访问Firebase中快照的所有子值

Question

This is my Firebase Realtime Database. I want to read memberRollNo , and memberMobileNo of the node whose name(key) is equal to nname. I am only able to read memberRollNo with my code and Textview for memberMobileNo shows out to be blank.

 DBRef = FirebaseDatabase.getInstance().getReference();

    DBRef.child("Members").addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {


                String roll = dataSnapshot.child(nname).child("memberRollNo").getValue(String.class);
                DRollNo.setText(roll);


                String mob = dataSnapshot.child(nname).child("memberMobile").getValue(String.class);
                DMobile.setText(mob);


        }


        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });
}

DRollNo and DMobile are textview.

Answer 1

Change this:

String mob = dataSnapshot.child(nname).child("memberMobile").getValue(String.class);

into this:

 String mob = dataSnapshot.child(nname).child("memberPhone").getValue(String.class);

In your database, you do not have a child called memberMobile . The name inside the method child() needs to be the same as in the database to be able to retrieve it.