Some bugfixes

app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/CatalogueFragment.kt

@@ -2,7 +2,6 @@ package eu.kanade.tachiyomi.ui.catalogue
 
 import android.os.Bundle
 import android.support.v7.widget.GridLayoutManager
-import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.SearchView
 import android.support.v7.widget.Toolbar
 import android.view.*
@@ -24,6 +23,7 @@ import eu.kanade.tachiyomi.util.snack
 import eu.kanade.tachiyomi.util.toast
 import eu.kanade.tachiyomi.widget.EndlessGridScrollListener
 import eu.kanade.tachiyomi.widget.EndlessListScrollListener
+import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
 import kotlinx.android.synthetic.main.fragment_catalogue.*
 import kotlinx.android.synthetic.main.toolbar.*
 import nucleus.factory.RequiresPresenter
@@ -150,7 +150,7 @@ class CatalogueFragment : BaseRxFragment<CataloguePresenter>(), FlexibleViewHold
         catalogue_grid.adapter = adapter
         catalogue_grid.addOnScrollListener(gridScrollListener)
 
-        val llm = LinearLayoutManager(activity)
+        val llm = NpaLinearLayoutManager(activity)
         listScrollListener = EndlessListScrollListener(llm, { requestNextPage() })
         catalogue_list.setHasFixedSize(true)
         catalogue_list.adapter = adapter

app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/CatalogueGridHolder.kt

@@ -42,7 +42,7 @@ class CatalogueGridHolder(private val view: View, private val adapter: Catalogue
      * @param manga the manga to bind.
      */
     fun setImage(manga: Manga) {
-        if (manga.thumbnail_url != null) {
+        if (!manga.thumbnail_url.isNullOrEmpty()) {
             val url = manga.thumbnail_url!!
             val headers = adapter.fragment.presenter.source.glideHeaders
 

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryActivity.kt

@@ -4,7 +4,6 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.support.v7.view.ActionMode
-import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
 import android.support.v7.widget.helper.ItemTouchHelper
 import android.view.Menu
@@ -16,6 +15,7 @@ import eu.kanade.tachiyomi.data.database.models.Category
 import eu.kanade.tachiyomi.ui.base.activity.BaseRxActivity
 import eu.kanade.tachiyomi.ui.base.adapter.FlexibleViewHolder
 import eu.kanade.tachiyomi.ui.base.adapter.OnStartDragListener
+import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
 import kotlinx.android.synthetic.main.activity_edit_categories.*
 import kotlinx.android.synthetic.main.toolbar.*
 import nucleus.factory.RequiresPresenter
@@ -70,7 +70,7 @@ class CategoryActivity : BaseRxActivity<CategoryPresenter>(), ActionMode.Callbac
         adapter = CategoryAdapter(this)
 
         // Create view and inject category items into view
-        recycler.layoutManager = LinearLayoutManager(this)
+        recycler.layoutManager = NpaLinearLayoutManager(this)
         recycler.setHasFixedSize(true)
         recycler.adapter = adapter
 

app/src/main/java/eu/kanade/tachiyomi/ui/download/DownloadFragment.kt

@@ -1,13 +1,13 @@
 package eu.kanade.tachiyomi.ui.download
 
 import android.os.Bundle
-import android.support.v7.widget.LinearLayoutManager
 import android.view.*
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.download.DownloadService
 import eu.kanade.tachiyomi.data.download.model.Download
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
 import eu.kanade.tachiyomi.ui.main.MainActivity
+import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
 import kotlinx.android.synthetic.main.fragment_download_queue.*
 import nucleus.factory.RequiresPresenter
 import rx.Subscription
@@ -82,7 +82,7 @@ class DownloadFragment : BaseRxFragment<DownloadPresenter>() {
         recycler.adapter = adapter
 
         // Set the layout manager for the recycler and fixed size.
-        recycler.layoutManager = LinearLayoutManager(activity)
+        recycler.layoutManager = NpaLinearLayoutManager(activity)
         recycler.setHasFixedSize(true)
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt

@@ -16,7 +16,7 @@ import java.util.*
  *
  * @param fragment the fragment containing this adapter.
  */
-class LibraryCategoryAdapter(private val fragment: LibraryCategoryFragment) :
+class LibraryCategoryAdapter(val fragment: LibraryCategoryFragment) :
         FlexibleAdapter<LibraryHolder, Manga>() {
 
