相关疑难解决方法(0)

我已经在react-native中创建了地图,参考https://github.com/lelandrichardson/react-native-maps 地图已创建,但我想使用gps检测自动位置.以下是使用静态纬度和经度渲染地图的代码.这是我更新的代码.但它仍然没有呈现完美的位置

getInitialState() {
    return {
        initialPosition: 'unknown',
        lastPosition: 'unknown',
    };
  },

  componentDidMount() {
    navigator.geolocation.getCurrentPosition(
      (position) => {
        var initialPosition = JSON.stringify(position);
        this.setState({initialPosition});
      },
      {enableHighAccuracy: true, timeout: 20000, maximumAge: 1000}
    );
    this.watchID = navigator.geolocation.watchPosition((position) => {
      var lastPosition = JSON.stringify(position);
      this.setState({lastPosition});
    });
  },

  componentWillUnmount() {
    navigator.geolocation.clearWatch(this.watchID);
  },

  render() {
    return (
      <View style={styles.container}>
        <MapView
          ref="map"
          mapType="terrain"
          style={styles.map}
          initialPosition={this.state.initialPosition}
          lastPosition={this.state.lastPosition}
        >
        </MapView>
      </View>

你能纠正吗？

提前致谢

我需要在React-native Android上检测用户的地理位置,但是当前的实现仅支持iOS.我没有在任何地方找到任何教程或相关问题.

我试图为此创建自己的Android原生组件.我已经尝试使用模拟器(通过命令行设置一些坐标)和手机,但操作栏中没有gps图标,并且反应回调中没有数据.

我正在尝试立即获取最后一个已知位置,我也正在设置事件监听器以进行更新.

public class GeoLocation extends ReactContextBaseJavaModule implements
    GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

protected static final String TAG = "GeoLocation";
protected GoogleApiClient mGoogleApiClient;
protected Location mLastLocation;


public GeoLocation(ReactApplicationContext reactContext) {
    super(reactContext);
    buildGoogleApiClient();
}

@Override
public String getName() {
    return "GeoLocation";
}

protected synchronized void buildGoogleApiClient() {
    mGoogleApiClient = new GoogleApiClient.Builder(getReactApplicationContext())
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();
    mGoogleApiClient.connect();
}

@Override
public void onConnected(Bundle connectionHint) {

    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    //WritableMap params = Arguments.createMap();

    //Can I use ConcurrentHashMap instead of WritableMap?
    ConcurrentHashMap<String, String> params = …