Android开发 封装生成二维码的方法，随用随调

public class ErWeiMaUtil {    public static void makeErWetMa(final Activity activity, final ImageView iv, final int pic, final String url) {        final String filePath = ErWeiMaUtil.getFileRoot(activity) + File.separator                + "qr_" + System.currentTimeMillis() + ".jpg";        final Bitmap bitmap = BitmapFactory.decodeResource(activity.getResources(), pic);        new Thread(new Runnable() {            @Override            public void run() {                boolean success =createQRImage(url.toString(), 800, 800, bitmap, filePath);                if (success) {                    activity.runOnUiThread(new Runnable() {                        @Override                        public void run() {                            iv.setImageBitmap(BitmapFactory.decodeFile(filePath));                        }                    });                }            }        }).start();    }    //文件存储根目录    @TargetApi(Build.VERSION_CODES.FROYO)    public static String getFileRoot(Context context) {        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            File external = context.getExternalFilesDir(null);            if (external != null) {                return external.getAbsolutePath();            }        }        return context.getFilesDir().getAbsolutePath();    }    public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) {        try {            if (content == null || "".equals(content)) {                return false;            }            Map<EncodeHintType, Object> hints = new HashMap<>();            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);            BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints);            int[] pixels = new int[widthPix * heightPix];            for (int y = 0; y < heightPix; y++) {                for (int x = 0; x < widthPix; x++) {                    if (bitMatrix.get(x, y)) {                        pixels[y * widthPix + x] = 0xff000000;                    } else {                        pixels[y * widthPix + x] = 0xffffffff;                    }                }            }            Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);            bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);            if (logoBm != null) {                bitmap = addLogo(bitmap, logoBm);            }            return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath));        } catch (WriterException | IOException e) {            e.printStackTrace();        }        return false;    }    /**     * 在二维码中间添加Logo图案     */    private static Bitmap addLogo(Bitmap src, Bitmap logo) {        if (src == null) {            return null;        }        if (logo == null) {            return src;        }        //获取图片的宽高        int srcWidth = src.getWidth();        int srcHeight = src.getHeight();        int logoWidth = logo.getWidth();        int logoHeight = logo.getHeight();        if (srcWidth == 0 || srcHeight == 0) {            return null;        }        if (logoWidth == 0 || logoHeight == 0) {            return src;        }        //logo大小为二维码整体大小的1/5        float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);        try {            Canvas canvas = new Canvas(bitmap);            canvas.drawBitmap(src, 0, 0, null);            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);            canvas.save(Canvas.ALL_SAVE_FLAG);            canvas.restore();        } catch (Exception e) {            bitmap = null;            e.getStackTrace();        }        return bitmap;    }}

调用：如下

shop_erweima = (ImageView) getActivity().findViewById(R.id.shop_erweima);url = "www.baidu.com";ErWeiMaUtil.makeErWetMa(getActivity(), shop_erweima, R.drawable.ya, url);

注意：调用之前一定要有zxing包