Android, checking if login credentials are filled

check login credentials

public class LoginActivity extends AppCompatActivity implements View.OnClickListener, TextWatcher {

    userData user;
    private Button mLoginButton;
    private EditText mLoginID;
    private EditText mLoginPW;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    mLoginID = findViewById(R.id.loginEdit);
        mLoginPW = findViewById(R.id.passwordEdit);
        mLoginID.addTextChangedListener(this);
        mLoginPW.addTextChangedListener(this);

        mLoginButton =(Button)findViewById(R.id.loginButton);
        mLoginButton.setEnabled(false);
    }
    
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        mLoginButton.setEnabled(mLoginID.getText().length() > 0 && mLoginPW.getText().length() > 0);
    }

    @Override
    public void afterTextChanged(Editable editable) {

    }

    @Override
    public void onClick(View view) {
    }
}