应用在运行时花费的时间

Question

I want to calculate the time an app took while running in the foreground activity,

for example : if I opened my fb application on android, can I know the time I opened it and the time I closed the application at it or no?

I want to know the time of a running app in the front not the background services.

Thanks.

Answer 1

This is unfortunately a little difficult to do in Android. Generally, this is the idea:

• Every activity's onResume() is called once when that activity appears in front of the user.
• Every activity's onPause() is called once when that activity disappears.

What I do in my app is the following:

• Every activity in my application becomes the subclass of some GenericActivity
• That GenericActivity keeps two arrays, openArray and closeArray
• Every time onResume() is called, getCurrentTimeMillis is pushed onto openArray
• Every time onPause() is called, getCurrentTimeMillis is pushed onto closeArray
• Whenever openArray and closeArray have the same number of elements, that means the app has been closed. Subtract the first element of openArray from the last element of closeArray . That should give you the number of milliseconds the application was open in front of the user.

Sorry for the longish answer. Let me know if this makes any sense.