My custom arraylist is not sorting properly in android Kotlin

Question

val sortedList = allNovelList.sortedWith(compareBy { (it as Novel).no }) And allNovelList.sortBy { (it as Novel).no }

I have a list of custom object, in which there are integer 'no' is added like id or primary key. From 0 to 9 sorting is working very fine but after 9 , 10 is below to 1.

I am working in Kotlin for Android for first time. I have looked all around the web but I could not get the proper code.

Both lines are giving same sorting. What I want, 1,2,3,....,9,10,11,12...., And What I get after sorting. 1,10,11,2,3,4,5,6...,9

It is sorting like alphabetically.

@forpas ,But I got your point what you want to say. let me check it. Thanks for your pointing out the reason. — Muhammad Rehan
– Muhammad Rehan, Commented Aug 31, 2019 at 17:55

Mehrbod Khiabani · Accepted Answer · 2019-08-31 18:02:21Z

3

As you mentioned in your comment, no is a String, so it sorts it with string sort rules in mind.

You should try this:

val sortedList = allNovelList.sortBy { (it as Novel).no.toInt() }

Make sure that no is an Integer.

answered Aug 31, 2019 at 18:02

Mehrbod Khiabani

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2 Comments

Giddy Naya Over a year ago

@Muhammad Rehan Accept and upvote an answer if it solves your problem

Muhammad Rehan Over a year ago

Yeah, I would love to do, But stackoverflow is not allowing me to upvote because my reputation is less than 15. So, That's why.

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