fusedLocationClient.kt

// FusedLocationProviderClient - MainActivity class for receiving location updates.
private lateinit var fusedLocationProviderClient: FusedLocationProviderClient

// LocationRequest - Requirements for the location updates, i.e., how often you
// should receive updates, the priority, etc.
private lateinit var locationRequest: LocationRequest

// LocationCallback - Called when FusedLocationProviderClient has a new Location.
private lateinit var locationCallback: LocationCallback

override fun onCreate(savedInstanceState: Bundle?) {
    // ...

    fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
}