<?xml version="1.0" encoding="utf-8"?>
<resources>
	<declare-styleable name="ProgressWheel">
        <attr name="text" format="string" />
        <attr name="textColor" format="color" />
        <attr name="textSize" format="dimension" />
        <attr name="barColor" format="color" />
        <attr name="rimColor" format="color" />
        <attr name="rimWidth" format="dimension" />
        <attr name="spinSpeed" format="dimension" />
        <attr name="delayMillis" format="integer" />
        <attr name="circleColor" format="color" />
        <attr name="radius" format="dimension" />
        <attr name="barWidth" format="dimension" />
        <attr name="barLength" format="dimension" />
        <attr name="contourColor" format="color"/>
        <attr name="contourSize" format="dimension"/>
    </declare-styleable>   
</resources>
<?xml version="1.0" encoding="utf-8"?>
<resources>
	<declare-styleable name="ProgressWheel">
        <attr name="text" format="string" />
        <attr name="textColor" format="color" />
        <attr name="textSize" format="dimension" />
        <attr name="barColor" format="color" />
        <attr name="rimColor" format="color" />
        <attr name="rimWidth" format="dimension" />
        <attr name="spinSpeed" format="dimension" />
        <attr name="delayMillis" format="integer" />
        <attr name="circleColor" format="color" />
        <attr name="pw_radius" format="dimension" />
        <attr name="barWidth" format="dimension" />
        <attr name="barLength" format="dimension" />
        <attr name="contourColor" format="color"/>
        <attr name="contourSize" format="dimension"/>
    </declare-styleable>   
</resources>
Change attribute radius by "pw_radius", it was colliding with Google Play Services library attribute named the same.
Change attribute radius by "pw_radius", it was colliding with Google Play Services library attribute named the same.
