Listview的onItemClickListener无法响应的解决方法

在android开发中，listview是我们应用最多的控件之一。listview不仅仅是用来显示数据，有时候在item中可能需要ImageButton，Button，CheckBox等子控件(也可以说是Button或者Checkable的子类控件)，此时这些子控件会将焦点获取到，导致点击item无法响应。

这个时候就需要descendantFocusability来解决啦，descendantFocusability的API如下：

android:descendantFocusability

Defines the relationship between the ViewGroup and its descendants when looking for a View to take focus.
Must be one of the following constant values.

Constant	Value	Description
beforeDescendants	0	The ViewGroup will get focus before any of its descendants.
afterDescendants	1	The ViewGroup will get focus only if none of its descendants want it.
blocksDescendants	2	The ViewGroup will block its descendants from receiving focus.

This corresponds to the global attribute resource symbol 

descendantFocusability

.

Related Methods

该属性是当一个为view获取焦点时，定义viewGroup和其子控件两者之间的关系。

属性的值有三种：

beforeDescendants：viewgroup会优先其子类控件而获取到焦点

afterDescendants：viewgroup只有当其子类控件不需要获取焦点时才获取焦点

blocksDescendants：viewgroup会覆盖子类控件而直接获得焦点

解决这一问题我们要用第三个值，即在Item布局的根布局加上android:descendantFocusability=”blocksDescendants”的属性就好了。