How to check a child value in firebase and hide a button for that user logged in?

I want to hide a Button in my app when the user that is logged in has a specified value in the Realtime Firebase Database.

So I have a child where the value changes between Yes or No it depends on what rights the user is having. So I want to hide a Button when a user has the value No and when the user has the value Yes, it will be available.

My Firebase database structure is like this: (the child “hasusersstorage” is the Yes or No (Ja/Nei) Firebase structure

Here is the code I’ve tried but not managed to get it to work. The currentUser is working, because I use this to setText with a username that is logged in.

databaseUsers.child(currentUser).child("hasuserstorage").equalTo("Nei").addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            if (dataSnapshot.exists()) {

                if (dataSnapshot.hasChild("hasuserstorage")) {

                    bttoaddtool.setVisibility(View.GONE);
                }
            }
        }

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

        }
    });

Hope someone can help me out.

Answer

I want to hide a Button in my app when the user that is logged in has a specified value in the Firebase database.

If you want to achieve that, then you should create a reference that points exactly to the hasuserstorage field.

When you are using the following code query:

databaseUsers.child(currentUser).child("hasuserstorage").equalTo("Nei");

It doesn’t mean that you are checking if the hasuserstorage field of the logged-in user holds the value of Nei. Assuming that Ansatte is a direct child of your root node, to solve this, please use the following lines of code:

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference db = FirebaseDatabase.getInstance().getReference();
DatabaseReference hasUserStorageRef = db.child("Ansatte").child(uid).child("hasuserstorage");
hasUserStorageRef.get().addOnCompleteListener(new OnCompleteListener<DataSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DataSnapshot> task) {
        if (task.isSuccessful()) {
            DataSnapshot snapshot = task.getResult();
            if(snapshot.exists()) {
                String hasuserstorage = snapshot.getValue(String.class);
                if(hasuserstorage.equals("Ja")) {
                    Log.d("TAG", "hasuserstorage is Ja");
                    bttoaddtool.setVisibility(View.VISIBLE);
                } else if(hasuserstorage.equals("Nei")) {
                    Log.d("TAG", "hasuserstorage is Nei");
                    bttoaddtool.setVisibility(View.GONE);
                }
            }
        } else {
            Log.d("TAG", task.getException().getMessage()); //Never ignore potential errors!
        }
    }
});

The above code will hide the button if the hasuserstorage will hold the value of Nei, otherwise it will display it.