Measure data roaming traffic on Android?

Question

Just back from a very nice vacation in Iceland, and await the data roaming bill from my phone company. I hope for the best having limited my traffic as much as possible, but

Answer 1

Method 1. Parse "/proc/net/dev".

In my phone it looks like:

Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:     712       8    0    0    0     0          0         0      712       8    0    0    0     0       0          0
dummy0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
rmnet0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
rmnet1:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
rmnet2:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
 wlan0:  146112     423   32    0    0     0          0         0    42460     409    0    0    0     0       0          0

In my phone the "rmnet0" row is the one that holds the stats for mobile line internet. I hope its format does not vary among kernel versions.

Method 2: Parse "/sys/class/net".

I guess this is the recommended method. As shown here: http://www.jaqpot.net/svn/android/netcounter/trunk/src/net/jaqpot/netcounter/service/SysClassNet.java