问题
I currently have an app that generates sounds on the fly, like pure tones and white noise, and I can hear that on the headphones. Is it possible to send the same signal to the internal speakers and the headphones at the same time? I would like to do this on iOS 7 and KitKat. Probably, Android L and iOS 8 in the future...
On iOS I have seen that a new feature was introduced on iOS 6, multiroute, which let select the audio route. The thing is that when I connect the headphones I can not choose the internal speakers. Maybe I am doing something wrong. I think that would help me on Android...
On Android, I have found this simultaneously using a headphone and speaker. But that is from one year ago.
Has anyone tried this?
Thanks!
回答1:
On iOS, I don't think you can route audio to both the headphones and the speakers. You can control the routing to different audio interfaces using the multi-route audio code included in this Apple WWDC slideshow, but the built-in headphone jack and speakers are part of the same audio interface, and I don't think there is a way to override the behavior within that interface of disabling the speaker when the headphones are connected.
回答2:
To do this on Android, it should suffice to set your audio stream to STREAM_ALARM:
MediaPlayer player = new MediaPlayer();
//
// Your player initialisation code here
//
player.setAudioStreamType(AudioManager.STREAM_ALARM);
来源：https://stackoverflow.com/questions/25451692/has-anyone-tried-to-play-sounds-through-the-speakers-and-headphones-at-the-same