Android 3.0 的彈出菜單(PopupMenu)

Android 3.0, API Level 11, 的彈出菜單(PopupMenu)在一個模態的彈出窗口(modal popup window)之上顯示菜單.

實例:



創建/res/menu/popupmenu.xml文件, 定義彈出菜單(PopupMenu)的佈局.

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:id="@+id/popupmenu">
    <item android:id="@+id/menu1"
        android:title="item 1"/>
    <item android:id="@+id/menu2"
        android:title="item 2"/>
    <item android:id="@+id/menu3"
        android:title="item 3"/>
</group>
</menu>

修改 main.xml 添加一個按鈕啟動彈出菜單.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >

  <TextView
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="@string/hello" />
  <Button
      android:id="@+id/startpopupmenu"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Start PopupMenu"
      />

</LinearLayout>

主Java代碼.

package com.Android3PopupMenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupMenu;

public class Android3PopupMenuActivity extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      Button buttonPopupMenu = (Button)findViewById(R.id.startpopupmenu);
      buttonPopupMenu.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View view) {
    // TODO Auto-generated method stub
    PopupMenu popupMenu = new PopupMenu(Android3PopupMenuActivity.this, view);
    popupMenu.getMenuInflater().inflate(R.menu.popupmenu, popupMenu.getMenu());
    
    popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

     @Override
     public boolean onMenuItemClick(MenuItem item) {
      // Do something...
      return true;
     }
     
    });
    
    popupMenu.show();
   }});
  }
}