber, <span class="keyword">this</span>);</div><div class="line">}</div></pre></td></tr></table></figure>
<p>额，还没走到真正处理的地方，继续跟，一大波代码来临，终于看见了曙光：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">static</span> <T> <span class="function">Subscription <span class="title">subscribe</span><span class="params">(Subscriber<? <span class="keyword">super</span> T> subscriber, Observable<T> observable)</span> </span>{</div><div class="line"> <span class="keyword">if</span> (subscriber == <span class="keyword">null</span>) {</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"subscriber can not be null"</span>);</div><div class="line"> }</div><div class="line"> <span class="keyword">if</span> (observable.onSubscribe == <span class="keyword">null</span>) {</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"onSubscribe function can not be null."</span>);</div><div class="line"> }</div><div class="line"> subscriber.onStart();</div><div class="line"> <span class="keyword">if</span> (!(subscriber <span class="keyword">instanceof</span> SafeSubscriber)) {</div><div class="line"> subscriber = <span class="keyword">new</span> SafeSubscriber<T>(subscriber);</div><div class="line"> }</div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> hook.onSubscribeStart(observable, observable.onSubscribe).call(subscriber);</div><div class="line"> <span class="keyword">return</span> hook.onSubscribeReturn(subscriber);</div><div class="line"> } <span class="keyword">catch</span> (Throwable e) {</div><div class="line"> <span class="comment">//异常处理....</span></div><div class="line"> <span class="keyword">return</span> Subscriptions.unsubscribed();</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>又碰到了<code>hook</code>,看看<code>hook.onSubscribeStart(observable, observable.onSubscribe)</code>这个干嘛的：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <T> <span class="function">OnSubscribe<T> <span class="title">onSubscribeStart</span><span class="params">(Observable<? extends T> observableInstance, <span class="keyword">final</span> OnSubscribe<T> onSubscribe)</span> </span>{</div><div class="line"> <span class="comment">// pass through by default</span></div><div class="line"> <span class="keyword">return</span> onSubscribe;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>依然什么也没做，直接返回了第二个参数<code>onSubscribe</code>,那<code>hook.onSubscribeStart(observable, observable.onSubscribe).call(subscriber);</code>可以替换成<code>observable.onSubscribe.call(subscriber);</code>，接下来关键就看这个<code>call()</code>做了什么？先看看调用这个<code>call</code>的是谁？是<code>observable.onSubscribe</code>，那这个<code>observable.onSubscribe</code>又是谁？他就是我们第一步<code>create</code>时设置的<code>onSubscribe</code>！所以这里的<code>call</code>做了什么，取决于我们！一般我们就在<code>call</code>里面先处理数据，然后调用<code>onNext</code>方法即可。<br>最后看一下还有一个<code>return hook.onSubscribeReturn(subscriber)</code>,看一下内部实现：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <T> <span class="function">Subscription <span class="title">onSubscribeReturn</span><span class="params">(Subscription subscription)</span> </span>{</div><div class="line"> <span class="comment">// pass through by default</span></div><div class="line"> <span class="keyword">return</span> subscription;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>依然什么也没做，把参数直接返回了。那么返回的这个Subscription是干嘛用的，我们来看看：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Subscription</span> </span>{</div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">unsubscribe</span><span class="params">()</span></span>;</div><div class="line"> <span class="function"><span class="keyword">boolean</span> <span class="title">isUnsubscribed</span><span class="params">()</span></span>;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>原来是用来取消订阅观察的，如果调用了<code>unsubscribe()</code>后，这个观察者就不再起作用了。</p>
]]></content>
<summary type="html">
<h3 id="1-Observables"><a href="#1-Observables" class="headerlink" title="1.Observables"></a>1.Observables</h3><p> 先认识几个重要的概念 </p>
<ul>
<li><strong>Observable</strong>：一个可观察对象或者被观察者</li>
<li><strong>Observer</strong>：观察者（订阅者）</li>
<li><strong>Subscribe</strong>：Observer的子类，比Observer多了onStart和unsubscribe两个方法</li>
</ul>
<p>在RxJava中，一个实现了Observer接口的对象可以订阅(subscribe)一个Observable 类的实例。订阅者(subscriber)对Observable发射(emit)的任何数据或数据序列作出响应。</p>
</summary>
<category term="RxJava" scheme="http://yoursite.com/categories/RxJava/"/>
<category term="Rxjava_Create" scheme="http://yoursite.com/tags/Rxjava-Create/"/>
</entry>
<entry>
<title>Android MediaCodec 硬编码H264格式</title>
<link href="http://yoursite.com/2016/09/24/2016-03-09-mediacodec/"/>
<id>http://yoursite.com/2016/09/24/2016-03-09-mediacodec/</id>
<published>2016-09-23T16:56:16.000Z</published>
<updated>2016-09-24T08:09:23.000Z</updated>
<content type="html"><![CDATA[<p>最近在研究EasyDarwin的Push库EasyPuhser，EasyPuhser可以推送H264视频到Easydarwin服务器，终端可以通过rtsp协议访问该实时流，达到手机直播的功能，延迟基本在2秒以内。<br>EasyDarwinQQ群：496258327<br>本文主要记录一下最近研究的关于Android手机如何获取实时画面，并将数据编码为H264的格式的视频流，编码使用的是Android自带的MediaCodec，也就是硬解。<br>本demo的下载地址：<a href="https://github.com/kidloserme/MediaCodecDemo" target="_blank" rel="external">MediaCodecDemo</a></p>
<a id="more"></a>
