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+--- Forum: Kotlin (https://zeroday.vip/Forum-Kotlin)
+--- Thread: Sort list with string date [Kotlin] (/Thread-Sort-list-with-string-date-Kotlin)
Sort list with string date [Kotlin] - craniologist299770 - 07-20-2023
I have arraylist **`typeBeanArrayList`** where element is some like a date: for example:
[30-03-2012, 28-03-2013, 31-03-2012, 2-04-2012, ...]
How can I sort in **descending order.**
Code:
typeBeanArrayList = database.getSingleCustomerDetail(c_id!!) //get data from SQlite database
creditListAdapter = CreditListAdapter(typeBeanArrayList)
rv_credit_list!!.adapter = creditListAdapter //Bind data in adapter
Thanks in advance...
RE: Sort list with string date [Kotlin] - bettejnyfcdpo - 07-20-2023
Use
[30-03-2012, 28-03-2013, 31-03-2012, 2-04-2012, ...].sortDescending()
if you want to sort by param use in this case length
[30-03-2012, 28-03-2013, 31-03-2012, 2-04-2012, ...].sortByDescending { it.length }
RE: Sort list with string date [Kotlin] - lionism595750 - 07-20-2023
Thank you @svkaka for information.
I just notice one line from @svkaka answer : **`.sortByDescending { it.length }`**.
and i changes in my code like :
typeBeanArrayList.sortByDescending{it.date}
Sorting is perfectly work.
RE: Sort list with string date [Kotlin] - refluxing454967 - 07-20-2023
If you have a list of `String`s representing dates, one way to sort them in descending order is:
val dates = listOf("30-03-2012", "28-03-2013", "31-03-2012", "2-04-2012")
val dateTimeFormatter: DateTimeFormatter = DateTimeFormatter.ofPattern("dd-MM-yyyy")
val result = dates.sortedByDescending {
LocalDate.parse(it, dateTimeFormatter)
}
println(result)
This will print:
[28-03-2013, 2-04-2012, 31-03-2012, 30-03-2012]
Note that `sortedByXXX` methods return a new List, i.e., they don't sort *in place*
RE: Sort list with string date [Kotlin] - ronahljwttfumm - 07-20-2023
You can use something like this if you are using a custom model
typeBeanArrayList.sortedWith(compareByDescending<YourModel> { it.date() })
RE: Sort list with string date [Kotlin] - vanettavang997 - 07-20-2023
data class YouModel(val startDate: String? = null) {
val BY_DATE_ORDER =
compareByDescending<YourModel> {
val format = SimpleDateFormat("yyyy-MM-dd")
var convertedDate = Date()
try {
convertedDate = it.startDate?.let { it1 -> format.parse(it1) } as Date
} catch (e: ParseException) {
e.printStackTrace()
}
convertedDate
}
}
yourList<YourModel>?.sortedWith(YourModel.BY_DATE_ORDER)
This works for me. I created a descending comparator using the function to transform value to a Comparable instance for comparison. I converted the string date to date before applying the sorting function.