如何绑定和调用android数据绑定中的` type`？

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@{viewModel.text}"
    app:type="String" />

public class ViewModel {
    public String text;

    public void setText(String text) {
        this.text = text;
    }

    // getter and setter for text property
}

ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
ViewModel viewModel = new ViewModel();
binding.setViewModel(viewModel);

viewModel.setText("Hello World");