controlling acceleration from android device

I don’t think so. At least there isn’t any commonly known method. Why would you want that anyway?

 

of course there is. there's a tube video of guys with a computer taking complete control of the car away from the driver.

 

I few years ago I think that there was a thread of someone wanting to do the same.
Using the OBDII port may not be the easiest.
An easier option IMHO is to intercept the output of the accelerator module connected to the pedal and add black box there with say a wifi interface which can then be controlled by an app.
The manipulated pedal signal would then be sent on to the engine ECU.
Good luck.