增加diffUtil的demo

adapter/src/main/java/kale/adapter/CommonRcvAdapter.java

@@ -161,6 +161,7 @@ static class RcvAdapterItem extends RecyclerView.ViewHolder {
             this.item.bindViews(itemView);
             this.item.setViews();
         }
+
     }
 
     ///////////////////////////////////////////////////////////////////////////

app/src/main/AndroidManifest.xml

@@ -20,6 +20,7 @@
         <activity android:name=".ListViewActivity" />
         <activity android:name=".RecyclerViewActivity" />
         <activity android:name=".HeaderFooterActivity" />
+        <activity android:name=".DiffRcvActivity" />
     </application>
 
 </manifest>

app/src/main/java/kale/commonadapter/DiffRcvActivity.java

@@ -0,0 +1,104 @@
+package kale.commonadapter;
+
+import java.util.List;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.util.DiffUtil;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.Log;
+
+import kale.adapter.CommonRcvAdapter;
+import kale.adapter.item.AdapterItem;
+import kale.commonadapter.item.TextItem;
+import kale.commonadapter.model.DemoModel;
+import kale.commonadapter.util.DataManager;
+import kale.commonadapter.util.LayoutUtil;
+
+/**
+ * @author Kale
+ * @date 2017/2/8
+ */
+public class DiffRcvActivity extends AppCompatActivity {
+
+    private static final String TAG = "DiffRcvActivity";
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        RecyclerView recyclerView = new RecyclerView(this);
+        LayoutUtil.setContentView(this, recyclerView);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
+        final DiffRcvAdapter<DemoModel> adapter = new DiffRcvAdapter<DemoModel>(DataManager.loadData(this, 3)) {
+            @NonNull
+            @Override
+            public AdapterItem createItem(Object type) {
+                return new TextItem();
+            }
+
+            @Override
+            protected boolean isContentSame(DemoModel oldItemData, DemoModel newItemData) {
+                return oldItemData.content.equals(newItemData.content);
+            }
+        };
+
+        recyclerView.setAdapter(adapter);
+
+        recyclerView.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                adapter.setData(DataManager.loadData(DiffRcvActivity.this, 3));
+            }
+        }, 1000);
+    }
+
+    public static abstract class DiffRcvAdapter<T> extends CommonRcvAdapter<T> {
+
+        DiffRcvAdapter(@Nullable List<T> data) {
+            super(data);
+        }
+
+        @Override
+        public void setData(@NonNull final List<T> data) {
+            DiffUtil.calculateDiff(new DiffUtil.Callback() {
+                @Override
+                public int getOldListSize() {
+                    return getItemCount();
+                }
+
+                @Override
+                public int getNewListSize() {
+                    return data.size();
+                }
+
+                /**
+                 * 检测是否是相同的item，这里暂时通过位置判断
+                 */
+                @Override
+                public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+                    boolean result = oldItemPosition == newItemPosition;
+                    Log.d(TAG, "areItemsTheSame: " + result);
+                    return result;
+                }
+
+                /**
+                 * 检测是否是相同的数据
+                 * 这个方法仅仅在areItemsTheSame()返回true时，才调用。
+                 */
+                @Override
+                public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+                    boolean result = isContentSame(getData().get(oldItemPosition), data.get(newItemPosition));
+                    Log.d(TAG, "areContentsTheSame: " + result);
+                    return result;
+                }
+            }).dispatchUpdatesTo(this);
+            super.setData(data);
+
+        }
+
+        protected abstract boolean isContentSame(T oldItemData, T newItemData);
+    }
+
+}

app/src/main/java/kale/commonadapter/MainActivity.java

@@ -17,6 +17,7 @@ protected void onCreate(Bundle savedInstanceState) {
         findViewById(R.id.rcv_btn).setOnClickListener(this);
         findViewById(R.id.rcv_btn2).setOnClickListener(this);
         findViewById(R.id.viewpager_btn).setOnClickListener(this);
+        findViewById(R.id.diff_btn).setOnClickListener(this);
     }
 
     @Override
@@ -35,6 +36,9 @@ public void onClick(View v) {
             case R.id.viewpager_btn:
                 clz = ViewPagerActivity.class;
                 break;
+            case R.id.diff_btn:
+                clz = DiffRcvActivity.class;
+                break;
         }
         startActivity(new Intent(this, clz));
     }

app/src/main/java/kale/commonadapter/item/TextItem.java

@@ -14,8 +14,6 @@
  */
 public class TextItem implements AdapterItem<DemoModel> {
 
-    private static final String TAG = "TextItem";
-
     @Override
     public int getLayoutResId() {
         return R.layout.demo_item_text;

app/src/main/res/layout/main_activity.xml

@@ -10,7 +10,7 @@
         android:id="@+id/list_view_btn"
         android:layout_width="match_parent"
         android:layout_height="60dp"
-        android:layout_marginTop="100dp"
+        android:layout_marginTop="40dp"
         android:text="ListView"
         />
 
@@ -39,4 +39,12 @@
         android:text="viewpager"
         />
 
+    <Button
+        android:id="@+id/diff_btn"
+        android:layout_width="match_parent"
+        android:layout_height="60dp"
+        android:layout_marginTop="26dp"
+        android:text="diffUtil"
+        />
+
 </LinearLayout>