android TextView中超链接的事件捕捉

Java代码 
package com.cm;   
   
import java.util.ArrayList;   
   
import android.R.color;   
import android.app.Activity;   
import android.content.Context;   
import android.graphics.Color;   
import android.os.Bundle;   
import android.text.Html;   
import android.text.Spannable;   
import android.text.SpannableStringBuilder;   
import android.text.method.LinkMovementMethod;   
import android.text.style.ClickableSpan;   
import android.text.style.URLSpan;   
import android.view.View;   
import android.widget.TextView;   
import android.widget.Toast;   
   
public class TextHtml extends Activity {   
    private TextView tv;   
    private static Context ctx;   
   
    @Override   
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);   
   
        tv = new TextView(this);   
        ctx = this;   
   
        String htmlLinkText =  "我是超链接"+ "<a style=\"color:red;\" href='lianjie'>超链接点击事件</a>";   
        // 文字的样式（style）被覆盖，不能改变……   
   
        tv.setText(Html.fromHtml(htmlLinkText));   
        tv.setMovementMethod(LinkMovementMethod.getInstance());   
        CharSequence text = tv.getText();   
        if (text instanceof Spannable) {   
            int end = text.length();   
            Spannable sp = (Spannable) tv.getText();   
            URLSpan[] urls = sp.getSpans(0, end, URLSpan.class);   
            SpannableStringBuilder style = new SpannableStringBuilder(text);   
            style.clearSpans();// should clear old spans   
   
            //循环把链接发过去             
            for (URLSpan url : urls) {   
                MyURLSpan myURLSpan = new MyURLSpan(url.getURL());   
                style.setSpan(myURLSpan, sp.getSpanStart(url),   
                        sp.getSpanEnd(url), Spannable.SPAN_EXCLUSIVE_INCLUSIVE);   
            }   
            tv.setText(style);   
        }   
        setContentView(tv);   
   
    }   
   
    private static class MyURLSpan extends ClickableSpan {   
   
        private String mUrl;   
   
        MyURLSpan(String url) {   
            mUrl = url;   
        }   
   
        @Override   
        public void onClick(View widget) {   
            if(mUrl .equal(lianjie)){   
                Toast.makeText(ctx, mUrl, Toast.LENGTH_LONG).show();   
                widget.setBackgroundColor(Color.parseColor("#00000000"));   
   
            }   
        }   
    }   
}