TextView顯示Html和處理鏈接

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tvDialogContent.setText(Html.fromHtml(content, null, new CustomTagHandler(getContext(), tvDialogContent.getTextColors())));
textHtmlClick(getContext(), tvDialogContent);

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.graphics.Color;
import android.text.Editable;
import android.text.Html;
import android.text.Spannable;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.text.style.TextAppearanceSpan;
import android.util.Log;
import org.xml.sax.XMLReader;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class CustomTagHandler implements Html.TagHandler {
    private final String TAG = "CustomTagHandler";

    private int startIndex = 0;
    private int stopIndex = 0;

    private ColorStateList mOriginColors;
    private Context mContext;

    public CustomTagHandler(Context context,ColorStateList originColors){
        mContext = context;
        mOriginColors = originColors;
    }

    @Override
    public void handleTag(boolean opening, String tag, Editable output,
                          XMLReader xmlReader) {
        processAttributes(xmlReader);

        if(tag.equalsIgnoreCase("span")){
            if(opening){
                startSpan(tag, output, xmlReader);
            }else{
                endSpan(tag, output, xmlReader);
                attributes.clear();
            }
        }

    }

    public void startSpan(String tag, Editable output, XMLReader xmlReader) {
        startIndex = output.length();
    }

    public void endSpan(String tag, Editable output, XMLReader xmlReader){
        stopIndex = output.length();

        String color = attributes.get("color");
        String size = attributes.get("size");
        String style = attributes.get("style");
        if (!TextUtils.isEmpty(style)){
            analysisStyle(startIndex,stopIndex,output,style);
        }
        if (!TextUtils.isEmpty(size)) {
            size = size.split("px")[0];
        }
        if(!TextUtils.isEmpty(color)){
            if (color.startsWith("@")) {
                Resources res = Resources.getSystem();
                String name = color.substring(1);
                int colorRes = res.getIdentifier(name, "color", "android");
                if (colorRes != 0) {
                    output.setSpan(new ForegroundColorSpan(colorRes), startIndex, stopIndex,  Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                }
            } else {
                try {
                    output.setSpan(new ForegroundColorSpan(Color.parseColor(color)), startIndex, stopIndex,  Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                } catch (Exception e) {
                    e.printStackTrace();
                    reductionFontColor(startIndex,stopIndex,output);
                }
            }
        }
//        if (!TextUtils.isEmpty(size)) {
//            int fontSizePx = 16;
//            if (null != mContext){
//                fontSizePx = DisplayUtil.sp2px(mContext,Integer.parseInt(size));
//            }
//            output.setSpan(new AbsoluteSizeSpan(fontSizePx), startIndex, stopIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
//        }
    }

    final HashMap<String, String> attributes = new HashMap<String, String>();

    private void processAttributes(final XMLReader xmlReader) {
        try {
            Field elementField = xmlReader.getClass().getDeclaredField("theNewElement");
            elementField.setAccessible(true);
            Object element = elementField.get(xmlReader);
            Field attsField = element.getClass().getDeclaredField("theAtts");
            attsField.setAccessible(true);
            Object atts = attsField.get(element);
            Field dataField = atts.getClass().getDeclaredField("data");
            dataField.setAccessible(true);
            String[] data = (String[])dataField.get(atts);
            Field lengthField = atts.getClass().getDeclaredField("length");
            lengthField.setAccessible(true);
            int len = (Integer)lengthField.get(atts);

            /**
             * MSH: Look for supported attributes and add to hash map.
             * This is as tight as things can get :)
             * The data index is "just" where the keys and values are stored.
             */
            for(int i = 0; i < len; i++)
                attributes.put(data[i * 5 + 1], data[i * 5 + 4]);
        }
        catch (Exception e) {
        }
    }

