Android开发：如何让TextView中含超链接的String对象正确显示可点击链接

问题根源 #

当前实现存在两个核心问题：

• 字符串内的<a>标签被转义成了HTML实体（<对应<、>对应>），无法直接被识别为HTML标签
• Linkify.addLinks()仅能识别纯文本中直接暴露的URL地址，无法解析封装在<a>标签内的超链接

修复代码示例 #

import android.text.Html;
import android.text.method.LinkMovementMethod;
import android.widget.TextView;

// 原有字符串定义
String description = "\"Cardano is a decentralised platform" +
        " that will allow complex programmable transfers of" +
        " value in a secure and scalable fashion. It is one" +
        " of the first blockchains to be built in the highly" +
        " secure Haskell programming language. Cardano is developing" +
        " a <a href=\\\"https://www.coingecko.com/en?category_id=29\\\">smart contract platform</a>" +
        " which seeks to deliver more advanced features than any protocol previously developed." +
        " It is the first blockchain platform to evolve out of a scientific philosophy and a research-first driven approach." +
        " The development team consists of a large global collective of expert engineers and researchers.\\r\\n\\r\\n" +
        "The Cardano project is different from other blockchain projects as it openly addresses the need for regulatory oversight whilst maintaining" +
        " consumer privacy and protections through an innovative software architecture.";

TextView textView = findViewById(R.id.description_textview);
// 第一步：还原转义的HTML实体，得到正常的HTML字符串
String unescapedHtml = Html.fromHtml(description, Html.FROM_HTML_MODE_LEGACY).toString();
// 第二步：解析HTML内容为带Span的富文本对象
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
    textView.setText(Html.fromHtml(unescapedHtml, Html.FROM_HTML_MODE_LEGACY));
} else {
    // 低版本Android兼容
    textView.setText(Html.fromHtml(unescapedHtml));
}
// 第三步：设置链接点击支持，必须添加否则超链接无法响应点击
textView.setMovementMethod(LinkMovementMethod.getInstance());

可选优化 #

如果需要自定义超链接颜色、去掉下划线、自定义点击逻辑，可以通过重写ClickableSpan实现：

• 遍历解析后的Spanned对象里的所有URLSpan
• 替换为自定义的ClickableSpan，修改样式和点击逻辑

内容的提问来源于stack exchange，提问作者AtomicallyBeyond