android - onLocationChanged not called on some devices -

this question has been asked numerous times not find solution works.

i developing application using fused location provider. in onconnected() method, requesting location updates , application logic initiated once location fix generated , onlocationchanged() called. (please refer code below).

problem onlocationchanged() method never called on devices. use samsung tab 2 , samsung galaxy grand testing. code works fine on tab 2 not work on grand. not work, mean locationclient gets connected onlocationchanged() never called.

earlier, used location manager getting location , in implementation, same problem occurred. so, tried implementing fused location provider still same problem.

can me out issue? there missing here?

public class mainactivity extends activity implements googleplayservicesclient.connectioncallbacks, onconnectionfailedlistener, locationlistener {  locationclient locationclient; locationrequest lr; location loc1; static string address;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);           locationclient = new locationclient(this,this,this);     locationclient.connect();          }  @override public void onconnected(bundle arg0) {     // todo auto-generated method stub      lr=locationrequest.create();     lr.setinterval(100);     locationclient.requestlocationupdates(lr, this);     log.d("locationclient","on connected"); }  @override public void ondisconnected() {     // todo auto-generated method stub     locationclient.disconnect();  }  @override public void onconnectionfailed(connectionresult arg0) {     // todo auto-generated method stub  }  @override public void onlocationchanged(location loc) {     // todo auto-generated method stub            // application logic              log.d("locationclient","last known location lc:" + loc.getlatitude() + "," + loc.getlongitude()); } } 

i observed same behavior on galaxy nexus , recognized 2 things causing onlocationchanged() not being called. there are

1. corresponding location source not enabled in system settings. priority_high_accuracy gps satellites must enabled, priority_balanced_power_accuracy wi-fi & mobile network location must enabled.

2. even enabled location sources there can no valid location information available. instance, priority_high_accuracy source enabled, there no (or not good) gps reception (e.g. device inside building). or priority_balanced_power_accuracy source enabled, both wi-fi , mobile data switched off. in cases location cannot detected , onlocationchanged() not called.

to fix #1 had check whether required location sources enabled before connecting google services api , if switched off, notified user asked him/her allow location access.

to solve #2 decided use locationrequest.setexpirationduration(). set timeout @ 10 seconds, , after calling requestlocationupdates() post callback delayed same 10 seconds. if delayed callback called before requestlocationupdates(), means location cannot detected due reason #2. 3 retries , show user error message.

android documentation not great @ place, that's why hope helps.