How to view Android application source code??

Is it possible to view an app source while app is running and what next code will come?
Means if in ludo can i see what dice comes next?

what if my apk doesn t not have a .dex file?

Does it work with games?
If yes then I can make scripts and sell them to people who want to hack games.

Great as usual mate!

Thanks anna ..I think I asked about this video 2months before!!! Now finally you did it .... thanks anna