Android抽象布局——include、merge 、ViewStub详解

<include />标签能够重用布局文件，简单的使用如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" 
 android:layout_width=”match_parent” 
 android:layout_height=”match_parent” 
 android:background="@color/app_bg" 
 android:gravity="center_horizontal"> 
 
 <include layout="@layout/titlebar"/> 
 
 <TextView android:layout_width=”match_parent” 
    android:layout_height="wrap_content" 
    android:text="@string/hello" 
    android:padding="10dp" /> 
 
 ... 
 
</LinearLayout> 

View bookmarks_container_2 = findViewById(R.id.bookmarks_favourite); 
 
bookmarks_container_2.findViewById(R.id.bookmarks_list); 

 <merge xmlns:android="http://schemas.android.com/apk/res/android"> 
 
 <Button 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="@string/add"/> 
 
 <Button 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="@string/delete"/> 
 
</merge> 

<ViewStub 
 android:id="@+id/stub_import" 
 android:inflatedId="@+id/panel_import" 
 android:layout="@layout/progress_overlay" 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content" 
 android:layout_gravity="bottom" /> 

((ViewStub) findViewById(R.id.stub_import)).setVisibility(View.VISIBLE); 
// or 
View importPanel = ((ViewStub) findViewById(R.id.stub_import)).inflate();