接听电话时如何获取事件

Question

你能帮我了解如何检测拨出电话是否被接听（我需要记录从接听到挂断的通话）？我可以检测到来电，但不能检测到呼出。所以请帮忙。

Answer 1

使用TelephonyManager.ActionPhoneStateChanged 监控TelephonyManager 状态，在收到TelephonyManager.ExtraStateIdle 后，您就知道手机无线电何时空闲（没有通话过程中）。

入站和出站广播接收器示例：

[BroadcastReceiver(Name = "com.sushhangover.OutgoingCallBroadcastReceiver")]
[IntentFilter(new[] { Intent.ActionNewOutgoingCall, TelephonyManager.ActionPhoneStateChanged })]
public class OutgoingCallBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        switch (intent.Action)
        {
            case Intent.ActionNewOutgoingCall:
                var outboundPhoneNumber = intent.GetStringExtra(Intent.ExtraPhoneNumber);
                Toast.MakeText(context, $"Started: Outgoing Call to {outboundPhoneNumber}", ToastLength.Long).Show();
                break;
            case TelephonyManager.ActionPhoneStateChanged:
                var state = intent.GetStringExtra(TelephonyManager.ExtraState);
                if (state == TelephonyManager.ExtraStateIdle)
                    Toast.MakeText(context, "Phone Idle (call ended)", ToastLength.Long).Show();
                else if (state == TelephonyManager.ExtraStateOffhook)
                    Toast.MakeText(context, "Phone Off Hook", ToastLength.Long).Show();
                else if (state == TelephonyManager.ExtraStateRinging)
                    Toast.MakeText(context, "Phone Ringing", ToastLength.Long).Show();
                else if (state == TelephonyManager.ExtraIncomingNumber)
                {
                    var incomingPhoneNumber = intent.GetStringExtra(TelephonyManager.ExtraIncomingNumber);
                    Toast.MakeText(context, $"Incoming Number: {incomingPhoneNumber}", ToastLength.Long).Show();
                }
                break;
            default:
                break;
        }
    }
}

注意：确保为 ReadPhoneState 和 ProcessOutgoingCalls 添加权限，以使此示例正常工作。