The maximum size of the application in the Android Market increased to 4 GB

Previously, some applications had to be split into two parts - the main part of no more than 50 MB in size was laid out on the Android Market, and additional files, if necessary, were downloaded from your server after installing the application. Now you can save on hosting. In the Android Market, the allowed application size has been increased from 50 MB to 4 GB . Anything will fit there - any graphics and videos.

The maximum size of the .apk remains the same 50 MB, but now it can attach up to two extension files (APK Expansion Files) of 2 GB each, they are hosted on Google servers in binary blobs and have the standard .obb extension, although this can be files any format - MP4, ZIP, PDF, etc.

Before downloading, users will see the total size of the application, including the .apk and .obb files.

The .obb files are named according to the name of the package itself and are located in the specified places on the server and on the user device.
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Location: <shared-storage>/Android/obb/<package-name>/ Filename: [main|patch].<expansion-version>.<package-name>.obb Example: /sdcard/Android/obb/com.example.myapp/main.5.com.example.myapp.obb 

By increasing the allowed application size to four gigabytes, Google fulfilled the promise voiced in May 2011 at the I / O conference.

In fact, most applications in the Android Market are much less than 50 MB, rarely even 20 MB programs. Another thing is games, for which the larger the file size is, the better, now you can include various video clips between levels, colorful screensavers and everything else.

For some reason it occurs to me that several seasons of some “Dr. House” will fit into 4 GB. In theory, copyright holders can even sell movies through the Android Market under the guise of apps, why not?

Android Market Developer's Guide for Extension Files