res/drawable/bluebackground.xml


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