ArrayList<LatLng> mArrayLatLng;

private void listOfLocations(){
     mArrayLatLng = new ArrayList<>();
     mArrayLatLng.add(new LatLng(51.9574, -1.84763));
     mArrayLatLng.add(new LatLng(51.9474, -1.74763));
     mArrayLatLng.add(new LatLng(51.9374, -1.64763));
     mArrayLatLng.add(new LatLng(51.9274, -1.54763));
     mArrayLatLng.add(new LatLng(51.9174, -1.44763));
 }

private void loadLocation() {
     listOfLocations();
     new FetchJSON().execute();
 }

@Override
     protected void onPostExecute(LatLng latLng) {
         try{
             if(latLng != null){
                 mLatLng = latLng;
                 startAutoHandler();
             }

         }
         catch(Exception ex){
             Log.e(TAG, "onPostExecute" + ex.getMessage());
         }
     }

private void displayMarker(){
     if(mMap == null) return;
     if(mLatLng == null) return;

     mMap.clear();

     MarkerOptions markerOption = new MarkerOptions();
     markerOption.position(mLatLng);
     CameraUpdate loc = CameraUpdateFactory.newLatLngZoom(mLatLng, 10.3f);
     mMap.animateCamera(loc);
     mMap.addMarker(markerOption);
 }

Handler mAutoHandler = new Handler();
 long delay = 5000l;

 private void startAutoHandler(){
     try{
         Log.e(TAG, "startAutoHandler");
         mAutoHandler.postDelayed(mAutoRunnable, delay);
     }
     catch (Exception ex){
         Log.e(TAG, ex.getMessage());
     }
 }


 int index = 0;
 private Runnable mAutoRunnable = new Runnable() {
     @Override
     public void run() {
         int len = mArrayLatLng.size();
         if(len < 1) return;

         if(index > len){
             index = 0;
         }
         mLatLng = mArrayLatLng.get(index);
         index++;

         displayMarker();
         mAutoHandler.postDelayed(mAutoRunnable, delay);
     }
 };

 private void stopAutoHandler(){
     mAutoHandler.removeCallbacks(mAutoRunnable);
 }