一、自定义字符串生成二维码

 /**
     * 使用 ZXing Android Embedded 生成二维码
     *
     * @param s
     * @return
     */
    public Bitmap encodeBitmap(String s) {
        Bitmap bitmap = null;
        BitMatrix result = null;
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        try {
            result = multiFormatWriter.encode(s, BarcodeFormat.QR_CODE, DensityUtils.dp2px(this, 300), DensityUtils.dp2px(this, 300));
            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
            bitmap = barcodeEncoder.createBitmap(result);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException iae) {
            return null;
        }
        return bitmap;
    }

二、选择本地图片识别

/**
     * 打开相册
     */

    public void openGallery() {
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
        photoPickerIntent.setType("image/*");
        photoPickerIntent.setAction(Intent.ACTION_GET_CONTENT);
        try {
            LogUtil.d(TAG, "can take picture");
            startActivityForResult(photoPickerIntent, REQUEST_CODE_GALLERY);
        } catch (Exception e) {
            e.printStackTrace();
            ToastUtil.showMessage("无法打开相册");
        }
    }

• 识别图片内的字符串

/**
     * 图片解码
     *
     * @param data
     * @return
     */
    public String decodeImage(Intent data) {
        Result result = null;
        String codeString = "";

        try {
            if (data != null) {
                File mFileTemp = new File(FileAccessor.IMAGE + "code" + FileAccessor.JPG);
                InputStream inputStream = getContentResolver().openInputStream(data.getData());
                FileOutputStream fileOutputStream = new FileOutputStream(mFileTemp);
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    fileOutputStream.write(buffer, 0, bytesRead);
                }
                fileOutputStream.close();
                inputStream.close();
                Bitmap bitmap = ImageFileCacheUtils.getInstance().getBitmap(mFileTemp);
                try {
                    if (bitmap != null) {
                        int width = bitmap.getWidth();
                        int height = bitmap.getHeight();
                        int[] pixels = new int[width * height];
                        bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
                        RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
                        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source));
                        Reader reader = new QRCodeReader();
                        try {
                            result = reader.decode(binaryBitmap);
                        } catch (NotFoundException | ChecksumException | FormatException e) {
                            e.printStackTrace();
                        }
                    }


                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            LogUtil.e(TAG, "Error while creating temp file");
        }
        if (result != null) {
            codeString = result.getText();
        }
        return codeString;
    }
/**
     * 获取bitmap
     *
     * @param file 文件
     * @return bitmap
     */
    public Bitmap getBitmap(File file) {
        if (file == null) {
            return null;
        }
        InputStream is = null;
        try {
            is = new BufferedInputStream(new FileInputStream(file));
            return BitmapFactory.decodeStream(is);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        } finally {
            CloseUtils.closeIO(is);
        }
    }