DataBindingUtil findBinding(视图)与getBinding(视图视图)

Question

findBinding(View view)方法的目的是什么？

我一直在使用测试版。

目前还没有针对各个类的官方参考文档，因此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，听起来好像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)

第二个方法getBinding只是一个实用方法，它调用ViewDataBinding类的getBinding方法。

第一种方法findBinding对于跟踪和确定它的用途有点不清楚。有什么想法吗？

Answer 1

对不起，网页中缺少文档，但是它们应该在sdk maven存储库中。

区别在于，查找绑定将遍历父视图，而如果给定视图不是绑定根，则getBinding将返回null。这是文档：

/**
 * 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) {