sorting of arraylist in kotlin for recyclerview-CodePudding

I am giving app name, icon, package name, hour, mint, sec to an array my major problem is I want to sort this array according to most used app

    appInfoList.add(AppInfo(appName, appIcon, packageName, hour, mint, sec))

    appInfoList.sortBy { it.mint }

it didn't sort an array

CodePudding user response：

Is your appInfoList a MutableList? It needs to be a mutable list to sort the array. See this guide here on using Kotlin's sortBy function.

You can cast your list to a mutable list before sorting, like this:

val mutableAppInfoList = appInfoList.toMutableList()
mutableAppInfoList.sortBy { it.mint }

The mutableAppInfoList variable should contain the sorted list after calling sortBy.

CodePudding user response：

Modify your code this way

appInfoList
        .sortByDescending { it.hour * 3600   it.min * 60   it.sec }

The first element in the list will be the most used one.