A brief analysis of android:descendantfocusability usage

When making a list of music in the ListView, do a good job to find that clicking on the item sometimes does not respond, just click on the control inside,

Baidu later found that this is a very common development problem, the project in the ListView is not just simple text, often need to define their own ListView, their own adapter to inherit Baseadapter, in adapter in accordance with the requirements of the writing, the problem arises, Because there are child controls such as Imagebutton,button,checkbox in your own definition of item, these child controls get the focus, so often when you click Item, the child controls are changed, and the item itself is clicked without responding.

This can be solved by using descendantfocusability, which defines the relationship between ViewGroup and its child controls when a view gets focus.

There are three types of values for the property:

Beforedescendants:viewgroup takes precedence over its subclass control and gets to focus

Afterdescendants:viewgroup gets focus only if its subclass control does not need to get focus

Blocksdescendants:viewgroup overrides the subclass control and gets the focus directly

Usually we use the third type, that is, the root layout of the item layout plus the android:descendantfocusability= "blocksdescendants" properties.

A brief analysis of android:descendantfocusability usage