无法使用xml和数据绑定启用按钮

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Click Me"
    android:enabled="@{viewModel.isButtonEnabled}" />

public class MyViewModel extends ViewModel {
    private MutableLiveData<Boolean> isButtonEnabled = new MutableLiveData<>();

    public MyViewModel() {
        isButtonEnabled.setValue(false);
    }

    public LiveData<Boolean> getIsButtonEnabled() {
        return isButtonEnabled;
    }

    public void setButtonEnabled(boolean enabled) {
        isButtonEnabled.setValue(enabled);
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        viewModel = new ViewModelProvider(this).get(MyViewModel.class);
        binding.setViewModel(viewModel);
        binding.setLifecycleOwner(this);
    }
}

public class BindingAdapters {
    @JvmStatic
    @BindingAdapter("android:enabled")
    public static void setEnabled(Button button, boolean enabled) {
        button.setEnabled(enabled);
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
    viewModel = new ViewModelProvider(this).get(MyViewModel.class);
    binding.setViewModel(viewModel);
    binding.setLifecycleOwner(this);
}