Demo how APK Expansion Files work. Basically, current APK will download expansion file from Google Play which contains additional ASSETS (e.g. sample.mp3).
Once download file is successfully, press Play Music Button to start playing sample.mp3 which resides in APK Expansion file.
Currently, Google Play requires APK file be no more than 100MB. If your app exceeded 100MB, you will need to host additional resources in expansion files.
Source code is available at: