//AppWidgetManager.getInstance(mContext).notifyAppWidgetViewDataChanged(mAppWidgetId, R.id.notification_list);
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(mContext);
int appWidgetIds[] = appWidgetManager.getAppWidgetIds(
new ComponentName(mContext, NotificationWidgetProvider.class));
appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.notification_list);
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