處理動作欄(Action Bar)的用戶選項操作, onOptionsItemSelected()

重寫onOptionsItemSelected(MenuItem item)方法, 我們可以處理用戶的動作欄(Action Bar)選項.

package com.Android3ActionBar;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class Android3ActionBarActivity extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {

  getMenuInflater().inflate(R.menu.menu, menu);
      return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
  switch(item.getItemId()){
  case R.id.itemid_0:
  case R.id.itemid_1:
  case R.id.itemid_2:
  case R.id.itemid_3:
  case R.id.itemid_4:
  case R.id.itemid_5:
   Toast.makeText(Android3ActionBarActivity.this,
     item.getTitle(),
     Toast.LENGTH_LONG).show();
   return true;
  default:
   return false;
  }
  
 } 
}

<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/itemid_0"
      android:title="Done"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_done"
      android:showAsAction="ifRoom|withText" />
  <item android:id="@+id/itemid_1"
      android:title="Photo"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_photo"
      android:showAsAction="ifRoom|withText" />
  <item android:id="@+id/itemid_2"
      android:title="Refresh"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_refresh"
      android:showAsAction="ifRoom|withText" />
  <item android:id="@+id/itemid_3"
      android:title="Star"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_star"
      android:showAsAction="ifRoom|withText" />
  <item android:id="@+id/itemid_4"
      android:title="User"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_user"
      android:showAsAction="ifRoom|withText" />
  <item android:id="@+id/itemid_5"
      android:title="Add User"
      android:orderInCategory="0"
      android:icon="@drawable/ic_action_user_add"
      android:showAsAction="ifRoom|withText" />
</menu>