<p>MediaCodec是Android在4.1中加入的新的API，目前也有很多文章介绍MediaCodec的用法，但是很多时候很多手机都失败，主要问题出现在调用dequeueOutputBuffer的时候总是返回-1，让你以为No buffer available !这里介绍一个开源项目<a href="https://github.com/fyhertz/libstreaming" target="_blank" rel="external">libstreaming</a>,我们借助此项目中封装的一个工具类<a href="https://github.com/fyhertz/libstreaming/tree/master/src/net/majorkernelpanic/streaming/hw" target="_blank" rel="external">EncoderDebugger</a>，来初始化MediaCodec会很好的解决此问题，目前为止测试了几个手机都可以成功，包括小米华为Moto。<br>看一下怎么使用的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">EncoderDebugger debugger = EncoderDebugger.debug(getApplicationContext(), width, height);</div><div class="line">MediaCodec mMediaCodec = MediaCodec.createByCodecName(debugger.getEncoderName());</div></pre></td></tr></table></figure>
<p>嗯，就这样。当然了，后面还是要根据需要对mMediaCodec设置其他参数的，看一下本demo中设置参数的过程吧</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">initMediaCodec</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">int</span> dgree = getDgree();</div><div class="line"> framerate = <span class="number">15</span>;</div><div class="line"> bitrate = <span class="number">2</span> * width * height * framerate / <span class="number">20</span>;</div><div class="line"> EncoderDebugger debugger = EncoderDebugger.debug(getApplicationContext(), width, height);</div><div class="line"> mConvertor = debugger.getNV21Convertor();</div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> mMediaCodec = MediaCodec.createByCodecName(debugger.getEncoderName());</div><div class="line"> MediaFormat mediaFormat;</div><div class="line"> <span class="keyword">if</span> (dgree == <span class="number">0</span>) {</div><div class="line"> <span class="comment">//dree==0的时候，需要将画面旋转90度，所以这里编码的时候需要将宽和高颠倒，</span></div><div class="line"> <span class="comment">//否则编码后的会面会出现四重画面并且花屏</span></div><div class="line"> mediaFormat = MediaFormat.createVideoFormat(<span class="string">"video/avc"</span>, height, width);</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> mediaFormat = MediaFormat.createVideoFormat(<span class="string">"video/avc"</span>, width, height);</div><div class="line"> }</div><div class="line"> mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, bitrate);</div><div class="line"> mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, framerate);</div><div class="line"> mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT,</div><div class="line"> debugger.getEncoderColorFormat());</div><div class="line"> mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, <span class="number">1</span>);</div><div class="line"> mMediaCodec.configure(mediaFormat, <span class="keyword">null</span>, <span class="keyword">null</span>, MediaCodec.CONFIGURE_FLAG_ENCODE);</div><div class="line"> mMediaCodec.start();</div><div class="line"> } <span class="keyword">catch</span> (IOException e) {</div><div class="line"> e.printStackTrace();</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>编码之前先看一下要编码的数据怎么获取吧，这个当然是来自Camera。<br>首先是创建SurfaceView用于预览视频画面，并设置回调，来监控生命周期。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">surfaceView = (SurfaceView) findViewById(R.id.sv_surfaceview);</div><div class="line">surfaceView.getHolder().addCallback(<span class="keyword">this</span>);</div><div class="line">surfaceView.getHolder().setFixedSize(getResources().getDisplayMetrics().widthPixels,</div><div class="line">getResources().getDisplayMetrics().heightPixels);</div></pre></td></tr></table></figure>
<p>然后是创建Camera的方法：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">boolean</span> <span class="title">ctreateCamera</span><span class="params">(SurfaceHolder surfaceHolder)</span> </span>{</div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> <span class="comment">//mCameraId=Camera.CameraInfo.CAMERA_FACING_BACK</span></div><div class="line"> mCamera = Camera.open(mCameraId);</div><div class="line"> Camera.Parameters parameters = mCamera.getParameters();</div><div class="line"> Camera.CameraInfo camInfo = <span class="keyword">new</span> Camera.CameraInfo();</div><div class="line"> Camera.getCameraInfo(mCameraId, camInfo);</div><div class="line"> <span class="keyword">int</span> cameraRotationOffset = camInfo.orientation;</div><div class="line"> <span class="comment">//设置预览格式NV21，他属于YUV420SP</span></div><div class="line"> parameters.setPreviewFormat(ImageFormat.NV21);</div><div class="line"> parameters.setPreviewSize(width, height);</div><div class="line"> mCamera.setParameters(parameters);</div><div class="line"> mCamera.autoFocus(<span class="keyword">null</span>);</div><div class="line"> <span class="comment">//计算preview画面需要旋转的角度。目前木有做横竖屏切换的时候无缝旋转画面，后面再搞。