Hi, is there any way to keep game running in background ?

Usually game closes after few 20-25 seconds.
I want to keep game running when it's minimized for few minutes or forever till I close it.

My mobile have 3gb ram and it never cross 2gb ram consumption.
There is always 1-1.8 GB unused free ram.

Basic locking apps to keep running don't help much more then keeping it alive for few more secs.
I need it to keep running so that I can reply friends on whatsapp or can attend calls without any tension of app closing.
Any universal or our game specific trick is welcome.

Please keep it progressive and positive.


Happy New Year to All


#rooting is ok..what to do next.