Android - Firebase; on signing in, retrieve data (layered) and redirect that user based on that data -

so have simple firebase android application, i'm aiming cater number of different users. user registers, , on creation, uid stored in user table, along userinformation entry under uid values 'usertype' , 'iscurrentlytracking'. user signs in, brought profile activity can press button continue on through app. here table structure:

on pressing continue, userinformation data retrieved. based on data, redirected activity. instead of doing aforementioned, application stops/crashes.

here code/method redirects user:

public void userredirect(){      firebaseauth = firebaseauth.getinstance();     user = firebaseauth.getcurrentuser();      final firebasedatabase database = firebasedatabase.getinstance();      query q = database.getreference("users/" + user.getuid() + "/userinformation");      q.addvalueeventlistener(new valueeventlistener() {         @override         public void ondatachange(datasnapshot datasnapshot) {             (datasnapshot postsnapshot: datasnapshot.getchildren()) {                 userinformation ui = datasnapshot.getvalue(userinformation.class);                 int usertype = ui.getusertype();                 boolean ict = ui.gettrackingstatus();                  if ((usertype == 1) && (!ict)) {                      finish();                     startactivity(new intent(profileactivity.this, allocationactivity.class));                 }             }         }          @override         public void oncancelled(databaseerror databaseerror) {             databaseerror.getmessage();         }     }); } 

i have been able retrieve data before, although information not stored in 'users' table (only under user's uid), nor did userinformation descend uid.

for context, here user class:

public int usertype; public boolean iscurrentlytracking;  public userinformation(int usertype, boolean iscurrentlytracking){     this.usertype = usertype;     this.iscurrentlytracking = iscurrentlytracking; }  public int getusertype() {     return usertype; }  public boolean gettrackingstatus() {     return iscurrentlytracking; } 

any ideas on might going wrong? thank in advance.

i suggest use firebaseui authentication , reference uid. suggest don't use "+" concatenate firebase paths. try instead:

private databasereference databasereference;  ...  databasereference databasereference = firebasedatabase.getinstance().getreference().child(firebaseauth                 .getinstance().getcurrentuser().getuid()).getref(); 

and add listener this:

listener = new valueeventlistener() {         @override         public void ondatachange(datasnapshot datasnapshot) {             (datasnapshot snapshot : datasnapshot.getchildren()) {                 // handle userinformation here             }         }          @override         public void oncancelled(databaseerror databaseerror) {          }     };  databasereference.addvalueeventlistener(listener); 

the reason prefer separating instead of overriding inside method can following in ondestroy:

@override     protected void ondestroy() {         super.ondestroy();         databasereference.removeeventlistener(listener);     } 

keeping databasereference , listener member variables makes easier.

also, sure set appropriate firebase rules hardening users access data:

{   "rules": {     "$uid": {         ".write": "$uid === auth.uid",         ".read": "$uid === auth.uid",     }   } } 

for more complete example, check out todo list app made uses same database organization pattern here. hope able help, feel free comment if have other questions or if unclear.