Android_menu_optionMenu

xml文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.menudemo.OptionMenuDemo" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

源代码：

package com.example.menudemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
/**
 * 选项菜单：optionMenu
 *
 * 创建选项菜单：重写onCreateMenu()
 * |--设置菜单项
 *         可用代码动态设置menu.add()
 *         还可通过xml设置MenuInflater.inflate()
 * |--设置菜单项点击事件：onOptionsItemSelected()
 * @author Administrator
 *
 */
public class OptionMenuDemo 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.

        //通过xml加载布局文件的形式创建菜单
        //getMenuInflater().inflate(R.menu.main, menu);

        MenuItem item = menu.add(1, 1, 1, "menu1");
        item.setTitle("高级 menu");
        item.setIcon(R.drawable.ic_launcher);//api>=11不显示图标
        menu.add(1, 2, 1, "menu2");
        menu.add(1, 3, 1, "menu3");
        menu.add(1, 4, 1, "menu4");
        menu.add(1, 5, 1, "menu5");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()){
        /*case R.id.menu1:
            Toast.makeText(this, "clicked menu1", Toast.LENGTH_SHORT).show();
            break;
        case R.id.menu2:
            Toast.makeText(this, "clicked menu2", Toast.LENGTH_SHORT).show();
            break;*/
        case 1:{
            //点击菜单1跳转到第二个页面
            Intent intent = new Intent(this,SecondActivity.class);
            item.setIntent(intent);
            Toast.makeText(this, "clicked menu1", Toast.LENGTH_SHORT).show();
            break;
        }
        case 2:
            Toast.makeText(this, "clicked menu2", Toast.LENGTH_SHORT).show();
            break;
        case 3:
            Toast.makeText(this, "clicked menu3", Toast.LENGTH_SHORT).show();
            break;
        case 4:
            Toast.makeText(this, "clicked menu4", Toast.LENGTH_SHORT).show();
            break;
        case 5:
            Toast.makeText(this, "clicked menu5", Toast.LENGTH_SHORT).show();
            break;
        }
        return super.onOptionsItemSelected(item);
    }
}