View file Android_klient/MobileApp/res/drawable-hdpi/button.xml

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

    <item android:state_pressed="true"><shape>
            <solid android:color="#519558" />
        </shape></item>
    <item><shape>
            <solid android:color="#90BD6F" />
        </shape></item>

</selector>