In the older days of Android, developers had to use the open-source Eclipse IDE (integrated development environment) to create apps for the platform. Google released its own IDE called Android Studio in 2014, but continued to support those that decided to stick with Eclipse.
Today, that support ends. The news follows the release of Android Studio 2.2 in September, although Google announced that it was planning on ending support for the Eclipse Android Development Tools in mid-2015.
The company says that all of the features that were part of Eclipse should now be part of Android Studio. If there's anything that's still missing, a survey is being offered where you can submit feedback on the IDE.
Migrating your projects over to Android Studio should be a fairly simple task. All you'll need to do is open the IDE and choose File > New > Import Project from the menu.
For those that are concerned, the command line tools are still available. These are useful for those that need things like ADB tools, such as people that just want to flash an Android image on their device.
Android Studio is, as always, a free download, meaning that Microsoft is still the only major OS-maker that charges for developer tools. You can grab it right here.