Android development - GPS not working - Application hangs when co-ordinates sent -

problem background:

i new android development. i'm trying do, now, gps coordinates gps device of phone , display them on google maps or in textview, or whatever. main task them.

i've read number of tutorials. i'm using
- android 2.3.3
- api level 10
- eclipse 3.6.1
- windows 7

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problem description :

i have written class geoupdatehandler implements locationlistener , implements methods onlocationchange() etc. , in mymapsactivity, use regular requestlocationupdates of locationmanager periodic updates.

when run application, send gps coordinates emulator control of eclipse (window --> show view --> other --> android --> emulator control) send longitude , latitude. emulated device gets coordinates, application hangs. nothing happens , cursor changes blue circle (which signifies thinking/stuck) , nothing happens. if use locationmanager.getlastknownlocation(string provider), gets null. obviously, because there no last known location. gets stuck before knowing one!

i have tried sending coordinates through telnet well. (cmd --> telnet localhost 5554 --> geo fix . same thing happens.

i have tried starting device independent of application, sending coordinates, , starting application. same thing happens when run application: hangs.

the following code helloitemizedoverlay taken android's mapview tutorial , works fine manually given coordinates. problem arises when gps location tried retrieved.

public class mymapsactivity extends mapactivity  { private mapcontroller mapcontroller; private mapview mapview; private locationmanager locationmanager; linearlayout linlayout; mapview mview; list<overlay> mapoverlays; drawable drawable; helloitemizedoverlay itemizedoverlay; geoupdatehandler handler; location location; public void oncreate(bundle bundle) {     super.oncreate(bundle);     setcontentview(r.layout.main); // bind layout activity      mview = (mapview) findviewbyid(r.id.mapview);     mview.setbuiltinzoomcontrols(true);     mapoverlays = mview.getoverlays();     drawable = this.getresources().getdrawable(r.drawable.icon);     itemizedoverlay = new helloitemizedoverlay(drawable);      mapcontroller = mview.getcontroller();     locationmanager = (locationmanager) getsystemservice(context.location_service);     handler = new geoupdatehandler();     locationmanager.requestlocationupdates(locationmanager.gps_provider, 3000, 0, handler);      location = locationmanager.getlastknownlocation(locationmanager.gps_provider);      geopoint point = new geopoint((int)location.getlongitude(),(int)location.getlatitude());     overlayitem overlayitem = new overlayitem(point, "", "");      mview.setbuiltinzoomcontrols(true);     itemizedoverlay.addoverlay(overlayitem);      mapoverlays.add(itemizedoverlay);      mapcontroller.setzoom(8);     mapcontroller.animateto(point); }  @override protected boolean isroutedisplayed()  {     return false; }  public class geoupdatehandler implements locationlistener  {     @override     public void onlocationchanged(location location)      {         int lat = (int) (location.getlatitude());         int lng = (int) (location.getlongitude());         geopoint point = new geopoint(lat, lng);         mapcontroller.animateto(point); //  mapcontroller.setcenter(point);     }      @override     public void onproviderdisabled(string provider)      {      }      @override     public void onproviderenabled(string provider)      {      }      @override     public void onstatuschanged(string provider, int status, bundle extras)      {      } }  @override protected void onresume() {     handler = new geoupdatehandler();     locationmanager = (locationmanager) getsystemservice(context.location_service);     locationmanager.requestlocationupdates(locationmanager.gps_provider, 5000, 0, handler);     super.onresume(); } } 

according this, geopoint constructor takes (latitude * 1e6, longitude * 1e6) parameters ; whereas put (longitude, latitude) when calling getlastknownlocation, , forgot scale factor in other call (in onlocationchanged). latitude , logitude not scaled in location objects.

anyways, error should result in displaying blue map ((0,0) being in atlantic ocean), there may other problems.

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edit:

1/ in replay comment, if mix longitude , latitude, may unexisting point (latitude stays within [-90°,90°] whereas longitude can vary in [-180°,180°])

2/ there bug in sdk 2.3 (api level 9), makes emulator crash when sending mock locations. don't know wether true 2.3.3 (lvl 10), used 2.1u1 (lvl 7) test.

3/ following code works me :

package test.testmap;  import java.util.list;  import android.content.context; import android.graphics.drawable.drawable; import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.util.log; import android.widget.linearlayout;  import com.google.android.maps.geopoint; import com.google.android.maps.mapactivity; import com.google.android.maps.mapcontroller; import com.google.android.maps.mapview; import com.google.android.maps.overlay; import com.google.android.maps.overlayitem;  public class mymapsactivity extends mapactivity  {     private mapcontroller mapcontroller;     private locationmanager locationmanager;     linearlayout linlayout;     mapview mview;     list<overlay> mapoverlays;     drawable drawable;     helloitemizedoverlay itemizedoverlay;     geoupdatehandler handler;     location location;     public void oncreate(bundle bundle)     {         super.oncreate(bundle);         setcontentview(r.layout.main); // bind layout activity          drawable = this.getresources().getdrawable(r.drawable.icon);         itemizedoverlay = new helloitemizedoverlay(drawable);          mview = (mapview) findviewbyid(r.id.mapview);         mview.setbuiltinzoomcontrols(true);          mapoverlays = mview.getoverlays();         mapoverlays.add(itemizedoverlay);          mapcontroller = mview.getcontroller();     }      @override     protected boolean isroutedisplayed()      {         return false;     }      public class geoupdatehandler implements locationlistener      {         @override         public void onlocationchanged(location location)          {             log.d(this.getclass().getname(),"onlocationchanged : lat = "+location.getlatitude()+" lon = "+location.getlongitude());             int lat = (int) math.round(location.getlatitude()*1.0e6);             int lng = (int) math.round(location.getlongitude()*1.0e6);             geopoint point = new geopoint(lat, lng);             itemizedoverlay.addoverlay(new overlayitem(point, "", ""));             mapcontroller.animateto(point);             mapcontroller.setzoom(8);         }          @override         public void onproviderdisabled(string provider)          {             log.d(this.getclass().getname(),"onproviderdisabled");         }          @override         public void onproviderenabled(string provider)          {             log.d(this.getclass().getname(),"onproviderenabled");         }          @override         public void onstatuschanged(string provider, int status, bundle extras)          {             log.d(this.getclass().getname(),"onstatuschanged");         }     }      @override     protected void onresume()     {         handler = new geoupdatehandler();         locationmanager = (locationmanager) getsystemservice(context.location_service);         locationmanager.requestlocationupdates(locationmanager.gps_provider, 5000, 0, handler);         super.onresume();     } }