android - Firebase database data retrieving -Java -

here db structure:

code used data reading:

user="hrcj7"; mdatabase = firebasedatabase.getinstance().getreference().child("user");                                         query phonequery = mdatabase.orderbychild(user);                                         phonequery.addchildeventlistener(new childeventlistener() {                                             @override                                             public void onchildadded(datasnapshot datasnapshot, string prevchildkey) {                                                 user dinosaur = datasnapshot.getvalue(user.class);                                                 system.out.println(datasnapshot.getkey() + " " + dinosaur.getemail() + " meters tall.");                                             }                                              @override                                             public void onchildchanged(datasnapshot datasnapshot, string s) {                                              }                                              @override                                             public void onchildremoved(datasnapshot datasnapshot) {                                              }                                              @override                                             public void onchildmoved(datasnapshot datasnapshot, string s) {                                              }                                               @override                                             public void oncancelled(databaseerror databaseerror) {                                                 log.e("app", "oncancelled", databaseerror.toexception());                                             }                                         }); 

this datasnapsshot value after retrieving:

datasnapshot {     key = hrcj7,     value = {         -kh2-joegxcor-ve3ud5={             username=hrcj7,             email=rperera723@gmail.com,             imageurl=https://firebasestorage.googleapis.com/v0/b/freelancer-33195.appspot.com/o/blog_images%2fcropped933315999.jpg?alt=media&token=7890f05f-87db-4a9d-9534-02da00225470         }     } } 

this model class:

public class user {               public string email;             public string imageurl;             public string username;              public user(string email,string imageurl,string username) {                  this.email = email;                 this.imageurl=imageurl;                 this.username=username;             }              public string getemail() {                 return email;             }              public void setemail(string email) {                 this.email = email;             }              public string getimageurl() {                 return imageurl;             }              public void setimageurl(string imageurl) {                 this.imageurl = imageurl;             }              public string getusername() {                 return username;             }              public void setusername(string username) {                 this.username = username;             }      public user() {             // default constructor required calls datasnapshot.getvalue(user.class)         }          } 

my problem dinosaur.getemail() null after retrieving value. can issue? in advance.

here found solution .

in line:

user dinosaur = datasnapshot.getvalue(user.class); 

should replaced following:

string key = mdatabase.child("user").child(user).push().getkey(); user dinosaur = datasnapshot.child(key).getvalue(user.class);