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;@Overridepublic 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"));   }}}
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