Menu菜单的代码和xml的创建

demo

res/menu/menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_new"
        android:icon="@android:drawable/ic_menu_help"
        android:title="新建"/>
    <item
        android:id="@+id/menu_delete"
        android:icon="@android:drawable/ic_menu_delete"
        android:title="删除"/>
    <item android:title="子菜单">
        <menu >
            <item android:id="@+id/menu_sub1"
                android:title="子菜单1"/>
            <item android:id="@+id/menu_sub2"
                android:title="子菜单2"/>
        </menu>
    </item>

</menu>

MainActivity

package com.android.hzy.menu;

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

public class MainActivity extends Activity {

    private static final int MENU_NEW_ID = 0;
    private static final int MENU_DELETE_ID = 1;
    private static final int MENU_SUB1_ID = 2;
    private static final int MENU_SUB2_ID = 3;

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

    // 创建菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
//        menu.add(0, MENU_NEW_ID, 0, "新建");
//        menu.add(0, MENU_DELETE_ID, 0, "删除");
//        // 创建的子菜单
//        SubMenu subMenu = menu.addSubMenu("子菜单");
//        subMenu.add(1, MENU_SUB1_ID, 0, "子菜单1");
//        subMenu.add(2, MENU_SUB2_ID, 0, "子菜单2");
        
        // 通过配置文件来创建menu菜单
        MenuInflater mInflater = getMenuInflater();
        mInflater.inflate(R.menu.menu, menu);
        return super.onCreateOptionsMenu(menu);
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        int id = item.getItemId();
        switch (id) {
        case MENU_NEW_ID:
            Toast.makeText(this, "您选择了 ：" + item.getTitle(), 0).show();
            break;
        case MENU_DELETE_ID:
            Toast.makeText(this, "您选择了 ：" + item.getTitle(), 0).show();
            break;
        case MENU_SUB1_ID:
            Toast.makeText(this, "您选择了 ：" + item.getTitle(), 0).show();
            break;
        case MENU_SUB2_ID:
            Toast.makeText(this, "您选择了 ：" + item.getTitle(), 0).show();
            break;

        default:
            Toast.makeText(this, "您选择了 ：" + item.getTitle(), 0).show();
            break;
        }
        return super.onOptionsItemSelected(item);
    }

}

示例图：