android - DataBindingUtil findBinding(查看 View )与 getBinding(查看 View )

Question

该方法的预期目的是什么 findBinding(View view) ？

我一直在使用数据绑定(bind)库测试版。
目前还没有针对各个类的官方引用文档，所以我一直在查看源代码以了解我们可以访问哪些方法。

DataBindingUtil 类有两个方法，听起来它们会做类似的事情:

• public static <T extends ViewDataBinding> T findBinding(View view)
• public static <T extends ViewDataBinding> T getBinding(View view)

第二种方法getBinding只是一个调用 ViewDataBinding 的实用方法类' getBinding方法。

第一种方法findBinding更不清楚的是要遵循和确定其目的。有什么想法吗？

Answer 1

抱歉，网页中缺少文档，但它们应该在 sdk maven 存储库中。

不同之处在于，如果给定 View 不是绑定(bind)根，则 find 绑定(bind)将遍历父级，而 getBinding 将返回 null。以下是文档:

/**
 * Retrieves the binding responsible for the given View. If <code>view</code> is not a
 * binding layout root, its parents will be searched for the binding. If there is no binding,
 * <code>null</code> will be returned.
 * <p>
 * This differs from {@link #getBinding(View)} in that findBinding takes any view in the
 * layout and searches for the binding associated with the root. <code>getBinding</code>
 * takes only the root view.
 *
 * @param view A <code>View</code> in the bound layout.
 * @return The ViewDataBinding associated with the given view or <code>null</code> if
 * view is not part of a bound layout.
 */
public static <T extends ViewDataBinding> T findBinding(View view) {

/**
 * Retrieves the binding responsible for the given View layout root. If there is no binding,
 * <code>null</code> will be returned. This uses the DataBindingComponent set in
 * {@link #setDefaultComponent(DataBindingComponent)}.
 *
 * @param view The root <code>View</code> in the layout with binding.
 * @return The ViewDataBinding associated with the given view or <code>null</code> if
 * either the view is not a root View for a layout or view hasn't been bound.
 */
public static <T extends ViewDataBinding> T getBinding(View view) {