[Android] เรื่องการแชร์ตัวแปรระหว่าง Activity กับ Sevice

      Intent intrack = new Intent(hatebug.this,trackservice.class);
               intrack.putExtra("LT", lattointent); //lattointent คือ latitude ตำแหน่งเริ่ม
               intrack.putExtra("LN", lontointent); //lontointent คือ longitude ตำแหน่งเริ่ม
     PendingIntent tracklocal = PendingIntent.getService(hatebug.this, 0, intrack, PendingIntent.FLAG_CANCEL_CURRENT);
     AlarmManager alarmtrack = (AlarmManager)getSystemService(ALARM_SERVICE);
     alarmtrack.setRepeating(AlarmManager.RTC_WAKEUP, calendartrack.getTimeInMillis(),10000, tracklocal);

public void onStart(Intent intent,int startId){
			// TODO Auto-generated method stub
		final float latserv = intent.getFloatExtra("LT", 0);
		final float lonserv  =intent.getFloatExtra("LN", 0);		
        	final LocationManager locate = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    	        final LocationListener locationserv = new LocationListener() {
			@Override
			public void onLocationChanged(Location location) {
				// TODO Auto-generated method stub
				
                           // หาระยะห่าง d
                                String slat = String.valueOf(latserv);
				String slon = String.valueOf(lonserv);
				float lat = (float) location.getLatitude();
				float lon = (float) location.getLongitude();
				float dlat = (float) Math.toRadians(lat - latserv);
				float dlon = (float) Math.toRadians(lon - lonserv);
				float a1 = (float) ((Math.sin(dlat/2))*(Math.sin(dlat/2)));
    			        float a2 = (float) ((Math.cos(Math.toRadians(lon)))*(Math.cos(Math.toRadians(100.546652)))*(Math.sin(dlon/2))*(Math.sin(dlon/2)));
    			        float a = a1+a2;
    			        float c = (float) (2*Math.atan2(Math.sqrt(a), Math.sqrt(1-a)));
    			        float d = 6371000*c;  
	           //ไม่มีอะไร เอาไว้ monitor
    			String f = String.valueOf(chkn);
    			String lool = String.format("Latitude\t\t: %1$s\nLongitude\t: %2$s\nDistance\t\t: %3$f\n%4$s\n%5$s\n%6$s",lat,lon,d,f,slat,slon); 
    			Toast.makeText(getApplicationContext(), String.valueOf(chkn)+" "+String.valueOf(d), Toast.LENGTH_SHORT).show(); 

           //เช็คว่า d มากกว่า 10 เมตรหรือไม่
    			if(d>10)
    			{   	
    					
    					Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
    					vibrator.vibrate(1000);		
    				}
    			}

final int chkn = intent.getIntExtra("CP", 2);// 2 คือค่าที่จะใช้ในchknเมื่อ"CP" ไม่มีค่าเก็บไว้ 
 

                 if(d>10)
    			{   	
    				if(chkn==2)
    				{			
    					Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
    					vibrator.vibrate(1000);	 
    					Toast.makeText(getApplicationContext(), lool+"\n666", Toast.LENGTH_SHORT).show(); 
    					Intent chekin = new Intent(trackservice.this,trackservice.class);
    					chekin.putExtra("CP", 1);
    					chekin.putExtra("LT", latserv);
    					chekin.putExtra("LN", lonserv);	
    					startService(chekin);
    				}
    			}
    			else if(d<10)
    			{
    				if(chkn==1)
    				{
    				Toast.makeText(getApplicationContext(), lool+"\n000", Toast.LENGTH_SHORT).show(); 
    				Intent chekin = new Intent(trackservice.this,trackservice.class);
					chekin.putExtra("CP", 2);
					chekin.putExtra("LT", latserv);
					chekin.putExtra("LN", lonserv);	
					startService(chekin);
    				}
    			}