Easy Android Plugins is an Editor extension that allows you to compile Android code directly from the editor.
When coding in Unity, you make your code in an intermediate language. That means that your C# code (or unityscript, or boo) is going to be translated to the target platform. The good thing is that you only have one codebase for all platforms. The bad thing is that you lose the specific features of every platform.
Unity tries to remedy that with the usage of plugins. Plugins are pieces of code that are coded in the specific target platform. These pieces of code can be called from your Unity code so you can use the specific features of the desired platform.
The bad news: You need to know how to compile the code in the target platform, making it a little convoluted. You need to change from your Unity editor to another development environment, compile the Android code, copy the resulting binaries then back again to Unity. Having two different development environments is never a good thing.
The good news: with Easy Android Plugins there's no need to leave Unity. You can compile your .java files directly from the editor. An easy solution that simplifies your Android plugins development.
With this plugin is fairly easy to develop Android plugins:
1) Create an Android project inside Unity with just one click.
2) Place your .java files under that folder.
3) Compile the java files with one click.
Just can't be easier that that!