AppWidget应用（三）---PendingIntent 之 getBroadcast

    下面我们来看下appWidget如何通过广播来更新appWidget上的信息，在AppWidget应用（二）的基础上，需要添加一个自定义的消息，并且在AndriodMainfest上注册；代码如下

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.appwidgetdemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.appwidgetdemo.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <receiver android:name="com.example.appwidgetdemo.appWidgetActivity" >            <intent-filter>                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" >                </action>            </intent-filter>            <meta-data                android:name="android.appwidget.provider"                android:resource="@xml/appwidget01" />            <!-- 注册要处理的消息 -->            <intent-filter>                <action android:name="com.example.appWidgetUpdate" >                </action>            </intent-filter>        </receiver>    </application></manifest>

广播消息定义为：private static final String UPDATE_RECEIVE = "com.example.appWidgetUpdate";

然后重载AppWidgetProvider中的几个方法

/** * 接受广播事件 */@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString Msg = intent.getAction();//处理我们自定义的消息if (Msg.equals(UPDATE_RECEIVE)) { // 判断广播如果为：com.qlf.appWidgetUpdate才处理System.out.println("----------------onReceive");// 只能通过远程对象来设置appwidget中的控件状态RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.appwidgetlayout);//改变指定控件的值remoteViews.setTextViewText(R.id.txtapp, "我变-hihi");remoteViews.setImageViewResource(R.id.image, R.drawable.local_file);// 获得appwidget管理实例，用于管理appwidget以便进行更新操作AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);// 相当于获得所有本程序创建的appwidgetComponentName componentName = new ComponentName(context,appWidgetActivity.class);// 更新appwidgetappWidgetManager.updateAppWidget(componentName, remoteViews);}//处理系统发送的消息else{super.onReceive(context, intent);}}/** * 到达指定的更新时间或者当用户向桌面添加AppWidget时被调用 */@Overridepublic void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {System.out.println("----------------onUpdate");// TODO Auto-generated method stub// 创建一个Intent对象Intent intent = new Intent();intent.setAction(UPDATE_RECEIVE);// 这里是getActivity，当然也可以是broadcastReceiver等   发送一个广播消息PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,intent, 0);RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.appwidgetlayout);//为按钮绑定监听器remoteViews.setOnClickPendingIntent(R.id.btnSend, pendingIntent);// 更新AppwidgetappWidgetManager.updateAppWidget(appWidgetIds, remoteViews);}

启动后的效果如图所示：

点击按钮后TextView 和 ImageView都改变了

照旧附上源码

点击打开链接