添加业务逻辑

2024-07-29 00:01:09 +08:00
parent cdc0f6e38d
commit d23c5f5c7e
19 changed files with 764 additions and 321 deletions
--- a/app/src/main/java/com/aiosman/riderpro/data/MomentService.kt
+++ b/app/src/main/java/com/aiosman/riderpro/data/MomentService.kt
@@ -0,0 +1,98 @@
+package com.aiosman.riderpro.data
+
+import androidx.paging.PagingSource
+import androidx.paging.PagingState
+import com.aiosman.riderpro.R
+import com.aiosman.riderpro.model.MomentItem
+import com.aiosman.riderpro.test.TestDatabase
+import java.io.IOException
+
+class MomentPagingSource(
+    private val remoteDataSource: MomentRemoteDataSource,
+) : PagingSource<Int, MomentItem>() {
+    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, MomentItem> {
+        return try {
+            val currentPage = params.key ?: 1
+            val moments = remoteDataSource.getMoments(
+                pageNumber = currentPage
+            )
+
+            LoadResult.Page(
+                data = moments.list,
+                prevKey = if (currentPage == 1) null else currentPage - 1,
+                nextKey = if (moments.list.isEmpty()) null else moments.page + 1
+            )
+        } catch (exception: IOException) {
+            return LoadResult.Error(exception)
+        }
+    }
+
+    override fun getRefreshKey(state: PagingState<Int, MomentItem>): Int? {
+        return state.anchorPosition
+    }
+
+}
+
+class MomentRemoteDataSource(
+    private val momentService: MomentService,
+) {
+    suspend fun getMoments(pageNumber: Int): ListContainer<MomentItem> {
+        return momentService.getMoments(pageNumber)
+    }
+}
+
+interface MomentService {
+    suspend fun getMoments(pageNumber: Int): ListContainer<MomentItem>
+    suspend fun getMomentById(id: Int): MomentItem
+    suspend fun likeMoment(id: Int)
+}
+
+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"
+    )
+    var mockData = TestDatabase.momentData
+    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]
+    }
+
+    override suspend fun likeMoment(id: Int) {
+//        mockData = mockData.map {
+//            if (it.id == id) {
+//                it.copy(likeCount = it.likeCount + 1)
+//            } else {
+//                it
+//            }
+//        }
+//        mockData
+    }
+
+}
+
+class TestMomentBackend(
+    private val mockData: List<MomentItem>,
+    private val loadDelay: Long = 500,
+) {
+    val DataBatchSize = 5
+    suspend fun fetchMomentItems(pageNumber: Int): ListContainer<MomentItem> {
+        val from = pageNumber * DataBatchSize
+        val to = (pageNumber + 1) * DataBatchSize
+        val currentSublist = mockData.subList(from, to)
+        // delay
+        kotlinx.coroutines.delay(loadDelay)
+        return ListContainer(
+            total = mockData.size,
+            page = pageNumber,
+            pageSize = DataBatchSize,
+            list = currentSublist
+        )
+    }
+
+}