</span></div><div class="line"> <span class="keyword">int</span> displayRotation = (cameraRotationOffset - getDgree() + <span class="number">360</span>) % <span class="number">360</span>;</div><div class="line"> mCamera.setDisplayOrientation(displayRotation);</div><div class="line"> mCamera.setPreviewDisplay(surfaceHolder);</div><div class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</div><div class="line"> } <span class="keyword">catch</span> (Exception e) {</div><div class="line"> destroyCamera();</div><div class="line"> e.printStackTrace();</div><div class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">int</span> <span class="title">getDgree</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">int</span> rotation = getWindowManager().getDefaultDisplay().getRotation();</div><div class="line"> <span class="keyword">int</span> degrees = <span class="number">0</span>;</div><div class="line"> <span class="keyword">switch</span> (rotation) {</div><div class="line"> <span class="keyword">case</span> Surface.ROTATION_0:</div><div class="line"> degrees = <span class="number">0</span>;</div><div class="line"> <span class="keyword">break</span>; <span class="comment">// Natural orientation</span></div><div class="line"> <span class="keyword">case</span> Surface.ROTATION_90:</div><div class="line"> degrees = <span class="number">90</span>;</div><div class="line"> <span class="keyword">break</span>; <span class="comment">// Landscape left</span></div><div class="line"> <span class="keyword">case</span> Surface.ROTATION_180:</div><div class="line"> degrees = <span class="number">180</span>;</div><div class="line"> <span class="keyword">break</span>;<span class="comment">// Upside down</span></div><div class="line"> <span class="keyword">case</span> Surface.ROTATION_270:</div><div class="line"> degrees = <span class="number">270</span>;</div><div class="line"> <span class="keyword">break</span>;<span class="comment">// Landscape right</span></div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> degrees;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>摄像头创建完毕，就是开启预览</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> * 开启预览</div><div class="line"> */</div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">startPreview</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">if</span> (mCamera != <span class="keyword">null</span> && !started) {</div><div class="line"> mCamera.startPreview();</div><div class="line"> <span class="keyword">int</span> previewFormat = mCamera.getParameters().getPreviewFormat();</div><div class="line"> Camera.Size previewSize = mCamera.getParameters().getPreviewSize();</div><div class="line"> <span class="keyword">int</span> size = previewSize.width * previewSize.height</div><div class="line"> * ImageFormat.getBitsPerPixel(previewFormat)</div><div class="line"> / <span class="number">8</span>;</div><div class="line"> mCamera.addCallbackBuffer(<span class="keyword">new</span> <span class="keyword">byte</span>[size]);</div><div class="line"> mCamera.setPreviewCallbackWithBuffer(previewCallback);</div><div class="line"> started = <span class="keyword">true</span>;</div><div class="line"> btnSwitch.setText(<span class="string">"停止"</span>);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>上面就是设置了预览回调的方式，回调中将预览画面一帧一帧的返回给我们，给我们的数据就是NV21格式的,根据需要决定是否需要对数据进行旋转，旋转之后，就是转换，将NV21数据转为YUV420P格式的数据，然后就可以编码为H264数据了。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div></pre></td><td class="code"><pre><div class="line">Camera.PreviewCallback previewCallback = <span class="keyword">new</span> Camera.PreviewCallback() {</div><div class="line"> <span class="comment">//mSpsPps用来存储sps pps数据，后面遇到关键帧（I帧），必须将spspps数据加到I帧前面</span></div><div class="line"> <span class="keyword">byte</span>[] mSpsPps = <span class="keyword">new</span> <span class="keyword">byte</span>[<span class="number">0</span>];</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onPreviewFrame</span><span class="params">(<span class="keyword">byte</span>[] data, Camera camera)</span> </span>{</div><div class="line"> <span class="keyword">if</span> (data == <span class="keyword">null</span>) {</div><div class="line"> <span class="keyword">return</span>;</div><div class="line"> }</div><div class="line"> ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();</div><div class="line"> ByteBuffer[] outputBuffers = mMediaCodec.getOutputBuffers();</div><div class="line"> <span class="keyword">byte</span>[] dst = <span class="keyword">new</span> <span class="keyword">byte</span>[data.length];</div><div class="line"> Camera.Size previewSize = mCamera.getParameters().getPreviewSize();</div><div class="line"> <span class="keyword">if</span> (getDgree() == <span class="number">0</span>) {</div><div class="line"> <span class="comment">//手机竖屏的时候要将获取的数据顺时针旋转90度，否则画面不是正着的，而是逆时针90度</span></div><div class="line"> dst = Util.rotateNV21Degree90(data, previewSize.width, previewSize.height);</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> dst = data;</div><div class="line"> }</div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> <span class="keyword">int</span> bufferIndex = mMediaCodec.dequeueInputBuffer(<span class="number">5000000</span>);</div><div class="line"> <span class="keyword">if</span> (bufferIndex >= <span class="number">0</span>) {</div><div class="line"> inputBuffers[bufferIndex].clear();</div><div class="line"> <span class="comment">//将YUV420SP数据转换成YUV420P的格式，并将结果存入inputBuffers[bufferIndex]</span></div><div class="line"> mConvertor.convert(dst, inputBuffers[bufferIndex]);</div><div class="line"> mMediaCodec.queueInputBuffer(bufferIndex, <span class="number">0</span>,</div><div class="line"> inputBuffers[bufferIndex].position(),</div><div class="line"> System.nanoTime() / <span class="number">1000</span>, <span class="number">0</span>);</div><div