生成二维码工具类

导入：

compile 'com.google.zxing:core:3.3.0'

工具类：

public class QRUtil {//    使用样例//    ImageView mQRCode = (ImageView) mView.findViewById(R.id.qrcode);//    Bitmap bitmap = Utils.createQRImage(context, mQRCode, info);//    if (bitmap != null && !bitmap.isRecycled()){//        mQRCode.setImageBitmap(bitmap);//    }    public static Bitmap createQRImage(Context context, View view, String id)    {        try        {            if (id == null || id.isEmpty())            {                return null;            }            int width = 520;            int height = 520;            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8");            BitMatrix bitMatrix = new QRCodeWriter().encode(id, BarcodeFormat.QR_CODE, width, height, hints);            bitMatrix = deleteWhite(bitMatrix);            int[] rec = bitMatrix.getEnclosingRectangle();            width = rec[2] + 1; height = rec[3] + 1;            int[] pixels = new int[width * height];            for (int y = 0; y < height; y++)            {                for (int x = 0; x < width; x++)                {                    if (bitMatrix.get(x, y)) {                        pixels[y * width + x] = 0xff000000;                    }                    else                    {                        pixels[y * width + x] = 0xffffffff;                    }                }            }            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);            return bitmap;        } catch (WriterException e) {            e.printStackTrace();        } return null;    }    public static BitMatrix deleteWhite(BitMatrix matrix) {        int[] rec = matrix.getEnclosingRectangle();        int resWidth = rec[2] + 1;        int resHeight = rec[3] + 1;        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);        resMatrix.clear();        for (int i = 0; i < resWidth; i++) {            for (int j = 0; j < resHeight; j++) {                if (matrix.get(i + rec[0], j + rec[1])) {                    resMatrix.set(i, j);                }            }        }        return resMatrix;    }}