QR二维码的源代码，是调用google的API，用以识别和生成二维码，内容比较简单，适合初学者学习-QR two-dimensional code, source code, called google API to identify and generate a two-dimensional code, the content is relatively simple for beginners to learn

实现二维码的扫描识别与生成二维码。还能开启闪光灯和扫描相册中的二维码。(Realize two-dimensional code scanning recognition and generate two-dimensional code. You can also turn on the flash and scan the QR code in the album.)