有人采用这样一种方式来检测html中的图片？是在是匪夷所思啊！

public class HtmlScraper {
  /**
   * Scrapes an HTML page for <img> tags.
   *
   * @return Scraped plain text
   */
  public static String parseWithImageTags(
      String htmlText,
      @Nullable String originUrl,
      List<String> outImageUrls) {
    ExtractImageGetter imageGetter = new ExtractImageGetter(originUrl, outImageUrls);
    String strippedText = Html.fromHtml(
        htmlText,
        imageGetter,
        null /* tagHandler */)
        .toString();

    return strippedText.trim();
  }

  private static class ExtractImageGetter implements Html.ImageGetter {
    @Nullable private final String mOriginUrl;
    private final List<String> mSources;

    public ExtractImageGetter(@Nullable String originUrl, List<String> outSources) {
      mOriginUrl = originUrl;
      mSources = outSources;
    }

    @Override
    public Drawable getDrawable(String source) {
      if (mOriginUrl != null && TextUtils.isEmpty(Uri.parse(source).getScheme())) {
        StringBuilder newSource = new StringBuilder();
        newSource.append(mOriginUrl);
        if (!mOriginUrl.endsWith("/") && !source.startsWith("/")) {
          newSource.append("/");
        }
        newSource.append(source);
        source = newSource.toString();
      }
      mSources.add(source);

      // Dummy drawable.
      return new ColorDrawable(Color.TRANSPARENT);
    }

    public List<String> getSources() {
      return mSources;
    }
  }
}

最后图片将会提取到outImageUrls中，但是，这种效率真的要比正则匹配要好吗？

public void parseSubTree(XmlPullParser pp) throws SAXException, IOException {
        this.pp = pp;
        final boolean namespaceAware = pp.getFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES);
        try {
            if(pp.getEventType() != XmlPullParser.START_TAG) {
                throw new SAXException(
                    "start tag must be read before skiping subtree"+pp.getPositionDescription());
            }
            final int[] holderForStartAndLength = new int[2];
            final StringBuilder rawName = new StringBuilder(16);
            String prefix = null;
            String name = null;
            int level = pp.getDepth() - 1;
            int type = XmlPullParser.START_TAG;

            LOOP:
            do {
                switch(type) {
                    case XmlPullParser.START_TAG:
                        if(namespaceAware) {
                            final int depth = pp.getDepth() - 1;
                            final int countPrev =
                                (level > depth) ? pp.getNamespaceCount(depth) : 0;
                            //int countPrev = pp.getNamespaceCount(pp.getDepth() - 1);
                            final int count = pp.getNamespaceCount(depth + 1);
                            for (int i = countPrev; i < count; i++)
                            {
                                contentHandler.startPrefixMapping(
                                    pp.getNamespacePrefix(i),
                                    pp.getNamespaceUri(i)
                                );
                            }
                            name = pp.getName();
                            prefix = pp.getPrefix();
                            if(prefix != null) {
                                rawName.setLength(0);
                                rawName.append(prefix);
                                rawName.append(':');
                                rawName.append(name);
                            }
                            startElement(pp.getNamespace(),
                                         name,
                                         // TODO Fixed this. Was "not equals".
                                         prefix == null ? name : rawName.toString());
                        } else {
                            startElement(pp.getNamespace(),
                                         pp.getName(),
                                         pp.getName());
                        }
                        //++level;

                        break;
                    case XmlPullParser.TEXT:
                        final char[] chars = pp.getTextCharacters(holderForStartAndLength);
                        contentHandler.characters(chars,
                                                  holderForStartAndLength[0], //start
                                                  holderForStartAndLength[1] //len
                                                 );
                        break;
                    case XmlPullParser.END_TAG:
                        //--level;
                        if(namespaceAware) {
                            name = pp.getName();
                            prefix = pp.getPrefix();
                            if(prefix != null) {
                                rawName.setLength(0);
                                rawName.append(prefix);
                                rawName.append(':');
                                rawName.append(name);
                            }
                            contentHandler.endElement(pp.getNamespace(),
                                                      name,
                                                      prefix != null ? name : rawName.toString()
                                                     );
                            // when entering show prefixes for all levels!!!!
                            final int depth = pp.getDepth();
                            final int countPrev =
                                (level > depth) ? pp.getNamespaceCount(pp.getDepth()) : 0;
                            int count = pp.getNamespaceCount(pp.getDepth() - 1);
                            // undeclare them in reverse order
                            for (int i = count - 1; i >= countPrev; i--)
                            {
                                contentHandler.endPrefixMapping(
                                    pp.getNamespacePrefix(i)
                                );
                            }
                        } else {
                            contentHandler.endElement(pp.getNamespace(),
                                                      pp.getName(),
                                                      pp.getName()
                                                     );

