sheishuoAPP/app/res/drawable/background_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:exitFadeDuration="@android:integer/config_shortAnimTime">

    <item android:state_pressed="true" android:drawable="@color/grey_white_has_alpha" />
    <item android:state_focused="true" android:drawable="@color/grey_white_has_alpha"/>
    <item android:drawable="@color/transparent"/>

</selector>