Android Linkify小写URL

Question

我有一个网址的一些大写字母，如http://myserver.com/apps/DroidApp.apk

当我将这个url传递给Android Linkify时，结果链接的字母大小写改为http://myserver.com/apps/droidapp.apk

TextView upgradeLink = (TextView) findViewById(R.id.upgradeNow);
upgradeLink.setText("Download now.");
Pattern pattern = Pattern.compile("Download");
String scheme = "http://myserver.com/apps/DroidApp.apk+"?action=";
Log.e(MY_DEBUG_TAG,"Schema URL "+scheme); // printed http://myserver.com/apps/DroidApp.apk?action=
Linkify.addLinks(upgradeLink, pattern, scheme);

我怎么才能克服这个呢？

Answer 1

在内部，Linkify调用

public static final boolean addLinks(Spannable s, Pattern p, String scheme, null, null)

检查code for that method：

public static final boolean addLinks(Spannable s, Pattern p,
        String scheme, MatchFilter matchFilter,
        TransformFilter transformFilter) {
    boolean hasMatches = false;
    String prefix = (scheme == null) ? "" : scheme.toLowerCase(); // <-- here is the problem!
    Matcher m = p.matcher(s);

    while (m.find()) {
        int start = m.start();
        int end = m.end();
        boolean allowed = true;

        if (matchFilter != null) {
            allowed = matchFilter.acceptMatch(s, start, end);
        }

        if (allowed) {
            String url = makeUrl(m.group(0), new String[] { prefix },
                                 m, transformFilter);

            applyLink(url, start, end, s);
            hasMatches = true;
        }
    }

    return hasMatches;
}

扩展Linkify并覆盖此方法，删除scheme.toLowerCase()位。

Answer 2

您可以添加helper函数来更改Linkify修改的urls

/***
   * hyperlinks @toThis to @linkThis in the given @textView
***/
fun addLinks(textView: TextView, linkThis: String, toThis: String) {
   val pattern = Pattern.compile(linkThis, Pattern.CASE_INSENSITIVE)
   android.text.util.Linkify.addLinks(textView, pattern, toThis, { s, start, end -> true }, { match, url -> "" })
  //Maintain url case
  val spanText = textView.text
  if(spanText !is Spannable) return // no need to process since there are no URLSpans
      val matcher = pattern.matcher(linkThis)
      while (matcher.find()) {
      val span = spanText.getSpans(matcher.start(), matcher.end(), URLSpan::class.java).first()
      val spanFlags = spanText.getSpanFlags(span)
      spanText.removeSpan(span) //remove modified url added by linkify
      spanText.setSpan(URLSpan(toThis), matcher.start(), matcher.end(), spanFlags) //add the original url
      }
      textView.text = spanText
   }