     /**

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHolder.kt

@@ -19,7 +19,7 @@ import kotlinx.android.synthetic.main.item_catalogue_grid.view.*
  * @param listener a listener to react to single tap and long tap events.
  * @constructor creates a new library holder.
  */
-class LibraryHolder(private val view: View, adapter: LibraryCategoryAdapter, listener: FlexibleViewHolder.OnListItemClickListener) :
+class LibraryHolder(private val view: View, private val adapter: LibraryCategoryAdapter, listener: FlexibleViewHolder.OnListItemClickListener) :
         FlexibleViewHolder(view, adapter, listener) {
 
     private var manga: Manga? = null
@@ -55,9 +55,9 @@ class LibraryHolder(private val view: View, adapter: LibraryCategoryAdapter, lis
      * @param coverCache the cache that stores the cover in the filesystem.
      */
     private fun loadCover(manga: Manga, source: Source, coverCache: CoverCache) {
-        if (manga.thumbnail_url != null) {
+        if (!manga.thumbnail_url.isNullOrEmpty()) {
             coverCache.saveOrLoadFromCache(manga.thumbnail_url, source.glideHeaders) {
-                if (this.manga == manga) {
+                if (adapter.fragment.isResumed && this.manga == manga) {
                     Glide.with(view.context)
                             .load(it)
                             .diskCacheStrategy(DiskCacheStrategy.RESULT)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersFragment.kt

@@ -5,7 +5,6 @@ import android.animation.AnimatorListenerAdapter
 import android.content.Intent
 import android.os.Bundle
 import android.support.v7.view.ActionMode
-import android.support.v7.widget.LinearLayoutManager
 import android.view.*
 import com.afollestad.materialdialogs.MaterialDialog
 import eu.davidea.flexibleadapter.FlexibleAdapter
@@ -22,6 +21,7 @@ import eu.kanade.tachiyomi.ui.reader.ReaderActivity
 import eu.kanade.tachiyomi.util.getCoordinates
 import eu.kanade.tachiyomi.util.getResourceDrawable
 import eu.kanade.tachiyomi.util.toast
+import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
 import kotlinx.android.synthetic.main.fragment_manga_chapters.*
 import nucleus.factory.RequiresPresenter
 import rx.Observable
@@ -66,7 +66,7 @@ class ChaptersFragment : BaseRxFragment<ChaptersPresenter>(), ActionMode.Callbac
         adapter = ChaptersAdapter(this)
 
         recycler.adapter = adapter
-        recycler.layoutManager = LinearLayoutManager(activity)
+        recycler.layoutManager = NpaLinearLayoutManager(activity)
         recycler.addItemDecoration(DividerItemDecoration(
                 context.theme.getResourceDrawable(R.attr.divider_drawable)))
         recycler.setHasFixedSize(true)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -51,8 +51,8 @@ class ReaderPresenter : BasePresenter<ReaderActivity>() {
     private var previousChapter: Chapter? = null
     private var mangaSyncList: List<MangaSync>? = null
 
-    private lateinit var retryPageSubject: PublishSubject<Page>
-    private lateinit var pageInitializerSubject: PublishSubject<Chapter>
+    private val retryPageSubject by lazy { PublishSubject.create<Page>() }
+    private val pageInitializerSubject by lazy { PublishSubject.create<Chapter>() }
 
     val isSeamlessMode by lazy { prefs.seamlessMode() }
 
@@ -120,7 +120,6 @@ class ReaderPresenter : BasePresenter<ReaderActivity>() {
 
     private fun initializeSubjects() {
         // Listen for pages initialization events
-        pageInitializerSubject = PublishSubject.create<Chapter>()
         add(pageInitializerSubject.observeOn(Schedulers.io())
                 .concatMap { ch ->
                     val observable: Observable<Page>
@@ -141,7 +140,6 @@ class ReaderPresenter : BasePresenter<ReaderActivity>() {
                 }.subscribe())
 