class="line"> MediaCodec.BufferInfo bufferInfo = <span class="keyword">new</span> MediaCodec.BufferInfo();</div><div class="line"> <span class="keyword">int</span> outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo, <span class="number">0</span>);</div><div class="line"> <span class="keyword">while</span> (outputBufferIndex >= <span class="number">0</span>) {</div><div class="line"> ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];</div><div class="line"> <span class="keyword">byte</span>[] outData = <span class="keyword">new</span> <span class="keyword">byte</span>[bufferInfo.size];</div><div class="line"> <span class="comment">//从buff中读取数据到outData中</span></div><div class="line"> outputBuffer.get(outData);</div><div class="line"> <span class="comment">//记录pps和sps，pps和sps数据开头是0x00 0x00 0x00 0x01 0x67，</span></div><div class="line"> <span class="comment">// 0x67对应十进制103</span></div><div class="line"> <span class="keyword">if</span> (outData[<span class="number">0</span>] == <span class="number">0</span> && outData[<span class="number">1</span>] == <span class="number">0</span> && outData[<span class="number">2</span>] == <span class="number">0</span> </div><div class="line"> && outData[<span class="number">3</span>] == <span class="number">1</span> && outData[<span class="number">4</span>] == <span class="number">103</span>) {</div><div class="line"> mSpsPps = outData;</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (outData[<span class="number">0</span>] == <span class="number">0</span> && outData[<span class="number">1</span>] == <span class="number">0</span> && outData[<span class="number">2</span>] == <span class="number">0</span> </div><div class="line"> && outData[<span class="number">3</span>] == <span class="number">1</span> && outData[<span class="number">4</span>] == <span class="number">101</span>) {</div><div class="line"> <span class="comment">//关键帧开始规则是0x00 0x00 0x00 0x01 0x65，0x65对应十进制101</span></div><div class="line"> <span class="comment">//在关键帧前面加上pps和sps数据</span></div><div class="line"> <span class="keyword">byte</span>[] iframeData = <span class="keyword">new</span> <span class="keyword">byte</span>[mSpsPps.length + outData.length];</div><div class="line"> System.arraycopy(mSpsPps, <span class="number">0</span>, iframeData, <span class="number">0</span>, mSpsPps.length);</div><div class="line"> System.arraycopy(outData, <span class="number">0</span>, iframeData, mSpsPps.length, outData.length);</div><div class="line"> outData = iframeData;</div><div class="line"> }</div><div class="line"> <span class="comment">//至此，这一帧的数据已经经过MediaCodec编码完毕，这个outData就是我们需要的数据了，</span></div><div class="line"> <span class="comment">//因为EasyDarwin可以自动将H264打包为RTP，</span></div><div class="line"> <span class="comment">//所以EasyPusher只需要负责将outData推给EasyDarwin就OK了</span></div><div class="line"> <span class="comment">//保存H264数据到本地文件easy.h264</span></div><div class="line"> Util.save(outData, <span class="number">0</span>, outData.length, path, <span class="keyword">true</span>);</div><div class="line"> mMediaCodec.releaseOutputBuffer(outputBufferIndex, <span class="keyword">false</span>);</div><div class="line"> outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo, <span class="number">0</span>);</div><div class="line"> }</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> Log.e(<span class="string">"easypusher"</span>, <span class="string">"No buffer available !"</span>);</div><div class="line"> }</div><div class="line"> } <span class="keyword">catch</span> (Exception e) {</div><div class="line"> StringWriter sw = <span class="keyword">new</span> StringWriter();</div><div class="line"> PrintWriter pw = <span class="keyword">new</span> PrintWriter(sw);</div><div class="line"> e.printStackTrace(pw);</div><div class="line"> String stack = sw.toString();</div><div class="line"> Log.e(<span class="string">"save_log"</span>, stack);</div><div class="line"> e.printStackTrace();</div><div class="line"> } <span class="keyword">finally</span> {</div><div class="line"> mCamera.addCallbackBuffer(dst);</div><div class="line"> }</div><div class="line"> }</div><div class="line">};</div></pre></td></tr></table></figure>
<p>保存之后的文件easy.h264我用VLC播放器打开，截屏如下：<br></p>
<p><img src="http://img.blog.csdn.net/20160309132221153" alt="easy264截屏"></p>
<p><br>OK，基本上完毕了，该注意的地方都写在代码中了<br></p>
<p>需要Demo的请到这里<a href="https://github.com/kidloserme/MediaCodecDemo" target="_blank" rel="external">https://github.com/kidloserme/MediaCodecDemo</a></p>
]]></content>
<summary type="html">
<p>最近在研究EasyDarwin的Push库EasyPuhser，EasyPuhser可以推送H264视频到Easydarwin服务器，终端可以通过rtsp协议访问该实时流，达到手机直播的功能，延迟基本在2秒以内。<br>EasyDarwinQQ群：496258327<br>本文主要记录一下最近研究的关于Android手机如何获取实时画面，并将数据编码为H264的格式的视频流，编码使用的是Android自带的MediaCodec，也就是硬解。<br>本demo的下载地址：<a href="https://github.com/kidloserme/MediaCodecDemo">MediaCodecDemo</a></p>
</summary>
<category term="DEFAULT" scheme="http://yoursite.com/categories/DEFAULT/"/>
<category term="MediaCodec" scheme="http://yoursite.com/tags/MediaCodec/"/>
</entry>
<entry>
<title>EventBus源码阅读之事件的注册</title>
<link href="http://yoursite.com/2016/09/24/2016-03-17-EventBus/"/>
<id>http://yoursite.com/2016/09/24/2016-03-17-EventBus/</id>
