Update: Migrate to Paged FastAdapter

build.gradle

@@ -151,6 +151,7 @@ dependencies {
     implementation("com.mikepenz:fastadapter:5.6.0")
     implementation("com.mikepenz:fastadapter-extensions-diff:5.6.0")
     implementation("com.mikepenz:fastadapter-extensions-binding:5.6.0")
+    implementation("com.mikepenz:fastadapter-extensions-paged:5.6.0")
 
     // Coil
     implementation 'io.coil-kt:coil:1.4.0'

src/main/kotlin/com/looker/droidify/database/DAOs.kt

@@ -2,6 +2,7 @@ package com.looker.droidify.database
 
 import android.database.Cursor
 import android.os.CancellationSignal
+import androidx.paging.DataSource
 import androidx.room.*
 import androidx.sqlite.db.SimpleSQLiteQuery
 import androidx.sqlite.db.SupportSQLiteQuery
@@ -175,14 +176,13 @@ interface ProductDao : BaseDao<Product> {
     @RawQuery(observedEntities = [Product::class])
     fun queryList(
         query: SupportSQLiteQuery
-    ): List<Product>
+    ): DataSource.Factory<Int, Product>
 
     // TODO optimize and simplify
-    @Transaction
     fun queryList(
         installed: Boolean, updates: Boolean, searchQuery: String,
         section: ProductItem.Section, order: ProductItem.Order, numberOfItems: Int = 0
-    ): List<Product> {
+    ): DataSource.Factory<Int, Product> {
         val builder = QueryBuilder()
 
         val signatureMatches = """installed.${ROW_SIGNATURE} IS NOT NULL AND

src/main/kotlin/com/looker/droidify/ui/fragments/ExploreFragment.kt

@@ -11,9 +11,13 @@ import com.looker.droidify.database.Product
 import com.looker.droidify.databinding.FragmentExploreXBinding
 import com.looker.droidify.entity.Repository
 import com.looker.droidify.ui.adapters.AppListAdapter
+import com.looker.droidify.ui.items.VAppItem
 import com.looker.droidify.ui.viewmodels.MainNavFragmentViewModelX
+import com.looker.droidify.utility.PRODUCT_ASYNC_DIFFER_CONFIG
 import com.looker.droidify.utility.RxUtils
 import com.looker.droidify.utility.extension.resources.getDrawableCompat
+import com.mikepenz.fastadapter.FastAdapter
+import com.mikepenz.fastadapter.paged.PagedModelAdapter
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.schedulers.Schedulers
 import me.zhanghai.android.fastscroll.FastScrollerBuilder
@@ -23,6 +27,8 @@ class ExploreFragment : MainNavFragmentX() {
 
     override lateinit var viewModel: MainNavFragmentViewModelX
     private lateinit var binding: FragmentExploreXBinding
+    private lateinit var appsItemAdapter: PagedModelAdapter<Product, VAppItem>
+    private var appsFastAdapter: FastAdapter<VAppItem>? = null
 
     override val source = Source.AVAILABLE
 
@@ -40,13 +46,19 @@ class ExploreFragment : MainNavFragmentX() {
         viewModel = ViewModelProvider(this, viewModelFactory)
             .get(MainNavFragmentViewModelX::class.java)
 
+        appsItemAdapter = PagedModelAdapter<Product, VAppItem>(PRODUCT_ASYNC_DIFFER_CONFIG) {
+            it.data_item?.let { item ->
+                VAppItem(item, repositories[it.repository_id])
+            }
+        }
+
+        appsFastAdapter = FastAdapter.with(appsItemAdapter)
+        appsFastAdapter?.setHasStableIds(true)
         binding.recyclerView.apply {
-            layoutManager = LinearLayoutManager(context)
+            layoutManager = LinearLayoutManager(requireContext())
-            isMotionEventSplittingEnabled = false
-            isVerticalScrollBarEnabled = false
             setHasFixedSize(true)
             recycledViewPool.setMaxRecycledViews(AppListAdapter.ViewType.PRODUCT.ordinal, 30)
-            adapter = AppListAdapter { mainActivityX.navigateProduct(it.packageName) }
+            adapter = appsFastAdapter
             FastScrollerBuilder(this)
                 .useMd2Style()
                 .setThumbDrawable(this.context.getDrawableCompat(R.drawable.scrollbar_thumb))