         // Listen por retry events
-        retryPageSubject = PublishSubject.create<Page>()
         add(retryPageSubject.observeOn(Schedulers.io())
                 .flatMap { page ->
                     if (page.imageUrl == null)

app/src/main/java/eu/kanade/tachiyomi/ui/recent/RecentChaptersFragment.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.ui.recent
 
 import android.os.Bundle
-import android.support.v7.widget.LinearLayoutManager
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -17,6 +16,7 @@ import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
 import eu.kanade.tachiyomi.ui.main.MainActivity
 import eu.kanade.tachiyomi.ui.reader.ReaderActivity
 import eu.kanade.tachiyomi.util.getResourceDrawable
+import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
 import kotlinx.android.synthetic.main.fragment_recent_chapters.*
 import nucleus.factory.RequiresPresenter
 import rx.Observable
@@ -67,7 +67,7 @@ class RecentChaptersFragment : BaseRxFragment<RecentChaptersPresenter>(), Flexib
      */
     override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
         // Init RecyclerView and adapter
-        recycler.layoutManager = LinearLayoutManager(activity)
+        recycler.layoutManager = NpaLinearLayoutManager(activity)
         recycler.addItemDecoration(DividerItemDecoration(context.theme.getResourceDrawable(R.attr.divider_drawable)))
         recycler.setHasFixedSize(true)
         adapter = RecentChaptersAdapter(this)

app/src/main/java/eu/kanade/tachiyomi/widget/NpaGridLayoutManager.kt

@@ -0,0 +1,27 @@
+package eu.kanade.tachiyomi.widget
+
+import android.content.Context
+import android.support.v7.widget.GridLayoutManager
+import android.util.AttributeSet
+
+/**
+ * No Predictive Animations GridLayoutManager
+ */
+open class NpaGridLayoutManager : GridLayoutManager {
+
+    constructor(context: Context, spanCount: Int) : super(context, spanCount) {}
+
+    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int, defStyleRes: Int)
+        : super(context, attrs, defStyleAttr, defStyleRes) {}
+
+    constructor(context: Context, spanCount: Int, orientation: Int, reverseLayout: Boolean)
+        : super(context, spanCount, orientation, reverseLayout) {}
+
+    /**
+     * Disable predictive animations. There is a bug in RecyclerView which causes views that
+     * are being reloaded to pull invalid ViewHolders from the internal recycler stack if the
+     * adapter size has decreased since the ViewHolder was recycled.
+     */
+    override fun supportsPredictiveItemAnimations() = false
+
+}

app/src/main/java/eu/kanade/tachiyomi/widget/NpaLinearLayoutManager.kt

@@ -0,0 +1,27 @@
+package eu.kanade.tachiyomi.widget
+
+import android.content.Context
+import android.support.v7.widget.LinearLayoutManager
+import android.util.AttributeSet
+
+/**
+ * No Predictive Animations LinearLayoutManager
+ */
+open class NpaLinearLayoutManager : LinearLayoutManager {
+
+    constructor(context: Context): super(context) {}
+
+    constructor(context: Context, orientation: Int, reverseLayout: Boolean)
+        : super(context, orientation, reverseLayout) {}
+
+    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int, defStyleRes: Int)
+        : super(context, attrs, defStyleAttr, defStyleRes) {}
+
+    /**
+     * Disable predictive animations. There is a bug in RecyclerView which causes views that
+     * are being reloaded to pull invalid ViewHolders from the internal recycler stack if the
+     * adapter size has decreased since the ViewHolder was recycled.
+     */
+    override fun supportsPredictiveItemAnimations() = false
+
+}

app/src/main/java/eu/kanade/tachiyomi/widget/PreCachingLayoutManager.kt

@@ -1,10 +1,9 @@
 package eu.kanade.tachiyomi.widget
 
 import android.content.Context
-import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
 
-class PreCachingLayoutManager(context: Context) : LinearLayoutManager(context) {
+class PreCachingLayoutManager(context: Context) : NpaLinearLayoutManager(context) {
 
     companion object {
         const val DEFAULT_EXTRA_LAYOUT_SPACE = 600
@@ -19,7 +18,4 @@ class PreCachingLayoutManager(context: Context) : LinearLayoutManager(context) {
         return DEFAULT_EXTRA_LAYOUT_SPACE
     }
 
-    // http://stackoverflow.com/questions/30220771/recyclerview-inconsistency-detected-invalid-item-position
-    override fun supportsPredictiveItemAnimations() = false
-
 }