<published>2016-09-23T16:56:16.000Z</published>
<updated>2016-09-24T08:09:41.000Z</updated>
<content type="html"><![CDATA[<p>之前看过EventBus的源码，不是很深入，导致有些模糊，此次仔细阅读了一下，记录笔记，方便以后熟悉。<br>本篇主要说一下register的过程：<br></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">register</span><span class="params">(Object subscriber, <span class="keyword">boolean</span> sticky, <span class="keyword">int</span> priority)</span> </span>{</div><div class="line"> <span class="comment">//查找subscriber（执行register的类）中注册事件的方法，onEvent开头，参数只允许一个，超过一个将被忽略</span></div><div class="line"> List<SubscriberMethod> subscriberMethods = subscriberMethodFinder.findSubscriberMethods(subscriber.getClass());</div><div class="line"> <span class="keyword">for</span> (SubscriberMethod subscriberMethod : subscriberMethods) {</div><div class="line"> <span class="comment">//根据事件类型以及订阅类进行数据处理</span></div><div class="line"> subscribe(subscriber, subscriberMethod, sticky, priority);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<a id="more"></a>
<p>findSubscriberMethods这个方法很长，大致要做的事情就是查找出该类以及其父类中声明的所有方法，根据规则（只能public修饰onEvent开头且只有一个参数）筛选出订阅方法，一起看一下吧，具体就在代码中写说明了，删除了部分代码限制篇幅：<br></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div></pre></td><td class="code"><pre><div class="line"><span class="function">List<SubscriberMethod> <span class="title">findSubscriberMethods</span><span class="params">(Class<?> subscriberClass)</span> </span>{</div><div class="line"> <span class="comment">//省略部分代码</span></div><div class="line"> subscriberMethods = <span class="keyword">new</span> ArrayList<SubscriberMethod>();</div><div class="line"> Class<?> clazz = subscriberClass;</div><div class="line"> HashSet<String> eventTypesFound = <span class="keyword">new</span> HashSet<String>();</div><div class="line"> StringBuilder methodKeyBuilder = <span class="keyword">new</span> StringBuilder();</div><div class="line"> <span class="keyword">while</span> (clazz != <span class="keyword">null</span>) {</div><div class="line"> String name = clazz.getName();</div><div class="line"> <span class="comment">//忽略系统类</span></div><div class="line"> <span class="keyword">if</span> (name.startsWith(<span class="string">"java."</span>) || name.startsWith(<span class="string">"javax."</span>) || name.startsWith(<span class="string">"android."</span>)) {</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> }</div><div class="line"> <span class="comment">//获取该类中声明的所有方法</span></div><div class="line"> Method[] methods = clazz.getDeclaredMethods();</div><div class="line"> <span class="keyword">for</span> (Method method : methods) {</div><div class="line"> String methodName = method.getName();</div><div class="line"> <span class="comment">//是否以onEvent开头</span></div><div class="line"> <span class="keyword">if</span> (methodName.startsWith(ON_EVENT_METHOD_NAME)) {</div><div class="line"> <span class="keyword">int</span> modifiers = method.getModifiers();</div><div class="line"> <span class="comment">//修饰符只能以public开头</span></div><div class="line"> <span class="keyword">if</span> ((modifiers & Modifier.PUBLIC) != <span class="number">0</span> && (modifiers & MODIFIERS_IGNORE) == <span class="number">0</span>) {</div><div class="line"> Class<?>[] parameterTypes = method.getParameterTypes();</div><div class="line"> <span class="comment">//只能有一个参数</span></div><div class="line"> <span class="keyword">if</span> (parameterTypes.length == <span class="number">1</span>) {</div><div class="line"> String modifierString = methodName.substring(ON_EVENT_METHOD_NAME.length());</div><div class="line"> ThreadMode threadMode;</div><div class="line"> <span class="comment">//获取线程执行方式</span></div><div class="line"> <span class="keyword">if</span> (modifierString.length() == <span class="number">0</span>) {</div><div class="line"> threadMode = ThreadMode.PostThread;</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (modifierString.equals(<span class="string">"MainThread"</span>)) {</div><div class="line"> threadMode = ThreadMode.MainThread;</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (modifierString.equals(<span class="string">"BackgroundThread"</span>)) {</div><div class="line"> threadMode = ThreadMode.BackgroundThread;</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (modifierString.equals(<span class="string">"Async"</span>)) {</div><div class="line"> threadMode = ThreadMode.Async;</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> <span class="comment">//省略部分代码</span></div><div class="line"> }</div><div class="line"> Class<?> eventType = parameterTypes[<span class="number">0</span>];</div><div class="line"> methodKeyBuilder.setLength(<span class="number">0</span>);</div><div class="line"> methodKeyBuilder.append(methodName).append(<span class="string">'>'</span>).append(eventType.getName());</div><div class="line"> String methodKey = methodKeyBuilder.toString();</div><div class="line"> <span class="comment">//检查是否已经添加过</span></div><div class="line"> <span class="keyword">if</span> (eventTypesFound.add(methodKey)) {</div><div class="line"> <span class="comment">// Only add if not already found in a sub class</span></div><div class="line"> <span class="comment">//添加到列表中</span></div><div class="line"> subscriberMethods.add(<span class="keyword">new</span> SubscriberMethod(method, threadMode, eventType));</div><div class="line"> }</div><div class="line"> }</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (!skipMethodVerificationForClasses.containsKey(clazz)) {</div><div class="line"> Log.d(EventBus.TAG, <span class="string">"Skipping method (not public, static or abstract): "</span> + clazz + <span class="string">"."