Fix a bug when updating categories in library

app/src/main/java/eu/kanade/mangafeed/data/database/models/Category.java

@@ -29,4 +29,10 @@ public class Category implements Serializable {
         c.name = name;
         return c;
     }
+
+    public static Category createDefault() {
+        Category c = create("Default");
+        c.id = 0;
+        return c;
+    }
 }

app/src/main/java/eu/kanade/mangafeed/ui/library/LibraryFragment.java

@@ -8,6 +8,7 @@ import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
 import android.support.v4.view.ViewPager;
 import android.support.v7.view.ActionMode;
+import android.util.Pair;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -19,9 +20,11 @@ import com.afollestad.materialdialogs.MaterialDialog;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 import butterknife.Bind;
 import butterknife.ButterKnife;
+import de.greenrobot.event.EventBus;
 import eu.davidea.flexibleadapter.FlexibleAdapter;
 import eu.kanade.mangafeed.R;
 import eu.kanade.mangafeed.data.database.models.Category;
@@ -32,7 +35,6 @@ import eu.kanade.mangafeed.ui.base.activity.BaseActivity;
 import eu.kanade.mangafeed.ui.base.fragment.BaseRxFragment;
 import eu.kanade.mangafeed.ui.library.category.CategoryFragment;
 import eu.kanade.mangafeed.ui.main.MainActivity;
-import eu.kanade.mangafeed.util.EventBusHook;
 import nucleus.factory.RequiresPresenter;
 
 @RequiresPresenter(LibraryPresenter.class)
@@ -82,18 +84,6 @@ public class LibraryFragment extends BaseRxFragment<LibraryPresenter>
         super.onDestroyView();
     }
 
-    @Override
-    public void onResume() {
-        super.onResume();
-        registerForStickyEvents(1);
-    }
-
-    @Override
-    public void onPause() {
-        unregisterForEvents();
-        super.onPause();
-    }
-
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.library, menu);
@@ -121,31 +111,30 @@ public class LibraryFragment extends BaseRxFragment<LibraryPresenter>
         ((MainActivity) getActivity()).pushFragment(fragment);
     }
 
-    @EventBusHook
-    public void onEventMainThread(LibraryMangasEvent event) {
-        List<Manga> mangasInDefaultCategory = event.getMangas().get(0);
-        boolean hasDefaultCategory = adapter.hasDefaultCategory();
+    public void onNextLibraryUpdate(Pair<List<Category>, Map<Integer, List<Manga>>> pair) {
+        boolean mangasInDefaultCategory = pair.second.get(0) != null;
+        boolean initialized = adapter.categories != null;
+
         // If there are mangas in the default category and the adapter doesn't have it,
         // create the default category
-        if (mangasInDefaultCategory != null && !hasDefaultCategory) {
-            setCategoriesWithDefault(getPresenter().categories);
+        if (mangasInDefaultCategory && (!initialized || !adapter.hasDefaultCategory())) {
+            setCategoriesWithDefault(pair.first);
         }
         // If there aren't mangas in the default category and the adapter have it,
         // remove the default category
-        else if (mangasInDefaultCategory == null && hasDefaultCategory) {
-            setCategories(getPresenter().categories);
+        else if (!mangasInDefaultCategory && (!initialized || adapter.hasDefaultCategory())) {
+            setCategories(pair.first);
         }
+        // Send the mangas to child fragments after the adapter is updated
+        EventBus.getDefault().postSticky(new LibraryMangasEvent(pair.second));
     }
 
-    public void setCategoriesWithDefault(List<Category> categories) {
-        List<Category> actualCategories = new ArrayList<>();
+    private void setCategoriesWithDefault(List<Category> categories) {
+        List<Category> categoriesWithDefault = new ArrayList<>();
+        categoriesWithDefault.add(Category.createDefault());
+        categoriesWithDefault.addAll(categories);
 
-        Category defaultCat = Category.create("Default");
-        defaultCat.id = 0;
-        actualCategories.add(defaultCat);
-
-        actualCategories.addAll(categories);
-        setCategories(actualCategories);
+        setCategories(categoriesWithDefault);
     }
 
     private void setCategories(List<Category> categories) {

app/src/main/java/eu/kanade/mangafeed/ui/library/LibraryPresenter.java

@@ -20,7 +20,6 @@ import eu.kanade.mangafeed.data.source.SourceManager;
 import eu.kanade.mangafeed.event.LibraryMangasEvent;
 import eu.kanade.mangafeed.ui.base.presenter.BasePresenter;
 import rx.Observable;
-import rx.Subscription;
 import rx.android.schedulers.AndroidSchedulers;
 
 public class LibraryPresenter extends BasePresenter<LibraryFragment> {
@@ -33,9 +32,7 @@ public class LibraryPresenter extends BasePresenter<LibraryFragment> {
     protected List<Category> categories;
     protected List<Manga> selectedMangas;
 
-    private Subscription librarySubscription;
-
-    private static final int GET_CATEGORIES = 1;
+    private static final int GET_LIBRARY = 1;
 
     @Override
     protected void onCreate(Bundle savedState) {
@@ -43,11 +40,11 @@ public class LibraryPresenter extends BasePresenter<LibraryFragment> {
 
         selectedMangas = new ArrayList<>();
 
-        restartableLatestCache(GET_CATEGORIES,
-                this::getCategoriesObservable,
-                LibraryFragment::setCategoriesWithDefault);
+        restartableLatestCache(GET_LIBRARY,
+                this::getLibraryObservable,
+                LibraryFragment::onNextLibraryUpdate);
 
-        start(GET_CATEGORIES);
+        start(GET_LIBRARY);
     }
 
     @Override
@@ -56,13 +53,15 @@ public class LibraryPresenter extends BasePresenter<LibraryFragment> {
         super.onDestroy();
     }
 
+    private Observable<Pair<List<Category>, Map<Integer, List<Manga>>>> getLibraryObservable() {
+        return Observable.combineLatest(getCategoriesObservable(), getLibraryMangasObservable(),
+                Pair::create)
+                .observeOn(AndroidSchedulers.mainThread());
+    }
+
     public Observable<List<Category>> getCategoriesObservable() {
         return db.getCategories().createObservable()
-                .doOnNext(categories -> {
-                    this.categories = categories;
-                    subscribeToLibrary();
-                })
-                .observeOn(AndroidSchedulers.mainThread());
+                .doOnNext(categories -> this.categories = categories);
     }
 
     private Observable<Map<Integer, List<Manga>>> getLibraryMangasObservable() {
@@ -74,14 +73,6 @@ public class LibraryPresenter extends BasePresenter<LibraryFragment> {
                         .toMap(pair -> pair.first, pair -> pair.second));
     }
 
-    private void subscribeToLibrary() {
-        if (librarySubscription != null && !librarySubscription.isUnsubscribed())
-            return;
-
-        add(librarySubscription = getLibraryMangasObservable().subscribe(
-                mangas -> EventBus.getDefault().postSticky(new LibraryMangasEvent(mangas))));
-    }
-
     public void setSelection(Manga manga, boolean selected) {
         if (selected) {
             selectedMangas.add(manga);

app/src/main/res/xml/pref_about.xml

@@ -5,7 +5,7 @@
         android:key="acra.enable"
         android:title="@string/pref_enable_acra"
         android:summary="@string/pref_acra_summary"
-        android:defaultValue="false"/>
+        android:defaultValue="true"/>
 
     <Preference
         android:key="@string/pref_version"