How to execute two task in timers separately?

Question

Last time my problem is :"java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()". After that, I modify and used HandlerThread to call the location update function. There is no error but the location does not refreshed. Anyone can give some advice?

MyService.java(edited)

   public class MyService extends Service{

    int counter = 0;
    static final int UPDATE_INTERVAL = 15000;
    private Timer timer = new Timer();
    private Timer timer2 = new Timer();
    DefaultHttpClient httpclient;
    HttpPost httppost;
    String line,result;
    HttpResponse response;
    InputStream is;
    BufferedReader reader;
    StringBuilder sb;
    final static String MY_ACTION = "MY_ACTION";
    LocationManager lm;
    LocationListener locationListener;
    String s = "";
    static final int READ_BLOCK_SIZE = 100;
    List<NameValuePair> nameValuePairs;
    private HandlerThread refreshThread = null;


    @Override
    public IBinder onBind(Intent arg0) {
            // TODO Auto-generated method stub
            return null;
    }


    public int onStartCommand(Intent intent, int flags, int startId){
            doSomethingRepeatedly();
            doUpdateLocation();
            return START_STICKY;                
    }

    private void doSomethingRepeatedly(){
            timer.scheduleAtFixedRate(new TimerTask(){
                    public void run(){
                            ...
                    }
            },10000,UPDATE_INTERVAL);
    }


    private void doUpdateLocation(){
        timer2.scheduleAtFixedRate(new TimerTask(){
            public void run(){
                 onClickLoad();
                 lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
                          locationListener = new MyLocationListener();
                          refreshThread = new HandlerThread("GPS Thread");
                           refreshThread.start();
                  new Handler(refreshThread.getLooper()).post(
                  new Runnable() {
                     @Override
               public void run() {
                         lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 60000, 1000, locationListener); 
                     }
                 }
             );                                                                 
                    }
            },10000,UPDATE_INTERVAL);
    }


     private class MyLocationListener implements LocationListener{

                @Override
                public void onLocationChanged(Location arg0) {
                        if(arg0!=null){
                                final String lat = String.valueOf(arg0.getLatitude());
                                final String lon = String.valueOf(arg0.getLongitude());

                                new Thread(){
                                public void run(){
                                        try{ 
                                            DefaultHttpClient httpclient = new DefaultHttpClient();
                                            HttpPost httppost = new HttpPost("http://www.kryptoquest.com/tracker/getLocation.php");
                                            ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(3);
                                            nameValuePairs.add(new BasicNameValuePair("Username", s));
                                            nameValuePairs.add(new BasicNameValuePair("Latitude", lat));
                                            nameValuePairs.add(new BasicNameValuePair("Longitude", lon));
                                            Log.d("Latitude",lat);
                                            Log.d("Longitude",lon);
                                            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                                            httpclient.execute(httppost);
                                        }catch(Exception e){
                                                Log.e("log_tag", "Error:"+e.toString());
                                        }        
                                }
                        }.start();

                        lm.removeUpdates(locationListener);
                        refreshThread.getLooper().quit();
                        }                
                }

                @Override
                public void onProviderDisabled(String provider) {
                        // TODO Auto-generated method stub                             
                }

                @Override
                public void onProviderEnabled(String provider) {
                        // TODO Auto-generated method stub                             
                }

                @Override
                public void onStatusChanged(String provider, int status, Bundle extras) {
                        // TODO Auto-generated method stub                             
                }

        }

     public void onClickLoad(){

                try
                {
                        FileInputStream fIn = openFileInput("user.txt");
                        InputStreamReader isr = new InputStreamReader(fIn);

                        char[] inputBuffer = new char[READ_BLOCK_SIZE];                            

                        int charRead;
                        while((charRead = isr.read(inputBuffer))>0)
                        {
                                String readString = String.copyValueOf(inputBuffer,0,charRead);

                                s += readString;                                     
                                inputBuffer = new char[READ_BLOCK_SIZE];
                        }                            

                }catch(IOException ioe){
                        ioe.printStackTrace();
                }
        }

    public void onDestroy(){
            super.onDestroy();                 
            if(timer != null){
                    timer.cancel();
            }  
            Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
    }

}

Answer 1

This might work: Try running each timer in a different thread.

Answer 2

You cannot call requestLocationUpdates from a timer thread. For more information see requestLocationUpdates gives error "Can't create Handler inside thread that has not called Looper.prepare()

Answer 3

The threads you are using have no Looper.

The second thread, created within the first is causing a crash as there is no Looper inthe first thread to use to send messages to the second thread.

Use Android's HandlerThread instead of using Thread

http://developer.android.com/reference/android/os/HandlerThread.html

Answer 4

you can use Handler in android, you can send message from one thread to another and also schedule messages.