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 -->
- <span style="color:#ff0000;"><intent-filter>
- <action android:name="com.example.appWidgetUpdate" >
- </action>
- </intent-filter></span>
- </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
- */
- @Override
- public void onReceive(Context context, Intent intent) {
- // TODO Auto-generated method stub
- String 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appwidget
- ComponentName componentName = new ComponentName(context,
- appWidgetActivity.class);
- // 更新appwidget
- appWidgetManager.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
- */
- @Override
- public 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Appwidget
- appWidgetManager.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
AppWidget应用(三)---PendingIntent 之 getBroadcast,布布扣,bubuko.com
AppWidget应用(三)---PendingIntent 之 getBroadcast
原文:http://www.cnblogs.com/veins/p/3831778.html