Apps How to get outgoing call duration in real time?

[vovs]

Hi, guys!

Now I write one app and have some problem -
I need to show real-time outgoing call duration. But I do not know when I should start timer.
I must start when get answer from other side.
I tried TelephonyManager.EXTRA_STATE_OFFHOOK -- but it's state is when I press call-button..

OFFHOOK is the state when call is placed.

So we should be notified when the call is received.
How can we get that?

Can You help me? When I should start count outgoing time?

Thanks

 

[vovs]

I think this data produces mobile operator server. And this server return call-duration and current balance after each outgoing call .
Maybe It's right?

I can't find any solution, but after each call value of call duration will be stored in db. We can get it by CallLog.Calls.DURATION
How this value populate field in db?