向Action Bar添加动作项

作者：追风剑情发布于：2015-7-25 22:18 分类：Android

除了在Action Bar的左侧显示应用程序图标和活动名称以外，还可以在Action Bar上显示其他项，这些项叫做动作项。动作项是应用程序中经常执行的一些操作的快捷方式。

package com.example.androidtest;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
 
public class MyActionBarActivity extends Activity {
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_my_action_bar);
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		CreateMenu(menu);
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item){
		return MenuChoice(item);
	}
	
	private void CreateMenu(Menu menu){
		MenuItem menu1 = menu.add(0, 0, 0, "Item 1");
		{
			menu1.setIcon(R.drawable.ic_launcher);
			//SHOW_AS_ACTION_IF_ROOM: 如果Action Bar上有空间，
			//则将该菜单项显示为一个动作项
			menu1.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		}
		MenuItem menu2 = menu.add(0, 1, 1, "Item 2");
		{
			menu2.setIcon(R.drawable.ic_launcher);
			menu2.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		}
		MenuItem menu3 = menu.add(0, 2, 2, "Item 3");
		{
			menu3.setIcon(R.drawable.ic_launcher);
			menu3.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		}
		MenuItem menu4 = menu.add(0, 3, 3, "Item 4");
		{
			menu4.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		}
		MenuItem menu5 = menu.add(0, 4, 4, "Item 5");
		{
			menu5.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		}
	}
	
	private boolean MenuChoice(MenuItem item){
		switch(item.getItemId()){
		case 0:
			Toast.makeText(this, "You clicked on Item 1", Toast.LENGTH_LONG).show();
			return true;
		case 1:
			Toast.makeText(this, "You clicked on Item 2", Toast.LENGTH_LONG).show();
			return true;
		case 2:
			Toast.makeText(this, "You clicked on Item 3", Toast.LENGTH_LONG).show();
			return true;
		case 3:
			Toast.makeText(this, "You clicked on Item 4", Toast.LENGTH_LONG).show();
			return true;
		case 4:
			Toast.makeText(this, "You clicked on Item 5", Toast.LENGTH_LONG).show();
			return true;
		}
		return false;
	}
}