一、流程框架图

二、具体流程分析 

1、得到cameralist和对应的静态信息

目录如下：

 重点代码分析：

启动相机前，先要通过getCameraIdList获取camera的个数以及id，然后可以通过getCameraCharacteristics获取对应id camera的capabilities（静态信息）进行一些openCamera前的准备工作。 

2、打开相机

重点代码分析：

通过openCamera启动相机

其中mStateCallback如下

private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {

        @Override
        public void onOpened(CameraDevice cameraDevice) {
            int id = Integer.parseInt(cameraDevice.getId());
            Log.d(TAG, "onOpened " + id);
            mCameraOpenCloseLock.release();
            if (mPaused) {
                return;
            }
            mCameraDevice[id] = cameraDevice;
            mCameraOpened[id] = true;

            if (isBackCamera() && getCameraMode() == DUAL_MODE && id == BAYER_ID) {
                Message msg = mCameraHandler.obtainMessage(OPEN_CAMERA, MONO_ID, 0);
                mCameraHandler.sendMessage(msg);
            } else {
                mCamerasOpened = true;
                mActivity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mUI.onCameraOpened(mCurrentSceneMode.getCurrentId());
                    }
                });
                createSessions();
            }
        }

        @Override
        public void onDisconnected(CameraDevice cameraDevice) {
            int id = Integer.parseInt(cameraDevice.getId());