path: root/app/src/main/res/color/main_button_state_color.xml

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