MainActivity.kt

class MainActivity: FlutterActivity() {

  private val CHANNEL_GEOLOCATOR = "geolocator"

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    GeneratedPluginRegistrant.registerWith(this)

    MethodChannel(flutterView, CHANNEL_GEOLOCATOR).setMethodCallHandler(
            object : MethodCallHandler {
              override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
                val latitude: Double? = call.argument("latitude");
                val longitude: Double? = call.argument("longitude");

                if (latitude != null && longitude != null) {
                  result.success(getAddress(latitude, longitude));
                } else {
                  result.error("UNAVAILABLE", "Método não recebeu latitude e/ou longitude", null);
                }
              }
            })


  }

  fun getAddress(latitude: Double, longitude: Double): String{
    val geocoder: Geocoder = Geocoder(this)

    val listAddress = geocoder.getFromLocation(latitude, longitude, 1)

    val address = listAddress.get(0)

    return address.getAddressLine(0)
  }
}