public class ExampleAppWidgetProvider extends AppWidgetProvider {
	// onEnabled(Context) 		  widget可用触发
	// onDisabled(Context)  	  widget不可用触发
	// onDeleted(Context, int[])  widget被删除触发
	
	// widget更新触发
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {  
        final int N = appWidgetIds.length;  
        // Perform this loop procedure for each App Widget that belongs to this provider  
        for (int i=0; i<N; i++) {  
            int appWidgetId = appWidgetIds[i];
			
            // Create an Intent to launch ExampleActivity  
            Intent intent = new Intent(context, ExampleActivity.class);  
            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
			
            // Get the layout for the App Widget and attach an on-click listener  
            // to the button  
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider_layout);  
            views.setOnClickPendingIntent(R.id.button, pendingIntent);  
  
            // Tell the AppWidgetManager to perform an update on the current app widget  
            appWidgetManager.updateAppWidget(appWidgetId, views);  
        }  
    }
	
	@Override  
    public void onReceive(Context context, Intent intent) {  
        AppWidgetManager mgr = AppWidgetManager.getInstance(context);  
		if (intent.getAction().equals(TOAST_ACTION)) {  
            int appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,  
                AppWidgetManager.INVALID_APPWIDGET_ID);  
            int viewIndex = intent.getIntExtra(EXTRA_ITEM, 0);  
            Toast.makeText(context, "Touched view " + viewIndex, Toast.LENGTH_SHORT).show();  
        }  
        super.onReceive(context, intent);		
		// Intent意图:
		// ACTION_APPWIDGET_UPDATE //处理更新
		// ACTION_APPWIDGET_DELETED // 处理删除
		// ACTION_APPWIDGET_ENABLED //可用
		// ACTION_APPWIDGET_DISABLED //不可用
		// ACTION_APPWIDGET_OPTIONS_CHANGED // 配置改变
    }
}