Simple Example of android widget desktop plug-in

To create a plug-in that can be displayed on the desktop, three steps are required: 1. inherit AppWidgetProvider 2. compile the interface xml of the widget and write the mywidget property xml 3. androidManifest. the xml registration plug-in is a self-incrementing number, which is very simple. 1. inherit from AppWidgetProvider [java] public class MyWidgetProvider extends AppWidgetProvider {private static Timer myTimer; private static int index = 0; private final String broadCastString = "knowheart. wd. appWidgetUpdate "; @ Override public void onDeleted (Context context, int [] appWidgetIds) {// TODO Auto-generated method stub super. onDeleted (context, appWidgetIds);} @ Override public void onEnabled (Co Ntext context) {// TODO Auto-generated method stub super. onEnabled (context) ;}@ Override public void onUpdate (Context context, AppWidgetManager appWidgetManager, int [] appWidgetIds) {// TODO Auto-generated method stub super. onUpdate (context, appWidgetManager, appWidgetIds) ;}@ Override public void onReceive (Context context, Intent intent) {super. onReceive (context, intent) ;}first, we add a class to inherit the Ap PWidgetProvider, which is used to control the update and deletion operations of our plug-in. Here we will use three methods: onEnabled, onUpdate, and onReceive. compile the widget interface xml and write the mywidget attributes xmllayout/widget_layout.xml [html] <? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: orientation = "vertical" android: background = "#000000" android: layout_gravity = "center_horizontal" android: layout_width = "300dp" android: layout_height = "wrap_content"> <TextView android: id = "@ + id/update" android: text = "0" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: gravity = "center"/> </Lin EarLayout> Create a folder named xml and add an xml file named xml/mywidget. xml [html] <? Xml version = "1.0" encoding = "UTF-8"?> <Appwidget-provider xmlns: android = "http://schemas.android.com/apk/res/android" android: minWidth = "300dip" android: minHeight = "72dp" android: updatePeriodMillis = "86400000" android: initialLayout = "@ layout/widget_layout"> </appwidget-provider> set the length, width, and refresh time of the plug-in. 0 indicates manual refresh, and xml of the plug-in interface. 3. androidManifest. xml registration plug-in [html] <! -- Register the plug-in --> <javaser android: name = "MyWidgetProvider"> <intent-filter> <action android: name = "android. appwidget. action. APPWIDGET_UPDATE "/> <action android: name =" com. wd. appWidgetUpdate "> </action> </intent-filter> <meta-data android: name =" android. appwidget. provider "android: resource =" @ xml/mywidget "/> </javaser> <action android: name =" com. wd. appWidgetUpdate "> This section registers a broadcast to the system. We will send the broadcast to the AppW during logic processing. Update method of idgetProvider to achieve manual refresh. After completing the above three steps, a plug-in is displayed on the desktop. If we want the number displayed by the plug-in to add one per second, we need to perform background processing [java] public class MyWidgetProvider extends AppWidgetProvider {private static Timer myTimer; private static int index = 0; // define the event private final String broadCastString = "com. wd. appWidgetUpdate "; @ Override public void onDeleted (Context context, int [] appWidgetIds) {// TODO Auto-generated method stub super. onDeleted (context, appWidgetIds); System. out. println ("onDeleted") ;}@ Override public void onEnabled (Context context) {System. out. println ("onEnabled"); // TODO Auto-generated method stub super. onEnabled (context); // This is called when the plug-in is created. Therefore, we enable a timer to execute MyTask mMyTask = new MyTask (context) every second ); myTimer = new Timer (); myTimer. schedule (mMyTask, 1000,100 0); System. out. println ("onEnabled2") ;}@ Override public void onUpdate (Context context, AppWidgetManager appWidgetManager, int [] appWidgetIds) {System. out. println ("onUpdate"); // TODO Auto-generated method stub super. onUpdate (context, appWidgetManager, appWidgetIds) ;}@ Override public void onReceive (Context context, Intent intent) {// when it is determined that the event was sent, we will get the plug-in interface, and then import the index self-added to the textview System. out. println ("onReceive"); if (intent. getAction (). equals (broadCastString) {index ++; RemoteViews rv = new RemoteViews (context. getPackageName (), R. layout. widget_layout); rv. setTextViewText (R. id. update, Integer. toString (index); // display the interface to AppWidgetManager appWidgetManager = AppWidgetManager in the plug-in. getInstance (context); ComponentName componentName = new ComponentName (context, MyWidgetProvider. class); appWidgetManager. updateAppWidget (componentName, rv);} // TODO Auto-generated method stub super. onReceive (context, intent);} class MyTask extends TimerTask {private Context mcontext = null; private Intent intent = null; public MyTask (Context context) {// create a new Intent mcontext = context; intent = new Intent (); intent. setAction (broadCastString) ;}@ Override public void run () {System. out. println ("2"); // send broadcast (received by onReceive) mcontext. sendBroadcast (intent );}}}