    /**
     * 還原爲原來的顏色
     * @param startIndex
     * @param stopIndex
     * @param editable
     */
    private void reductionFontColor(int startIndex,int stopIndex,Editable editable){
        if (null != mOriginColors){
            editable.setSpan(new TextAppearanceSpan(null, 0, 0, mOriginColors, null),
                    startIndex, stopIndex,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        }else {
            editable.setSpan(new ForegroundColorSpan(0xff2b2b2b), startIndex, stopIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
    }

    /**
     * 解析style屬性
     * @param startIndex
     * @param stopIndex
     * @param editable
     * @param style
     */
    private void analysisStyle(int startIndex,int stopIndex,Editable editable,String style){
        Log.e(TAG,"style："+style);
        String[] attrArray = style.split(";");
        Map<String,String> attrMap = new HashMap<>();
        if (null != attrArray){
            for (String attr:attrArray){
                String[] keyValueArray = attr.split(":");
                if (null != keyValueArray && keyValueArray.length == 2){
                    // 記住要去除前後空格
                    attrMap.put(keyValueArray[0].trim(),keyValueArray[1].trim());
                }
            }
        }
        Log.e(TAG,"attrMap："+attrMap.toString());

        String color = attrMap.get("color");
//        String fontSize = attrMap.get("font-size");
//        if (!TextUtils.isEmpty(fontSize)) {
//            fontSize = fontSize.split("px")[0];
//        }
        if(!TextUtils.isEmpty(color)){
            if (color.startsWith("@")) {
                Resources res = Resources.getSystem();
                String name = color.substring(1);
                int colorRes = res.getIdentifier(name, "color", "android");
                if (colorRes != 0) {
                    editable.setSpan(new ForegroundColorSpan(colorRes), startIndex, stopIndex,  Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                }
            } else {
                try {
                    editable.setSpan(new ForegroundColorSpan(Color.parseColor(color)), startIndex, stopIndex,  Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                } catch (Exception e) {
                    e.printStackTrace();
                    reductionFontColor(startIndex,stopIndex,editable);
                }
            }
        }
//        if (!TextUtils.isEmpty(fontSize)) {
//            int fontSizePx = 16;
//            if (null != mContext){
//                fontSizePx = DisplayUtil.sp2px(mContext,Integer.parseInt(fontSize));
//            }
//            editable.setSpan(new AbsoluteSizeSpan(fontSizePx), startIndex, stopIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
//        }
    }

}

  /**
     * 處理html文本超鏈接點擊事件
     *
     * @param context
     * @param tv
     */
    public static void textHtmlClick(Context context, TextView tv) {
        tv.setMovementMethod(LinkMovementMethod.getInstance());
        CharSequence text = tv.getText();
        if (text instanceof Spannable) {
            int end = text.length();
            Spannable sp = (Spannable) text;
            URLSpan[] urls = sp.getSpans(0, end, URLSpan.class);
            SpannableStringBuilder style = new SpannableStringBuilder(text);
            style.clearSpans();// should clear old spans
            for (URLSpan url : urls) {
                LinkURLSpan linkURLSpan = new LinkURLSpan(url.getURL(), context);

                style.setSpan(linkURLSpan, sp.getSpanStart(url),
                        sp.getSpanEnd(url), Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                style.setSpan(new ForegroundColorSpan(UIUtils.getColor(R.color.app_main_color)), sp.getSpanStart(url), sp.getSpanEnd(url), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
            tv.setText(style);
        }
    }

    private static class LinkURLSpan extends ClickableSpan {
        private String mUrl;
        private Context mContext;

        LinkURLSpan(String url, Context context) {
            mContext = context;
            mUrl = url;
        }

        @Override
        public void onClick(View widget) {
            TextView tv = (TextView) widget;
            String content = tv
                    .getText()
                    .subSequence(tv.getSelectionStart(),
                            tv.getSelectionEnd()).toString();

            Intent intent = new Intent(mContext, LoadWebActivity.class);
            intent.putExtra("url", mUrl);
            intent.putExtra("title", content);
            mContext.startActivity(intent);

        }

        @Override
        public void updateDrawState(TextPaint ds) {
        	//取消下劃線
            ds.setUnderlineText(false);
        }
    }