android - React Native - how to create a background service -

i looking forward switch app rect-native native. have app track user's gps location when application closed. how can achieve in react native.

i had headless js , tried following , doesn't work

in manifest

<application> ... <service android:name="com.backgroundservice" /> ... </application> 

index.android.js

appregistry.registercomponent('geolocation', () => geolocation); appregistry.registerheadlesstask('sometaskname', () => require('./sometaskname')); 

sometaskname.js

import socketioclient 'socket.io-client'; module.exports = async (taskdata) => {     // stuff     var socket = socketioclient('http://xxx.xx.xx.xx:4000');     socket.emit("test"); } 

backgroundservice.java

package com;  import android.content.intent; import android.os.bundle; import android.support.annotation.nullable;  import com.facebook.react.headlessjstaskservice; import com.facebook.react.bridge.arguments; import com.facebook.react.jstasks.headlessjstaskconfig; public class backgroundservice extends headlessjstaskservice {    @override   protected @nullable   headlessjstaskconfig gettaskconfig(intent intent) {     bundle extras = intent.getextras();     if (extras != null) {       return new headlessjstaskconfig(           "sometaskname",           arguments.frombundle(extras),           5000);     }     return null;   } } 

mainactivity.java

package com.geolocation;  import android.content.intent; import android.os.bundle; import android.os.persistablebundle; import android.support.annotation.nullable;  import com.backgroundservice; import com.facebook.react.reactactivity;  public class mainactivity extends reactactivity {      @override     public void oncreate(@nullable bundle savedinstancestate, @nullable persistablebundle persistentstate) {         super.oncreate(savedinstancestate, persistentstate);         intent service = new intent(getapplicationcontext(), backgroundservice.class);         this.startservice(service);     }      /**      * returns name of main component registered javascript.      * used schedule rendering of component.      */      @override     protected string getmaincomponentname() {         return "geolocation";     } } 

you don't pass data service intent when start it,so in backgroundservice.java, extras null, , gettaskconfig method return null. see headlessjstaskservice.java, no task start when gettaskconfig return null.