How to sort array to weekdays format android

I have below json :

[
  {
    "id" : "12",
    "weekday": "Friday"
  },
  {
    "id" : "121",
    "weekday": "Monday"
  },
  {
    "id" : "123",
    "weekday": "Sunday"
  },
  {
    "id" : "222",
    "weekday": "Tuesday"
  }
]

Now i want to re-arrange it in a manner(Mon-Sun) where monday comes first and sunday comes last.

How can i do that ?

This is in Kotlin, but gives you an idea of what you can do. You can create a method or property that assigns a value to each JSON model based on the weekday and then sort based on that. This is case sensitive, you could make it case insensitive as well.

data class Weekday(

	@field:SerializedName("weekday")
	val weekday: String,

	@field:SerializedName("id")
	val id: String
)

private val Weekday.index: Int
	get() = when (weekday) {
		"Monday" -> 0
		"Tuesday" -> 1
		"Wednesday" -> 2
		"Thursday" -> 3
		"Friday" -> 4
		"Saturday" -> 5
		"Sunday" -> 6
		else -> 7
	}

fun sort() {
	val weekdays: List<Weekday> = /* TODO */

	val result = weekdays.sortedWith(object : Comparator<Weekday> {
		override fun compare(o1: Weekday, o2: Weekday): Int {
			return o1.index.compareTo(o2.index)
		}

	})
}

Give numbers 0-6 to weekdays. Then sort them according to this numbers

There is a simple example here

https://stackoverflow.com/questions/43429998/how-to-sort-strings-containing-day-of-week-names-in-ascending-order

Try this

    public JSONArray sortWeekDays(JSONArray daysArray) {
JSONArray sortedWeekDays = new JSONArray();
HashMap<String, Integer> dayMap = new HashMap<>();
dayMap.put("Monday", 1);
dayMap.put("Tuesday", 2);
dayMap.put("Wednesday", 3);
dayMap.put("Thursday", 4);
dayMap.put("Friday", 5);
dayMap.put("Saturday", 6);
dayMap.put("Sunday", 7);
ArrayList<Days> weekdays = new ArrayList<>();
for (int i = 0; i < daysArray.length(); i++) {
JSONObject dayObject = daysArray.getJSONObject(i);
Days day = new Days(dayObject.getString("id"), dayObject.getString("weekday"));
weekdays.add(day);
}
Collections.sort(weekdays, new Comparator<Days>() {
@Override
public int compare(Days o1, Days o2) {
return dayMap.get(o1.getDay()).compareTo(dayMap.get(o2.getDay()));
}
});
for (Days days : weekdays) {
sortedWeekDays.put(days.getJsonObject());
}
return sortedWeekDays;
}
public class Days {
String id = "";
String day = "";
public Days(String id, String day) {
this.id = id;
this.day = day;
}
public String getDay() {
return day;
}
public JSONObject getJsonObject() {
super.toString();
JSONObject object = new JSONObject();
object.put("id", id);
object.put("weekday", day);
return object;
}
}

You didn't say what your resulting data format should be. But supposing you've already converted it to a List of something like this:

data class Day(val id: Int, val name: String)

if the JSON day of the week will always be in English, you can sort them like this:

val sortedList = list.sortedBy { DayOfWeek.valueOf(it.name.toUpperCase()).value }