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Fix paging source key #221

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Fix paging source key #221

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11 changes: 9 additions & 2 deletions app/src/main/java/com/example/android/codelabs/paging/data/GithubPagingSource.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -33,11 +33,18 @@ class GithubPagingSource(
private val query: String
) : PagingSource<Int, Repo>() {
override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Repo> {
val position = params.key ?: GITHUB_STARTING_PAGE_INDEX
val position = params.key?.let {
it * NETWORK_PAGE_SIZE / params.loadSize
} ?: GITHUB_STARTING_PAGE_INDEX
val apiQuery = query + IN_QUALIFIER
return try {
val response = service.searchRepos(apiQuery, position, params.loadSize)
val repos = response.items
val prevKey = if (position == GITHUB_STARTING_PAGE_INDEX) {
null
} else {
(position * params.loadSize / NETWORK_PAGE_SIZE) - 1
}
val nextKey = if (repos.isEmpty()) {
null
} else {
Expand All @@ -47,7 +54,7 @@ class GithubPagingSource(
}
LoadResult.Page(
data = repos,
prevKey = if (position == GITHUB_STARTING_PAGE_INDEX) null else position - 1,
prevKey = prevKey,
nextKey = nextKey
)
} catch (exception: IOException) {
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