1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     android:background="#FFFFFF"
 6     android:orientation="vertical" >
 7 
 8     <RelativeLayout
 9         android:layout_width="fill_parent"
10         android:layout_height="45dp"
11         android:background="#303538" >
12         <Button
13             android:id="@+id/button_showPopup"
14             android:layout_width="wrap_content"
15             android:layout_height="fill_parent"
16             android:layout_alignParentRight="true"
17             android:background="#303538"
18             android:text="┇"
19             android:textColor="#FFFFFF"
20             android:textSize="20sp" >
21         </Button>
22     </RelativeLayout>
23 
24 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <menu xmlns:android="http://schemas.android.com/apk/res/android" >
 3 
 4     <item
 5         android:id="@+id/about"
 6         android:orderInCategory="100"
 7         android:showAsAction="never"
 8         android:title="关于">
 9     </item>
10     <item
11         android:id="@+id/exit"
12         android:orderInCategory="100"
13         android:showAsAction="never"
14         android:title="退出">
15     </item>
16 
17 </menu>

 1 package com.wangzhen.popup;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.MenuItem;
 6 import android.view.View;
 7 import android.view.View.OnClickListener;
 8 import android.view.Window;
 9 import android.widget.Button;
10 import android.widget.PopupMenu;
11 import android.widget.Toast;
12 
13 public class Main extends Activity implements OnClickListener,
14         android.widget.PopupMenu.OnMenuItemClickListener {
15     /** Called when the activity is first created. */
16     private Button button_showPopup;
17 
18     @Override
19     public void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         requestWindowFeature(Window.FEATURE_NO_TITLE);
22         setContentView(R.layout.main);
23         initViews();
24     }
25 
26     // 初始化控件
27     private void initViews() {
28         // TODO Auto-generated method stub
29         button_showPopup = (Button) findViewById(R.id.button_showPopup);
30         button_showPopup.setOnClickListener(this);
31     }
32 
33     public void onClick(View arg0) {
34         // TODO Auto-generated method stub
35         switch (arg0.getId()) {
36         case R.id.button_showPopup:
37             PopupMenu pop = new PopupMenu(this, arg0);
38             pop.getMenuInflater().inflate(R.menu.menu, pop.getMenu());
39             pop.show();
40             pop.setOnMenuItemClickListener(this);
41             break;
42         }
43     }
44 
45     public boolean onMenuItemClick(MenuItem arg0) {
46         // TODO Auto-generated method stub
47         switch (arg0.getItemId()) {
48         case R.id.about:
49             Toast.makeText(this, "关于", 1000).show();
50             break;
51         case R.id.exit:
52             finish();
53             break;
54         }
55         return false;
56     }
57 }