src/main/kotlin/com/looker/droidify/ui/fragments/InstalledFragment.kt

@@ -8,16 +8,18 @@ import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.looker.droidify.R
+import com.looker.droidify.database.Product
 import com.looker.droidify.databinding.FragmentInstalledXBinding
-import com.looker.droidify.entity.ProductItem
 import com.looker.droidify.entity.Repository
+import com.looker.droidify.ui.adapters.AppListAdapter
 import com.looker.droidify.ui.items.HAppItem
 import com.looker.droidify.ui.items.VAppItem
 import com.looker.droidify.ui.viewmodels.MainNavFragmentViewModelX
+import com.looker.droidify.utility.PRODUCT_ASYNC_DIFFER_CONFIG
 import com.looker.droidify.utility.RxUtils
 import com.looker.droidify.utility.extension.resources.getDrawableCompat
 import com.mikepenz.fastadapter.FastAdapter
-import com.mikepenz.fastadapter.adapters.ItemAdapter
+import com.mikepenz.fastadapter.paged.PagedModelAdapter
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.schedulers.Schedulers
 import me.zhanghai.android.fastscroll.FastScrollerBuilder
@@ -27,9 +29,9 @@ class InstalledFragment : MainNavFragmentX() {
     override lateinit var viewModel: MainNavFragmentViewModelX
     private lateinit var binding: FragmentInstalledXBinding
 
-    private val installedItemAdapter = ItemAdapter<VAppItem>()
+    private lateinit var installedItemAdapter: PagedModelAdapter<Product, VAppItem>
     private var installedFastAdapter: FastAdapter<VAppItem>? = null
-    private val updatedItemAdapter = ItemAdapter<HAppItem>()
+    private lateinit var updatedItemAdapter: PagedModelAdapter<Product, HAppItem>
     private var updatedFastAdapter: FastAdapter<HAppItem>? = null
 
     override val source = Source.INSTALLED
@@ -48,12 +50,23 @@ class InstalledFragment : MainNavFragmentX() {
         viewModel = ViewModelProvider(this, viewModelFactory)
             .get(MainNavFragmentViewModelX::class.java)
 
+        installedItemAdapter = PagedModelAdapter<Product, VAppItem>(PRODUCT_ASYNC_DIFFER_CONFIG) {
+            it.data_item?.let { item ->
+                VAppItem(item, repositories[it.repository_id])
+            }
+        }
+        updatedItemAdapter = PagedModelAdapter<Product, HAppItem>(PRODUCT_ASYNC_DIFFER_CONFIG) {
+            it.data_item?.let { item ->
+                // TODO filter for only updated apps and add placeholder
+                HAppItem(item, repositories[it.repository_id])
+            }
+        }
+
         installedFastAdapter = FastAdapter.with(installedItemAdapter)
         installedFastAdapter?.setHasStableIds(true)
         binding.installedRecycler.apply {
             layoutManager = LinearLayoutManager(requireContext())
-            isMotionEventSplittingEnabled = false
+            recycledViewPool.setMaxRecycledViews(AppListAdapter.ViewType.PRODUCT.ordinal, 30)
-            isVerticalScrollBarEnabled = false
             adapter = installedFastAdapter
             FastScrollerBuilder(this)
                 .useMd2Style()
@@ -64,13 +77,8 @@ class InstalledFragment : MainNavFragmentX() {
         updatedFastAdapter?.setHasStableIds(true)
         binding.updatedRecycler.apply {
             layoutManager = LinearLayoutManager(requireContext(), RecyclerView.HORIZONTAL, false)
-            isMotionEventSplittingEnabled = false
+            recycledViewPool.setMaxRecycledViews(AppListAdapter.ViewType.PRODUCT.ordinal, 30)
-            isVerticalScrollBarEnabled = false
             adapter = updatedFastAdapter
-            FastScrollerBuilder(this)
-                .useMd2Style()
-                .setThumbDrawable(this.context.getDrawableCompat(R.drawable.scrollbar_thumb))
-                .build()
         }
         return binding.root
     }

