I want to create an animation for android on blender but i don`t know how to export it for android.Can you help me?

I am sure android can display animation clips like in YouTube. All you do is to make an AVI animation file.

Now if you want to display 3D animated object real time is a different story. If there is a 3D game android can play, you can bring your animation in over that way. Or look in to web based interactive 3D display software.