</span></div><div class="line"> + methodName);</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }</div><div class="line"> <span class="comment">//获取父类并且继续查找父类中的订阅方法</span></div><div class="line"> clazz = clazz.getSuperclass();</div><div class="line"> }</div><div class="line"> <span class="comment">//省略部分代码</span></div><div class="line">}</div></pre></td></tr></table></figure>
<p>接下来看subscribe(subscriber, subscriberMethod, sticky, priority);这个方法是干啥的，总结来说就是把所有事件类型为eventType的订阅者放入List列表中，并放入Map集合中。然后再根据订阅事件的类构造一个订阅事件列表，用来判断某个类是否已经注册过事件,看一下代码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">subscribe</span><span class="params">(Object subscriber, SubscriberMethod subscriberMethod, <span class="keyword">boolean</span> sticky, <span class="keyword">int</span> priority)</span> </span>{</div><div class="line"> <span class="comment">//获取订阅事件中的时间类型</span></div><div class="line"> Class<?> eventType = subscriberMethod.eventType;</div><div class="line"> <span class="comment">//根据事件类型查找对应的所有订阅者（由类、方法、优先级组成）</span></div><div class="line"> CopyOnWriteArrayList<Subscription> subscriptions = subscriptionsByEventType.get(eventType);</div><div class="line"> <span class="comment">//创建一个新的订阅者</span></div><div class="line"> Subscription newSubscription = <span class="keyword">new</span> Subscription(subscriber, subscriberMethod, priority);</div><div class="line"> <span class="keyword">if</span> (subscriptions == <span class="keyword">null</span>) {</div><div class="line"> subscriptions = <span class="keyword">new</span> CopyOnWriteArrayList<Subscription>();</div><div class="line"> <span class="comment">//将订阅者列表放入Map中，后面post的时候会会根据这个eventType来获取该订阅者列表，然后来触发事件</span></div><div class="line"> subscriptionsByEventType.put(eventType, subscriptions);</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> <span class="comment">//不允许重复注册</span></div><div class="line"> <span class="keyword">if</span> (subscriptions.contains(newSubscription)) {</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> EventBusException(<span class="string">"Subscriber "</span> + subscriber.getClass() + <span class="string">" already registered to event "</span></div><div class="line"> + eventType);</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// Starting with EventBus 2.2 we enforced methods to be public (might change with annotations again)</span></div><div class="line"> <span class="comment">// subscriberMethod.method.setAccessible(true);</span></div><div class="line"> <span class="comment">//根据优先级将新的订阅者插入到已有的订阅者列表中</span></div><div class="line"> <span class="keyword">int</span> size = subscriptions.size();</div><div class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i <= size; i++) {</div><div class="line"> <span class="keyword">if</span> (i == size || newSubscription.priority > subscriptions.get(i).priority) {</div><div class="line"> subscriptions.add(i, newSubscription);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">//根据订阅类查找该订阅类中订阅事件类型，isRegister方法会用到此Map，判断是否已经注册过事件</span></div><div class="line"> List<Class<?>> subscribedEvents = typesBySubscriber.get(subscriber);</div><div class="line"> <span class="keyword">if</span> (subscribedEvents == <span class="keyword">null</span>) {</div><div class="line"> subscribedEvents = <span class="keyword">new</span> ArrayList<Class<?>>();</div><div class="line"> typesBySubscriber.put(subscriber, subscribedEvents);</div><div class="line"> }</div><div class="line"> subscribedEvents.add(eventType);</div><div class="line"></div><div class="line"> <span class="comment">//粘性事件</span></div><div class="line"> <span class="keyword">if</span> (sticky) {</div><div class="line"> <span class="comment">//指定粘性事件是否只触发订阅了当前事件类型的子类的订阅者</span></div><div class="line"> <span class="keyword">if</span> (eventInheritance) {</div><div class="line"> <span class="comment">//stickyEvents中key为事件类名，value为事件类的实例</span></div><div class="line"> Set<Map.Entry<Class<?>, Object>> entries = stickyEvents.entrySet();</div><div class="line"> <span class="keyword">for</span> (Map.Entry<Class<?>, Object> entry : entries) {</div><div class="line"> Class<?> candidateEventType = entry.getKey();</div><div class="line"> <span class="comment">//eventType类是否是candidateEventType类的父类</span></div><div class="line"> <span class="keyword">if</span> (eventType.isAssignableFrom(candidateEventType)) {</div><div class="line"> Object stickyEvent = entry.getValue();</div><div class="line"> <span class="comment">//触发事件</span></div><div class="line"> checkPostStickyEventToSubscription(newSubscription, stickyEvent);</div><div class="line"> }</div><div class="line"> }</div><div class="line"> } <span class="keyword">else</span> {</div><div class="line"> <span class="comment">//获取所有黏性事件并触发</span></div><div class="line"> Object stickyEvent = stickyEvents.get(eventType);</div><div class="line"> checkPostStickyEventToSubscription(newSubscription, stickyEvent);</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>post有两种，一种是在UI线程中，一种是子线程中执行，需要注意的是如果你post的事件类型为A，那么所有订阅过A的超类的事件也同样会被触发，时间原因，源码不分析，后续有时间接着写，记此笔记，方便自己查阅！</p>
