UpdatingWidget.java

public class UpdatingWidget extends AppWidgetProvider {
    private PendingIntent service;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        final AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        final Intent i = new Intent(context, UpdateService.class);

        if (service == null) {
            service = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
        }
        manager.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), 60000, service);
    }
}