src/main/kotlin/com/looker/droidify/ui/fragments/LatestFragment.kt

@@ -8,16 +8,18 @@ import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.looker.droidify.R
+import com.looker.droidify.database.Product
 import com.looker.droidify.databinding.FragmentLatestXBinding
-import com.looker.droidify.entity.ProductItem
 import com.looker.droidify.entity.Repository
+import com.looker.droidify.ui.adapters.AppListAdapter
 import com.looker.droidify.ui.items.HAppItem
 import com.looker.droidify.ui.items.VAppItem
 import com.looker.droidify.ui.viewmodels.MainNavFragmentViewModelX
+import com.looker.droidify.utility.PRODUCT_ASYNC_DIFFER_CONFIG
 import com.looker.droidify.utility.RxUtils
 import com.looker.droidify.utility.extension.resources.getDrawableCompat
 import com.mikepenz.fastadapter.FastAdapter
-import com.mikepenz.fastadapter.adapters.ItemAdapter
+import com.mikepenz.fastadapter.paged.PagedModelAdapter
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.schedulers.Schedulers
 import me.zhanghai.android.fastscroll.FastScrollerBuilder
@@ -27,11 +29,12 @@ class LatestFragment : MainNavFragmentX() {
     override lateinit var viewModel: MainNavFragmentViewModelX
     private lateinit var binding: FragmentLatestXBinding
 
-    private val updatedItemAdapter = ItemAdapter<VAppItem>()
+    private lateinit var updatedItemAdapter: PagedModelAdapter<Product, VAppItem>
     private var updatedFastAdapter: FastAdapter<VAppItem>? = null
-    private val newItemAdapter = ItemAdapter<HAppItem>()
+    private lateinit var newItemAdapter: PagedModelAdapter<Product, HAppItem>
     private var newFastAdapter: FastAdapter<HAppItem>? = null
 
+    // TODO replace the source with one that get a certain amount of updated apps
     override val source = Source.AVAILABLE
 
     private var repositories: Map<Long, Repository> = mapOf()
@@ -48,12 +51,23 @@ class LatestFragment : MainNavFragmentX() {
         viewModel = ViewModelProvider(this, viewModelFactory)
             .get(MainNavFragmentViewModelX::class.java)
 
+        updatedItemAdapter = PagedModelAdapter<Product, VAppItem>(PRODUCT_ASYNC_DIFFER_CONFIG) {
+            it.data_item?.let { item ->
+                VAppItem(item, repositories[it.repository_id])
+            }
+        }
+        newItemAdapter = PagedModelAdapter<Product, HAppItem>(PRODUCT_ASYNC_DIFFER_CONFIG) {
+            it.data_item?.let { item ->
+                // TODO filter for only new apps and add placeholder
+                HAppItem(item, repositories[it.repository_id])
+            }
+        }
+
         updatedFastAdapter = FastAdapter.with(updatedItemAdapter)
         updatedFastAdapter?.setHasStableIds(true)
         binding.updatedRecycler.apply {
             layoutManager = LinearLayoutManager(requireContext())
-            isMotionEventSplittingEnabled = false
+            recycledViewPool.setMaxRecycledViews(AppListAdapter.ViewType.PRODUCT.ordinal, 30)
-            isVerticalScrollBarEnabled = false
             adapter = updatedFastAdapter
             FastScrollerBuilder(this)
                 .useMd2Style()
@@ -64,13 +78,8 @@ class LatestFragment : MainNavFragmentX() {
         newFastAdapter?.setHasStableIds(true)
         binding.newRecycler.apply {
             layoutManager = LinearLayoutManager(requireContext(), RecyclerView.HORIZONTAL, false)
-            isMotionEventSplittingEnabled = false
+            recycledViewPool.setMaxRecycledViews(AppListAdapter.ViewType.PRODUCT.ordinal, 30)
-            isVerticalScrollBarEnabled = false
             adapter = newFastAdapter
-            FastScrollerBuilder(this)
-                .useMd2Style()
-                .setThumbDrawable(this.context.getDrawableCompat(R.drawable.scrollbar_thumb))
-                .build()
         }
         return binding.root
     }

