BPG image format on Android
The BPG format is not supported by Android natively.
I've made a small application for Android that decompresses BPG images. You can have a look here: https://github.com/alexandruc/android-bpg, maybe you can reuse some of the code.
For use in the browser, there is a javascript decoder available in the source package.
I don't think this format is supported, yet, according to the Supported Media Formats
But you should give it a try.
Note:If you meant browser support, you should update your question to let everybody know it.
Edit:After some tests, I couldn't manage to make it work, even on Lollipop.
Conclusion, it is not supported, yet.