主要有四個步驟

1、建立一個spinnerAdapter,tigonneirong

2、實現ActionBar.OnNavigationListener介面，處理對錶單選擇

3、建立ActionBar，並設定為下拉列表的導航模式

4、給這個下拉列表設定處理使用者選擇的回撥處理

package com.example.actionbar_drop_down_list;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.ActionBar.OnNavigationListener;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Build;
import android.os.Bundle;

import android.widget.ArrayAdapter;
import android.widget.SpinnerAdapter;

@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class Main extends Activity{
	@SuppressLint("NewApi")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		SpinnerAdapter adapter=ArrayAdapter.createFromResource(this, R.array.song, 
				android.R.layout.simple_spinner_dropdown_item);
		ActionBar bar=getActionBar();
		bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
		bar.setListNavigationCallbacks(adapter, new Down_to_Up());
		
		
	}
	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	class Down_to_Up implements OnNavigationListener{

		String[] listNames = getResources().getStringArray(R.array.song);

        /* 當選擇下拉選單項的時候，將Activity中的內容置換為對應的Fragment */
        public boolean onNavigationItemSelected(int itemPosition, long itemId)
        {
          // 生成自定的Fragment
            SongInfo student = new SongInfo();
            FragmentManager manager = getFragmentManager();
            FragmentTransaction transaction = manager.beginTransaction();
            // 將Activity中的內容替換成對應選擇的Fragment
           transaction.replace(R.id.context, student, listNames[itemPosition]);
         
            transaction.commit();
                 	return true;
         
        }
		
	}
	
	

}
 

package com.example.actionbar_drop_down_list;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;






@SuppressLint("NewApi")
public class SongInfo extends Fragment{

	private String tag;
	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	@SuppressLint("NewApi")
	public void onAttach(Activity activity) {
		
		super.onAttach(activity);
		tag=getTag();
	}

	@SuppressLint("NewApi")
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		TextView tv=new TextView(getActivity());
		tv.setText(tag);
		return tv;
	}
	
	

}
 

<RelativeLayout 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"
    tools:context=".Main" >
   <LinearLayout 
        android:id="@+id/context"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"></LinearLayout> 
</RelativeLayout>
 

//定義一個數組

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">ActionBar_Drop_Down_List</string>
    <string name="action_settings">設定</string>
    <string name="hello_world">Hello world!</string>
    <string-array name="song">
        <item > 杯中影 </item>
        <item >愛情一陣風 </item>
        <item >浪子的心情 </item>
        <item >人生的第一步 </item>
        <item >初戀 </item>
        <item >為你唱一首歌 </item>
        <item >奮鬥的歌手 </item>
  </string-array>

</resources>