LocationTracker

@SuppressWarnings("MissingPermission")
public class LocationTracker implements LocationListener {

    private Context mContext;
    private LocationManager mLocationManager;
    private Callback mCallback;

    public LocationTracker(Context context, Callback callback) {
        this.mContext = context;
        this.mCallback = callback;
        updateListener();
    }

    @Override
    public void onLocationChanged(Location location) {
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        if (mCallback != null) mCallback.onChange(latitude, longitude);
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        updateListener();
    }

    @Override
    public void onProviderEnabled(String provider) {
        updateListener();
    }

    @Override
    public void onProviderDisabled(String provider) {
        updateListener();
    }

    public void removeUpdates() {
        mLocationManager.removeUpdates(this);
    }

    private void updateListener() {
        if (mContext == null) return;
        mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
        long time = (Prefs.getInstance(mContext).getTrackTime() * 1000) * 2;
        int distance = Prefs.getInstance(mContext).getTrackDistance() * 2;
        if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, time, distance, this);
        } else {
            mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, time, distance, this);
        }
    }

    public interface Callback {
        void onChange(double lat, double lon);
    }
}