Awesome

react-native-geo-fencing

Native modules to determine if a location is within defined geographical boundaries using Google Geometry library for ios and android.

Usage

import GeoFencing from 'react-native-geo-fencing';

// with navigator geolocation
componentDidMount() {
  const polygon = [
    { lat: 3.1336599385978805, lng: 101.31866455078125 },
    { lat: 3.3091633559540123, lng: 101.66198730468757 },
    { lat: 3.091150714460597,  lng: 101.92977905273438 },
    { lat: 2.7222113428196213, lng: 101.74850463867188 },
    { lat: 2.7153526167685347, lng: 101.47933959960938 },
    { lat: 3.1336599385978805, lng: 101.31866455078125 } // last point has to be same as first point
  ];

  navigator.geolocation.getCurrentPosition(
    (position) => {
      let point = {
        lat: position.coords.latitude,
        lng: position.coords.longitude
      };

      GeoFencing.containsLocation(point, polygon)
        .then(() => console.log('point is within polygon'))
        .catch(() => console.log('point is NOT within polygon'))
    },
    (error) => alert(error.message),
    { enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 }
  );
}

// with only point and polygon
componentDidMount() {
  const polygon = [
    { lat: 3.1336599385978805, lng: 101.31866455078125 },
    { lat: 3.3091633559540123, lng: 101.66198730468757 },
    { lat: 3.091150714460597,  lng: 101.92977905273438 },
    { lat: 3.1336599385978805, lng: 101.31866455078125 } // last point has to be same as first point
  ];

  let point = {
    lat: 2.951269758090068,
    lng: 101.964111328125
  };

  GeoFencing.containsLocation(point, polygon)
    .then(() => console.log('point is within polygon'))
    .catch(() => console.log('point is NOT within polygon'))
}

Installation

$ npm install --save react-native-geo-fencing

ios

Within ios/ directory of your react-native app:

1. Create a Podfile manually or simply

   $ pod init

# Podfile for cocoapods 1.0
platform :ios, '7.0'

target 'yourAppTarget' do
  pod 'React', path: '../node_modules/react-native'
  pod 'react-native-geo-fencing', path: '../node_modules/react-native-geo-fencing'
end

# for older version of CocoaPods
platform :ios, '7.0'

pod 'React', path: '../node_modules/react-native'
pod 'react-native-geo-fencing', path: '../node_modules/react-native-geo-fencing'

2. Then

    $ pod install
   

3. Add $(inherited) for Other Linker Flags to your project's build settings

4. Link the static library

android

1. Add the following to android/settings.gradle

include ':react-native-geo-fencing'
project(':react-native-geo-fencing').projectDir = new File(settingsDir, '../node_modules/react-native-geo-fencing/android')

2. Add the following to android/app/build.gradle

dependencies {
  // ...
  compile project(':react-native-geo-fencing')
}

3. Edit android/src/.../MainActivity.java

// ...
import com.surialabs.rn.geofencing.GeoFencingPackage;// <--

public class MainActivity extends ReactActivity {
    @Override
    protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
            new GeoFencingPackage() // <--
        );
    }
}

4. Enable access to location when using the app from your AndroidManifest.xml

   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />