如何确定哪个应用程序阻止麦克风使用？ -- microphone 领域 和 7.1-nougat 领域 和 debug 领域 android 相关 的问题

Is there a way to determine which currently running application is using the microphone? I suspect the arrow launcher but would like to try and confirm this. I'm looking for a method which would provide logs / debug info to add to a bug report.

Android version 7.1. Rooted Nexus 5x.

I am not looking for another app to provide this functionality. I am a developer (though not Java) and would like to understand the processes involved in gaining access to and blocking the microphone.

here's the dump from dumpsys audio as requested by first answer:

 adb shell dumpsys audio  MediaFocusControl dump time: 12:43:52 pm  Audio Focus stack entries (last is top of stack):   Notify on duck: true   Stream volumes (device: index) - STREAM_VOICE_CALL:    Muted: false    Min: 1    Max: 7    Current: 1 (earpiece): 5, 40000000 (default): 5    Devices: speaker - STREAM_SYSTEM:    Muted: false    Min: 0    Max: 7    Current: 1 (earpiece): 5, 2 (speaker): 4, 40000000 (default): 5    Devices: speaker - STREAM_RING:    Muted: false    Min: 0    Max: 7    Current: 1 (earpiece): 5, 2 (speaker): 4, 40000000 (default): 5    Devices: speaker - STREAM_MUSIC:    Muted: false    Min: 0    Max: 15    Current: 4 (headset): 5, 8 (headphone): 5, 40000000 (default): 11    Devices: speaker - STREAM_ALARM:    Muted: false    Min: 0    Max: 7    Current: 40000000 (default): 6    Devices: speaker - STREAM_NOTIFICATION:    Muted: false    Min: 0    Max: 7    Current: 1 (earpiece): 5, 2 (speaker): 4, 40000000 (default): 5    Devices: speaker - STREAM_BLUETOOTH_SCO:    Muted: false    Min: 0    Max: 15    Current: 40000000 (default): 7    Devices: speaker - STREAM_SYSTEM_ENFORCED:    Muted: false    Min: 0    Max: 7    Current: 1 (earpiece): 5, 2 (speaker): 4, 40000000 (default): 5    Devices: speaker - STREAM_DTMF:    Muted: false    Min: 0    Max: 15    Current: 1 (earpiece): 11, 2 (speaker): 9, 40000000 (default): 11    Devices: speaker - STREAM_TTS:    Muted: false    Min: 0    Max: 15    Current: 4 (headset): 5, 8 (headphone): 5, 40000000 (default): 11    Devices: speaker  - mute affected streams = 0x2e  Ringer mode:  - mode (internal) = NORMAL - mode (external) = NORMAL - ringer mode affected streams = 0x1a6 (STREAM_SYSTEM,STREAM_RING,STREAM_NOTIFICATION,STREAM_SYSTEM_ENFORCED,STREAM_DTMF) - ringer mode muted streams = 0x0 - delegate = ZenModeHelper  Audio routes:   mMainType=0x0   mBluetoothName=null  Other state:   mVolumeController=VolumeController(android.os.BinderProxy@2e64f54,mVisible=false)   mSafeMediaVolumeState=SAFE_MEDIA_VOLUME_INACTIVE   mSafeMediaVolumeIndex=50   mPendingVolumeCommand=null   mMusicActiveMs=1500001   mMcc=234   mCameraSoundForced=false   mHasVibrator=true   mControllerService={mUid=0,mComponent=null}   mVolumePolicy=VolumePolicy[volumeDownToEnterSilent=true,volumeUpToExitSilent=true,doNotDisturbWhenSilent=true,vibrateToSilentDebounce=400] 

I have also tried:

adb shell dumpsys activity broadcasts | grep -i microphone 

This gives no output.

I'm unsure about Nougat but this works for Android 6.0.1. Run:

adb shell dumpsys audio  

In the output look under Audio Focus stack entries (last is top of stack). E.g., when I had an audio recorder app using microphone, the output was:

 Audio Focus stack entries (last is top of stack):   source:android.os.BinderProxy@a60844c -- pack: com.sonymobile.androidapp.audiorecorder -- client: android.media.AudioManager@a251d71com.sonymobile.androidapp.audiorecorder.shared.media.VolumeControl@72c2756 -- gain: GAIN -- flags:  -- loss: none -- uid: 10108 -- attr: AudioAttributes: usage=1 content=2 flags=0x0 tags= 

Here the package using the microphone is com.sonymobile.androidapp.audiorecorder.

Using logcat extreme and monitoring per app set to WhatsApp , it shows

mediaFocuscontrol: Audiofocus*request*Audiofocus() from Android.media.audiomanager when microphone is activated

And

mediaFocuscontrol: Audiofocus*abandon*Audiofocus() from Android.media.audiomanager when microphone is de-activated