在Android片段中不显示TextView中的设置值

TextView textView = findViewById(R.id.textViewId);

<!-- res/layout/activity_main.xml -->
<TextView
    android:id="@+id/textViewId"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!" />

TextView textView = findViewById(R.id.textViewId); // 确保ID正确

<!-- res/layout/activity_main.xml -->
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="viewModel"
            type="com.example.myapp.MyViewModel" />
    </data>

    <TextView
        android:id="@+id/textViewId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{viewModel.text}" />
</layout>

// 在Activity或Fragment中
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
binding.setViewModel(viewModel);

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        textView.setText("New Text");
    }
});

public class MyFragment extends Fragment {
    private TextView textView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        textView = view.findViewById(R.id.textViewId);
        textView.setText("Hello from Fragment!");
        return view;
    }
}