我正在开发一个Android应用程序,并且需要将HTLM(也

  • 标签)显示到textView中。为此,我找到了这个TagHandler,但它引发了一个



    我试图了解原因,但是找不到解决方案。我对Android还是很陌生,所以请帮助我。
    public class HtmlTagHandler implements Html.TagHandler {
        private int mListItemCount = 0;
        private Vector<String> mListParents = new Vector<String>();
    
        @Override
        public void handleTag(final boolean opening, final String tag, Editable output, final XMLReader xmlReader) {
    
            if (tag.equals("ul") || tag.equals("ol") || tag.equals("dd")) {
                if (opening) {
                    mListParents.add(tag);
                } else mListParents.remove(tag);
    
                mListItemCount = 0;
            } else if (tag.equals("li") && !opening) {
                handleListTag(output);
            }
    
    
    
        }
    
    
    
        private void handleListTag(Editable output) {
            if (mListParents.lastElement().equals("ul")) {
                output.append("\n");
                String[] split = output.toString().split("\n");
    
                int lastIndex = split.length - 1;
                int start = output.length() - split[lastIndex].length() - 1;
                output.setSpan(new BulletSpan(15 * mListParents.size()), start, output.length(), 0);
            } else if (mListParents.lastElement().equals("ol")) {
                mListItemCount++;
    
                output.append("\n");
                String[] split = output.toString().split("\n");
    
                int lastIndex = split.length - 1;
                int start = output.length() - split[lastIndex].length() - 1;
                output.insert(start, mListItemCount + ". ");
                output.setSpan(new LeadingMarginSpan.Standard(15 * mListParents.size()), start, output.length(), 0);
            }
        }
    }
    

    最佳答案

    发现错误,只需在前面添加此if(start<output.length())即可解决

    output.setSpan()
    

    正确且有效的代码是这样的:
    public class HtmlTagHandler implements Html.TagHandler {
        private int mListItemCount = 0;
        private Vector<String> mListParents = new Vector<String>();
    
        @Override
        public void handleTag(final boolean opening, final String tag, Editable output, final XMLReader xmlReader) {
    
            if (tag.equals("ul") || tag.equals("ol") || tag.equals("dd")) {
                if (opening) {
                    mListParents.add(tag);
                } else mListParents.remove(tag);
    
                mListItemCount = 0;
            } else if (tag.equals("li") && !opening) {
                handleListTag(output);
            }
    
    
    
        }
    
    
    
        private void handleListTag(Editable output) {
            if (mListParents.lastElement().equals("ul")) {
                output.append("\n");
                String[] split = output.toString().split("\n");
    
                int lastIndex = split.length - 1;
                int start = output.length() - split[lastIndex].length() - 1;
                if(start<output.length())
                    output.setSpan(new BulletSpan(15 * mListParents.size()), start, output.length(), 0);
            } else if (mListParents.lastElement().equals("ol")) {
                mListItemCount++;
    
                output.append("\n");
                String[] split = output.toString().split("\n");
    
                int lastIndex = split.length - 1;
                int start = output.length() - split[lastIndex].length() - 1;
                output.insert(start, mListItemCount + ". ");
                if(start<output.length())
                   output.setSpan(new LeadingMarginSpan.Standard(15 * mListParents.size()), start, output.length(), 0);
            }
        }
        }
    

    更新:

    在上面的代码遇到其他麻烦之后,我开发了可以毫无异常(exception)地工作的代码,我希望它会有用。
    public class HtmlTagHandler implements Html.TagHandler {
        private int mListItemCount = 0;
        private Vector<String> mListParents = new Vector<String>();
        private Vector<Integer> mListCounter = new Vector<Integer>();
    
    
        @Override
        public void handleTag(final boolean opening, final String tag, Editable output, final XMLReader xmlReader) {
    
            if (tag.equals("ul") || tag.equals("ol") ) {
                if (opening) {
                    mListParents.add(mListParents.size(),tag);
                    mListCounter.add(mListCounter.size(),  0);
    
                } else {
                    Log.d("Bohhh"," tolgo "+mListParents.get(mListParents.size()-1));
                    mListParents.removeElementAt(mListParents.size()-1);
                    Log.d("Bohhh","lunghezza "+mListParents.size());
                    mListCounter.removeElementAt(mListCounter.size()-1);
    
                }
    
            } else if (tag.equals("li") && opening) {
                handleListTag(output);
            }
    
    
    
        }
    
    
    
        private void handleListTag(Editable output) {
    
            if (mListParents.lastElement().equals("ul")) {
               if(output.length()!=0)
                output.append("\n");
                for(int i=1;i<mListCounter.size();i++)
                    output.append("\t");
                output.append("• ");
               } else if (mListParents.lastElement().equals("ol")) {
                mListItemCount=            mListCounter.lastElement()+1;
                if(output.length()!=0)
                output.append("\n");
                for(int i=1;i<mListCounter.size();i++)
                    output.append("\t");
               output.append( mListItemCount + ". ");
               mListCounter.removeElementAt(mListCounter.size()-1);
               mListCounter.add(mListCounter.size(), mListItemCount);
          }
        }
    
    }
    

  • 09-09 22:00
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