Detect if an outgoing call has been answered

问题:

Once ACTION_NEW_OUTGOING_CALL has been broadcasted, I need to capture the following event of the other party answer. Could you advice on how to achieve that please? I know it is possible as the android dialer app changes the green android icon to the person's photo excatly when they pick up. Thanks!

UPDATED: I've had a look at the source of the app on Android handling the outgoing calls. I noticed the following method in ContactsUtils:

/**
 * Kick off an intent to initiate a call.
 */

 public static void initiateCall(Context context, CharSequence
 phoneNumber) {
     Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED,
             Uri.fromParts("tel", phoneNumber.toString(), null));
     context.startActivity(intent); }

I guess my answer is in the activity listening for Intent.ACTION_CALL_PRIVILEGED. So to reprhase my question: Does anyone know which activity handles Intent.ACTION_CALL_PRIVILEGED? Thank you in advanced

回答1:

I don't think there's such API and also there's no API for sending DTMFs due to the same reason that you can't tell when the call is being connected.

回答2:

It does not necessarily needs to be possible to capture this as an outside app. The green android icon is a part of the application that controls the call, so it does not need a broadcast to change the icon.

回答3:

As far as android's telephony manager is concerned u cannot detect programmatically whether the call has been answered or not. This is to say that u do not have the option to know when the user picked the phone at other end. Android has got 3 states of telephony manager and none of them are capable of detecting whether the call was actually answerd or not(IN CASE OF OUTGOING CALLS)

回答4:

The only way you may be able to do this is by parsing the Logcat logs, no PhoneStateListener event is available for that.

Some are asking for it here: https://code.google.com/p/android/issues/detail?id=14266

Anyway, in versions above Android 4.2 as Logcat is "sandboxed" it may be impossible...