]]></content>
<summary type="html">
<p>之前看过EventBus的源码，不是很深入，导致有些模糊，此次仔细阅读了一下，记录笔记，方便以后熟悉。<br>本篇主要说一下register的过程：<br></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">register</span><span class="params">(Object subscriber, <span class="keyword">boolean</span> sticky, <span class="keyword">int</span> priority)</span> </span>&#123;</div><div class="line"> <span class="comment">//查找subscriber（执行register的类）中注册事件的方法，onEvent开头，参数只允许一个，超过一个将被忽略</span></div><div class="line"> List&lt;SubscriberMethod&gt; subscriberMethods = subscriberMethodFinder.findSubscriberMethods(subscriber.getClass());</div><div class="line"> <span class="keyword">for</span> (SubscriberMethod subscriberMethod : subscriberMethods) &#123;</div><div class="line"> <span class="comment">//根据事件类型以及订阅类进行数据处理</span></div><div class="line"> subscribe(subscriber, subscriberMethod, sticky, priority);</div><div class="line"> &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
</summary>
<category term="DEFAULT" scheme="http://yoursite.com/categories/DEFAULT/"/>
<category term="EventBus" scheme="http://yoursite.com/tags/EventBus/"/>
</entry>
<entry>
<title>知识点总结</title>
<link href="http://yoursite.com/2016/09/24/2016-03-17-Points/"/>
<id>http://yoursite.com/2016/09/24/2016-03-17-Points/</id>
<published>2016-09-23T16:56:16.000Z</published>
<updated>2016-09-24T08:09:51.000Z</updated>
<content type="html"><![CDATA[<h3 id="HaspMap原理"><a href="#HaspMap原理" class="headerlink" title="HaspMap原理"></a>HaspMap原理</h3><p>根据key的hashCode与Enty[]长度取模获取index来决定放入Enty中的位置，index重复则使用Entry.next在同一个index中放入多个值<br>具体可看：<a href="http://www.cnblogs.com/xwdreamer/archive/2012/05/14/2499339.html" target="_blank" rel="external">http://www.cnblogs.com/xwdreamer/archive/2012/05/14/2499339.html</a> 介绍</p>
<h3 id="HashMap和HashTable的区别"><a href="#HashMap和HashTable的区别" class="headerlink" title="HashMap和HashTable的区别"></a>HashMap和HashTable的区别</h3><p>HaspMap继承AbstractMap ，HashTable继承Dictionary<br>HashMap的方法不是同步的，HashTable的方法是同步的<br>HashMap允许key和value为Null，HashTable不允许key和value为null<br>详见：<a href="http://blog.csdn.net/shohokuf/article/details/3932967" target="_blank" rel="external">http://blog.csdn.net/shohokuf/article/details/3932967</a></p>
<a id="more"></a>
<h3 id="HashMap-TreeMap-LinkedHashMap-元素顺序"><a href="#HashMap-TreeMap-LinkedHashMap-元素顺序" class="headerlink" title="HashMap TreeMap LinkedHashMap 元素顺序"></a>HashMap TreeMap LinkedHashMap 元素顺序</h3><p>HashMap不保证元素的插入顺序，TreeMap默认会按照key的升序排序TreeMap支持自定义排序，LinkedHashMap按照插入顺序排序</p>
<h3 id="List子类ArrayList-LinkedList-Vector"><a href="#List子类ArrayList-LinkedList-Vector" class="headerlink" title="List子类ArrayList LinkedList Vector"></a>List子类ArrayList LinkedList Vector</h3><p>LinkedList在 add和remove 上更快,而在get上更慢.<br>List接口下一共实现了三个类：ArrayList，Vector，LinkedList。LinkedList就不多说了，它一般主要用在保持数据的插入顺序的时候。<br>ArrayList和Vector都是用数组实现的，主要有这么三个区别：</p>
<ul>
<li>1、Vector是多线程安全的，而ArrayList不是，这个可以从源码中看出，Vector类中的方法很多有synchronized进行修饰，这样就导致了Vector在效率上无法与ArrayList相比；</li>
<li>2、两个都是采用的线性连续空间存储元素，但是当空间不足的时候，两个类的增加方式是不同的，很多网友说Vector增加原来空间的一倍，ArrayList增加原来空间的50%，其实也差不多是这个意思，不过还有一点点问题可以从源码中看出，一会儿从源码中分析。</li>
<li>3、Vector可以设置增长因子，而ArrayList不可以，最开始看这个的时候，我没理解什么是增量因子，不过通过对比一下两个源码理解了这个，先看看两个类的构造方法：</li>
</ul>
<h3 id="HashSet"><a href="#HashSet" class="headerlink" title="HashSet"></a>HashSet</h3><p>HashSet内部实际上是一个HashMap，看代码</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">transient</span> HashMap<E, HashSet<E>> backingMap;</div><div class="line">看添加代码：</div><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">add</span><span class="params">(E object)</span> </span>{</div><div class="line"> <span class="keyword">return</span> backingMap.put(object, <span class="keyword">this</span>) == <span class="keyword">null</span>;</div><div class="line">}</div><div class="line"><span class="comment">//所以Set几何不允许重复的元素存在</span></div></pre></td></tr></table></figure>
<h3 id="Map-List-Set"><a href="#Map-List-Set" class="headerlink" title="Map List Set"></a>Map List Set</h3><ul>
<li>Map内部是一个Entry数组；</li>
<li>List内部是一个Object数组；</li>
<li>Set内部是一个Map集合，map的key集合就是Set的Value集合</li>
</ul>
<h3 id="关键字transient："><a href="#关键字transient：" class="headerlink" title="关键字transient："></a>关键字transient：</h3><ul>
<li>1）一旦变量被transient修饰，变量将不再是对象持久化的一部分，该变量内容在序列化后无法获得访问。</li>
<li>2）transient关键字只能修饰变量，而不能修饰方法和类。注意，本地变量是不能被transient关键字修饰的。变量如果是用户自定义类变量，则该类需要实现Serializable接口。</li>
<li>3）被transient关键字修饰的变量不再能被序列化，一个静态变量不管是否被transient修饰，均不能被序列化。</li>
</ul>
<h3 id="一个关于线程的问题"><a href="#一个关于线程的问题" class="headerlink" title="一个关于线程的问题"></a>一个关于线程的问题</h3><p>假如有Thread1、Thread2、Thread3、Thread4四条线程分别统计C、D、E、F四个盘的大小，所有线程都统计完毕交给Thread5线程去做汇总，应当如何实现？<br>可以使用并发包下的CountDownLatch实现<br><a href="http://www.cnblogs.com/dolphin0520/p/3920397.html" target="_blank" rel="external">http://www.cnblogs.com/dolphin0520/p/3920397.html</a></p>
