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;
}

}