DataBindingUtil.findBinding(View view)和getBinding(View view)有哪些区别？

Question

方法findBinding(View view)的预期目的是什么？ 我一直在使用Data Binding Library beta版本。由于没有关于各个类的官方参考文档，所以我一直在查看源代码，看看我们可以访问哪些方法。 DataBindingUtil类有两个听起来似乎会做类似事情的方法：

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

第二种方法getBinding只是一个实用方法，调用了ViewDataBinding类的getBinding方法。

第一个方法findBinding有点不太清楚，难以理解其目的。你有什么想法吗？

- Sound Conception

Answer 1

抱歉，该网页缺少说明文档，但应在 SDK Maven 存储库中提供。

区别在于，find binding 将遍历父级，而 getBinding 如果给定的视图不是绑定根，则会返回 null。以下是说明文档：

/**
 * 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) {

- yigit

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已经有一段时间了，但是没有适用于数据绑定的正确文档！我看到许多在Medium和G+上关于数据绑定的博客文章。您应该将其添加到文档中，而不是先发布博客。 - kirtan403