FirebaseDatabase error: failed to convert Hashmap to String in Android app, how to fix?

Question

Java

Can't get child value via ValueEventListener.
Error:
My FirebaseDatabase:
Code:

DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
        DatabaseReference ref = databaseReference.child(path);

        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                String value = dataSnapshot.getValue(String.class);

                ClipboardManager clipboard = (ClipboardManager) getApplicationContext().getSystemService(CLIPBOARD_SERVICE);
                clipboard.setText(value);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {


            }

Swears exactly on the line

String value = dataSnapshot.getValue(String.class);

It is worth noting that with this code:

DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
            DatabaseReference ref = databaseReference.child(path);

            ClipboardManager clipboard = (ClipboardManager) getApplicationContext().getSystemService(CLIPBOARD_SERVICE);

            String data = clipboard.getText().toString();
            ref.setValue(data);

everything is in order, although the DatabaseReference are the same. I can not understand what the problem is, I will be grateful for the help.

Answer 1

data is not a string, but a hashmap, as they write to you in the logs.

Answer 2

I have one word for you: debugger.
and soon a lot will become clear!

Answer 3

Firebase returns hashmap with one line
Key: uzmtn
Value: data
If you need a line at once, then it's like this:

DatabaseReference ref = databaseReference.child(path).child("uzmtn");