src/main/kotlin/com/looker/droidify/ui/viewmodels/MainNavFragmentViewModelX.kt

@@ -1,14 +1,18 @@
 package com.looker.droidify.ui.viewmodels
 
-import androidx.lifecycle.MediatorLiveData
+import androidx.lifecycle.LiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
+import androidx.paging.DataSource
+import androidx.paging.LivePagedListBuilder
+import androidx.paging.PagedList
 import com.looker.droidify.database.DatabaseX
 import com.looker.droidify.database.Product
 import com.looker.droidify.entity.ProductItem
 import com.looker.droidify.ui.fragments.Request
 import com.looker.droidify.ui.fragments.Source
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
@@ -68,15 +72,36 @@ class MainNavFragmentViewModelX(val db: DatabaseX, source: Source) : ViewModel()
         }
     }
 
-    var productsList = MediatorLiveData<MutableList<Product>>()
+    var productsList: LiveData<PagedList<Product>>
+
+    init {
+
+        val pagedListConfig = PagedList.Config.Builder()
+            .setPageSize(30)
+            .setPrefetchDistance(30)
+            .setEnablePlaceholders(false)
+            .build()
+        val request = request(source)
+
+        productsList = LivePagedListBuilder(
+            db.productDao.queryList(
+                installed = request.installed,
+                updates = request.updates,
+                searchQuery = request.searchQuery,
+                section = request.section,
+                order = request.order,
+                numberOfItems = request.numberOfItems
+            ), pagedListConfig
+        ).build()
+    }
 
     fun fillList(source: Source) {
-        viewModelScope.launch {
+        CoroutineScope(Dispatchers.Default).launch {
-            productsList.value = query(request(source))?.toMutableList()
+            // productsList = query(request(source))
         }
     }
 
-    private suspend fun query(request: Request): List<Product>? {
+    private suspend fun query(request: Request): DataSource.Factory<Int, Product> {
         return withContext(Dispatchers.Default) {
             db.productDao
                 .queryList(

src/main/kotlin/com/looker/droidify/utility/Utils.kt

@@ -10,6 +10,8 @@ import android.content.res.Configuration
 import android.database.Cursor
 import android.graphics.drawable.Drawable
 import android.os.Build
+import androidx.recyclerview.widget.AsyncDifferConfig
+import androidx.recyclerview.widget.DiffUtil
 import com.fasterxml.jackson.core.JsonGenerator
 import com.fasterxml.jackson.core.JsonParser
 import com.looker.droidify.*
@@ -235,3 +237,22 @@ fun jsonGenerate(callback: (JsonGenerator) -> Unit): ByteArray {
     Json.factory.createGenerator(outputStream).use { it.writeDictionary(callback) }
     return outputStream.toByteArray()
 }
+
+val PRODUCT_ASYNC_DIFFER_CONFIG
+    get() = AsyncDifferConfig.Builder(object :
+        DiffUtil.ItemCallback<com.looker.droidify.database.Product>() {
+        override fun areItemsTheSame(
+            oldItem: com.looker.droidify.database.Product,
+            newItem: com.looker.droidify.database.Product
+        ): Boolean {
+            return oldItem.repository_id == newItem.repository_id
+                    && oldItem.package_name == newItem.package_name
+        }
+
+        override fun areContentsTheSame(
+            oldItem: com.looker.droidify.database.Product,
+            newItem: com.looker.droidify.database.Product
+        ): Boolean {
+            return oldItem.data_item == newItem.data_item
+        }
+    }).build()