Android Repeating Notifications Fire Even After Being Deleted

I have tried to make an Android reminder but something has gone wrong; when I set a repeating notification in my app the notification keeps firing untill I uninstall the app (deleting the repeating notification does not prevent it from going off). Considering this, my reminders are deleted from the database when I delete them.

This issue is also the case with my repeating alarms.

What should I do?

here are some parts of my code:

// the delete query in database class

public boolean deleteReminder(long rowId) {

    retu mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}

// how I delete a reminder in my main activity

 @Override
public boolean onContextItemSelected(MenuItem item) {
    switch(item.getItemId()) {
    case R.id.menu_delete:
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
        mDbHelper.deleteReminder(info.id);
        fillData();
        retu true;
    }
    retu super.onContextItemSelected(item);
}

ReminderManager.java

public class ReminderManager {

private Context mContext; 
private AlarmManager mAlarmManager;

public ReminderManager(Context context) {
    mContext = context; 
    mAlarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
}

public void setReminder(Long taskId, Calendar when) {

    Intent i = new Intent(mContext, OnAlarmReceiver.class);
    i.putExtra(RemindersDbAdapter.KEY_ROWID, (long)taskId); 

    PendingIntent pi = PendingIntent.getBroadcast(mContext, 0, i, PendingIntent.FLAG_ONE_SHOT); 

    mAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, when.getTimeInMillis(), 60 * 1000, pi);
}
}

ReminderService.java

public class ReminderService extends WakeReminderIntentService {

public ReminderService() {
    super("ReminderService");
        }

@Override
void doReminderWork(Intent intent) {
    Log.d("ReminderService", "Doing work.");
    Long rowId = intent.getExtras().getLong(RemindersDbAdapter.KEY_ROWID);

    NotificationManager mgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(this, ReminderEditActivity.class); 
    notificationIntent.putExtra(RemindersDbAdapter.KEY_ROWID, rowId); 

    PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT); 

    Notification note=new Notification(android.R.drawable.stat_sys_waing, getString(R.string.notify_new_task_message), System.currentTimeMillis());
    note.setLatestEventInfo(this, getString(R.string.notify_new_task_title), getString(R.string.notify_new_task_message), pi);
    note.defaults |= Notification.DEFAULT_SOUND; 
    note.flags |= Notification.FLAG_AUTO_CANCEL; 

    int id = (int)((long)rowId);
    mgr.notify(id, note); 


}
}

OnAlarmReceiver.java

public class OnAlarmReceiver extends BroadcastReceiver {

private static final String TAG = ComponentInfo.class.getCanonicalName(); 


@Override   
public void onReceive(Context context, Intent intent) {
    Log.d(TAG, "Received wake up from alarm manager.");

    long rowid = intent.getExtras().getLong(RemindersDbAdapter.KEY_ROWID);

    WakeReminderIntentService.acquireStaticLock(context);

    Intent i = new Intent(context, ReminderService.class); 
    i.putExtra(RemindersDbAdapter.KEY_ROWID, rowid);  
    context.startService(i);

}
}