如何检查系统是 12 小时制还是 24 小时制？

Question

我正在尝试确定当前语言环境是设置为 12 小时还是 24 小时，并相应地设置上午/下午。这是我现在得到的，但它一直显示上午/下午，无论它是否设置为 24。

 if (DateFormat.is24HourFormat(this))
{
    mHour = mCalendar.get(Calendar.HOUR_OF_DAY);
    int hourOfDay = mHour;
    if (hourOfDay>12)
        views.setTextViewText(R.id.AMPM, "pm");
    if (hourOfDay==12)
        views.setTextViewText(R.id.AMPM, "pm");
    if (hourOfDay<12)
        views.setTextViewText(R.id.AMPM, "am");
}
else {
    views.setTextViewText(R.id.AMPM, "");
}

原文由 tristan202 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

不应该是

if (!DateFormat.is24HourFormat(this))

您只想在未设置为 24 小时格式时分配 am/pm，对吗？

这是一个更紧凑的版本：

 if (!DateFormat.is24HourFormat(this)) {
    mHour = mCalendar.get(Calendar.HOUR_OF_DAY);
    int hourOfDay = mHour;
    if (hourOfDay >= 12) {
        views.setTextViewText(R.id.AMPM, "pm");
    } else {
        views.setTextViewText(R.id.AMPM, "am");
    }
} else {
    views.setTextViewText(R.id.AMPM, "");
}

原文由 Eliseo 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

更好的解决方案和整个代码示例：

 Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());

// below, the "hour" and "min" are variables,to which you want to set
//calendar.For example you can take this values from time picker
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, min);

is24HourFormat = android.text.format.DateFormat.is24HourFormat(context);

if (is24HourFormat) {
    // if system uses 24hourformat dateFormat will format the calender time according to 24hourformat. "HH" means 24hourformat
    CharSequence setTime = dateFormat.format("HH:mm", calendar);

} else {
    // if system doesnt use 24hourformat dateFormat will format the calender time according to 12hourformat. "hh" means 12hourformat and "a" will show am/pm marker
    CharSequence setTime = dateFormat.format("hh:mm a", calendar);
}

原文由 Eren 发布，翻译遵循 CC BY-SA 4.0 许可协议