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 exactly when they pick up.
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 rephrase my question: Does anyone know which activity handles Intent.ACTION_CALL_PRIVILEGED?
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...
来源：https://stackoverflow.com/questions/9513644/how-can-i-detect-when-a-call-is-answered