android - FusedLocationApi.getLastLocation returns null -

i have singleton location service

public class locationservice implements googleapiclient.connectioncallbacks,         googleapiclient.onconnectionfailedlistener, locationlistener {      public static final string tag = locationservice.class.getsimplename();      private static locationservice instance;     private locationrequest mlocationrequest;     private googleapiclient mgoogleapiclient;     public location location;     private context context;      private locationservice (context context) {          this.context = context;          mgoogleapiclient = new googleapiclient.builder(context)                 .addconnectioncallbacks(this)                 .addonconnectionfailedlistener(this)                 .addapi(locationservices.api)                 .build();          mgoogleapiclient.connect();          mlocationrequest = locationrequest.create()                 .setpriority(locationrequest.priority_high_accuracy)                 .setinterval(10 * 1000)        // 10 seconds, in milliseconds                 .setfastestinterval(60 * 1000); // 1 second, in milliseconds      }      public static locationservice getinstance(context context){          if (null == instance){             instance = new locationservice(context);         }         return instance;     }      @override     public void onconnected(bundle bundle) {         log.i(tag, "location services connected.");          if (activitycompat.checkselfpermission(this.context, manifest.permission.access_fine_location) != packagemanager.permission_granted && activitycompat.checkselfpermission(this.context, manifest.permission.access_coarse_location) != packagemanager.permission_granted) {             return;         }         location location = locationservices.fusedlocationapi.getlastlocation(mgoogleapiclient);          locationservices.fusedlocationapi.requestlocationupdates(mgoogleapiclient, mlocationrequest, this);          this.location = location;          if (location != null) {             log.d(tag, location.tostring());         }     }      @override     public void onconnectionsuspended(int i) {         log.i(tag, "location services suspended. please reconnect.");     }      @override     public void onconnectionfailed(connectionresult connectionresult) {         log.i(tag, "location services connection failed code " + connectionresult.geterrorcode());     }      public void onlocationchanged(location location) {          this.location = location;          log.i(tag, "location changed.");         log.i(tag, location.tostring());      } } 

i start in mainactivity calling in oncreate

locationservice locationservice = locationservice.getinstance(getapplicationcontext()); 

but location null , onlocationchanged doesnt called

onconnected being called, checked in debugger, location inside null

what do wrong ?

if last location null need register updates @ least 1 time first last location.

check documentation for "request location updates".