Pagination basics in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the initial page number to 1.

Android Kotlin

var currentPage = [1]

Drag options to blanks, or click blank then click option'

A1

B0

Cnull

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting page number at 0 instead of 1.

Using null or negative numbers for page.

The first page number in pagination usually starts at 1 to represent the first set of data.

2fill in blank

medium

Complete the code to increase the page number by 1 when loading the next page.

Android Kotlin

currentPage [1] 1

Drag options to blanks, or click blank then click option'

A+=

B/=

C*=

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-=' which decreases the page number.

Using multiplication or division operators.

To move to the next page, you add 1 to the current page number.

3fill in blank

hard

Fix the error in the code to correctly check if the current page is the last page.

Android Kotlin

if (currentPage [1] totalPages) {
    // No more pages to load
}

Drag options to blanks, or click blank then click option'

A<

B==

C!=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '>' which check for less or greater, not equality.

Using '!=' which checks for inequality.

To check if the current page is the last page, compare if currentPage equals totalPages.

4fill in blank

hard

Fill both blanks to create a function that returns true if there are more pages to load.

Android Kotlin

fun hasMorePages(currentPage: Int, totalPages: Int): Boolean {
    return currentPage [1] totalPages
}

Drag options to blanks, or click blank then click option'

A>

B==

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' which would be true after last page.

Using '==' which only checks equality.

The function should return true if the current page is less than total pages, meaning more pages exist.

5fill in blank

hard

Fill all three blanks to create a map of page numbers to their data lists, filtering only pages with data.

Android Kotlin

val pagesData = mapOf(
    [1] to listOf("Item1", "Item2"),
    [2] to listOf(),
    [3] to listOf("Item3")
).filter { it.value.isNotEmpty() }

Drag options to blanks, or click blank then click option'

A1

B2

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-consecutive or invalid page numbers.

Using page numbers not matching the data.

The map keys are page numbers 1, 2, and 3. The filter removes pages with empty lists, so page 2 is excluded.