android 弹出菜单

<!-- 定义基础布局LinearLayout -->
<LinearLayout 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"
    android:orientation="vertical">
    <!-- 定义TextView控件 -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="请按键盘物理菜单键，弹出选项菜单"
        />
</LinearLayout>

package com.example.yanlei.yl2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

//导入必备的包

public class MainActivity extends AppCompatActivity {

    //定义Menu中每个菜单选项的Id
    private final static int Menu_1 = Menu.FIRST;
    private final static int Menu_2 = Menu.FIRST + 1;
    private final static int Menu_3 = Menu.FIRST + 2;
    private final static int Menu_4 = Menu.FIRST + 3;
    private final static int Menu_5 = Menu.FIRST + 4;
    private final static int Menu_6 = Menu.FIRST + 5;
    private final static int Menu_7 = Menu.FIRST + 6;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); // 调用父类的onCreate方法
        // 通过setContentView方法设置当前页面的布局文件为activity_main
        setContentView(R.layout.activity_main);
    }

    //创建Menu菜单的回调方法
    public boolean onCreateOptionsMenu(Menu m) {
        //参数m就是拿到的当前Activity菜单对象
        //想要给当前页面添加方法的话就add进去即可
        //add方法的参数：add(分组id,itemid, 排序, 菜单文字)
        m.add(0, Menu_1, 0, "编辑模式");
        m.add(0, Menu_2, 0, "修改壁纸");
        m.add(0, Menu_3, 0, "全局搜索");
        m.add(0, Menu_4, 0, "桌面缩略图");
        m.add(0, Menu_5, 0, "桌面效果");
        m.add(0, Menu_6, 0, "系统设置");
        m.add(0, Menu_7, 0, "用户信息");
        return super.onCreateOptionsMenu(m);
    }

    //Menu菜单选项的选项选择的回调事件
    public boolean onOptionsItemSelected(MenuItem item) {
        //参数为用户选择的菜单选项对象
        //根据菜单选项的id来执行相应的功能
        switch (item.getItemId()) {
            case 1:
                Toast.makeText(this, "你点击了编辑模式选项", Toast.LENGTH_SHORT).show();
                break;
            case 2:
                Toast.makeText(this, "你点击了修改壁纸", Toast.LENGTH_SHORT).show();
                break;
            case 3:
                Toast.makeText(this, "你点击了全局搜索", Toast.LENGTH_SHORT).show();
                break;
            case 4:
                Toast.makeText(this, "你点击了桌面缩略图", Toast.LENGTH_SHORT).show();
                break;
            case 5:
                Toast.makeText(this, "你点击了桌面效果", Toast.LENGTH_SHORT).show();
                break;
            case 6:
                Toast.makeText(this, "你点击了系统设置", Toast.LENGTH_SHORT).show();
                break;
            case 7:
                Toast.makeText(this, "你点击了用户信息", Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    // 选项菜单关闭时的回调方法
    public void onOptionsMenuClosed(Menu menu) {
        Log.e("onOptionsMenuClosed","用户菜单关闭了");
    }

    // 菜单显示之前的回调方法
    public boolean onPrepareOptionsMenu(Menu menu) {
        Log.e("onPrepareOptionsMenu","用户菜单准备好被显示了");
        //方法返回true，就会显示Menu，否则Menu不会被显示
        return true;
    }

}