Dialog fixed width is 100% when screen width is under 320dp

<?xml version="1.0" encoding="utf-8"?>

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<resources>

    <!-- The platform's desired fixed width for a dialog along the major axis

         (the screen is in landscape). This may be either a fraction or a dimension.-->

    <item type="dimen" name="dialog_fixed_width_major">320dp</item>

    <!-- The platform's desired fixed width for a dialog along the minor axis

         (the screen is in portrait). This may be either a fraction or a dimension.-->

    <item type="dimen" name="dialog_fixed_width_minor">320dp</item>

</resources>

    <!-- The platform's desired fixed width for a dialog along the major axis

         (the screen is in landscape). This may be either a fraction or a dimension.-->

    <item type="dimen" name="dialog_fixed_width_major">320dp</item>

    <item type="dimen" name="dialog_fixed_width_major">100%</item>

    <!-- The platform's desired fixed width for a dialog along the minor axis

         (the screen is in portrait). This may be either a fraction or a dimension.-->

    <item type="dimen" name="dialog_fixed_width_minor">320dp</item>

    <item type="dimen" name="dialog_fixed_width_minor">100%</item>

    <!-- The platform's desired fixed height for a dialog along the major axis

         (the screen is in portrait). This may be either a fraction or a dimension.-->

    <item type="dimen" name="dialog_fixed_height_major">80%</item>