What is the most preferable software to create Android Application?

What is the most preferable software to develop aplication for androids? Just application for calculation with 3D or 2D graphics and not gaming. Coz i heard unity is good for developing gaming application, but mine is not gaming type.
And if i were to create the application with flash, can i combine with the part develop by unity later on?


Also, if i were to use 3D graphics in the application, what is the best software to create the graphics?

Thank you for any responses because im just a newbie and i have nowhere to seek advice.