Android - API 检查哪个设备（有线耳机或 USB 耳机）正在播放音频（如果两者都已连接）

Question

I have a problem detecting which device, wired headset or USB headset is playing audio when both of them are connected to an Android device.

Is there an API which will allow checking that?

I have noticed that different devices behave in a different way. Eg on Samsung S10+ with Android 9 the peripheral attached later is used to play audio. However on Moto G6 Android 7 and Samsung S8+ Android 9 wired headset is always used, no matter which peripheral was connected later.

I need this information to correctly configure the audio stream and to show which device is currently being used.

Answer 1

Please have a look at MediaRouter API.

MediaRouter.RouteInfo getSelectedRoute() is probably what you are looking for.

Also it allows you to register a listener to be notified when current audio device configuration changes(MediaRouter.Callback interface). Its onRouteSelected and onRouteUnselected callbacks are called when an audio device starts/stops to play audio respectively.

Here's a log (abridged) from my MTK device demonstrating attributes of MediaRouter.RouteInfo and flow of events that occurred when I plugged in wired headphones while listening to music via Jabra Bluetooth headset.

onRouteChanged RouteInfo{ name=Headphones, description=null, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO, presentationDisplay=null }

onRouteUnselected RouteInfo{ name=Jabra MINI v1.0.5, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO, presentationDisplay=null }

onRouteSelected RouteInfo{ name=Headphones, description=null, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO, presentationDisplay=null }

onRouteRemoved RouteInfo{ name=Jabra MINI v1.0.5, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO, presentationDisplay=null }