startLocate method
开始定位, 返回定位 结果流
Implementation
Stream<Location> startLocate(LocationClientOptions options) {
L.p('startLocate 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)));
}