React Native Location Module

1. Introduction

Eleme location (based on amap) react native module.

Native module based on:

• AMap Android sdk version: 3.5.0 .

• AMap iOS sdk version:

• AMapFoundationKit 1.3.3

• AMapLocationKit 2.2.0

2. Usage

2.1 Installation

Step 1

run npm install https://github.com/reactnativecomponent/react-native-amap-geolocation --save

2.2 Android Configuration

• android/setting.gradle

include ':react-native-amap-geolocation'
project(':react-native-amap-geolocation').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-amap-geolocation/android')

• android/app/build.gradle

compile project(":react-native-amap-geolocation")

• MainApplication.java

	@Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          ...,
          new AMapLocationReactPackage() // Add this line
      );
    }

• AndroidManifest.xml

Remember setting your custom amap key as follows!

 <!--高德地图SDK key设置-->
    <meta-data
        android:name="com.amap.api.v2.apikey"
        android:value="请填写您的key"/>
    <!--高德地图APS服务设置-->

2.3 iOS Configuration

• Drag ./node_modules/react-native-amap-geolocation/ios/ELMRNLocation.xcodeproj to your Main Project as a Library

• Add AMap SDK to your project. AMap official tutorial is here

• AppDelegate.m

...
#import <AMapFoundationKit/AMapFoundationKit.h> //引入高德地图核心包
...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

  [AMapServices sharedServices].apiKey = @"请填写您的key";
    ...
}
...

3. API

import EleRNLocation from 'react-native-amap-geolocation';

3.1 Start Location

EleRNLocation.startLocation(options);

The parameter for startLocation(options) can be varied on different platforms which is showed as following:

Android Options and Default Value

{
  accuracy: 'HighAccuracy', // BatterySaving(低功耗定位模式), DeviceSensors(仅设备定位模式), HighAccuracy(高精度模式)
  needAddress: true, // 设置是否返回地址信息
  onceLocation: false, // 是否只定位一次
  onceLocationLatest: false,//获取最近3s内精度最高的一次定位结果
  wifiActiveScan: true, // 设置是否强制刷新WIFI，默认为强制刷新,模式为仅设备模式(Device_Sensors)时无效
  mockEnable: false, // 设置是否允许模拟位置,默认为false，不允许模拟位置,模式为低功耗模式(Battery_Saving)时无效
  interval: 2000, // 设置定位间隔,单位毫秒,默认为2000ms
  httpTimeOut: 30000, // 设置联网超时时间(ms), 模式为仅设备模式(Device_Sensors)时无效,默认30000毫秒，建议超时时间不要低于8000毫秒,
  protocol:'http', //用于设定网络定位时所采用的协议，提供http/https两种协议,默认值http
  locationCacheEnable: false //true表示使用定位缓存策略；false表示不使用。默认是false
}

iOS Options and Default Value

{
  accuracy: 'kCLLocationAccuracyHundredMeters', // kCLLocationAccuracyHundredMeters, kCLLocationAccuracyBest, kCLLocationAccuracyNearestTenMeters,kCLLocationAccuracyKilometer,kCLLocationAccuracyThreeKilometers
  onceLocation: false, // 是否只定位一次,
  pausesLocationUpdatesAutomatically: true,//指定定位是否会被系统自动暂停。默认为YES
  allowsBackgroundLocationUpdates: false,//是否允许后台定位。默认为NO。只在iOS 9.0及之后起作用。设置为YES的时候必须保证 Background Modes 中的 Location updates 处于选中状态，否则会抛出异常
  locationTimeout: 10,//指定单次定位超时时间,默认为10s。最小值是2s。注意单次定位请求前设置
  reGeocodeTimeout: 5,//指定单次定位逆地理超时时间,默认为5s。最小值是2s。注意单次定位请求前设置
  locatingWithReGeocode: false,//连续定位是否返回逆地理信息，默认NO
  distanceFilter: 'kCLDistanceFilterNone'//设定定位的最小更新距离。默认为 kCLDistanceFilterNone 
}

More config options detail can he found here

3.2 Stop Location

EleRNLocation.stopLocation();

3.3 Destroy Location

EleRNLocation.destroyLocation();

3.4 Add Location Update Listener

EleRNLocation.addEventListener((data) => console.log('data', data));

Result Received from Event Listener

{
    "gpsStatus": -1, (Android only)
    "locationDetail": "", (Android only)
    "district": "", 
    "city": "", 
    "street": "", 
    "aoiName": "", 
    "poiName": "", 
    "province": "", 
    "locationType": 1, (Android only)
    "latitude": 36.669221634428474, 
    "altitude": 29.78, 
    "cityCode": "", 
    "streetNum": "", 
    "bearing": 0, (Android only)
    "accuracy": 1, (Android only)
    "horizontalAccuracy": 1, (iOS only)
    "verticalAccuracy": 1, (iOS only)
    "speed": 0, (Android only)
    "longitude": 117.0259247042361, 
    "adCode": "", 
    "country": "", 
    "address": ""
}

Result detail can be found here

tips: The k-v in the result maybe contains "", 0 since certain values are exclusive which are varied with different options.

Handling Errors

Location update listener will receiver error when there is something unexpected happened.

{
	errorCode: 2,
	errorInfo: 'WIFI信息不足 请到http://lbs.amap.com/api/android-location-sdk/abouterrorcode/查看错误码说明.'
}

Amap provide a full table of error code and it's detail info.

4. Example

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  View
} from 'react-native';

import EleRNLocation from 'react-native-amap-geolocation';


export default class LocationExample extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.android.js
        </Text>
        <Text style={styles.instructions}>
          Double tap R on your keyboard to reload,{'\n'}
          Shake or press menu button for dev menu
        </Text>
      </View>
    );
  }

  componentDidMount() {
    this.listener = EleRNLocation.addEventListener((data) => console.log('data', data));
    // for Android (iOS options is different)
    EleRNLocation.startLocation({
      accuracy: 'HighAccuracy',
      mockEnable: true,
      interval: 5000
    });
  }

  componentWillUnmount() {
    EleRNLocation.stopLocation();
    this.listener.remove();
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

AppRegistry.registerComponent('LocationExample', () => LocationExample);