getLocation method
只定位一次
Implementation
Future<Location> getLocation(LocationClientOptions options) {
L.p('getLocation dart端参数: options.toJsonString() -> ${options.toJsonString()}');
_locationChannel.invokeMethod('location#startLocate', {'options': options.toJsonString()});
return _locationEventChannel.receiveBroadcastStream().map((result) => result).map((resultJson) => Location.fromJson(jsonDecode(resultJson))).first;
}