mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            Location location = locationResult.getLastLocation();
            //...
        }
    };

    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

    mLocationRequest = new LocationRequest();

    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setInterval(TIME_TO_CHECK_LOCATION);
    mLocationRequest.setFastestInterval(TIME_TO_CHECK_LOCATION);
    mLocationRequest.setMaxWaitTime(TIME_TO_CHECK_LOCATION);

    mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, null);