How to get outgoing call duration in real time? [duplicate]

This question already has an answer here: Closed 10 years ago.

Possible Duplicate:

It's possible to get outgoing call duration during call?

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

upd..

I think this data produces mobile operator server. And this server return call-duration and current balance after ea开发者_运维问答ch 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?

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Using a content Observer to listen Call Logs content URI if it changed:

ContentResolver contentResolver = context.getContentResolver();
CallLogObserver mObserver = new CallLogObserver(new Handler(), context);
contentResolver.registerContentObserver(
    Uri.parse("content://call_log/calls"), true, mObserver);

This is your CallLogObserver:

public class CallLogObserver extends ContentObserver {
    private Context context;

    public CallLogObserver(Handler handler, Context context) {
        super(handler);
        this.context = context;
    }

    @Override
    public void onChange(boolean selfChange) {
        super.onChange(selfChange);
        Log.i(TAG, "CallLogs Onhange()");
        try{
            Cursor c = context.getContentResolver().query(CallLog.Calls.CONTENT_URI, null,
                    null, null, CallLog.Calls.DATE + " DESC");
            if (c != null) {
                if (c.moveToFirst()) {
                    int type = Integer.parseInt(c.getString(c
                            .getColumnIndex(CallLog.Calls.TYPE)));
                    /*
                     * increase call counter for outgoing call only
                     */
                    if (type == 2){
                        String number = c.getString(c
                                .getColumnIndex(CallLog.Calls.NUMBER));

                        long duration = c.getLong(c
                                .getColumnIndex(CallLog.Calls.DURATION));

                                                    Log.i(TAG, "numer = " + number + " type = " + type + " duration = " + duration);

                                                }
                }
                c.close();
            }
            else
                Log.e(TAG,"Call Logs Cursor is Empty");
        }
        catch(Exception e){
            Log.e(TAG, "Error on onChange : "+ e.toString());
        }

    }