item_bg_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true">
<shape>
<solid android:color="#eeeeee" />
</shape>
</item>
<item android:state_pressed="true">
<shape>
<solid android:color="#eeeeee" />
</shape>
</item>
<item>
<shape>
<solid android:color="#00000000" />
</shape>
</item>
</selector>
注意事项
如果给布局添加selector，记得添加android:clickable="true"属性
