ThreeTen-Backport error on Android - ZoneRulesException: No time-zone data files registered

Question

I\'m using ThreeTen-Backport library for my Android project (because java.time is not yet implemented in android development).

When I write LocalDate today=L

Answer 1

Instead of initialization of the library, you can try this:

LocalDateEx.kt

object LocalDateEx {
    /**an alternative of LocalDate.now(), as it requires initialization using AndroidThreeTen.init(context), which takes a bit time (loads a file)*/
    @JvmStatic
    fun getNow(): LocalDate = Calendar.getInstance().toLocalDate()
}

fun Calendar.toLocalDate(): LocalDate = LocalDate.of(get(Calendar.YEAR), get(Calendar.MONTH) + 1, get(Calendar.DAY_OF_MONTH))

LocalTimeEx.kt

object LocalTimeEx {
    /**an alternative of LocalDateTime.now(), as it requires initialization using AndroidThreeTen.init(context), which takes a bit time (loads a file)*/
    @JvmStatic
    fun getNow(): LocalTime = Calendar.getInstance().toLocalTime()
}

fun Calendar.toLocalTime(): LocalTime = LocalTime.of(get(Calendar.HOUR_OF_DAY), get(Calendar.MINUTE), get(Calendar.SECOND), get(Calendar.MILLISECOND) * 1000000)

LocalDateTimeEx.kt

object LocalDateTimeEx {
    /**an alternative of LocalDateTime.now(), as it requires initialization using AndroidThreeTen.init(context), which takes a bit time (loads a file)*/
    @JvmStatic
    fun getNow(): LocalDateTime = Calendar.getInstance().toLocalDateTime()
}

private fun Calendar.toLocalDateTime(): LocalDateTime = LocalDateTime.of(get(Calendar.YEAR), get(Calendar.MONTH) + 1, get(Calendar.DAY_OF_MONTH), get(Calendar.HOUR_OF_DAY), get(Calendar.MINUTE), get(Calendar.SECOND),
        get(Calendar.MILLISECOND) * 1000000)

Usage:

   val today=LocalDateEx.getNow()
   val today2=LocalTimeEx.getNow()
   val today3=LocalDateTimeEx.getNow()