How does it work - requestLocationUpdates() + LocationRequest/Listener

You are implementing LocationListener in your activity MainActivity. The call for concurrent location updates will therefor be like this:

mLocationClient.requestLocationUpdates(mLocationRequest, this);

Be sure that the LocationListener you're implementing is from the google api, that is import this:

import com.google.android.gms.location.LocationListener;

and not this:

import android.location.LocationListener;

and it should work just fine.

It's also important that the LocationClient really is connected before you do this. I suggest you don't call it in the onCreate or onStart methods, but in onResume. It is all explained quite well in the tutorial for Google Location Api: https://developer.android.com/training/location/index.html

I use this one:

LocationManager.requestLocationUpdates(String provider, long minTime, float minDistance, LocationListener listener)

For example, using a 1s interval:

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);

the time is in milliseconds, the distance is in meters.

This automatically calls:

public void onLocationChanged(Location location) {    //Code here, location.getAccuracy(), location.getLongitude() etc...}

I also had these included in the script but didnt actually use them:

public void onStatusChanged(String provider, int status, Bundle extras) {}public void onProviderEnabled(String provider) {}public void onProviderDisabled(String provider) {}

In short:

public class GPSClass implements LocationListener {    public void onLocationChanged(Location location) {        // Called when a new location is found by the network location provider.        Log.i("Message: ","Location changed, " + location.getAccuracy() + " , " + location.getLatitude()+ "," + location.getLongitude());    }    public void onStatusChanged(String provider, int status, Bundle extras) {}    public void onProviderEnabled(String provider) {}    public void onProviderDisabled(String provider) {}    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);    }}