public class LocationActivity extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback {

  // Sets the desired interval for active location updates. This interval is
  // inexact. You may not receive updates at all if no location sources are available, or
  // you may receive them slower than requested. You may also receive updates faster than
  // requested if other applications are requesting location at a faster interval.
  private static final int UPDATE_INTERVAL_MILLI_SECS = 1000;
  // Sets the fastest rate for active location updates. This interval is exact, and your
  // application will never receive updates faster than this value.
  private static final int FASTEST_UPDATE_INTERVAL_MILLI_SECS = 500;

  ...

  private LocationHelper locationHelper;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    locationHelper = new LocationHelper(this, new LocationConfig(UPDATE_INTERVAL_MILLI_SECS, FASTEST_UPDATE_INTERVAL_MILLI_SECS, LocationConfig.Priority.PRIORITY_HIGH_ACCURACY, true));
  }
}