Broadcast Action: A sticky broadcast indicating an HMDI cable was plugged or unplugged The intent will have the following extra values: AudioManager.ExtraAudioPlugState, AudioManager.ExtraMaxChannelCount, AudioManager.ExtraEncodings.
It can only be received by explicitly registering for it with Android.Content.Context.RegisterReceiver(Android.Content.BroadcastReceiver, Android.Content.IntentFilter).