android - Can't receive LocationClient's location updates after screen gone off -

i'm trying write simple android service runs in background , receives location updates locationclient (google map api android v2). problem when screen go off, service doesn't receives anymore location updates. tried check if service active, screen off, , (i have timertask scheduling log). when screen on can receive location updates, when screen goes off see timertask's logs , don't receive location update. waking screen turns on location updates again. how can solved?

here simple service:

public class locationservice extends service implements googleplayservicesclient.connectioncallbacks, googleplayservicesclient.onconnectionfailedlistener, locationlistener{  private static final string tag = locationservice.class.getsimplename();  private locationclient mlocationclient;  private timer timer; private static final locationrequest request = locationrequest.create()           .setinterval(5*1000)      // 5 seconds           .setfastestinterval(3*1000) // 3 seconds           .setpriority(locationrequest.priority_high_accuracy);   @override public void oncreate() {     log.d(tag, "creating..");     mlocationclient = new locationclient(this, this, this);     timer = new timer(); }  @override public int onstartcommand(intent intent, int flags, int startid) {     log.d(tag, "starting..");     if(!mlocationclient.isconnected() || !mlocationclient.isconnecting()) {         log.d(tag, "connecting location client..");         mlocationclient.connect();     }     timer.scheduleatfixedrate(new timertask(){         @override         public void run() {             log.d(tag, "timertask executing");         }}, 0, 3*1000);     return start_sticky; }  @override public void onconnectionfailed(connectionresult result) {     log.d(tag, "connection failed..");     stopself(); }  @override public void onconnected(bundle bundle) {     system.out.println("connected ...");     mlocationclient.requestlocationupdates(request, this); }  @override public void ondisconnected() {     log.d(tag, "disconnected..");     stopself(); }  @override public ibinder onbind(intent arg0) {     throw new unsupportedoperationexception("not yet implemented"); }  @override public void onlocationchanged(location location) {     log.d(tag, "received location update"); }  @override public void ondestroy() {     log.d(tag, "destroying..");     timer.cancel();     mlocationclient.removelocationupdates(this); } } 

use wakelock

in onstartcommand

wl = ((powermanager)getsystemservice(context.power_service)).newwakelock(powermanager.partial_wake_lock, yourtag); wl.acquire(); 

in ondestroy

if (wl != null && wl.isheld()) {     wl.release(); }