Fix #277, library not updating

app/src/main/java/eu/kanade/tachiyomi/event/LibraryMangaEvent.kt

@@ -5,7 +5,7 @@ import eu.kanade.tachiyomi.data.database.models.Manga
 
 class LibraryMangaEvent(val mangas: Map<Int, List<Manga>>) {
 
-    fun getMangasForCategory(category: Category): List<Manga>? {
+    fun getMangaForCategory(category: Category): List<Manga>? {
         return mangas[category.id]
     }
 }

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

@@ -15,7 +15,6 @@ import eu.kanade.tachiyomi.ui.base.fragment.BaseFragment
 import eu.kanade.tachiyomi.ui.manga.MangaActivity
 import kotlinx.android.synthetic.main.fragment_library_category.*
 import rx.Subscription
-import java.util.*
 
 /**
  * Fragment containing the library manga for a certain category.
@@ -34,14 +33,6 @@ class LibraryCategoryFragment : BaseFragment(), FlexibleViewHolder.OnListItemCli
      */
     private var position: Int = 0
 
-    /**
-     * Manga in this category.
-     */
-    private var mangas: List<Manga>? = null
-        set(value) {
-            field = value ?: ArrayList()
-        }
-
     /**
      * Subscription for the library manga.
      */
@@ -119,7 +110,7 @@ class LibraryCategoryFragment : BaseFragment(), FlexibleViewHolder.OnListItemCli
     override fun onResume() {
         super.onResume()
         libraryMangaSubscription = libraryPresenter.libraryMangaSubject
-                .subscribe { if (it != null) onNextLibraryManga(it) }
+                .subscribe { onNextLibraryManga(it) }
     }
 
     override fun onPause() {
@@ -134,8 +125,8 @@ class LibraryCategoryFragment : BaseFragment(), FlexibleViewHolder.OnListItemCli
     }
 
     /**
-     * Subscribe to [LibraryMangaEvent]. When an event is received, it updates [mangas] if needed
-     * and refresh the content of the adapter.
+     * Subscribe to [LibraryMangaEvent]. When an event is received, it updates the content of the
+     * adapter.
      *
      * @param event the event received.
      */
@@ -146,15 +137,11 @@ class LibraryCategoryFragment : BaseFragment(), FlexibleViewHolder.OnListItemCli
         // When a category is deleted, the index can be greater than the number of categories.
         if (position >= categories.size) return
 
-        // Get the manga list for this category
-        val mangaForCategory = event.getMangasForCategory(categories[position])
+        // Get the manga list for this category.
+        val mangaForCategory = event.getMangaForCategory(categories[position]) ?: emptyList()
 
-        // Update the list only if the reference to the list is different, avoiding reseting the
-        // adapter after every onResume.
-        if (mangas !== mangaForCategory) {
-            mangas = mangaForCategory
-            adapter.setItems(mangas ?: emptyList())
-        }
+        // Update the category with its manga.
+        adapter.setItems(mangaForCategory)
     }
 
     /**

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

@@ -125,6 +125,11 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        presenter.subscribeLibrary()
+    }
+
     override fun onDestroyView() {
         tabs.visibility = View.GONE
         super.onDestroyView()

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

@@ -44,7 +44,7 @@ class LibraryPresenter : BasePresenter<LibraryFragment>() {
     /**
      * Subject to notify the library's viewpager for updates.
      */
-    val libraryMangaSubject = BehaviorSubject.create<LibraryMangaEvent?>()
+    val libraryMangaSubject = BehaviorSubject.create<LibraryMangaEvent>()
 
     /**
      * Database.
@@ -91,18 +91,6 @@ class LibraryPresenter : BasePresenter<LibraryFragment>() {
 
     }
 
-    override fun onDropView() {
-        libraryMangaSubject.onNext(null)
-        super.onDropView()
-    }
-
-    override fun onTakeView(libraryFragment: LibraryFragment) {
-        super.onTakeView(libraryFragment)
-        if (isUnsubscribed(GET_LIBRARY)) {
-            start(GET_LIBRARY)
-        }
-    }
-
     /**
      * Get the categories and all its manga from the database.
      *
@@ -114,13 +102,6 @@ class LibraryPresenter : BasePresenter<LibraryFragment>() {
                 .observeOn(AndroidSchedulers.mainThread())
     }
 
-    /**
-     * Update the library information
-     */
-    fun updateLibrary() {
-        start(GET_LIBRARY)
-    }
-
     /**
      * Get the categories from the database.
      *
@@ -151,6 +132,22 @@ class LibraryPresenter : BasePresenter<LibraryFragment>() {
                 }
     }
 
+    /**
+     * Resubscribes to library if needed.
+     */
+    fun subscribeLibrary() {
+        if (isUnsubscribed(GET_LIBRARY)) {
+            start(GET_LIBRARY)
+        }
+    }
+
+    /**
+     * Resubscribes to library.
+     */
+    fun updateLibrary() {
+        start(GET_LIBRARY)
+    }
+
     /**
      * Filter library by preference
      *