HtmlTagHandler.java

package com.mobidev.newsapp.utils;

import java.util.Vector;

import org.xml.sax.XMLReader;

import android.text.Editable;
import android.text.Html;
import android.text.Spannable;
import android.text.style.BulletSpan;
import android.text.style.LeadingMarginSpan;
import android.text.style.TypefaceSpan;
import android.util.Log;

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);
		} else if (tag.equalsIgnoreCase("code")) {
			if (opening) {
				output.setSpan(new TypefaceSpan("monospace"), output.length(),
						output.length(), Spannable.SPAN_MARK_MARK);
			} else {
				Log.d("COde Tag", "Code tag encountered");
				Object obj = getLast(output, TypefaceSpan.class);
				int where = output.getSpanStart(obj);
				output.setSpan(new TypefaceSpan("monospace"), where,
						output.length(), 0);
			}
		}
	}

	private Object getLast(Editable text, Class kind) {
		Object[] objs = text.getSpans(0, text.length(), kind);
		if (objs.length == 0) {
			return null;
		} else {
			for (int i = objs.length; i > 0; i--) {
				if (text.getSpanFlags(objs[i - 1]) == Spannable.SPAN_MARK_MARK) {
					return objs[i - 1];
				}
			}
			return null;
		}
	}

	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);
		}
	}
}