android中的menu和子menu小结

menu.xml 


<?xml version="1.0" encoding="utf-8"?> 

<menu 

  xmlns:android="http://schemas.android.com/apk/res/android"> 

  <item android:id="@+id/Menu1" 

 android:title="Menu 1" 

 android:orderInCategory="1" /> 

 <item android:id="@+id/Menu2" 

 android:orderInCategory="2" 

 android:title="Menu 2" /> 

 <item android:id="@+id/Menu3" 

 android:orderInCategory="3" 

 android:title="Menu 3" /> 

 <item android:id="@+id/submenu" 

     android:title="Sub menu" 

     android:orderInCategory="4"> 

     <menu> 

         <item android:id="@+id/submenu1" 

         android:title="Sub menu 1" /> 

         <item android:id="@+id/submenu2" 

         android:title="Sub menu 2" /> 

     </menu> 

   </item> 

</menu> 

public class MenuActivity extends Activity { 

    /** Called when the activity is first created. */ 

 @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

    } 

 public boolean onCreateOptionsMenu(Menu menu) { 

 new MenuInflater(getApplication()) 

 .inflate(R.menu.menu, menu); 

 return(super.onPrepareOptionsMenu(menu)); 

 } 


 public boolean onOptionsItemSelected(MenuItem item) { 

 switch (item.getItemId()) { 

         case R.id.Menu1: 

         Toast.makeText(this, "Menu 1", Toast.LENGTH_SHORT).show(); 

         break; 

         case R.id.Menu2: 

         Toast.makeText(this, "Menu 2", Toast.LENGTH_SHORT).show(); 

         break; 

         case R.id.Menu3: 

         Toast.makeText(this, "Menu 3", Toast.LENGTH_SHORT).show(); 

         break; 

         case R.id.submenu: 

         Toast.makeText(this, "Sub menu", Toast.LENGTH_SHORT).show(); 

         break; 

     } 

 return(super.onOptionsItemSelected(item)); 

 } 

}