private final CharSequence getSmallTime() { Context context = getContext(); boolean is24 = DateFormat.is24HourFormat(context); LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale); final char MAGIC1 = '\uEF00'; final char MAGIC2 = '\uEF01'; SimpleDateFormat sdf; String format = is24 ? d.timeFormat24 : d.timeFormat12; // Add seconds to the format string format += ":ss"; if (!format.equals(mClockFormatString)) { /* * Search for an unquoted "a" in the format string, so we can * add dummy characters around it to let us find it again after * formatting and change its size. */ if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int a = -1; boolean quoted = false; for (int i = 0; i < format.length(); i++) { char c = format.charAt(i); if (c == ''') { quoted = !quoted; } if (!quoted && c == 'a') { a = i; break; } } if (a >= 0) { // Move a back so any whitespace before AM/PM is also in the alternate size. final int b = a; while (a > 0 && Character.isWhitespace(format.charAt(a-1))) { a--; } format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1); } } mClockFormat = sdf = new SimpleDateFormat(format); mClockFormatString = format; } else { sdf = mClockFormat; } String result = sdf.format(mCalendar.getTime()); if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int magic1 = result.indexOf(MAGIC1); int magic2 = result.indexOf(MAGIC2); if (magic1 >= 0 && magic2 > magic1) { SpannableStringBuilder formatted = new SpannableStringBuilder(result); if (AM_PM_STYLE == AM_PM_STYLE_GONE) { formatted.delete(magic1, magic2+1); } else { if (AM_PM_STYLE == AM_PM_STYLE_SMALL) { CharacterStyle style = new RelativeSizeSpan(0.7f); formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); } formatted.delete(magic2, magic2 + 1); formatted.delete(magic1, magic1 + 1); } return formatted; } } return result;}如何实时更新秒 protected void updateClock() { if (mDateFormat == null) { final String dateFormat = getContext().getString(R.string.system_ui_date_pattern); final Locale l = Locale.getDefault(); final String fmt = ICU.getBestDateTimePattern(dateFormat, l.toString()); mDateFormat = new SimpleDateFormat(fmt, l); } mCurrentTime.setTime(System.currentTimeMillis()); final String text = mDateFormat.format(mCurrentTime); if (!text.equals(mLastText)) { setText(text); mLastText = text; }

这段代码是一个 Android 应用中的时间显示控件的实现，其中 getSmallTime() 方法用于获取当前时间并格式化成一个小的时间字符串，包括小时、分钟和秒。在这个方法中，首先获取当前的时间格式，然后通过 SimpleDateFormat 进行格式化。在格式化过程中，如果时间格式中包含了 AM/PM，那么会在其前后添加特殊字符，以便在后续的处理中对其进行调整，并且将秒添加到时间格式中。最后返回格式化后的时间字符串，或者是一个 SpannableStringBuilder 对象，用于支持不同大小的 AM/PM 文字。而 updateClock() 方法则用于更新显示控件中的时间，并根据时间是否发生变化来更新显示内容。如果时间有更新，则将最新的时间字符串设置为控件的文本。

相关问题

private final CharSequence getSmallTime() { Context context = getContext(); boolean is24 = DateFormat.is24HourFormat(context); LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale); final char MAGIC1 = '\uEF00'; final char MAGIC2 = '\uEF01'; SimpleDateFormat sdf; String format = is24 ? d.timeFormat24 : d.timeFormat12; if (!format.equals(mClockFormatString)) { /* * Search for an unquoted "a" in the format string, so we can * add dummy characters around it to let us find it again after * formatting and change its size. */ if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int a = -1; boolean quoted = false; for (int i = 0; i < format.length(); i++) { char c = format.charAt(i); if (c == ''') { quoted = !quoted; } if (!quoted && c == 'a') { a = i; break; } } if (a >= 0) { // Move a back so any whitespace before AM/PM is also in the alternate size. final int b = a; while (a > 0 && Character.isWhitespace(format.charAt(a-1))) { a--; } format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1); } } mClockFormat = sdf = new SimpleDateFormat(format); mClockFormatString = format; } else { sdf = mClockFormat; } String result = sdf.format(mCalendar.getTime()); if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int magic1 = result.indexOf(MAGIC1); int magic2 = result.indexOf(MAGIC2); if (magic1 >= 0 && magic2 > magic1) { SpannableStringBuilder formatted = new SpannableStringBuilder(result); if (AM_PM_STYLE == AM_PM_STYLE_GONE) { formatted.delete(magic1, magic2+1); } else { if (AM_PM_STYLE == AM_PM_STYLE_SMALL) { CharacterStyle style = new RelativeSizeSpan(0.7f); formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); } formatted.delete(magic2, magic2 + 1); formatted.delete(magic1, magic1 + 1); } return formatted; } } return result; }添加秒

