android - GPS Location Always Shows Location as zero -


i sending location of user email on button click. doinbackground of asynctask given below.

@override protected boolean doinbackground(string... arg0) {     // todo auto-generated method stub     boolean status = false;     try {     double latitude=0;     double longitude=0;     gpstracker gps=new gpstracker(mainactivity.this);     if(gps.cangetlocation()){         latitude=gps.getlatitude();         longitude=gps.getlongitude();     }     string mapurl= "https://www.google.co.in/maps/@"+latitude+","+longitude+",17z";     gmailsender sender = new gmailsender(         "myemail@gmail.com", "password",         getapplicationcontext());     status = sender.sendmail(" subject ", "\nlocation : "+mapurl,"myemail@gmail.com",          "anothermail@gmail.com");     } catch (exception e) {     }     return status; }

but returns location 0,0

gpstracker.java

locationmanager = (locationmanager) mcontext     .getsystemservice(location_service); // getting gps status isgpsenabled = locationmanager     .isproviderenabled(locationmanager.gps_provider); // getting network status isnetworkenabled = locationmanager     .isproviderenabled(locationmanager.network_provider); if (!isgpsenabled && !isnetworkenabled) {     // no network provider enabled     } else {     this.cangetlocation = true;     if (isnetworkenabled) {         locationmanager.requestlocationupdates(             locationmanager.network_provider,             min_time_bw_updates,             min_distance_change_for_updates, this);         log.d("network", "network enabled");         if (locationmanager != null) {             location = locationmanager                                 .getlastknownlocation(locationmanager.network_provider);             if (location != null) {                 latitude = location.getlatitude();                 longitude = location.getlongitude();             }         }     }     // if gps enabled lat/long using gps services     if (isgpsenabled) {         locationmanager.requestlocationupdates(         locationmanager.gps_provider,                                             min_time_bw_updates,             min_distance_change_for_updates, this);         log.d("gps", "gps enabled");         if (locationmanager != null) {             location = locationmanager                 .getlastknownlocation(locationmanager.gps_provider);             if (location != null) {                 latitude = location.getlatitude();                 longitude = location.getlongitude();             }         }     } }

the log shows

05-16 22:01:30.449: w/system.err(12459): java.lang.runtimeexception: can't create handler inside thread has not called looper.prepare() 05-16 22:01:30.489: w/system.err(12459): @ android.os.handler.<init>(handler.java:121) 05-16 22:01:30.489: w/system.err(12459): @ android.location.locationmanager$listenertransport$1.<init>(locationmanager.java:198) 05-16 22:01:30.489: w/system.err(12459): @ android.location.locationmanager$listenertransport.<init>(locationmanager.java:198) 05-16 22:01:30.499: w/system.err(12459): @ android.location.locationmanager._requestlocationupdates(locationmanager.java:604) 05-16 22:01:30.499: w/system.err(12459): @ android.location.locationmanager.requestlocationupdates(locationmanager.java:471) 05-16 22:01:30.509: w/system.err(12459): @ com.package.utils.gpstracker.getlocation(gpstracker.java:65) 05-16 22:02:07.309: w/system.err(12459): @ com.package.utils.gpstracker.getlocation(gpstracker.java:65) 05-16 22:02:07.309: w/system.err(12459): @ com.package.utils.gpstracker.<init>(gpstracker.java:44) 05-16 22:02:07.309: w/system.err(12459):    @ com.webnamaste.ulrasoundindia.mainactivity$sendmailtask.doinbackground(mainactivity.java:255) 05-16 22:02:07.319: w/system.err(12459): @ com.package.ulrasoundindia.mainactivity$sendmailtask.doinbackground(mainactivity.java:1) 05-16 22:02:07.319: w/system.err(12459): @ android.os.asynctask$2.call(asynctask.java:264) 05-16 22:02:07.319: w/system.err(12459): @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:305) 05-16 22:02:07.319: w/system.err(12459): @ java.util.concurrent.futuretask.run(futuretask.java:137) 05-16 22:02:07.319: w/system.err(12459): @ android.os.asynctask$serialexecutor$1.run(asynctask.java:208) 05-16 22:02:07.339: w/system.err(12459): @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076) 05-16 22:02:07.339: w/system.err(12459): @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569) 05-16 22:02:07.349: w/system.err(12459): @ java.lang.thread.run(thread.java:856)

method doinbackground of asynctask executed on background thread, it's not main (ui) thread. here can have 3 solutions:

  1. move getting gps coordinates procedure onpreexecute , pass result doinbackground
  2. call runonuithread @ doinbackground invoking gpstracker, ugly solution.
  3. use combination of looper.prepare(); , looper.loop();

take here


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