I can't find any documentation or example code on how to create an animation file in the WebP format on Android. I know how to encode one WebP image from a Bitmap. I also know there exists a webpmux command line utility to combine multiple WebP images into one WebP file containing multiple frames. What I don't know is how to do this from Java code.
I'm perfectly happy with using a high version Android SDK, 4.3+ is fine, which means WebP should be fully supported.