android静音相机快门声？

Question

I am using this

camera.takePicture(null, rawCallback, jpegCallback);

but with some devices it makes a sound when the camera captures the image.

Please can any one help, how can I mute camera shutter sound?

Answer 1

To mute, put this code before capturing an image

 AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
 mgr.setStreamMute(AudioManager.STREAM_SYSTEM, true);
 camera.takePicture(null, rawCallback, jpegCallback);

After 1 second it will unmute by putting in the below code:

 final Handler handler = new Handler();
 Timer t = new Timer();
 t.schedule(new TimerTask() {
    public void run() {
        handler.post(new Runnable() {
            public void run() {
            AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
            mgr.setStreamMute(AudioManager.STREAM_SYSTEM, false);
                    }
                });
            }
    }, 1000); 

Answer 2

You can turn it off programmatically from 4.2 onwards with:

Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(id, info);
if (info.canDisableShutterSound) {
    mCamera.enableShutterSound(false);
}

Answer 3

Use Below two lines before button click

 AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
    mgr.setStreamMute(AudioManager.STREAM_SYSTEM, true);

And these two lones just after image get captured:

AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
mgr.setStreamMute(AudioManager.STREAM_SYSTEM, false);

I know only this solution and I personally used it in my application

Answer 4

As harism mentioned, this is not possible to do on some devices, because there are legal requirements in some markets (Japan, for example) that taking a picture always results in an audible shutter sound.

The stream type used for these types of sounds is STREAM_SYSTEM_ENFORCED , and there's a read-only system property that determines whether or not you can mute such a stream.

Answer 5

Well, all those solutions are good but i prefer setting the volume to 0 (and not only system since some devices users other streams then system and/or not all streams include system) before:

smth like this would work flawlessly:

Camera mCamera = null;

function takePicture() {
   storeSoundSettings();
   setMuteAll(true);
   // init camera and such.
   Camera.CameraInfo info = new Camera.CameraInfo();
   Camera.getCameraInfo(IdOfCameraBackOrFront, info);
       if (info.canDisableShutterSound) {
           camera.enableShutterSound(false);
       }
   setMuteAll(false);
   recoverSoundSettings();
}

and store, recover and setMuteAll something like this:

int[] streams = new int[]{
                AudioManager.STREAM_ALARM,
                AudioManager.STREAM_DTMF,
                AudioManager.STREAM_MUSIC,
                AudioManager.STREAM_NOTIFICATION,
                AudioManager.STREAM_RING,
                AudioManager.STREAM_SYSTEM,
                AudioManager.STREAM_VOICE_CALL};
JSONObject json;
AudioManager manager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

public void storeSoundSettings() {
        json = new JSONObject();
        json.put("mode", manager.getMode());
        json.put("ringermode", manager.getRingerMode());

        for (int stream : streams) {
            json.put("stream_" + stream, manager.getStreamVolume(stream));
         }
}


public void recoverSoundSettings() {
        json = new JSONObject(readString("last_audio_setting", null));
        manager.setMode(json.getInt("mode"));
        manager.setRingerMode(json.getInt("ringermode"));

        for (int stream : streams) {
            manager.setStreamVolume(stream, json.getInt("stream_" + stream), AudioManager.FLAG_ALLOW_RINGER_MODES);
}

public void setMuteAll(boolean mute) {

    for (int stream : streams) {
        manager.setStreamMute(stream, mute);
        if (mute) {
            manager.setStreamVolume(stream, 100, AudioManager.FLAG_ALLOW_RINGER_MODES);
        } else {
            manager.setStreamVolume(stream, 0, AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
        }
    }
}

Do not forget to catch the exceptions. I removed them for better highlighting.