How to obtain amount of transferred data through Wi-Fi from other applications?

I'm facing to this problem. I spent much time by searching some API or "something" with it's possible to obtain transferred data through Wi-Fi from other applications (how screenshot bellow shows).

Does someone know a way how to do it? Is here someone who tried (or has already done) for something similar? Or a little differently: Is this possible to do it?

Currently i think that this is not possible because i think that non-system application cannot retrieve data from other application(s) installed on device. But maybe i can "missing" something so i placed this question and will be glad for whatever suggestion.

Thanks in advance!

enter image description here

Solution

TrafficStats

Class that provides network traffic statistics. These statistics include bytes transmitted and received and network packets transmitted and received, over all interfaces, over the mobile interface, and on a per-UID basis.

This means you can use getUidTxBytes to get whole transmitted data and so far getUidRxBytes to get whole received data.

And you can get application's UID with:

getApplicationInfo().uid

or for other applications refer THIS