java - 剪下长串

Question

我有一根可能很长的绳子，需要巧妙地剪断它。下面的例子。
鉴于：

Very long string that is really too long to be placed on UI.

剪切以留下不超过N字母的字符串：

Very long string that is really too...

这不应该拆分以下单词：

Very long string that is real...

有没有完整的解决方案/库？

Answer 1

我会尝试类似的东西。

public static String truncate(String line, int maxLength) {
    if(line.length() < maxLength) return line;
    int pos = line.lastIndexOf(" ", maxLength-3);
    if (pos <= 0) pos = maxLength - 3; // no spaces, so just cut anyway
    return line.substring(0, pos) + "...";
}

Answer 2

您需要使用setEllipsize (TextUtils.TruncateAt where)。在此处找到的文档。

Answer 3

您可以使用此类并调用其静态方法。此方法将防止越界错误和空指针异常

公共类 SmartSubstring {

public static String smartSubstring(String str, int maxLength) {

    String subStr = str.substring(0);

    if (maxLength == 0) {
        return "";
    } else if (str.length() <= maxLength) {
        return str;
    } else {
        int i = maxLength;
        while (i >= 0) {
            while (str.length() < i) {
                i--;
            }
            if (str.charAt(i) == ' ') {
                subStr = str.substring(0, i);
                break;
            }
            i--;

        }
        return subStr;
    }
}

public static void main(String[] args) {
    String test = new String("Otomotopia is a very very long word that is "
            + "hard to contain in a mobile application screen");

    for (int i = 0; i < 200; i++) {
        String tester = SmartSubstring.smartSubstring(test, i);
        System.out.println(tester + tester.length());
    }
}
}

Answer 4

您可以使用 StringTokenizer 通过使用空格的单词来分割字符串，然后只输出前几个单词。这个链接有一个很好的例子： http ://www.mkyong.com/java/java-stringtokenizer-example/