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>

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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;     }   }