FruitTrainingDataset/test/android/res/values-v21/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="android:Theme.Material.Light.NoActionBar.Fullscreen">
        <item name="android:colorBackground">@color/ic_background_color</item>
    </style>
</resources>