自定义 textview上LINK的点击事件

package com.TextHtml;

import android.app.Activity;
import android.content.Context;
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 {
    /** Called when the activity is first created. */
    private TextView  tv;
    static Context ctx=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ctx=this;
        tv = (TextView) findViewById(R.id.tv); 
        String htmlLinkText = "<a href=\"http://www.baidu.com\"><u>我的CSDN博客 </u></a>";   
        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   
            for(URLSpan url : urls){   
                MyURLSpan myURLSpan = new MyURLSpan(url.getURL());   
                style.setSpan(myURLSpan,sp.getSpanStart(url),sp.getSpanEnd(url),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);   
            }   
            tv.setText(style);   
        }   

        
        
        
    }
    
    private static class MyURLSpan extends ClickableSpan{   
          
        private String mUrl;   
        MyURLSpan(String url) {   
            mUrl =url;   
        }   
        @Override
        public void onClick(View widget) {
            // TODO Auto-generated method stub
            Toast.makeText(ctx, "hello!",Toast.LENGTH_LONG).show();
        }   
    }
}