java - how get value from Firebase -


i new in android , want userids firebase database, i've tried using returns null.

  • by using code
  • value of constants.arg_chat_group_rooms=groups , constants.new_node=newgroup
    private void getmyuid() {     string senderuid = firebaseauth.getinstance().getcurrentuser().getuid();     databasereference mtest = firebasedatabase.getinstance().getreference();     mtest.child(constants.arg_chat_group_rooms).child(constants.new_node)             .child(senderuid).addlistenerforsinglevalueevent(new valueeventlistener() {         @override         public void ondatachange(datasnapshot datasnapshot) {         if (!datasnapshot.exists()){             toast.maketext(activitychatview.this, "not exist", toast.length_short).show();             log.e("151","acv"+datasnapshot);         }         }          @override         public void oncancelled(databaseerror databaseerror) {          }     });     log.e("139","acv"+senderuid);     }
  • database structure this

enter image description here

if want first 1 under 15052169227329_mygroupname_hell anne: problem forgot node before "constants.new_node"

private void getmyuid() {         string senderuid = firebaseauth.getinstance().getcurrentuser().getuid();         databasereference mtest = firebasedatabase.getinstance().getreference();         mtest.child(constants.arg_chat_group_rooms).child("15052169227329_mygroupname_hell anne").child(constants.new_node)                 .addlistenerforsinglevalueevent(new valueeventlistener() {             @override             public void ondatachange(datasnapshot datasnapshot) {                 if (!datasnapshot.exists()){                     toast.maketext(activitychatview.this, "not exist", toast.length_short).show();                     log.e("151","acv"+datasnapshot);                 }                  // can cast object later seems that string , not array                 object yourrequiredobject = datasnapshot.child("usersids").getvalue();             }              @override             public void oncancelled(databaseerror databaseerror) {              }         });         log.e("139","acv"+senderuid);     }

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