dictation / app / src / main / res / drawable / press_back.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/gray_m2" />
    <item android:state_pressed="false" android:drawable="@color/trans" />
</selector>