动作提供者(ActionProvider)在动作栏中的使用

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activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="match_parent"    android:orientation="vertical"     style="?android:attr/actionButtonStyle"    android:layout_gravity="center"    android:addStatesFromChildren="true"    android:background="?android:attr/actionBarItemBackground"    android:focusable="true">        <ImageButton         android:id="@+id/button"        android:layout_width="48dip"        android:layout_height="48dip"        android:layout_gravity="center"        android:adjustViewBounds="true"        android:background="@drawable/ic_launcher"        android:contentDescription="设置"        android:scaleType="fitCenter"/>    </LinearLayout>

在res/menu/main.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:id="@+id/menu_item_action_provider_action_bar"        android:actionProviderClass="com.example.demoactionprovider.SettingsActivity$SettingsActionProvider"        android:showAsAction="ifRoom"        android:title="设置1"/>        <item android:id="@+id/menu_item_action_provider_overflow"        android:actionProviderClass="com.example.demoactionprovider.SettingsActivity$SettingsActionProvider"        android:showAsAction="never"        android:title="设置2"/></menu>

SettingsActivity.java:

package com.example.demoactionprovider;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.provider.Settings;import android.view.ActionProvider;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.widget.ImageButton;public class SettingsActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}public static class SettingsActionProvider extends ActionProvider{private static final Intent settingsIntent = new Intent(Settings.ACTION_SETTINGS);private Context context;public SettingsActionProvider(Context context){super(context);this.context = context;}public View onCreateActionView(){LayoutInflater inflater = LayoutInflater.from(context);View view = inflater.inflate(R.layout.action_provier, null);ImageButton button = (ImageButton)view.findViewById(R.id.button);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {context.startActivity(settingsIntent);}});return view;}public boolean onPerformDefaultAction(){context.startActivity(settingsIntent);return true;}}}

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