Use theme colors in battery stats widget

        android:gravity="center_vertical"

        android:id="@+id/battery_history_chart"

        android:textAppearance="?android:attr/textAppearanceSmall"

        android:textColor="#ff000000"

        android:textColor="?android:attr/textColorPrimary"

        app:headerAppearance="?android:attr/textAppearanceMedium"

        android:shadowRadius="4"

        android:shadowColor="?android:attr/colorBackground"