Retrieve Current User's Data (user_id) Firebase?

Question

        firebaseAuth = FirebaseAuth.getInstance();
        mDatabase = FirebaseDatabase.getInstance();
        mDb = mDatabase.getReference();
        Fireb         


        

Answer 1

It's simple. If you want to retrieve user data. Then you have to first select the child node in which you want to look for the user.

You have to Nodes Tunanetra and Orangtua

Else you can try this order by approach.

FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
        FirebaseDatabase mDatabase = FirebaseDatabase.getInstance();
        DatabaseReference mDb = mDatabase.getReference();
        FirebaseUser user = firebaseAuth.getCurrentUser();
        String userKey = user.getUid();

        //First Approach
        mDb.child("Tunanetra").child(userKey).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                String userID = String.valueOf(dataSnapshot.child("user_id").getValue());
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

        //Second Approach
        mDb.child("Tunanetra").orderByChild("email").equalTo(user.getEmail()).limitToFirst(1).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                if(dataSnapshot.getChildrenCount()>0){
                    for(DataSnapshot data : dataSnapshot.getChildren()){
                        String userID = String.valueOf(data.child("user_id").getValue());
                    }
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });