Невозможно остановить сигнал вызова в Android

Question

Я пытаюсь в течение одной минуты включить будильник в приложении для Android. Но будильник звонит бесконечно. Почему?

Предложения пожалуйста

Спасибо за ваше драгоценное время!..

Пожалуйста, найдите мой logcat и источники для справки

Logcat

05-25 15:23:01.616: D/Ringtone(1657): HWDrmException :nativeCreateDrmContent() returned JNI_DRM_FAILURE65538
05-25 15:23:15.546: E/MediaPlayer(1657): internal/external state mismatch corrected
05-25 15:23:17.486: E/MediaPlayer(1657): internal/external state mismatch corrected
05-25 15:23:21.316: E/MediaPlayer(1657): internal/external state mismatch corrected

AndroidAlarmService.java

public class AndroidAlarmService extends Activity {

private PendingIntent pendingIntent;

/** Called when the activity is first created. */

@Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

 Intent myIntent = new Intent(AndroidAlarmService.this, RepeatingAlarm.class);
 pendingIntent = PendingIntent.getBroadcast(AndroidAlarmService.this, 0, myIntent, 0);

 AlarmManager aM = (AlarmManager)getSystemService(ALARM_SERVICE);

 Calendar c=Calendar.getInstance();
 c.set(Calendar.HOUR, 2);
 c.set(Calendar.MINUTE, 45);
 c.set(Calendar.SECOND, 0);

 PendingIntent pi = PendingIntent.getBroadcast(AndroidAlarmService.this, 0, myIntent, 0);
 aM.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY,pendingIntent);
}
}    

RepeatingAlarm.java

public class RepeatingAlarm extends BroadcastReceiver
{

MediaPlayer mRingtoneLooper;
    @Override
    public void onReceive(Context context, Intent intent)
    {   
        Toast.makeText(context,"Alarm Started.....", Toast.LENGTH_LONG).show();


Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            final Ringtone r = RingtoneManager.getRingtone(context, notification);

            Timer star_ringtone =  new Timer();
            while(r!=null){
                if(!r.isPlaying()){
                    r.play();
                }
                    star_ringtone.schedule(new TimerTask() {

                        @Override
                        public void run() {
                            // TODO Auto-generated method stub
                            r.stop();
                            }
                        },60000);
                    }

            // Vibrate the mobile phone
            Vibrator vb = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
            vb.vibrate(1000);
}}