Threema-Android-mirror/app/src/main/res/drawable/selector_button_tint.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
	<item
		android:state_enabled="false"
		android:color="?attr/markup_marker_color" />
	<item
		android:state_enabled="true"
		android:color="?attr/textColorSecondary" />
</selector>