mobile

I don't know where i should ask this, but if i posted in the wrong subforum then i'm happily accepted that my post is moved.
So i'm wondering if there is an android emoji keyboard like the one in Play store that is open source. Well, i've been looking at this one :
https://github.com/zeuxisoo/android-emoji-keyboard
and it seems that i've builded it correctly, but then when it comes to test, the emoji didn't showed up correctly.
I've been trying to build an AOSP Keyboard using Eclipse but failed.
I got some source from Github (Maybe it's a same source, dunno) :
https://github.com/rockerhieu/emojicon
https://github.com/ankushsachdeva/emojicon
Anyone here know where the source of the emoji keyboard app? Or anyone wants to help me to build an android emoji app?
I know there is a lot of emoji keyboard, but i want to learn how to build it from stratch, without using apktool.
Thanks before :D