How to install these codes in Unity 3D ?

[shivanraptor]

Is there any tutorial for installation of these codes?

[kimsama]

You may need to know about that building eclipse java plugin for Unity3D.

Check the following may help that:
http://oferei.com/2013/05/building-unity-for-android-with-eclipse/

[shivanraptor]

Okay, how about Android Studio?

[kimsama]

I've been never tried Android Studio before, so I can't sure about that. But if you can correctly build .jar with Android Studio, it also should work.