java - No GPS Update retrieved? Problem in Code? -

i've got serious problem gps on nexus one: wrote kind of hello world gps, toast should displayed isn't :(

i don't know i'm doing wrong...maybe me getting work. here's code:

package gps.test;  import android.app.activity; import android.content.context; import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.widget.toast;  public class gps extends activity { private locationmanager lm; private locationlistener locationlistener;  /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);      // ---use locationmanager class obtain gps locations---     lm = (locationmanager) getsystemservice(context.location_service);      locationlistener = new mylocationlistener();      lm.requestlocationupdates(locationmanager.gps_provider, 100, 1,             locationlistener); }  private class mylocationlistener implements locationlistener {     @override     public void onlocationchanged(location loc) {         if (loc != null) {             toast.maketext(                     getbasecontext(),                     "location changed : lat: " + loc.getlatitude()                             + " lng: " + loc.getlongitude(),                     toast.length_short).show();         }     }      @override     public void onproviderdisabled(string provider) {         // todo auto-generated method stub     }      @override     public void onproviderenabled(string provider) {         // todo auto-generated method stub     }      @override     public void onstatuschanged(string provider, int status, bundle extras) {         // todo auto-generated method stub     } } } 

theoretically there should new toast every 100 milliseconds, shouldn't it? or @ least, when change position 1 meter!? i've no idea why doesn't. must admit i'm new topic, maybe i've missed something?

it great if give me hint :)

nice greetings, poeschlorn

the code looks correct me. note that:

    lm.requestlocationupdates(locationmanager.gps_provider, 100, 1,         locationlistener); 

this means have move phone more meter location updates , check done approximately every 0.1 second.

i suggest add logging statements in these functions:

  @override public void onproviderdisabled(string provider) {     // todo auto-generated method stub }  @override public void onproviderenabled(string provider) {     // todo auto-generated method stub }  @override public void onstatuschanged(string provider, int status, bundle extras) {     // todo auto-generated method stub } 

this know flow code taking. gps disabled e.g. , you'll not know within app.

and finally, remember remove listening locations in onpause (or when required). having app in background continuously getting location updates when not required huge drain battery.