I am trying to get the app last running time (not only my app) in android.
From my understanding, all app is installed in /data/app/.
So, I try to run stat command in adb shell to obtain the last access time of all apk.
But it is surprising to me that the last access time seems to be the last installed/updated time instead of the running time. Why is it so? I think android system need to "access" the apk in order to load it and run it.
Because of performance, access time is not updated anymore
http://en.wikipedia.org/wiki/Stat_%28system_call%29#Criticism_of_atime