如何自定义ActionProvider

自定义一个MyActionProvider类，继承v4包下的ActionProvider（使用兼容Theme)
重写hasSubMenu（）,返回true
重写onPrepareSubMenu()方法，设置submenu的title、icon、点击事件

package com.example.actionbartest.utils;

import android.R;
import android.content.Context;
import android.support.v4.view.ActionProvider;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.SubMenu;
import android.view.View;
import android.widget.Toast;

/**
 * 写一个带有自定义下拉submenu的ActionProvider
 * @author Frank
 *
 */
public class MyActionProvider extends ActionProvider {

    public MyActionProvider(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    public View onCreateActionView() {
        // TODO Auto-generated method stub
        return null;
    }

    /**
     * 重写hasSubMenu,返回true。
     */
    @Override
    public boolean hasSubMenu() {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public void onPrepareSubMenu(SubMenu subMenu) {
        // TODO Auto-generated method stub
        subMenu.clear();
        subMenu.add("sub title").setIcon(R.drawable.ic_dialog_email).setOnMenuItemClickListener(new OnMenuItemClickListener() {

            @Override
            public boolean onMenuItemClick(MenuItem item) {
                // TODO Auto-generated method stub
                Toast.makeText(getContext(), "this is sub1", Toast.LENGTH_SHORT).show();
                return true;
            }
        });
        subMenu.add("sub title2").setIcon(R.drawable.ic_dialog_map).setOnMenuItemClickListener(new OnMenuItemClickListener() {

            @Override
            public boolean onMenuItemClick(MenuItem item) {
                // TODO Auto-generated method stub
                Toast.makeText(getContext(), "this is sub2", Toast.LENGTH_SHORT).show();
                return true;
            }
        });
    }

}

4、在menu.xml中注册item

    <item 
        android:id="@+id/action_show"
        android:icon="@drawable/ic_action_alarms"
        android:title="Show"
        app:actionProviderClass=
                    "com.example.actionbartest.utils.MyActionProvider"
        app:showAsAction="always"/>

这样就简单的设置了一个ActionProvier，点击会出现两个subtitle