LoginActivity.java

public class LoginActivity extends AppCompatActivity {
  private LoginViewModel loginViewModel;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ActivityLoginBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_login);
    loginViewModel = new LoginViewModel("", "");
    binding.setLoginViewModel(loginViewModel);
    binding.setHandler(loginViewModel);
  }    
}