你的问题是如何在这段代码中添加秒？

这段代码的作用是获取当前时间并以指定格式显示出来，但没有显示秒数。要添加秒数，可以修改格式字符串。在这里，我们可以在格式字符串的末尾添加一个”：ss“，表示显示秒数。修改后的代码如下：

private final CharSequence getSmallTime() {
    Context context = getContext();
    boolean is24 = DateFormat.is24HourFormat(context);
    LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale);

    final char MAGIC1 = '\uEF00';
    final char MAGIC2 = '\uEF01';

    SimpleDateFormat sdf;
    String format = is24 ? d.timeFormat24 : d.timeFormat12;

    // Add seconds to the format string
    format += ":ss";

    if (!format.equals(mClockFormatString)) {
        /*
         * Search for an unquoted "a" in the format string, so we can
         * add dummy characters around it to let us find it again after
         * formatting and change its size.
         */
        if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
            int a = -1;
            boolean quoted = false;
            for (int i = 0; i < format.length(); i++) {
                char c = format.charAt(i);
                if (c == '\'') {
                    quoted = !quoted;
                }
                if (!quoted && c == 'a') {
                    a = i;
                    break;
                }
            }
            if (a >= 0) {
                // Move a back so any whitespace before AM/PM is also in the alternate size.
                final int b = a;
                while (a > 0 && Character.isWhitespace(format.charAt(a-1))) {
                    a--;
                }
                format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1);
            }
        }
        mClockFormat = sdf = new SimpleDateFormat(format);
        mClockFormatString = format;
    } else {
        sdf = mClockFormat;
    }

    String result = sdf.format(mCalendar.getTime());

    if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
        int magic1 = result.indexOf(MAGIC1);
        int magic2 = result.indexOf(MAGIC2);
        if (magic1 >= 0 && magic2 > magic1) {
            SpannableStringBuilder formatted = new SpannableStringBuilder(result);
            if (AM_PM_STYLE == AM_PM_STYLE_GONE) {
                formatted.delete(magic1, magic2+1);
            } else {
                if (AM_PM_STYLE == AM_PM_STYLE_SMALL) {
                    CharacterStyle style = new RelativeSizeSpan(0.7f);
                    formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                }
                formatted.delete(magic2, magic2 + 1);
                formatted.delete(magic1, magic1 + 1);
            }
            return formatted;
        }
    }
    return result;
}

在修改后的代码中，我们在格式字符串的末尾添加了一个冒号和“ss”，表示显示秒数。然后，我们将修改后的格式字符串传递给SimpleDateFormat对象，以便格式化当前时间。最后，我们返回格式化后的时间字符串，它包含了秒数。

The method makeText(Context, CharSequence, int) in the type Toast is not applicable for the argument...

这个错误提示意味着你使用了错误的参数来调用Toast.makeText()方法。正确的方法签名是：

public static Toast makeText(Context context, CharSequence text, int duration)

其中，第一个参数是应用程序的上下文，第二个参数是要显示的文本，第三个参数是Toast的持续时间。请确保你传递了正确的参数类型和值。如果你仍然遇到问题，请提供更多的代码以供参考。