android 中如何获取camera当前状态

    /**
     * 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;
    }