Why doesn't Timer work in Thread?

Question

Java

Implemented sending the user's coordinates to the server, in the UI thread without TIMER the code is working, now I'm trying to run the thread every 5 seconds, below is the listing

private void refreshUserCoordinates(final Context contextThread) {
    Intent intent = getIntent();
    final String user = intent.getStringExtra("user");
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            GeoPosition geoPosition = new GeoPosition();
            geoPosition.SetUpLocationListener(contextThread);
            ServerInteraction serverInteraction = new ServerInteraction("http://razdvatri/refreshCoordinates.php",
                    "{\"user\" " + ":\"" + user + "\", \"latitude\" " + ":\"" + geoPosition.getLatitude() + "\", \"longitude\" :" + "\"" + geoPosition.getLongitude() + "\"" + "}", "put");
            serverInteraction.execute();
        }
    }, 0L, 50L * 1000);
}

Here is what LogCat says

util.TimerThread.mainLoop(Timer.java:555) at java.util.TimerThread.run(Timer.java:505) 05-17 16:14:30.306 5372-5372/popovvad.findme D/AndroidRuntime: Shutting down VM 05 -17 16:14:30.307 5372-5372/popovvad.findme I/Process: Sending signal. PID: 5372 SIG: 9

I understand that the main error is described here -

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

How to fix?

Answer 1

It helped in the end in the run () method to add

if (Looper.myLooper() == null){
     Looper.prepare();
 }

Full listing

private void refreshUserCoordinates(final Context contextThread) {
    Intent intent = getIntent();
    final String user = intent.getStringExtra("user");
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            if (Looper.myLooper() == null)
            {
                Looper.prepare();
            }
            GeoPosition geoPosition = new GeoPosition();
            geoPosition.SetUpLocationListener(contextThread);
            ServerInteraction serverInteraction = new ServerInteraction("http://razdvatri.ru/refreshCoordinates.php",
                    "{\"user\" " + ":\"" + user + "\", \"latitude\" " + ":\"" + geoPosition.getLatitude() + "\", \"longitude\" :" + "\"" + geoPosition.getLongitude() + "\"" + "}", "put");
            serverInteraction.execute();
        }
    }, 0L, 50L * 1000);
}