1.概述

在12.0定制化开发时，在Camera2静音情况下有快门拍照声音，这就不符合使用规范了
静音的情况下拍照也不应该发出声音，所以在静音拍照流程中要求去掉快门声音

2.Camera2静音拍照去掉快门声音核心代码

    Camera2拍照主要代码:/packages/apps/Camera2/src/com/android/camera/one/v2/photo/PictureTakerImpl.java/packages/apps/Camera2/src/com/android/camera/one/v2/photo/PictureCallbackAdapter.java/packages/apps/Camera2/src/com/android/camera/CaptureModule.java

3.Camera2静音拍照去掉快门声音核心代码功能分析
3.1 拍照功能在PictureTakerImpl.java中

    /packages/apps/Camera2/src/com/android/camera/one/v2/photo/PictureTakerImpl.java

    @Overridepublic void takePicture(OneCamera.PhotoCaptureParameters params, final CaptureSession session) {OneCamera.PictureCallback pictureCallback = params.callback;// Wrap the pictureCallback with a thread-safe adapter which guarantees// that they are always invoked on the main thread.PictureCall