QSPackKit/sdk/jm_jinli/res/drawable/zzz_back_src_light.xml

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

    <item android:drawable="@drawable/zzz_back_down_light" android:state_pressed="false"></item>
    <item android:drawable="@drawable/zzz_back_light" android:state_pressed="true"></item>

</selector>