How to track traffic in Android?

Question

Java

Interested in the tracking mechanism itself, in addition, is it possible to pull out some data of the type of speed, which application sends / receives how much data?
Will the Android API suffice for such a task, or will you have to turn to calls in c ++?

Answer 1

This is called sniffing.
We go to the playmarket, look for applications by requests like "http sniffer", find them, look ... download, decompile))
I saw such a sniffer, and apparently it works at the TCP level, not HTTP, i.e. even deeper.
But for it to work, the OS required you to put a password on the unlock screen. There was something connected with VPN and certificates, but he also knows how to decode HTTPS, which is not always necessary, maybe this is because of this? And if without decoding, then a password and certificates are not needed?
PS And another option is Genymotion + Fiddler.

Answer 2

google "android local sniffer"
methods - driver, vpn, transparent proxy, etc.

Answer 3

Fiddler (Windows/Linux)
Charlesproxy (Mac)