添加所需要的依赖框架：

implementation 'cn.yipianfengye.android:zxing-library:2.2'
implementation 'com.github.bumptech.glide:glide:4.1.1'

长按识别图片是否为二维码：

    /**
     * 长按webview图片
     */
    webView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                final WebView.HitTestResult htr = ((WebView) v).getHitTestResult();//获取所点击的内容
                if (htr.getType() == WebView.HitTestResult.IMAGE_TYPE //判断被点击的类型为图片
                        || htr.getType() == WebView.HitTestResult.IMAGE_ANCHOR_TYPE
                        || htr.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
                    imagePath = htr.getExtra();
                    analyzeBitmap(htr.getExtra(), new AnalyzeCallback() {
                        @Override
                        public void onAnalyzeSuccess(Bitmap mBitmap, final String result) {
                            List<String> list = new ArrayList<>();
                            list.add("保存图片到本地");
                            list.add("识别图中二维码");
                            showDialog(list, result);
                        }

                        @Override
                        public void onAnalyzeFailed() {
                            List<String> list = new ArrayList<>();
                            list.add("保存图片到本地");
                            showDialog(list, "");
                        }
                    });
                }
                return false;
            }
        });

    /**
     * 解析二维码图片工具类
     */
    public void analyzeBitmap(final String path, final AnalyzeCallback analyzeCallback) {
        Glide.with(getActivity()).load(path).into(new SimpleTarget<Drawable>() {
            @Override
            public void onResourceReady(Drawable resource, Transition<? super Drawable> transition) {
                BitmapDrawable bd = (BitmapDrawable) resource;
                mBitmap = bd.getBitmap();
                MultiFormatReader multiFormatReader = new MultiFormatReader();

                // 解码的参数
                Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(2);
                // 可以解析的编码类型
                Vector<BarcodeFormat> decodeFormats = new Vector<BarcodeFormat>();
                if (decodeFormats == null || decodeFormats.isEmpty()) {
                    decodeFormats = new Vector<BarcodeFormat>();

                    // 这里设置可扫描的类型，我这里选择了都支持
                    decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
                    decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
                    decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
                }
                hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
                // 设置继续的字符编码格式为UTF8
                // hints.put(DecodeHintType.CHARACTER_SET, "UTF8");
                // 设置解析配置参数
                multiFormatReader.setHints(hints);

                // 开始对图像资源解码
                Result rawResult = null;
                try {
                    rawResult = multiFormatReader.decodeWithState(new BinaryBitmap(new HybridBinarizer(new BitmapLuminanceSource(mBitmap))));
                } catch (Exception e) {
                    e.printStackTrace();
                }

                if (rawResult != null) {
                    if (analyzeCallback != null) {
                        analyzeCallback.onAnalyzeSuccess(mBitmap, rawResult.getText());
                    }
                } else {
                    if (analyzeCallback != null) {
                        analyzeCallback.onAnalyzeFailed();
                    }
                }
            }
        });
    }

    /**
     * 解析二维码结果
     */
    public interface AnalyzeCallback {

        void onAnalyzeSuccess(Bitmap mBitmap, String result);

        void onAnalyzeFailed();
    }

附：保存图片到本地的方法：

    private class SaveImage extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {
            String result = "";
            try {
                String sdcard = null;
                String sdStatus = Environment.getExternalStorageState();
                if (sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd卡是否可用
                    sdcard = Environment.getExternalStorageDirectory().getAbsolutePath();
                } else {
                    ToastUtil.show(getActivity(), "SD卡不可用");
                }
                File file = new File(sdcard + "/Download");
                if (!file.exists()) {
                    file.mkdirs();
                }
                file = new File(sdcard + "/Download/" + new Date().getTime() + ".jpg");
                InputStream inputStream = null;
                URL url = new URL(imagePath);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                conn.setConnectTimeout(20000);
                if (conn.getResponseCode() == 200) {
                    inputStream = conn.getInputStream();
                }
                byte[] buffer = new byte[4096];
                int len = 0;
                FileOutputStream outStream = new FileOutputStream(file);
                while ((len = inputStream.read(buffer)) != -1) {
                    outStream.write(buffer, 0, len);
                }
                outStream.close();
                result = "图片已保存至：" + file.getAbsolutePath();
            } catch (Exception e) {
                result = "保存失败！" + e.getLocalizedMessage();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            ToastUtil.show(getActivity(), result);
        }
    }

使用方法：

SaveImage saveImage = new SaveImage();
saveImage.execute();

注：Android 6.0以上需动态申请权限：WRITE_EXTERNAL_STORAGE，READ_EXTERNAL_STORAGE，才能保存图片到本地。