Android学习笔记之Menu的ShowAsAction属性的设置

（1）在res--menu目录下的main.xml文件

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<menu xmlns:android="http://schemas.android.com/apk/res/android">       <item android:id="@+id/file" android:orderincategory="100" android:showasaction="always" android:title="文件(F)">         <menu>             <item android:id="@+id/create" android:title="新建">             </item>             <item android:id="@+id/open" android:title="打开">             </item>         </menu>     </item>     <item android:id="@+id/edit" android:orderincategory="100" android:showasaction="always" android:title="编辑(E)">         <menu>             <item android:id="@+id/create1" android:title="新建">             </item>             <item android:id="@+id/open1" android:title="打开">             </item>         </menu>     </item>     <item android:id="@+id/format" android:orderincategory="100" android:showasaction="always" android:title="格式(O)">         <menu>             <item android:id="@+id/create2" android:title="新建">             </item>             <item android:id="@+id/open2" android:title="打开">             </item>         </menu>     </item>   </menu>

（2）类的文件

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package com.example.menu_showasaction;   import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.MenuItem; import android.widget.Toast;   public class MainActivity extends Activity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);     }       @Override     public boolean onCreateOptionsMenu(Menu menu) {         // Inflate the menu; this adds items to the action bar if it is present.         getMenuInflater().inflate(R.menu.main, menu);         return true;     }       @Override     public boolean onMenuItemSelected(int featureId, MenuItem item) {         switch (item.getItemId()) {         case R.id.create:             Toast.makeText(MainActivity.this, "create...", Toast.LENGTH_SHORT);             break;           default:             break;         }         return super.onMenuItemSelected(featureId, item);     }   }

 

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