Android - ConstraintLayout percentage using dimens

Question

There is a question How to make ConstraintLayout work with percentage values? and its answers show how to use the percentages:

Answer 1

Instead of using a dimen resource, use an item resource of type dimen:

<item name="guideline_perc" type="dimen">0.5</item>

If using integers, an integer resource would work best:

<integer name="guideline_perc">1</integer>

Answer 2

To set a percentage use the fraction syntax

<fraction name="guideline_perc">0.5</fraction>

and then

app:layout_constraintGuide_percent="@fraction/guideline_perc"