添加业务逻辑

app/src/main/java/com/aiosman/riderpro/data/comment/CommentPagingSource.kt

@@ -0,0 +1,98 @@
+package com.aiosman.riderpro.data.comment
+
+import androidx.paging.PagingSource
+import androidx.paging.PagingState
+import com.aiosman.riderpro.data.ListContainer
+import java.io.IOException
+import kotlin.random.Random
+
+data class Comment(
+    val name: String,
+    val comment: String,
+    val date: String,
+    val likes: Int,
+    val replies: List<Comment>
+)
+
+class CommentPagingSource(
+    private val remoteDataSource: CommentRemoteDataSource,
+) : PagingSource<Int, Comment>() {
+
+    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Comment> {
+        return try {
+            val currentPage = params.key ?: 1
+            val comments = remoteDataSource.getComments(
+                pageNumber = currentPage
+            )
+
+            LoadResult.Page(
+                data = comments.list,
+                prevKey = if (currentPage == 1) null else currentPage - 1,
+                nextKey = if (comments.list.isEmpty()) null else comments.page + 1
+            )
+        } catch (exception: IOException) {
+            return LoadResult.Error(exception)
+        }
+    }
+
+    override fun getRefreshKey(state: PagingState<Int, Comment>): Int? {
+        return state.anchorPosition
+    }
+
+}
+
+class CommentRemoteDataSource(
+    private val commentService: CommentService,
+) {
+    suspend fun getComments(pageNumber: Int): ListContainer<Comment> {
+        return commentService.getComments(pageNumber)
+    }
+}
+
+interface CommentService {
+    suspend fun getComments(pageNumber: Int): ListContainer<Comment>
+}
+
+class TestCommentServiceImpl : CommentService {
+    private val mockData = generateMockComments(100)
+    override suspend fun getComments(pageNumber: Int): ListContainer<Comment> {
+        val from = pageNumber * DataBatchSize
+        val to = (pageNumber + 1) * DataBatchSize
+        val currentSublist = mockData.subList(from, to)
+        return ListContainer(
+            total = mockData.size,
+            page = pageNumber,
+            pageSize = DataBatchSize,
+            list = currentSublist
+        )
+    }
+
+    private fun generateMockComments(count: Int): List<Comment> {
+        return (0 until count).map {
+            Comment(
+                name = "User $it",
+                comment = "This is comment $it",
+                date = "2023-02-02 11:23",
+                likes = Random.nextInt(0, 100),
+                replies = generateMockReplies()
+            )
+        }
+    }
+
+    private fun generateMockReplies(): List<Comment> {
+        val replyCount = Random.nextInt(0, 6)
+        return (0 until replyCount).map {
+            Comment(
+                name = "Reply User $it",
+                comment = "This is reply $it",
+                date = "2023-02-02 11:23",
+                likes = Random.nextInt(0, 100),
+                replies = emptyList()
+            )
+        }
+    }
+
+    companion object {
+        const val DataBatchSize = 5
+    }
+}

app/src/main/java/com/aiosman/riderpro/data/moment/MomentPagingSource.kt

@@ -1,12 +1,12 @@
 package com.aiosman.riderpro.data.moment
 
-import android.net.http.HttpException
 import androidx.paging.PagingSource
 import androidx.paging.PagingState
 import com.aiosman.riderpro.R
 import com.aiosman.riderpro.data.ListContainer
 import com.aiosman.riderpro.model.MomentItem
 import java.io.IOException
+import kotlin.random.Random
 
 class MomentPagingSource(
     private val remoteDataSource: MomentRemoteDataSource,
@@ -45,9 +45,15 @@ class MomentRemoteDataSource(
 
 interface MomentService {
     suspend fun getMoments(pageNumber: Int): ListContainer<MomentItem>
+    suspend fun getMomentById(id: Int): MomentItem
 }
 
 class TestMomentServiceImpl() : MomentService {
+    var imageList = listOf(
+        "https://img.freepik.com/free-photo/white-billboard-template_23-2147726635.jpg?t=st=1722150015~exp=1722153615~hmac=5540620196d7898215d822be26353c87a63d51bbfb2b814e032626e1948a1583&w=740",
+        "https://img.freepik.com/free-photo/minimal-clothing-label-fashion-brands_53876-111053.jpg?w=1060&t=st=1722150122~exp=1722150722~hmac=67f8a2b6abfe3d08714cf0cc0085485c3221e1ba00dda14378b03753dce39153",
+        "https://img.freepik.com/free-photo/marketing-strategy-planning-strategy-concept_53876-42950.jpg"
+    )
     val mockData = (0..300).toList().mapIndexed { idx, _ ->
         MomentItem(
             id = idx,
@@ -61,13 +67,18 @@ class TestMomentServiceImpl() : MomentService {
             likeCount = 21,
             commentCount = 43,
             shareCount = 33,
-            favoriteCount = 211
+            favoriteCount = 211,
+            images = imageList.shuffled().take(3),
         )
     }
     val testMomentBackend = TestMomentBackend(mockData)
     override suspend fun getMoments(pageNumber: Int): ListContainer<MomentItem> {
         return testMomentBackend.fetchMomentItems(pageNumber)
     }
+
+    override suspend fun getMomentById(id: Int): MomentItem {
+        return mockData[id]
+    }
 }
 
 class TestMomentBackend(