android编程2:menu按键功能实现

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

android应用程序可以通过menu按键弹出菜单,现在通过menu按键弹出一个拥有两个选项的菜单.点击第一个按键,文本框会显示"第1个按键",点击第二个按键,文本框会显示"第2个按键"

package com.test_menu;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.*;
import android.widget.*;;

public class test_menu extends Activity {
	public static final int ITEM0 = Menu.FIRST;
	public static final int ITEM1 = Menu.FIRST + 1;
	private TextView text;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        text = (TextView)findViewById(R.id.textView1);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
    	super.onCreateOptionsMenu(menu);
    	menu.add(0,ITEM0,0,"button1");
    	menu.add(0,ITEM1,0,"button2");
    	menu.findItem(ITEM1);
    	return true;
    }
    
    public boolean onOptionsItemSelected(MenuItem item)
    {
    	switch (item.getItemId())
    	{
    	case ITEM0:
	    	{
	    		text.setText("第1个按键");
	    		break;
	    	}
    	case ITEM1:
	    	{
	    		text.setText("第2个按键");
	    		break;
	    	}
    	}
    	return super.onOptionsItemSelected(item);
    }
}

运行效果图: