Android：如何使用 android 的 ImageDecoder 遍历 webp 帧

Question

I want to convert the animated webp into gif and I have gif encoder+decoder and webp ecnoder and it is working fine with gifs only. I want to process the animated webp as well so I need to decode the animated webp first and get bitamps for each frames. I could not get any animated webp decoder and later found that android.graphic has Image decoder which support animated webp image but it shown example for drawable and it has start() method for animated webp.

How can I iterate through each frames to convert them into bitmap or some data type like byte[], base64, streams, etc so that i can convet that into bitmap.

 File file = new File(...);
  ImageDecoder.Source source = ImageDecoder.createSource(file);
  Drawable drawable = ImageDecoder.decodeDrawable(source);

Answer 1

As alternative for achieving same goal I have solved this by using Glide and APNG4 library along with some encoder decoder available on git.

You can do both encode decode and and other stuff alone with APNG4.

https://github.com/penfeizhou/APNG4Android