What Android app shows, in real-time, what apps and processes are currently transmitting and receiving data?
I am interested in quantity of data being transmitted (not speed).
Recommendations for paid apps are fine, but gratis is preferred.
Apps requiring root are acceptable, but please specify if it requires root privileges in your answer.
Note that Android's integrated data manager sort of does this, but it is really only effective for cumulative data over multiple days. It doesn't work well for real-time information.