android - GPS Co-ordinates app -

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i'm trying write simple gps co-ordinate app android keeps on crashing due nullpointerexception. code app looks code other gps co-ordinate apps , i'm struggling find error in code. nullpointerexception seems appear in onlocationchanged method when use following code: longtext.settext("longitude is: " + location.getlongitude()).

the message logcat "onlocationchanged entered" displayed in logcat therefore there location, in other words, (location != null) = true.

see below full code:

public class mainactivity extends activity implements locationlistener {      public locationmanager locationmgr;     private static final int min_time = 5000;     private static final int min_distance = 10;     public location currentlocation;     textview longtext;     textview lattext;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         longtext = (textview) findviewbyid(r.id.latitude);         lattext = (textview) findviewbyid(r.id.longitude);         locationmgr = (locationmanager) getsystemservice(context.location_service);         locationmgr.requestlocationupdates(locationmanager.gps_provider, min_time, min_distance, this);     }       @override         public void onresume() {             super.onresume();              try {                 /* defaulting place */                 location hardfix = new location("atl");                 hardfix.setlatitude(39.931261);                 hardfix.setlongitude(-75.051267);                 hardfix.setaltitude(1);                  try {                      location gps = locationmgr.getlastknownlocation(locationmanager.gps_provider);                     location network = locationmgr.getlastknownlocation(locationmanager.network_provider);                     if (gps != null) currentlocation = (gps);                     else if (network != null) currentlocation = (network);                     else currentlocation = (hardfix);                 } catch (exception ex2) {                     currentlocation = (hardfix);                 }                 onlocationchanged(currentlocation);             } catch (exception ex) {                 ex.printstacktrace();             }         }   @override     public void onlocationchanged(location location) {         // todo auto-generated method stub         if (location != null) {             log.i("location", "onlocationchanged entered");         longtext.settext("longitude is: " + location.getlongitude());         lattext.settext("latitude is: " + location.getlatitude());         }     }     public void onpause() {         super.onpause();         locationmgr.removeupdates(this);     }

my permissions in manifest:

<uses-permission android:name="android.permission.access_fine_location"/> <uses-permission android:name="android.permission.access_coarse_location"/> <uses-permission android:name="android.permission.internet"/>

my logcat:

03-22 14:35:49.695: i/location(13099): onlocationchanged entered 03-22 14:35:49.695: d/androidruntime(13099): shutting down vm 03-22 14:35:49.695: w/dalvikvm(13099): threadid=1: thread exiting uncaught exception (group=0x41df4700) 03-22 14:35:49.695: e/androidruntime(13099): fatal exception: main 03-22 14:35:49.695: e/androidruntime(13099): java.lang.nullpointerexception 03-22 14:35:49.695: e/androidruntime(13099):    @ com.example.gpscoord.mainactivity.onlocationchanged(mainactivity.java:75) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.location.locationmanager$listenertransport._handlemessage(locationmanager.java:255) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.location.locationmanager$listenertransport.access$000(locationmanager.java:184) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.location.locationmanager$listenertransport$1.handlemessage(locationmanager.java:200) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.os.handler.dispatchmessage(handler.java:99) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.os.looper.loop(looper.java:137) 03-22 14:35:49.695: e/androidruntime(13099):    @ android.app.activitythread.main(activitythread.java:5419) 03-22 14:35:49.695: e/androidruntime(13099):    @ java.lang.reflect.method.invokenative(native method) 03-22 14:35:49.695: e/androidruntime(13099):    @ java.lang.reflect.method.invoke(method.java:525) 03-22 14:35:49.695: e/androidruntime(13099):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1209) 03-22 14:35:49.695: e/androidruntime(13099):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1025) 03-22 14:35:49.695: e/androidruntime(13099):    @ dalvik.system.nativestart.main(native method) 03-22 14:35:51.430: i/process(13099): sending signal. pid: 13099 sig: 9

it's because have invoked onlocationchanged() in code. don't - it's callback. means driven system event, i.e. getting location fix.


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