android中有的时候需要在TextView上设置一些超链接，点击这些超链接时进行一些操作。例如新浪微博上的一些关键字，点击时会跳转到相应的页面。
如何实现我们就直接看源码吧。
/**
*
* created by Mr.Simple, Aug 21, 20141:51:40 PM.
* Copyright (c) 2014, hehonghui@umeng.com All Rights Reserved.
*
* #####################################################
* # #
* # _oo0oo_ #
* # o8888888o #
* # 88" . "88 #
* # (| -_- |) #
* # 0\ = /0 #
* # ___/`---‘\___ #
* # .‘ \\| |# ‘. #
* # / \\||| : |||# \ #
* # / _||||| -:- |||||- \ #
* # | | \\\ - #/ | | #
* # | \_| ‘‘\---/‘‘ |_/ | #
* # \ .-\__ ‘-‘ ___/-. / #
* # ___‘. .‘ /--.--\ `. .‘___ #
* # ."" ‘< `.___\_<|>_/___.‘ >‘ "". #
* # | | : `- \`.;`\ _ /`;.`/ - ` : | | #
* # \ \ `_. \_ __\ /__ _/ .-` / / #
* # =====`-.____`.___ \_____/___.-`___.-‘===== #
* # `=---=‘ #
* # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
* # #
* # 佛祖保佑 永无BUG #
* # #
* #####################################################
*/
package com.umeng.community.utils;
import android.content.Context;
import android.text.Html;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.TextPaint;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.text.style.URLSpan;
import android.widget.TextView;
/**
* @author mrsimple
*/
public abstract class TopicSpanWrapper extends ClickableSpan {
protected Context mContext;
protected TextView mTextView;
/**
* @param context
* @param tv
*/
public TopicSpanWrapper(Context context, TextView tv) {
mContext = context;
mTextView = tv;
updateClickSpan(tv);
}
/**
* 更新Span
*
* @param rv
*/
public void updateClickSpan(TextView tv) {
// 这里拼接超链接, 我在前后加了一个井号,可自行去除
String htmlLinkText = "<a href=‘这里可以填写某个url‘>#" + tv.getText().toString() + "#</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) {
// 设置Span
style.setSpan(this, sp.getSpanStart(url), sp.getSpanEnd(url),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
tv.setText(style);
}
}
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
// 去掉超链接的下划线
ds.setUnderlineText(false);
}
}
使用示例 :
public class UserInfoActivity extends FragmentActivity implements OnClickListener {
FragmentManager mFragmentMan;
private TextView mUserNameTv;
/*
* (non-Javadoc)
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.umeng_comm_user_info);
initUIComponents();
}
/**
*
*/
private void initUIComponents() {
mFragmentMan = getSupportFragmentManager();
mPostedFragment = new PostedFragment();
mFragmentMan
.beginTransaction()
.add(R.id.user_info_fragment_container, mPostedFragment,
PostedFragment.class.getSimpleName()).commit();
// 布局就不给出了,总之user_name_tv是一个TextView
mUserNameTv = (TextView) findViewById(R.id.user_name_tv);
/**
* 将TextView中的文本包装成可点击的超链接
*/
new TopicSpanWrapper(this, mUserNameTv) {
@Override
public void onClick(View widget) {
Toast.makeText(mContext, "点击了超链接文本", Toast.LENGTH_SHORT).show();
}
};
}
}
效果如图 :
点击以后
图片中Toast的文字和代码的不一致，是因为文中写的与我demo中的文字不一样，直接忽略这个问题即可。