Android sequence task -

i have code

public class restaurantlistfragment extends listfragment {  arraylist<restaurant> restaurants; sqldatahelper datahelper; gpstracker gps;  public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     return inflater.inflate(r.layout.restaurant_list, null);  }  public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);      // uses call gps service . if not enable . display dialog user .     gps = new gpstracker(getactivity());     double userlatitude = gps.getlatitude();     double userlongitude = gps.getlongitude();      // want after user enable gps service . run code below .       toast.maketext(getactivity(), userlatitude + " " + userlongitude, toast.length_short).show();     datahelper = new sqldatahelper(getactivity(), "restaurantdb");     restaurants = new arraylist<restaurant>();     datahelper.opendb();     cursor cursor = datahelper.query("restaurant", new string[]{"id", "resname", "logo", "address", "latitude", "longitude"}, null             , null, null, null, null);     if (cursor.movetofirst()) {         {             restaurant restaurant = new restaurant();             restaurant.setid(cursor.getint(0));             restaurant.setresname(cursor.getstring(1));             restaurant.setlogo(cursor.getstring(2));             restaurant.setaddress(cursor.getstring(3));             restaurants.add(restaurant);         } while (cursor.movetonext());     }     //collections.sort(restaurants);     restaurantadapter restaurantadapter = new restaurantadapter(getactivity(),restaurants);     setlistadapter(restaurantadapter); } 

}

i want user enable gps first . after run database query code below . user must finish enable setting gps . , datahelper must wait finish setting gps task can run . can me ???

my gpstracker class

public class gpstracker extends service implements locationlistener{  private final context mcontext;  boolean isgpsenable = false; boolean isnetworkenable = false; boolean cangetlocation = false; location location; double latitude; double longitude;  private static final long min_distance_for_update = 10;             // 10 meters private static final long min_time_bw_update = 1000 * 60 * 1;       // 1 minute protected locationmanager locationmanager;  public gpstracker(context ctx) {     this.mcontext = ctx;     getlocation(); }  public location getlocation() {     try {         locationmanager = (locationmanager)mcontext.getsystemservice(location_service);         isgpsenable = locationmanager.isproviderenabled(locationmanager.gps_provider);         isnetworkenable = locationmanager.isproviderenabled(locationmanager.network_provider);         if(!isgpsenable)         {             showsettingsgpsalert();         }         else if(!isnetworkenable)         {             showsettingsnetworkalert();         }         else         {             this.cangetlocation = true;             if(isnetworkenable)             {                 locationmanager.requestlocationupdates(locationmanager.network_provider,                         min_time_bw_update,                         min_distance_for_update, this);                 log.d("network", "network");                 if (locationmanager != null) {                     location = locationmanager                             .getlastknownlocation(locationmanager.network_provider);                     if (location != null) {                         latitude = location.getlatitude();                         longitude = location.getlongitude();                     }                 }             }             if (isgpsenable) {                 if (location == null) {                     locationmanager.requestlocationupdates(                             locationmanager.gps_provider,                             min_time_bw_update,                             min_distance_for_update, this);                     log.d("gps enabled", "gps enabled");                     if (locationmanager != null) {                         location = locationmanager                                 .getlastknownlocation(locationmanager.gps_provider);                         if (location != null) {                             latitude = location.getlatitude();                             longitude = location.getlongitude();                         }                     }                 }             }         }      }catch (exception ex)     {         log.e("<<location error>>",ex.getmessage());     }     return location; }  public void stopusinggps(){     if(locationmanager != null){         locationmanager.removeupdates(gpstracker.this);     } }  public double getlatitude(){     if(location != null){         latitude = location.getlatitude();     }      // return latitude     return latitude; }  public double getlongitude(){     if(location != null){         longitude = location.getlongitude();     }      // return longitude     return longitude; }  public boolean cangetlocation() {     return this.cangetlocation; }  public boolean cangetgps() {     return this.isgpsenable; }  public boolean cangetnetwork() {     return this.isnetworkenable; }  public void showsettingsgpsalert(){     alertdialog.builder alertdialog = new alertdialog.builder(mcontext);      // setting dialog title     alertdialog.settitle("gps settings");      // setting dialog message     alertdialog.setmessage("gps not enabled. want go settings menu?");      // on pressing settings button     alertdialog.setpositivebutton("settings", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog,int which) {             intent intent = new intent(settings.action_location_source_settings);             mcontext.startactivity(intent);         }     });      // on pressing cancel button     alertdialog.setnegativebutton("cancel", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog, int which) {             dialog.cancel();         }     });      // showing alert message     alertdialog.show(); }  public void showsettingsnetworkalert(){     alertdialog.builder alertdialog = new alertdialog.builder(mcontext);      // setting dialog title     alertdialog.settitle("network settings");      // setting dialog message     alertdialog.setmessage("network not enabled. want go settings menu?");      // on pressing settings button     alertdialog.setpositivebutton("settings", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog,int which) {             intent intent = new intent(settings.action_network_operator_settings);             mcontext.startactivity(intent);         }     });      // on pressing cancel button     alertdialog.setnegativebutton("cancel", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog, int which) {             dialog.cancel();         }     });      // showing alert message     alertdialog.show(); }  @override public ibinder onbind(intent intent) {     return null;  //to change body of implemented methods use file | settings | file templates. }  @override public void onlocationchanged(location location) {     //to change body of implemented methods use file | settings | file templates. }  @override public void onstatuschanged(string provider, int status, bundle extras) {     //to change body of implemented methods use file | settings | file templates. }  @override public void onproviderenabled(string provider) {     //to change body of implemented methods use file | settings | file templates. }  @override public void onproviderdisabled(string provider) {     //to change body of implemented methods use file | settings | file templates. } 

}