android - Gradient Radius as percentage of screen size

Question

I'm trying to create a shape drawable with radial gradient background, with radius that will adjust to the screen size (take a look at the relevant documentation).

This is my code:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:endColor="#000"
        android:gradientRadius="50%p"
        android:startColor="#5d2456"
        android:type="radial" />
</shape>

But it doens't seem to work. if I remove the "%p", it works, but then the radius will be static, thus not adjusting to the screen size...Any idea what's wrong?

Answer 1

From what I′ve tested, the % does work, but not as you expected.
First of all

android:gradientRadius="50"

seems to take the value as pixels 50px

android:gradientRadius="50%"

is converted as if 50% = 0.5 px, try

android:gradientRadius="5000%"

and you will see a 50px radius.
Using %p has a similar result. Obviously this is something I hope will be changed in the future, because it does not have much use as it is. Usually XML ShapeDrawable resources adapt their size to some external container, in this case gradientRadius is setting the size regardless of the container.