Podeseno stranicenje tako da ucitava nove strane samo kada korisnik skroluje #48

3 files changed, 14 insertions, 14 deletions

diff --git a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/Adapters/ShowPostsAdapter.kt b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/Adapters/ShowPostsAdapter.kt
index 0bd625f..216f859 100644
--- a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/Adapters/ShowPostsAdapter.kt
+++ b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/Adapters/ShowPostsAdapter.kt
@@ -2,8 +2,6 @@ package com.example.brzodolokacije.Adapters
 
 import android.app.Activity
 import android.content.Intent
-import android.graphics.BitmapFactory
-import android.os.AsyncTask
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.ViewGroup
@@ -13,18 +11,11 @@ import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import com.bumptech.glide.Glide
 import com.example.brzodolokacije.Activities.ActivitySinglePost
-import com.example.brzodolokacije.Activities.NavigationActivity
 import com.example.brzodolokacije.Interfaces.IBackendApi
-import com.example.brzodolokacije.Models.LocationType
 import com.example.brzodolokacije.Models.PostPreview
 import com.example.brzodolokacije.Services.RetrofitHelper
 import com.example.brzodolokacije.Services.SharedPreferencesHelper
 import com.example.brzodolokacije.databinding.PostPreviewBinding
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.launch
-import okhttp3.ResponseBody
-import retrofit2.Call
-import retrofit2.Response
 
 
 class ShowPostsAdapter (val activity:Activity,val items : MutableList<PostPreview>?=null)
diff --git a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsPagingSource.kt b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsPagingSource.kt
index b1c89db..cee39ce 100644
--- a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsPagingSource.kt
+++ b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsPagingSource.kt
@@ -2,9 +2,10 @@ package com.example.brzodolokacije.paging
 
 import android.app.Activity
 import android.util.Log
+import androidx.paging.ExperimentalPagingApi
 import androidx.paging.PagingSource
+import androidx.paging.PagingState
 import com.example.brzodolokacije.Interfaces.IBackendApi
-import com.example.brzodolokacije.Models.PagedPosts
 import com.example.brzodolokacije.Models.PostPreview
 import com.example.brzodolokacije.Models.SearchParams
 import com.example.brzodolokacije.Services.SharedPreferencesHelper
@@ -23,10 +24,10 @@ class SearchPostsPagingSource(
             val response=backend.getPagedPosts("Bearer "+token,searchParams.locationId,
                 page,searchParams.sorttype,searchParams.filterdate
             )
-            Log.d("main",page.toString())
+            Log.d("main","stranicenje: "+page.toString())
             LoadResult.Page(
                 response.posts,prevKey=if(page==0) null else page-1,
-                nextKey=if(response.posts.isEmpty()) null else page+1
+                nextKey=if(page==response.totalpages) null else page+1
             )
         }catch(exception:IOException){
             return LoadResult.Error(exception)
@@ -35,4 +36,12 @@ class SearchPostsPagingSource(
         }
     }
 
+    @ExperimentalPagingApi
+    override fun getRefreshKey(state: PagingState<Int, PostPreview>): Int? {
+        return state.anchorPosition?.let{ anchorPosition->
+            val anchorPage=state.closestPageToPosition(anchorPosition)
+            anchorPage?.prevKey?.plus(1)?:anchorPage?.nextKey?.minus(1)
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsRepository.kt b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsRepository.kt
index 4eeb85b..f43bc31 100644
--- a/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsRepository.kt
+++ b/Client/BrzoDoLokacije/app/src/main/java/com/example/brzodolokacije/paging/SearchPostsRepository.kt
@@ -4,7 +4,6 @@ import android.app.Activity
 import androidx.paging.Pager
 import androidx.paging.PagingConfig
 import androidx.paging.PagingData
-import androidx.paging.cachedIn
 import com.example.brzodolokacije.Models.PostPreview
 import com.example.brzodolokacije.Models.SearchParams
 import com.example.brzodolokacije.Services.RetrofitHelper
@@ -14,6 +13,7 @@ class SearchPostsRepository(val activity: Activity,val searchParams: SearchParam
     companion object{
         const val DEFAULT_PAGE_SIZE=20
         const val DEFAULT_PAGE_INDEX=1
+        const val PREFETCH_DISTANCE=6
 
         fun getInstance(activity: Activity,searchParams: SearchParams)=SearchPostsRepository(activity,searchParams)
     }
@@ -26,6 +26,6 @@ class SearchPostsRepository(val activity: Activity,val searchParams: SearchParam
     }
 
     private fun getDefaultPageConfig(): PagingConfig {
-        return PagingConfig(pageSize= DEFAULT_PAGE_SIZE, enablePlaceholders = false)
+        return PagingConfig(pageSize= DEFAULT_PAGE_SIZE, prefetchDistance = PREFETCH_DISTANCE, enablePlaceholders = false)
     }
 }
\ No newline at end of file