diff --git a/README.md b/README.md
index 2c236c0..b0dc18c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 ## Downloader
-Downloader 是一个非常轻巧以及功能强大快速下载库，只有50KB 左右大小，对于大多数应用来说，性价比最高的一个下载库， 相比系统提供DownloadManager、FileDownloader 来说，Downloader 提供的API更简单、轻量且Downloader提供同步下载，系统通知进度等功能。
+Downloader 是一个非常轻巧以及功能强大快速下载库，只有50KB 左右大小，对于大多数应用来说，性价比最高的一个下载库， Downloader 提供的API更简单、轻量且Downloader提供同步下载，系统通知进度等功能。
 
 ## 预览图
 
@@ -33,31 +33,30 @@ allprojects {
 ```
 
 ```
- implementation 'com.github.Justson:Downloader:v4.1.9' 
+ implementation 'com.github.Justson:Downloader:v4.2.0' 
+or
+ implementation 'com.github.Justson:Downloader:v4.2.0-androidx'
 ```
 
 ## 例子
 
 #### 同步
 ```java
-File file = DownloadImpl.getInstance()
-				.with(getApplicationContext())
+File file = DownloadImpl.getInstance(getApplicationContext())
 				.url("http://shouji.360tpcdn.com/170918/93d1695d87df5a0c0002058afc0361f1/com.ss.android.article.news_636.apk")
 				.get();
 ```
 
 #### 异步
 ```java
-DownloadImpl.getInstance()
-                .with(getApplicationContext())
+DownloadImpl.getInstance(getApplicationContext())
                 .url("http://shouji.360tpcdn.com/170918/f7aa8587561e4031553316ada312ab38/com.tencent.qqlive_13049.apk")
                 .enqueue();
 ```
 
 #### 进度监听
 ```java
-DownloadImpl.getInstance()
-		.with(getApplicationContext())
+DownloadImpl.getInstance(getApplicationContext())
 		.target(new File(this.getExternalCacheDir(), "com.ss.android.article.news_636.apk"))
 		.setUniquePath(false)
 		.setForceDownload(true)
diff --git a/library/build.gradle b/library/build.gradle
index f21d0d6..c1e781f 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -7,7 +7,7 @@ android {
         minSdkVersion 14
         targetSdkVersion TARGET_SDK_VERSION.toInteger()
         versionCode 2
-        versionName "4.1.9"
+        versionName "4.2.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
     }
diff --git a/library/src/main/AndroidManifest.xml b/library/src/main/AndroidManifest.xml
index ded4cbf..ed98158 100644
--- a/library/src/main/AndroidManifest.xml
+++ b/library/src/main/AndroidManifest.xml
@@ -8,10 +8,7 @@
     </uses-permission>
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE">
     </uses-permission>
-    <application
-        android:allowBackup="true"
-        android:supportsRtl="true"
-        >
+    <application>
         <provider
             android:name="com.download.library.DownloadFileProvider"
             android:authorities="${applicationId}.DownloadFileProvider"