How to get the focus of textview in linearlayout

In linearlayout, click events are often set. When the time is long, the background image is modified, and the font color in textview is also modified.
Generally, it is OK to set textcolor of textview to a selector. It is OK for most models, but in some models,
When you press linearlayout for a long time, the background image is modified, but the font color of textview remains unchanged. After debugging, it is found that the textview is not obtained
Because the font color is not modified.

In XML, Set
Android: duplicateparentstate = "true.

The general explanation is to copy the status information of the parent View to the current view.

NOTE: IfProgramDuplicateparentstate is invalid.