maPosition.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                Geocoder gc = new Geocoder(getActivity());
                getLocation();
                List<Address> list = null;
                try {
                        list = gc.getFromLocation(lat, lng, 1);
                        if (list!= null) {
                                Address returnedAddress = list.get(0);
                                start_address.setText(returnedAddress.getAddressLine(0) + ", " + returnedAddress.getPostalCode() + " " + returnedAddress.getLocality());
                        } else {
                                start_address.setText("No Address returned!");
                        }
                } catch (IOException e) {
                        e.printStackTrace();
                        start_address.setText("Cannot get address");
                }

        }
});

maPosition.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               new Thread(new Runnable() {
                   @Override
                   public void run() {
                       Geocoder gc = new Geocoder(getActivity());
                       List<Address> list = null;
                       try {
                           list = gc.getFromLocation(lat, lng, 1);
                           //  start_address.setText(Double.toString(lat));
                           if(list!= null && !list.isEmpty()) {
                               Address returnedAddress = list.get(0);
                               StringBuilder adressBuilder = new StringBuilder();
                               adressBuilder.append(returnedAddress.getAddressLine(0) + ", " + returnedAddress.getPostalCode() + " " + returnedAddress.getLocality());
                               getActivity().runOnUiThread(new Runnable() {
                                   @Override
                                   public void run() {
                                       start_address.setText("No Address returned!");
                                   }
                                   //job done on the UI thread
                               });
                           }
                           else{
                               getActivity().runOnUiThread(new Runnable() {
                                   @Override
                                   public void run() {
                                       start_address.setText("No Address returned!");
                                   }
                                   //job done on the UI thread
                               });
                           }
                       } catch (IOException e) {
                           e.printStackTrace();
                       }
                   }
               }).start();

            }
        });

list = gc.getFromLocation(lat, lng, 1);
 if (list != null && !list.isEmpty()) {
     Address returnedAddress = list.get(0);
     //...

new Thread(new Runnable() {
    public void run() {
         //job done on a background thread, e.g. getFromLocation() call
     }
}).start();

getActivity().runOnUiThread(new Runnable() {
    //job done on the UI thread
});