android 自定义TextView中Html超链接点击事件详解

public class TextHtmlActivity extends Activity {
private TextView text;
private Activity mActivty;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text_html_layout);
mActivty = this;
text  = (TextView) findViewById(R.id.text);
text.setText(Html.fromHtml("<b>text3:</b>  " +
"Text with a " + "<a href=\"http://www.baidu.com\">link</a> " +
"点击这个连接---"+
"<a href=\"http://www.dewen.io/q/1744\">连接</a> "+
"created in the Java source code using HTML."));
text.setMovementMethod(LinkMovementMethod.getInstance());
CharSequence str = text.getText();
if(str instanceof Spannable){
int end = str.length();
Spannable sp = (Spannable)text.getText();  //构建Spannable对象、继承Spanned、Spanned对象继承CharSequener
URLSpan[] urls=sp.getSpans(0, end, URLSpan.class);  //找出text中的a标签
//SpannableStringBuilder、SpannableString对象跟String对象差不多、只是比String对象多setSpan，
//可以给字符串设置样式、大小、背景色...而 SpannableStringBuilder跟SpannableString的关系就跟String跟StringBuffer关系一样
SpannableStringBuilder style=new SpannableStringBuilder(str);
style.clearSpans();//should clear old spans
for(URLSpan url : urls){
MyClickSpan myURLSpan = new MyClickSpan();
//设置样式其中参数what是具体样式的实现对象，start则是该样式开始的位置，end对应的是样式结束的位置，
// 参数 flags，定义在Spannable中的常量
style.setSpan(myURLSpan,sp.getSpanStart(url),sp.getSpanEnd(url),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
text.setText(style);
}

}
private class MyClickSpan extends ClickableSpan{
@Override
public void updateDrawState(TextPaint ds) {
ds.setUnderlineText(false);
super.updateDrawState(ds);
}
@Override
public void onClick(View widget) {
Toast.makeText(mActivty,"click link",Toast.LENGTH_SHORT).show();
}
}
}