Save the Single Data INTO Firebase Database

   private FirebaseUser mCurrentUser;
    private DatabaseReference databaseReference;
    
     mstatus = findViewById(R.id.status_input);                           //textInputLayout with Edittext
        updateStatus_Btn = findViewById(R.id.status_save_btn);            //Status Change button
        
    //inside onCreate()
    mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();           //get currentUser info(UId) of Firebase Authentication
        String uid = mCurrentUser.getUid();                               //assign the currentUser info(UId) to Sting datatype
        databaseReference = FirebaseDatabase.getInstance().getReference().child("User").child(uid);//get references through current User uid from F_database for access data.


    updateStatus_Btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                
                String new_status = mstatus.getEditText().getText().toString();  //get text  from Edittext & asssign to new String variable
                    //save the data into database (status column) through database reference use
                databaseReference.child("status").setValue(new_status).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            
                            Toast.makeText(getApplicationContext(), "Successfull", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getApplicationContext(), "Can't change, please try again", Toast.LENGTH_SHORT).show();
                        }
                    }
                });

            }
        });