Question

I have an AsyncTask which calls my LocationHandler class method getLocation() which runs a Thread as well. I’m getting the following error:

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

Some answers have included calling Looper related methods but I’d rather not do this as it’s bad practise

Main Activity calls the AsyncTask:

public class Main extends Activity {        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);

        StartProcess sProcess = new StartProcess();
        sProcess.execute(this);
    }
}

AsyncTask:

public class StartProcess extends AsyncTask<Main, Void, Void>
{
    @Override
    protected Void doInBackground(Main... params) {
        LocationHandler lh = new LocationHandler();
        try {
            lh.getLocation(null, params[0]);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return null;
    }
}

LocationHandler, seems to crash when it calls requestLocationUpdates():

public class LocationHandler {
    LocationManager mlocManager;
    MyLocationListener mlocListener;
    Location location;

    public synchronized void getLocation(final View view, final Main main) throws InterruptedException
    {   
        mlocManager = (LocationManager)main.getSystemService(Context.LOCATION_SERVICE);
        mlocListener = new MyLocationListener();
            Looper.prepare();
        mlocManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, 5000, 1, mlocListener);
        mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 5000, 1, mlocListener);


        Thread uiThread = new HandlerThread("UIHandler"){
            public synchronized void run(){

                //stuff
                }

            }

        };
        uiThread.start();

    } 

LocationListener:

public class MyLocationListener implements LocationListener
{
    @Override
    public void onLocationChanged(Location loc)
    {

        location = new Location(loc);

    }

Answer 1

I used @nininho suggestion but I called Looper.prepare() just before I called requestLocationUpdates() in my LocationHandler class. I also had to call Looper.loop() just after I called the Thread otherwise the Thread wouldn’t even run.