android - Unable to retrieve email address from Facebook API -

i getting null pointer exception while getting email address facebook api on android 3.0.

the code generating exception below:

loginbutton authbutton; authbutton = (loginbutton) findviewbyid(r.id.authbutton); // set permission list, don't forget add email authbutton.setreadpermissions(arrays.aslist("basic_info", "email")); authbutton.setsessionstatuscallback(new session.statuscallback() {     @override     public void call(session session, sessionstate state,                      exception exception) {         showtoast("inside call");         if (session.isopened()) {             showtoast("inside session");             system.out.println("facebook access token"                                + session.getaccesstoken());             fbtoken = session.getaccesstoken();             request.executemerequestasync(session,                                           new request.graphusercallback() {                                               @override                                               public void oncompleted(graphuser user,                                                                       response response) {                                                   if (user != null) {                                                       string email = user.asmap().get("email").tostring();                                                   }                                               }                                           });         }     } }); 

the code working - might have made mistake while integrating code.

you can user email graphuser object using property.

 user.getproperty("email").tostring() 

it works me.hoping work you.