<h3 id="wait和notify："><a href="#wait和notify：" class="headerlink" title="wait和notify："></a>wait和notify：</h3><p>执行wait、notify必须在同步块内部，这两个动作都是针对某一个对象的，比如对象A在线程1中执行了wait，那么线程1就会停留在此处，类似于阻塞，然后A在线程2中调用了notify，并且线程2执行结束之后线程1继续执行，如果对象A不在某处调用notify，线程1会一直停留在wait那一行处不继续执行。或者A调用wait的时候传一个等待时间，如果在这个等待时间内notify没有被调用，线程1会恢复执行。如果对象A在多个线程调用wait，那么必须执行notifyAll才能唤醒所有等待的线程，否则只会喊醒其中一个。</p>
<h3 id="线程通信"><a href="#线程通信" class="headerlink" title="线程通信"></a>线程通信</h3><p>线程之间的通信机制:(共享内存、消息传递)<br>深入理解Java内存模型<a href="http://www.infoq.com/cn/articles/java-memory-model-1" target="_blank" rel="external">http://www.infoq.com/cn/articles/java-memory-model-1</a></p>
<h3 id="Volatile的官方定义"><a href="#Volatile的官方定义" class="headerlink" title="Volatile的官方定义"></a>Volatile的官方定义</h3><p>Java语言规范第三版中对volatile的定义如下： java编程语言允许线程访问共享变量，为了确保共享变量能被准确和一致的更新，线程应该确保通过排他锁单独获得这个变量。Java语言提供了volatile，在某些情况下比锁更加方便。如果一个字段被声明成volatile，java线程内存模型确保所有线程看到这个变量的值是一致的</p>
<h3 id="线程池"><a href="#线程池" class="headerlink" title="线程池"></a>线程池</h3><p>为什么要使用线程池<br>避免频繁地创建和销毁线程，达到线程对象的重用。另外，使用线程池还可以根据项目灵活地控制并发的数目。<br>从Java5开始，Java提供了自己的线程池。每次只执行指定数量的线程，java.util.concurrent.ThreadPoolExecutor<br>public ThreadPoolExecutor(int corePoolSize,int maximumPoolSize,long keepAliveTime,TimeUnit unit,BlockingQueue<runnable> workQueue,RejectedExecutionHandler handler); </runnable></p>
<h4 id="参数介绍："><a href="#参数介绍：" class="headerlink" title="参数介绍："></a>参数介绍：</h4><ul>
<li>corePoolSize 核心线程数，指保留的线程池大小（不超过maximumPoolSize值时，线程池中最多有corePoolSize 个线程工作）。 </li>
<li>maximumPoolSize 指的是线程池的最大大小（线程池中最大有corePoolSize 个线程可运行）。 </li>
<li>keepAliveTime 指的是空闲线程结束的超时时间（当一个线程不工作时，过keepAliveTime 长时间将停止该线程）。 </li>
<li>unit 是一个枚举，表示 keepAliveTime 的单位（有NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS，7个可选值）。 </li>
<li>workQueue 表示存放任务的队列（存放需要被线程池执行的线程队列）。 </li>
<li>handler 拒绝策略（添加任务失败后如何处理该任务）</li>
</ul>
<h4 id="要点："><a href="#要点：" class="headerlink" title="要点："></a>要点：</h4><ul>
<li>1、线程池刚创建时，里面没有一个线程。任务队列是作为参数传进来的。不过，就算队列里面有任务，线程池也不会马上执行它们。</li>
<li>2、当调用 execute() 方法添加一个任务时，线程池会做如下判断：<ul>
<li>a. 如果正在运行的线程数量小于 corePoolSize，那么马上创建线程运行这个任务；</li>
<li>b. 如果正在运行的线程数量大于或等于 corePoolSize，那么将这个任务放入队列。</li>
<li>c. 如果这时候队列满了，而且正在运行的线程数量小于 maximumPoolSize，那么还是要创建线程运行这个任务；</li>
<li>d. 如果队列满了，而且正在运行的线程数量大于或等于 maximumPoolSize，那么线程池会抛出异常，告诉调用者“我不能再接受任务了”。</li>
</ul>
</li>
<li>3、当一个线程完成任务时，它会从队列中取下一个任务来执行。</li>
<li>4、当一个线程无事可做，超过一定的时间（keepAliveTime）时，线程池会判断，如果当前运行的线程数大于corePoolSize，那么这个线程就被停掉。所以线程池的所有任务完成后，它最终会收缩到 corePoolSize 的大小。</li>
</ul>
<p>这个过程说明，并不是先加入任务就一定会先执行。假设队列大小为4，corePoolSize为2，maximumPoolSize为6，那么当加入15个任务时，执行的顺序类似这样：首先执行任务 1、2，然后任务3~6被放入队列。这时候队列满了，任务7、8、9、10 会被马上执行，而任务 11~15则会抛出异常。最终顺序是：1、2、7、8、9、10、3、4、5、6。当然这个过程是针对指定大小的ArrayBlockingQueue<runnable>来说，如果是LinkedBlockingQueue<runnable>，因为该队列无大小限制，所以不存在上述问题。</runnable></runnable></p>
<h4 id="线程池创建"><a href="#线程池创建" class="headerlink" title="线程池创建"></a>线程池创建</h4><p>Executors.newCachedThreadPool(); //创建一个缓冲池，缓冲池容量大小为Integer.MAX_VALUE<br><br>Executors.newSingleThreadExecutor(); //创建容量为1的缓冲池<br><br>Executors.newFixedThreadPool(int); //创建固定容量大小的缓冲池<br></p>
]]></content>
<summary type="html">
<h3 id="HaspMap原理"><a href="#HaspMap原理" class="headerlink" title="HaspMap原理"></a>HaspMap原理</h3><p>根据key的hashCode与Enty[]长度取模获取index来决定放入Enty中的位置，index重复则使用Entry.next在同一个index中放入多个值<br>具体可看：<a href="http://www.cnblogs.com/xwdreamer/archive/2012/05/14/2499339.html">http://www.cnblogs.com/xwdreamer/archive/2012/05/14/2499339.html</a> 介绍</p>
<h3 id="HashMap和HashTable的区别"><a href="#HashMap和HashTable的区别" class="headerlink" title="HashMap和HashTable的区别"></a>HashMap和HashTable的区别</h3><p>HaspMap继承AbstractMap ，HashTable继承Dictionary<br>HashMap的方法不是同步的，HashTable的方法是同步的<br>HashMap允许key和value为Null，HashTable不允许key和value为null<br>详见：<a href="http://blog.csdn.net/shohokuf/article/details/3932967">http://blog.csdn.net/shohokuf/article/details/3932967</a></p>
</summary>
<category term="DEFAULT" scheme="http://yoursite.com/categories/DEFAULT/"/>
</entry>
<entry>
<title>Hello World</title>
<link href="http://yoursite.com/2016/09/24/hello-world/"/>
<id>http://yoursite.com/2016/09/24/hello-world/</id>
<published>2016-09-23T16:35:54.000Z</published>
<updated>2016-09-24T08:12:24.000Z</updated>
<content type="html"><![CDATA[<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="external">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="external">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="external">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="external">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo new <span class="string">"My New Post"</span></div></pre></td></tr></table></figure>
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<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="external">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo server</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="external">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo generate</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="external">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo deploy</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="external">Deployment</a></p>
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Hello World ，第一篇测试文章
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