Android ClickableSpan 应用实例

package com.test;

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 Test2Activity extends Activity {
    /** Called when the activity is first created. */
    private TextView tv;
    private static Context ctx;
    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       tv = new TextView(this);
       ctx = this;

       String htmlLinkText = "";

       htmlLinkText = "aaaaaaaaaa"
         + "<a style=\"color:red;\" href=\"我是超链接……\">超链接点击事件</a>"
         + "aaaaaaaaaaaaaaaa";
       // 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
        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) {
        Toast.makeText(ctx, mUrl, Toast.LENGTH_LONG).show();
        widget.setBackgroundColor(Color.parseColor("#00000000"));
       }
    }
}