android/WALT/app/src/main/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="NumberPickerPreference">
        <attr name="minValue" format="integer" />
        <attr name="maxValue" format="integer" />
    </declare-styleable>
    <declare-styleable name="HistogramChart">
        <attr name="description" format="string" />
        <attr name="numDataSets" format="integer" />
        <attr name="binWidth" format="float" />
    </declare-styleable>
</resources>