Android_menu_SubMenu

<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.SubMenuDemo" >

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

</RelativeLayout>

package com.example.menudemo;

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

public class SubMenuDemo extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_submenu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        /**用xml文件加载菜单栏
         * getMenuInflater().inflate(R.menu.sub_menu_demo, menu);
         */
        //添加子菜单
        SubMenu file = menu.addSubMenu("文件");
        file.add(1, 1, 1, "新建");
        file.add(1, 2, 1, "打开");
        file.add(1, 3, 1, "保存");
        file.setHeaderIcon(R.drawable.ic_launcher);
        file.setHeaderTitle("文件操作");
        
        SubMenu edit = menu.addSubMenu("编辑");
        edit.add(2,1,1,"复制");
        edit.add(2,2,1,"粘贴");
        edit.add(2,3,1,"剪切");
        edit.setHeaderIcon(R.drawable.ic_launcher);
        edit.setHeaderTitle("编辑操作");
        return true;   
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        switch(item.getGroupId()){
        case 1:{
            if(item.getItemId()==1){
                Toast.makeText(this,"点击了新建" , Toast.LENGTH_SHORT).show();
            }else if(item.getItemId()==2){
                Toast.makeText(this,"点击了打开" , Toast.LENGTH_SHORT).show();
            }if(item.getItemId()==3){
                Toast.makeText(this,"点击了保存" , Toast.LENGTH_SHORT).show();
            }
            break;
        }case 2:
            if(item.getItemId()==1){
                Toast.makeText(this,"点击了复制" , Toast.LENGTH_SHORT).show();
            }else if(item.getItemId()==2){
                Toast.makeText(this,"点击了粘贴" , Toast.LENGTH_SHORT).show();
            }if(item.getItemId()==3){
                Toast.makeText(this,"点击了剪切" , Toast.LENGTH_SHORT).show();
            }
        }
        return super.onOptionsItemSelected(item);
    }
}