java - Sending GPS Coordinates via sms -

i new android. trying develop app fetch users current gps coordinates , send them via sms hardcoded number. using 2 activities, first 1 has progress bar , text( processing, please wait),it fetching gps coordinates in background. second 1 receiving coordinates first activity , sending sms. problem m facing in mainactivity.java file condition if(latitude>0) never satisfied since gps take time coordinates , cant go second activity. m attaching code, please me on this. can edit code if u like. in advance.

package com.shaji.smartcab;  import com.shaji.smartcab.mainactivity; import com.shaji.smartcab.mylocationlistener; import com.shaji.smartcab.r;   import android.os.bundle; import android.app.activity;  import android.view.menu; import android.widget.textview; import android.widget.toast; import android.location.locationlistener;  import android.content.context; import android.content.intent; import android.location.locationmanager;   public class mainactivity extends activiy{ double lat; double lon; string coordinates; string coor;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      textview tv= (textview) findviewbyid(r.id.textview1);                locationmanager mlocmanager=null;                locationlistener mloclistener;                mlocmanager = (locationmanager)getsystemservice(context.location_service);                mloclistener = new mylocationlistener();               mlocmanager.requestlocationupdates( locationmanager.gps_provider, 600,10, mloclistener);             if (mlocmanager.isproviderenabled(locationmanager.gps_provider)) {                      if(mylocationlistener.latitude>0) {                 lat = mylocationlistener.latitude;                 lon = mylocationlistener.longitude;                 tv.settext("m fetching coordinates");                  coordinates= lat+","+lon;        intent intent = new intent(mainactivity.this, sec.class);       intent.putextra(coor, coordinates);       startactivity(intent);                       //tv1.settext("latitude:" + mylocationlistener.latitude +  ",longitude:" + mylocationlistener.longitude );                  }}                   else {                      context context = getapplicationcontext();                    charsequence text = "please turn on gps , try again later!";                    int duration = toast.length_short;                     toast toast = toast.maketext(context, text, duration);                    toast.show();                     tv.settext(" ");                }          };  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }} 

enter code herepackage com.shaji.smartcab;

import android.location.location;   import android.location.locationlistener;   import android.os.bundle;    public class mylocationlistener implements locationlistener {    public static double latitude;   public static double longitude;  @override   public void onlocationchanged(location loc)   {        loc.getlatitude();       loc.getlongitude();       latitude=loc.getlatitude();       longitude=loc.getlongitude();   }    @override   public void onproviderdisabled(string provider)   {       //print "currently gps disabled";   }   @override   public void onproviderenabled(string provider)   {       //print "gps got enabled";   }   @override   public void onstatuschanged(string provider, int status, bundle extras)   {   }   }      //this second activity. package com.shaji.smartcab; import com.shaji.smartcab.r;  import android.app.activity; import android.os.bundle; import android.telephony.smsmanager; import android.view.view; import android.widget.button; import android.widget.toast;  public class sec extends activity {  @override protected void oncreate(bundle savedinstancestate) {     // todo auto-generated method stub     super.oncreate(savedinstancestate);     setcontentview(r.layout.second);        final string sms = (string) getintent().getextras().get("coor");     button c = (button) findviewbyid(r.id.button1);     c.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view arg0) {              string phoneno = "03136166588";                //string sms = "coordinates";                 try {                                        smsmanager smsmanager = smsmanager.getdefault();                                         smsmanager.sendtextmessage(phoneno, null, sms, null, null);                                         toast.maketext(getapplicationcontext(), "request sent!",                                                 toast.length_long).show();                                     } catch (exception e) {                                         toast.maketext(getapplicationcontext(),                                                 " error, please try again later!",                                                 toast.length_long).show();                                         e.printstacktrace();          }          }});   }} 

i think problem is, location update not done before call next activity.

before updates, co-ordinates using 1 of 3 providers. refer following code.

private location getuserlocation() {  location_manager = (locationmanager) getsystemservice(location_service); if (location_manager != null) {     list<string > provider=location_manager .getallproviders();             location location = null;             for(int i=0;i<provider.size();i++){                  location=location_manager .getlastknownlocation(provider.get(i));                  if(location!=null){                           location_manager.requestlocationupdates(provider.get(i),                                                     min_time_bw_updates,                                                     min_distance_change_for_updates,mloclistener);                        break;                       }             }   return location;  } }