Android Widget (1) Simple implementation

Android Widget (1) Simple implementation

Add a Widget to the screen: Long and press the blank area on the screen, or find the selection of the WidgetPreview App. Native systems use a long press mode below 4.0, and open WIDGETS at 4.0 or above

General steps for creating a Widget:
In menifest

Widget description file: timer_widget_provider.xml

Widget layout: timer_widget.xml

AppWidgetProvider for processing Widget-related events

Package com. stone. ui; import java. util. arrays; import com. stone. r; import com. stone. service. timerWidgetService; import android. app. pendingIntent; import android. appwidget. appWidgetHost; import android. appwidget. appWidgetManager; import android. appwidget. appWidgetProvider; import android. content. componentName; import android. content. context; import android. content. intent; import android. text. format. dateUtils; import android. widget. remoteViews;/** AppWidgetProvider must receive android. appwidget. action. APPWIDGET_UPDATE broadcast **/public class TimerWidgetProvider extends AppWidgetProvider {@ Override // called when updating parts. public void onUpdate (Context context, AppWidgetManager appWidgetManager, int [] appWidgetIds) {super. onUpdate (context, appWidgetManager, appWidgetIds); System. out. println ("onUpdate widget:" + Arrays. toString (appWidgetIds);/** construct a pendingIntent broadcast. onReceive () Updates */Intent intent = new Intent (context, TimerWidgetService Based on the received broadcast. class); PendingIntent pendingIntent = PendingIntent. getService (context, 0, intent, 0); RemoteViews rv = new RemoteViews (context. getPackageName (), R. layout. timer_widget); rv. setOnClickPendingIntent (R. id. start_stop, pendingIntent); appWidgetManager. updateAppWidget (appWidgetIds, rv) ;}@ Override // The widget deletes public void onDeleted (Context context, int [] appWidgetIds) {super. onDeleted (context, appWidgetIds); System. out. println ("onDeleted widget");} @ Override // This is called for the first time you create the widget. Otherwise, the public void onEnabled (Context context) {super. onEnabled (context); System. out. println ("onEnabled widget") ;}@ Override // call the public void onDisabled (Context context) {super. onDisabled (context); System. out. println ("onDisabled widget");} @ Override // public void onReceive (Context context, Intent intent) {super. onReceive (context, intent); System. out. println ("onReceive widget");/** receives these broadcasts from other components, activities, or services */if (intent. getAction (). equals ("com. stone. action. start ") {long time = intent. getLongExtra ("time", 0); updateWidget (context, time); System. out. println ("receive com. stone. action. start ") ;}} private void updateWidget (Context context, long time) {// RemoteViews process ViewRemoteViews rv = new RemoteViews (context. getPackageName (), R. layout. timer_widget); System. out. println ("time =" + time); rv. setTextViewText (R. id. counter, DateUtils. formatElapsedTime (time/1000); AppWidgetManager am = AppWidgetManager. getInstance (context); int [] appWidgetIds = am. getAppWidgetIds (new ComponentName (context, TimerWidgetProvider. class); am. updateAppWidget (appWidgetIds, rv); // update all instances }}

TimerWidgetService used in AppWidgetProvider

Package com. stone. service; import android. app. service; import android. content. intent; import android. OS. IBinder; public class TimerWidgetService extends Service {@ Overridepublic IBinder onBind (Intent intent) {return null ;}@ Overridepublic void onCreate () {super. onCreate () ;}@ Overridepublic int onStartCommand (Intent intent, int flags, int startId) {/** do some thing * // send a broadcast notification to the widget to update the sendBroadcast status (new Intent ("com. stone. action. start "). putExtra ("time", System. currentTimeMillis (); return Service. START_STICKY ;}}