如何检查任何后台应用程序是否使用麦克风

Question

I have been searching for couple of days now and havent been able to find a suitable solution.

I am trying to check if any app in the background is using the microphone, so my app can use it, otherwise i want just to show message "Microphone in use by another app".

I tried checking all the applications in the background and their permissions but that doesnt solve my problem, since there is package wearable.app which asks for the permissions but it doesnt affect the audio, or it is not using it.

I tried the other solutions that i was able to find here or on google, but none of that seems to be the proper way.

All i want to check if the microphone is not being used, so my app can use it.

Any suggestion i will appreciate.

Answer 1

After searching more i found the solution and i am adding it here for anyone that needs it to find it easier.

private boolean validateMicAvailability(){
    Boolean available = true;
    AudioRecord recorder =
            new AudioRecord(MediaRecorder.AudioSource.MIC, 44100,
                    AudioFormat.CHANNEL_IN_MONO,
                    AudioFormat.ENCODING_DEFAULT, 44100);
    try{
        if(recorder.getRecordingState() != AudioRecord.RECORDSTATE_STOPPED ){
            available = false;

        }

        recorder.startRecording();
        if(recorder.getRecordingState() != AudioRecord.RECORDSTATE_RECORDING){
            recorder.stop();
            available = false;

        }
        recorder.stop();
    } finally{
        recorder.release();
        recorder = null;
    }

    return available;
}

Answer 2

You can do it the other way around.

Get the microphone in your app.

Get a list of the installed apps, who have a RECORD permission.

Then check if one of these apps is on the foreground and if there is one release the microphone so that the other app can use it (for example when a phone call occurs).

A bit dirty practice but I think it is what you are looking for.

Cheers!

Answer 3

I know this may sound a bit tedious or the long way... But have you considered recording a logcat? Record a log for both Kernel and apps. Recreate the issue, then compare both logs to see what program is occupied when the kernel utilizes the mic.