                        }
                        break;
                    case XmlPullParser.END_DOCUMENT:
                        break LOOP;
                }
                type = pp.next();
            } while(pp.getDepth() > level);
        } catch (XmlPullParserException ex)  {
            final SAXParseException saxException = new SAXParseException("parsing error: "+ex, this, ex);
            ex.printStackTrace();
            errorHandler.fatalError(saxException);
        }
    }

反正就是去解析xml

private void handleStartTag(String tag, Attributes attributes) {
        if (tag.equalsIgnoreCase("br")) {
            // We don't need to handle this. TagSoup will ensure that there's a </br> for each <br>
            // so we can safely emite the linebreaks when we handle the close tag.
        } else if (tag.equalsIgnoreCase("p")) {
            handleP(mSpannableStringBuilder);
        } else if (tag.equalsIgnoreCase("div")) {
            handleP(mSpannableStringBuilder);
        } else if (tag.equalsIgnoreCase("strong")) {
            start(mSpannableStringBuilder, new Bold());
        } else if (tag.equalsIgnoreCase("b")) {
            start(mSpannableStringBuilder, new Bold());
        } else if (tag.equalsIgnoreCase("em")) {
            start(mSpannableStringBuilder, new Italic());
        } else if (tag.equalsIgnoreCase("cite")) {
            start(mSpannableStringBuilder, new Italic());
        } else if (tag.equalsIgnoreCase("dfn")) {
            start(mSpannableStringBuilder, new Italic());
        } else if (tag.equalsIgnoreCase("i")) {
            start(mSpannableStringBuilder, new Italic());
        } else if (tag.equalsIgnoreCase("big")) {
            start(mSpannableStringBuilder, new Big());
        } else if (tag.equalsIgnoreCase("small")) {
            start(mSpannableStringBuilder, new Small());
        } else if (tag.equalsIgnoreCase("font")) {
            startFont(mSpannableStringBuilder, attributes);
        } else if (tag.equalsIgnoreCase("blockquote")) {
            handleP(mSpannableStringBuilder);
            start(mSpannableStringBuilder, new Blockquote());
        } else if (tag.equalsIgnoreCase("tt")) {
            start(mSpannableStringBuilder, new Monospace());
        } else if (tag.equalsIgnoreCase("a")) {
            startA(mSpannableStringBuilder, attributes);
        } else if (tag.equalsIgnoreCase("u")) {
            start(mSpannableStringBuilder, new Underline());
        } else if (tag.equalsIgnoreCase("sup")) {
            start(mSpannableStringBuilder, new Super());
        } else if (tag.equalsIgnoreCase("sub")) {
            start(mSpannableStringBuilder, new Sub());
        } else if (tag.length() == 2 &&
                   Character.toLowerCase(tag.charAt(0)) == 'h' &&
                   tag.charAt(1) >= '1' && tag.charAt(1) <= '6') {
            handleP(mSpannableStringBuilder);
            start(mSpannableStringBuilder, new Header(tag.charAt(1) - '1'));
        } else if (tag.equalsIgnoreCase("img")) {
            startImg(mSpannableStringBuilder, attributes, mImageGetter);
        } else if (mTagHandler != null) {
            mTagHandler.handleTag(true, tag, mSpannableStringBuilder, mReader);
        }
    }

image.png

其实把，如果让我实现，我肯定想不到使用这个方法，我肯定是这么想的，引入一个jquery类似的解析库，
$("<img>").foreach({$0.src})这样的拿出链接了。