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ActivitySignUpBinding binding;

private FirebaseAuth mAuth;
FirebaseDatabase database;
ProgressDialog progressDialog;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    binding = ActivitySignUpBinding.inflate(getLayoutInflater());
    setContentView(binding.getRoot());

    mAuth = FirebaseAuth.getInstance();
    database = FirebaseDatabase.getInstance();


    getSupportActionBar().hide();
    ProgressDialog progressDialog = new ProgressDialog(SignUpActivity.this);
    progressDialog.setTitle("Creating Account");
    progressDialog.setMessage("We are creating your account. ");

    binding.btnSignUp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (!binding.txtUsername.getText().toString().isEmpty() && !binding.txtEmail.getText().toString().isEmpty() && !binding.txtPassword.getText().toString().isEmpty())
            {
                progressDialog.show();
                mAuth.createUserWithEmailAndPassword(binding.txtEmail.getText().toString(), binding.txtPassword.getText().toString());
                .addOnCompleteListener( new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                             if (task.isSuccessful())
                             {
                                 Users user = new Users(binding.txtUsername.getText().toString(),binding.txtEmail.getText().toString(),binding.txtPassword.getText().toString());
                                 String id = task.getResult().getUser().getUid();
                                 database.getReference().child("Users").child(id).setValue(user);
                            Toast.makeText(SignUpActivity.this, "Sign Up Successful", Toast.LENGTH_SHORT).show();
                            } else {
                            Toast.makeText(SignUpActivity.this, task.getException().toString(), Toast.LENGTH_SHORT).show();
                           }
                        }
                });
            } else {
                Toast.makeText(SignUpActivity.this, "", Toast.LENGTH_SHORT).show();
            }
        }

        private void addOnCompleteListener(OnCompleteListener<AuthResult> sign_up_successful) {
        }

    });
}