SampleCamera2 Implementation of android.hardware.camera2 package base on SampleOpenGLPlayer that uses GLSurfaceView, Surface of SurfaceTexture. How SampleCamera2 works? Step 1: Create GLSurfaceView for camera2 required EGL environment Step 2: Create
关于打开相机的openCamera流程参考：
Android P Camera2架构-OpenCamera2流程Frameworks层到HAL层(1)
简单介绍新架构右半部分android.hardware.camera2.CameraManager
CameraManager的继承关系：
源码路径：
frameworks\base\core\java\android\hardware\camera2\CameraManager.java
谷歌原文解释：
A system service m
