qt/jdc/mobile/trunk/res/drawable/button_background.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/blue" /> 
    
    <item android:state_focused="true" 
        android:drawable="@color/blue" /> 

    <item android:drawable="@color/trans" /> 
    
</selector>