/**

     * 测试当前摄像头能否被使用

     *

     * @return

     */

    public static boolean isCameraCanUse() {

        boolean canUse = true;

        Camera mCamera = null;

        try {

            // TODO camera驱动挂掉,处理??

            mCamera = Camera.open();

        } catch (Exception e) {

            canUse = false;

        }

        if(mCamera == null){

            canUse = false;

        }

        if (canUse) {

            mCamera.release();

            mCamera = null;

        }

        return canUse;

    }