Android animation of concentric expanding fading circles

In Android, I am looking for as simple as "built-in" way as possible of creating either create a drawable or custom view of animating 4 concentric circles of slowly expanding radii.

Where would be the best place to start?
Is it possible to do this in pure XML?
If not, can this be done using a single-layer drawable, or should I use a multi-layer drawable?

Thanks!

Copyright Notice：Content Author:「swooby」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/39091684/android-animation-of-concentric-expanding-fading-circles

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