Thank you for the opportunity to help you with your question!
LUA – LUA is simpler to learn than Java and
takes less effort in developing Android Apps. A simple App to display a background
image and write some text on screen can just be written in three lines. You can
use Corona SDK for the language.
Python – it is widely used general-purpose
high-level programming language. It emphasizes on code readability and allows
programmers to express their concepts in fewer lines of code.
Ruby – it was developed in the late 90’s by
Yukihiro Matsumoto. It is designed to have syntax that was easy to read and
write by mere humans without the need of massive commands. Its easy to learn
and be familiar with its basics in a short period of time.
C/C++ - it might take some time to learn but
knowledge in this language makes all other languages easy.
Please let me know if you need any clarification. I'm always happy to answer your questions.