Google Code was most popular for hosting different project data. Generally we were able to store and download opensource code there and use it in different widget creation. From the time being Google code has changed to Google Developers (I mean previously it was know as Google Code). This is a strongest tools of Google's site for software development tools, application programming interfaces (APIs), and technical resources.
Earlier today, Google announced - http://google-opensource.blogspot.com/2015/03/farewell-to-google-code.html that they will be turning down Google Code Project Hosting. From March 12, 2015 - New project creation disabled. Google code begins their journey in 2006 with the goal of providing a scalable and reliable way of hosting open source projects. And from 2006 millions of people have stored open source projects that hosted on that site.
Due to rapid changes presently Google brought changes on their open source product. However there are many other options for hosting open source projects have popped up, they also provide open source projects hosting facility, such as GitHub, Bitbucket and SourceForge.
According to Google they will be shutting down Google Code within the coming months that means April 2015. Google code site will no longer accept new projects from now. But those who has already hosted their open source projects those will remain functionally unchanged until August 2015. August 24, 2015 - The site goes read-only. You can still checkout/view project source, issues, and wikis. It can be use for various purposes and after that, project data will be read-only.
Google also said they are going to shut down this site at the beginning of 2016, January 25, 2016 - The project hosting service is closed. But you will be able to download a tarball of project source, issues, and wikis. These tarballs will be available throughout the rest of 2016.
So if you have already stored open source project then you should migrate your data on GitHub or Bitbucket. You have several options for migrating your data. But the simplest option would be to use the Google Code Exporter - https://code.google.com/export-to-github/. This is a new tool that will allow you to export your projects directly to GitHub. Alternatively, Google has documentation - https://code.google.com/p/support-tools/ for migrate manually to other services like GitHub, Bitbucket, and SourceForge.