android - get location requestLocationUpdates service? -


i try make locationing service somehow cant make work. lat , lng null.

i had exceptions on locmanager.requestlocationupdates(locationmanager.gps_provider, 0, 0, loclistener);

if (network_enabled) {             locmanager.requestlocationupdates(locationmanager.network_provider,0,0,loclistener);

my code :

package com.example.outmane.training;   import android.app.service; import android.content.context; import android.content.intent; import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.os.handler; import android.os.ibinder; import android.util.log; import android.widget.toast;  public class myservice extends service {     private locationmanager locmanager;     private locationlistener loclistener = new mylocationlistener();     static final double earth_radius = 6371.00;      private boolean gps_enabled = false;     private boolean network_enabled = false;      private handler handler = new handler();     thread t;      @override     public ibinder onbind(intent intent) {return null;}     @override     public void oncreate() {}     @override     public void ondestroy() {}     @override     public void onstart(intent intent, int startid) {}     @override     public int onstartcommand(intent intent, int flags, int startid){          toast.maketext(getbasecontext(), "service started", toast.length_short).show();          final runnable r = new runnable()         {   public void run()             {                 log.v("debug", "hello");                 location();                 handler.postdelayed(this, 5000);             }         };         handler.postdelayed(r, 5000);         return start_sticky;     }      public void location(){         locmanager = (locationmanager) getsystemservice(context.location_service);          try{             gps_enabled = locmanager.isproviderenabled(locationmanager.gps_provider);         }         catch(exception ex){}         try{             network_enabled = locmanager.isproviderenabled(locationmanager.network_provider);         }         catch(exception ex){}         log.v("debug", "in on create.. 2");         if (gps_enabled) {             locmanager.requestlocationupdates(locationmanager.gps_provider, 0, 0, loclistener);             log.v("debug", "enabled..");         }         if (network_enabled) {             locmanager.requestlocationupdates(locationmanager.network_provider,0,0,loclistener);             log.v("debug", "disabled..");         }         log.v("debug", "in on create..3");     }      private class mylocationlistener implements locationlistener     {         double lat_old=0.0;         double lon_old=0.0;         double lat_new;         double lon_new;         double time=10;         double speed=0.0;         @override         public void onlocationchanged(location location) {             log.v("debug", "in onlocation changed..");             if(location!=null){                 locmanager.removeupdates(loclistener);                 //string speed = "device speed: " +location.getspeed();                 lat_new=location.getlongitude();                 lon_new =location.getlatitude();                 string longitude = "longitude: " +location.getlongitude();                 string latitude = "latitude: " +location.getlatitude();                 double distance =calculationbydistance(lat_new, lon_new, lat_old, lon_old);                 speed = distance/time;                 toast.maketext(getapplicationcontext(), longitude+"\n"+latitude+"\ndistance is: "                         +distance+"\nspeed is: "+speed , toast.length_short).show();                 lat_old=lat_new;                 lon_old=lon_new;             }         }         @override         public void onproviderdisabled(string provider) {}         @override         public void onproviderenabled(string provider) {}         @override         public void onstatuschanged(string provider, int status, bundle extras) {}     }      public double calculationbydistance(double lat1, double lon1, double lat2, double lon2) {         double radius = earth_radius;         double dlat = math.toradians(lat2-lat1);         double dlon = math.toradians(lon2-lon1);         double = math.sin(dlat/2) * math.sin(dlat/2) +                 math.cos(math.toradians(lat1)) * math.cos(math.toradians(lat2)) *                         math.sin(dlon/2) * math.sin(dlon/2);         double c = 2 * math.asin(math.sqrt(a));         return radius * c;     }  }

try using fused loaction provider. take care of heavy stuff. , callbacks when location available.

http://developer.android.com/training/location/retrieve-current.html


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