How to delete value from the database which is entered into my textView after pressing delete button?

I want to delete the TextView string value from the firebase database which after deleting will return the value as true. How can we then integrate more qr code values under the same key qrCode as shown in the image below.

Image for database :

Basically a qr code scanner will be inbuilt in this app which will give us the string value in TextView field which we want to verify with our database on firebase.

package com.vidmun.dhananjay.qrscanner;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.view.View;
import android.widget.Button;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;


public class MainActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button delete = (Button) findViewById(R.id.delete);
        TextView qrCode = (TextView) findViewById(R.id.qrCode);


        delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mainTest();
                //Toast.makeText(getApplicationContext() , "Pressed", Toast.LENGTH_LONG).show();

            }
        });
    }

    public void mainTest() {
        final TextView qrCode = (TextView) findViewById(R.id.qrCode);
        final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference("qrCode");
         rootRef.child("qrCode").orderByChild("data").equalTo(String.valueOf(qrCode)).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot.hasChild("qrCode/data")) {
                    dataSnapshot.getRef().removeValue();
                    Toast.makeText(getApplicationContext() , "Done", Toast.LENGTH_LONG).show();

                }else{
                    Toast.makeText(getApplicationContext() , "Not Done", Toast.LENGTH_LONG).show();
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                throw databaseError.toException();
            }
        });

    }

}

The expected output is the execution of the if condition but else condition is being executed.