得到lat和长从博览会位置在地图上取

问题描述 投票:0回答:1

我发现世博会的位置文档的代码:

state = {
location: null,
errorMessage: null,
};

componentWillMount() {
    if (Platform.OS === 'android' && !Constants.isDevice) {
  this.setState({
    errorMessage: 'Oops, this will not work on Sketch in an Android 
    emulator. Try it on your device!',
    });
    } else {
  this._getLocationAsync();
   }
  }

    _getLocationAsync = async () => {
      let { status } = await Permissions.askAsync(Permissions.LOCATION);
   if (status !== 'granted') {
      this.setState({
    errorMessage: 'Permission to access location was denied',
   });
   }

     let location = await Location.getCurrentPositionAsync({});
   this.setState({ location });
    };

  render() {
   let text = 'Waiting..';
   if (this.state.errorMessage) {
    text = this.state.errorMessage;
   } else if (this.state.location) {
    text = JSON.stringify(this.state.location);
    }

   return (
     <View style={styles.container}>
     <Text style={styles.paragraph}>{text}</Text>
       </View>
      );
      }
     }

通过返回我的纬度,经度,准确性时间戳和其他的东西工作正常,我。

可有人告诉我,我怎样才能得到我的坐标,并将其呈现在地图上?我想使用的纬度,经度的状态,并通过它从我的位置访问到该状态的值,以进一步把它放入的MapView的初始区域

人谁可以帮助?

location android-mapview expo
1个回答
1
投票

我知道这个答案是有点晚了,但万一有人通过它运行,这是我做的:

新增的区域属性状态:

state = {
    location: null,
    region: null,
    errorMessage: null,
};

在的getLocations,我翻译了getCurrentPositionAsync()调用的区域返回的定位对象:

getLocationAsync = async () => {
        let { status } = await Permissions.askAsync(Permissions.LOCATION);
        if (status !== 'granted') {
            this.setState({
                errorMessage: 'Permission to access location was denied',
            });
        }

        let location = await Location.getCurrentPositionAsync({});

        const region = {
            latitude: location.coords.latitude,
            longitude: location.coords.longitude,
            latitudeDelta: 1.0,
            longitudeDelta: 1.0
        }

        this.setState({ location, region });
    };

终于在渲染方法我用过的状态下的区域属性设置区域中的MapView:

render() {
        return (
            <MapView
                initialRegion={this.state.region}
            />
        );
    }

一旦异步调用,以获得位置完成后,地图跳转到当前位置。

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