public class ShakeMorning extends Activity implements OnClickListener {
 
 Calendar calendar = Calendar.getInstance(); 
 TextView txtLabel; 
 
 TimePickerDialog.OnTimeSetListener timeSetListenr = 
  new TimePickerDialog.OnTimeSetListener() { 
  
 public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
  calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); 
  calendar.set(Calendar.MINUTE, minute); 
  setLabel();              
  } 
 }; 
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  ((Button)findViewById(R.id.BTN_start)).setOnClickListener(this);
  ((Button)findViewById(R.id.BTN_stop)).setOnClickListener(this);
  
  AnalogClock btnTime = (AnalogClock)findViewById(R.id.AnalogClock01); 
  btnTime.setOnClickListener(new Button.OnClickListener() { 
   
   public void onClick(View v) { 
    new TimePickerDialog(ShakeMorning.this, 
      timeSetListenr, 
      calendar.get(Calendar.HOUR_OF_DAY), 
      calendar.get(Calendar.MINUTE), 
      true).show(); 
    } 
   }); 
  
  txtLabel = (TextView)findViewById(R.id.txtTime); 
  setLabel(); 
  } 
 private void setLabel() { 
  txtLabel.setText(DateFormat.getDateTimeInstance().format(calendar.getTime())); 
 } 
 
 public void onClick(View v) {
  // TODO Auto-generated method stub
  switch(v.getId()){
  case R.id.BTN_start:
   RepeatingAlarm_Start_Event();
   finish();
   break;
  case R.id.BTN_stop:
   RepeatingAlarm_Stop_Event();
   break;
  }
 }
 
 private void RepeatingAlarm_Start_Event() {
  Intent intent = new Intent(ShakeMorning.this, RepeatingAlarm.class);
        PendingIntent sender = PendingIntent.getBroadcast(ShakeMorning.this,
                0, intent, 0);
        
        // We want the alarm to go off 30 seconds from now.
        long firstTime = SystemClock.elapsedRealtime();
        firstTime += 15*1000;
        
        AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
        am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                firstTime, 15*1000, sender);
        
        Toast.makeText(ShakeMorning.this, "알람 시작", Toast.LENGTH_LONG).show();
 }
 
 private void RepeatingAlarm_Stop_Event(){
  Intent intent = new Intent(ShakeMorning.this, RepeatingAlarm.class);
      PendingIntent sender = PendingIntent.getBroadcast(ShakeMorning.this,
        0, intent, 0);
      
      // And cancel the alarm.
        AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
        am.cancel(sender);
        
        Toast.makeText(ShakeMorning.this, "알람 취소", Toast.LENGTH_LONG).show();
 }
}

일단 15초후에 처음울리고 계속 15초마다 실행되게 했습니다.
저렇게 말고 타임피커로 저장한 시간에 최초로 실행되게 하는방법 아시면 댓글좀 ㅠㅜ