CODEWITHSUNDEEP
androidkotlinandroid-paging-library
Lyra
Lyra

Reputation: 61

How can I get total pages from per page item count and total item count API response?

I'm fetching data froma remove endpoint. Data response only contains total item count but no total page. How can I calculate total pages given that I only have total item count and per page item count? I need this because I'm trying to setup paging library

for example:

perPage = 10
totalItemCount = 10
totalPages = 1

The idea is totalItemCount is greater than 10 + 1 but lower than or equal 20, totalPages would be 2; And totalItemCount > 10 + 10 + 1 but lower than or equal 30, totalPages = 3 and so on...

I couldn't make a good algo to calculate this using Kotlin

Upvotes: 0

Views: 1748

Answers (1)

rturrado
rturrado

Reputation: 8064

This seems to work. I have tried it in https://pl.kotl.in/hUDoamkG3:

fun main()
{
    val listOfTotalItemCounts = listOf(0, 1, 9, 10, 15, 19, 20, 21, 124)
    val perPage = 10
    
    for (totalItemCount in listOfTotalItemCounts)
    {
        var result = (totalItemCount / perPage)
        result = if (totalItemCount % perPage == 0) result else (result + 1)
        
        print("When totalItemCount = ")
        print(totalItemCount)
        print(" ---> result = ")
        println(result)
    }
}

It yields the following output:

When totalItemCount = 0 ---> result = 0
When totalItemCount = 1 ---> result = 1
When totalItemCount = 9 ---> result = 1
When totalItemCount = 10 ---> result = 1
When totalItemCount = 15 ---> result = 2
When totalItemCount = 19 ---> result = 2
When totalItemCount = 20 ---> result = 2
When totalItemCount = 21 ---> result = 3
When totalItemCount = 124 ---> result = 13

Upvotes: 2

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