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automatic refresh api access token with retrofit and okhttp authenticator. this tutorial will be tell how to use okhttp authenticator with retrofit. this authenticator method is usefull when we having a case like : re-authorization without a user interaction (login)requesting new api access token with refresh tokenthis tutorial will cover the second case (access token dan refresh token) which is commonly use. the case will have scenario like this : normal api request.when token or api key expired, api will return 401.okhttp authenticator will intercept the process.okhttp authenticator will requesting new token with refresh token.new token receive and api request will be reloaded automatically.so, first create apiadapter clas* which is a clas* that contain retrofit singleton. in this clas* add method getadapter(). public clas* apiclient {     public static retrofit getadapter() {         if (retrofit==null) {            final okhttpclient.builder httpclient = new okhttpclient.builder();            httpclient.addinterceptor(new interceptor() {           here is easy step to change your location of composer vendor folder open composer.json  and add this scriptconfig: { vendor-dir:. how to add host ip address on android virtual device (avd) or genymotion using android studio. before creating this service if you have requesting location update on the other part of your app, make sure you call removelocationupdate(). so the service can get the right location update. locationservices.fusedlocationapi.removelocationupdates(googleapiclient, context);public clas* locationtrackingservice extends service implements locationlistener, googleapiclient.connectioncallbacks, googleapiclient.onconnectionfailedlistener{ protected googleapiclient googleapiclient; @override public void oncreate() { } @override public int onstartcommand(intent intent, int flags, int startid) { if(googleapiclient != null && !googleapiclient.isconnected()) googleapiclient.connect(); else if(googleapiclient == null) {