java - indexOf ("@") Java 中的方法

Question

为什么这总是返回-1？这与'@'是注释符号有什么关系吗？

如何搜索以“@”开头的子字符串的第一次出现？

 UserMentionEntity[] userMentionEntities = status.getUserMentionEntities();
    for (UserMentionEntity ume : userMentionEntities) {
        final String mention = ume.getText();
        int mentionStart = text.indexOf("@" + mention);
        int mentionEnd = mentionStart + mention.length();
        ss.setSpan(new ForegroundColorSpan(Color.parseColor(COLOR)), mentionStart, mentionEnd + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    }

显然，mentionStart 为 -1。我正在使用 twitter4j 库。

示例:

text: RT @Cornerstone_TMC Thank you @ukgdos at sa lahat ng nag-abang kanina kay @yengpluggedin! #SeenZoned @academyofrocksg… http://t.co/rsLqjlZJgg
mention: ukgdos

Answer 1

没有。您的字符串不包含您认为的内容，

String mention = "not";
String text = "I do @not think so.";
int mentionStart = text.indexOf("@" + mention); 
System.out.printf("%d%n", mentionStart);

打印

5

编辑

根据您现在提供的文本和提及

String text = "RT @Cornerstone_TMC Thank you @ukgdos "
    + "at sa lahat ng nag-abang kanina kay @yengpluggedin! "
    + "#SeenZoned @academyofrocksg… http://t.co/rsLqjlZJgg";
String mention = "ukgdos";
int mentionStart = text.indexOf("@" + mention); 
System.out.printf("%d%n", mentionStart);

打印

30