* Take the Long milliseconds returned by the system and stored in Room, * and convert it to a nicely formatted string for display. * * EEEE - Display the long letter version of the weekday * MMM - Display the letter abbreviation of the nmotny * dd-yyyy - day in month and full year numerically * HH:mm - Hours and minutes in 24hr format

Util.kt

/**
 * Take the Long milliseconds returned by the system and stored in Room,
 * and convert it to a nicely formatted string for display.
 *
 * EEEE - Display the long letter version of the weekday
 * MMM - Display the letter abbreviation of the nmotny
 * dd-yyyy - day in month and full year numerically
 * HH:mm - Hours and minutes in 24hr format
 */
@SuppressLint("SimpleDateFormat")
fun convertLongToDateString(systemTime: Long): String {
    return SimpleDateFormat("EEEE MMM-dd-yyyy' Time: 'HH:mm")
            .format(systemTime).toString()
}

/**
 * Takes a list of SleepNights and converts and formats it into one string for display.
 *
 * For display in a TextView, we have to supply one string, and styles are per TextView, not
 * applicable per word. So, we build a formatted string using HTML. This is handy, but we will
 * learn a better way of displaying this data in a future lesson.
 *
 * @param   nights - List of all SleepNights in the database.
 * @param   resources - Resources object for all the resources defined for our app.
 *
 * @return  Spanned - An interface for text that has formatting attached to it.
 *           See: https://developer.android.com/reference/android/text/Spanned
 */


fun formatNights(nights: List<SleepNight>, resources: Resources): Spanned {
    val sb = StringBuilder()
    sb.apply {
        append(resources.getString(R.string.title))
        nights.forEach {
            append("<br>")
            append(resources.getString(R.string.start_time))
            append("\t${convertLongToDateString(it.startTimeMilli)}<br>")
            if (it.endTimeMilli != it.startTimeMilli) {
                append(resources.getString(R.string.end_time))
                append("\t${convertLongToDateString(it.endTimeMilli)}<br>")
                append(resources.getString(R.string.quality))
                append("\t${convertNumericQualityToString(it.sleepQuality, resources)}<br>")
                append(resources.getString(R.string.hours_slept))

                // Hours
                append("\t ${it.endTimeMilli.minus(it.startTimeMilli) / 1000 / 60 / 60}:")

                // Minutes
                append("${it.endTimeMilli.minus(it.startTimeMilli) / 1000 / 60}:")

                // Seconds
                append("${it.endTimeMilli.minus(it.startTimeMilli) / 1000}<br><br>")
            }
        }
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return Html.fromHtml(sb.toString(), Html.FROM_HTML_MODE_LEGACY)
    } else {
        return HtmlCompat.fromHtml(sb.toString(), HtmlCompat.FROM_HTML_MODE_LEGACY)
    }
}