Conversion of apk files to epub file format

It looks like that some older ebooks were in the past distributed as stand-alone APK apps for Android, which seems to be the case for for publications by O'Reilly, which is perhaps why some users are looking for apk to epub conversion in first place.

As far as we know, no reliable way how to export them to EPUB exists. Nonetheless, you can try to explore the APK by renaming it to ZIP and extracting all the contents. The ebook must be somewhere within and if it's not then there is no way how to convert it anyway.

Open APK file    Open EPUB file