홈 화면 갤러리 목록에 페이징을 적용한다 #67
There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package com.example.metasearch.core.data.impl.datasource | ||
|
|
||
| import android.content.ContentResolver | ||
| import android.content.ContentUris | ||
| import android.content.Context | ||
| import android.provider.MediaStore | ||
| import androidx.paging.PagingSource | ||
| import androidx.paging.PagingState | ||
| import com.example.metasearch.core.model.GalleryImageModel | ||
| import kotlinx.coroutines.CoroutineDispatcher | ||
| import kotlinx.coroutines.withContext | ||
|
|
||
| class GalleryPagingSource( | ||
| private val context: Context, | ||
| private val ioDispatcher: CoroutineDispatcher, | ||
| ) : PagingSource<Int, GalleryImageModel>() { | ||
|
|
||
| override suspend fun load(params: LoadParams<Int>): LoadResult<Int, GalleryImageModel> { | ||
| return withContext(ioDispatcher) { | ||
| try { | ||
| val offset = params.key ?: 0 | ||
| val limit = params.loadSize | ||
| val imageList = mutableListOf<GalleryImageModel>() | ||
|
|
||
| val projection = arrayOf( | ||
| MediaStore.Images.Media._ID, | ||
| MediaStore.Images.Media.DATE_ADDED, | ||
| ) | ||
|
|
||
| val queryArgs = android.os.Bundle().apply { | ||
| putInt(ContentResolver.QUERY_ARG_LIMIT, limit) | ||
| putInt(ContentResolver.QUERY_ARG_OFFSET, offset) | ||
| putStringArray(ContentResolver.QUERY_ARG_SORT_COLUMNS, arrayOf(MediaStore.Images.Media.DATE_ADDED)) | ||
| putInt(ContentResolver.QUERY_ARG_SORT_DIRECTION, ContentResolver.QUERY_SORT_DIRECTION_DESCENDING) | ||
| } | ||
|
|
||
| context.contentResolver.query( | ||
| MediaStore.Images.Media.EXTERNAL_CONTENT_URI, | ||
| projection, | ||
| queryArgs, | ||
| null, | ||
| )?.use { cursor -> | ||
| val idColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID) | ||
| val dateColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_ADDED) | ||
|
|
||
| while (cursor.moveToNext()) { | ||
| val id = cursor.getLong(idColumn) | ||
| val date = cursor.getLong(dateColumn) | ||
| val uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id) | ||
| imageList.add(GalleryImageModel(id = id, uriString = uri.toString(), dateAdded = date)) | ||
| } | ||
| } | ||
|
|
||
| LoadResult.Page( | ||
| data = imageList, | ||
| prevKey = if (offset == 0) null else offset - limit, | ||
| nextKey = if (imageList.size < limit) null else offset + imageList.size, | ||
| ) | ||
| } catch (e: Exception) { | ||
| LoadResult.Error(e) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override fun getRefreshKey(state: PagingState<Int, GalleryImageModel>): Int? { | ||
| return state.anchorPosition?.let { anchorPosition -> | ||
| state.closestPageToPosition(anchorPosition)?.prevKey?.plus(state.config.pageSize) | ||
| ?: state.closestPageToPosition(anchorPosition)?.nextKey?.minus(state.config.pageSize) | ||
| } | ||
| } | ||
| } | ||
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package com.example.metasearch.core.model | ||
|
|
||
| import androidx.compose.runtime.Stable | ||
|
|
||
| @Stable | ||
| data class GalleryImageModel( | ||
| val id: Long, // MediaStore._ID | ||
| val uriString: String, | ||
| val dateAdded: Long, | ||
| ) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Potential negative prevKey value.
When
offset < limit(e.g., on initial load withinitialLoadSize=60butpageSize=30),prevKey = offset - limitwould produce a negative value. This should be clamped to avoid invalid page keys.🐛 Proposed fix
LoadResult.Page( data = imageList, - prevKey = if (offset == 0) null else offset - limit, + prevKey = if (offset == 0) null else (offset - limit).coerceAtLeast(0).takeIf { it < offset }, nextKey = if (imageList.size < limit) null else offset + imageList.size, )Alternatively, a simpler approach:
📝 Committable suggestion
🤖 Prompt for AI Agents