A few weeks ago I wished to play Jazz Jackrabbit 2 on my Android mobile. Luckily, I found on Youtube a video of somebody attemping to play JJ2 on his Android tablet, but he was complaining that the game is too laggy to be playable. I tried on my phone and with the settings set to minimum and disabled music it works almost perfect (The beach levels lag a little bit). Here are some photos of my single player progress: http://imgur.com/a/2MoJJ#0 (Currently at "Jungle Jump" level)

To play Jazz Jackrabbit 2 on your Android phone/tablet, watch the video below:
https://www.youtube.com/watch?v=f21K1Exq2jA

You'll have to install a program for opening .iso files on the PC (Suggestion: PowerISO), DosBOX Turbo and Game Pad for your Android device.

I don't have the time to write a complete tutorial, but here are some optimization tips:
-Disable the sound from DosBOX Turbo;
-Set the video settings to minimum;
-Choose a lower resolution for the game if it does still lag;
-Set the memory size (memsize) from the DosBOX config (dosbox.conf) to 32 MB. This worked for me.

Also, here's a suggestion for how to set your keys for a better gameplay:
Set the controls of JJ2 like that: http://imgur.com/Zd4yqkM
The controls for DosBOX Turbo should look like this (Set them using Game Pad): http://imgur.com/4JpIpxh

It doesn't work on multiplayer mode, at least not for me.

Anyway, if you have trouble with anything please answer this thread. I am too busy to write a full tutorial of this, unfortunately. Have a nice day!