Use EventBus

app/src/main/java/eu/kanade/mangafeed/presenter/MangaChaptersPresenter.java

@@ -16,6 +16,7 @@ public class MangaChaptersPresenter extends BasePresenter<MangaChaptersFragment>
     @Inject DatabaseHelper db;
     @Inject SourceManager sourceManager;
 
+    private Manga manga;
     private Subscription chaptersSubscription;
     private Subscription onlineChaptersSubscription;
     private boolean doingRequest = false;
@@ -23,26 +24,34 @@ public class MangaChaptersPresenter extends BasePresenter<MangaChaptersFragment>
     @Override
     protected void onTakeView(MangaChaptersFragment view) {
         super.onTakeView(view);
-
-        getChapters(view.getMangaId());
+        registerForStickyEvents();
     }
 
-    public void refreshChapters(Manga manga) {
+    @Override
+    protected void onDropView() {
+        unregisterForEvents();
+        super.onDropView();
+    }
+
+    public void onEventMainThread(Manga manga) {
+        this.manga = manga;
+        getChapters();
+    }
+
+    public void refreshChapters() {
         if (manga != null && !doingRequest)
             getChaptersFromSource(manga);
     }
 
-    private void getChapters(long manga_id) {
+    public void getChapters() {
         if (chaptersSubscription != null)
-            remove(chaptersSubscription);
+            return;
 
-        chaptersSubscription = db.getChapters(manga_id)
+        add(chaptersSubscription = db.getChapters(manga.id)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .compose(deliverLatestCache())
-                .subscribe(this.split(MangaChaptersFragment::onNextChapters));
-
-        add(chaptersSubscription);
+                .subscribe(this.split(MangaChaptersFragment::onNextChapters)));
     }
 
     public void getChaptersFromSource(Manga manga) {

app/src/main/java/eu/kanade/mangafeed/presenter/MangaDetailPresenter.java

@@ -2,7 +2,9 @@ package eu.kanade.mangafeed.presenter;
 
 import javax.inject.Inject;
 
+import de.greenrobot.event.EventBus;
 import eu.kanade.mangafeed.data.helpers.DatabaseHelper;
+import eu.kanade.mangafeed.data.models.Manga;
 import eu.kanade.mangafeed.ui.activity.MangaDetailActivity;
 import rx.Observable;
 import rx.Subscription;
@@ -13,25 +15,32 @@ public class MangaDetailPresenter extends BasePresenter<MangaDetailActivity> {
 
     @Inject DatabaseHelper db;
 
+    private Manga manga;
     private Subscription mangaSubscription;
 
     @Override
     protected void onTakeView(MangaDetailActivity view) {
         super.onTakeView(view);
+        if (manga != null)
+            view.setManga(manga);
 
-        if (mangaSubscription == null)
-            initializeManga(view);
+        getManga(view);
     }
 
-    private void initializeManga(MangaDetailActivity view) {
-        mangaSubscription = db.getManga(view.getMangaId())
+    private void getManga(MangaDetailActivity view) {
+        if (mangaSubscription != null)
+            return;
+
+        add(mangaSubscription = db.getManga(view.getMangaId())
                 .subscribeOn(Schedulers.io())
                 .take(1)
                 .flatMap(Observable::from)
                 .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(view::onMangaNext);
-
-        add(mangaSubscription);
+                .subscribe(manga -> {
+                    this.manga = manga;
+                    view.setManga(manga);
+                    EventBus.getDefault().postSticky(manga);
+                }));
     }
 
 }

app/src/main/java/eu/kanade/mangafeed/presenter/MangaInfoPresenter.java

@@ -3,34 +3,47 @@ package eu.kanade.mangafeed.presenter;
 import javax.inject.Inject;
 
 import eu.kanade.mangafeed.data.helpers.DatabaseHelper;
+import eu.kanade.mangafeed.data.models.Manga;
 import eu.kanade.mangafeed.ui.fragment.MangaInfoFragment;
 import rx.Observable;
 import rx.Subscription;
 import rx.android.schedulers.AndroidSchedulers;
+import rx.schedulers.Schedulers;
 
 public class MangaInfoPresenter extends BasePresenter<MangaInfoFragment> {
 
     @Inject DatabaseHelper db;
 
+    private Manga manga;
     private Subscription mangaInfoSubscription;
 
     @Override
     protected void onTakeView(MangaInfoFragment view) {
         super.onTakeView(view);
-
-        getMangaInfo(view);
+        registerForStickyEvents();
     }
 
-    private void getMangaInfo(MangaInfoFragment view) {
-        if (mangaInfoSubscription != null)
-            remove(mangaInfoSubscription);
+    @Override
+    protected void onDropView() {
+        unregisterForEvents();
+        super.onDropView();
+    }
 
-        mangaInfoSubscription = db.getManga(view.getMangaId())
-                .observeOn(AndroidSchedulers.mainThread())
+    public void onEventMainThread(Manga manga) {
+        this.manga = manga;
+        getMangaInfo();
+    }
+
+    private void getMangaInfo() {
+        if (mangaInfoSubscription != null)
+            return;
+
+        add(mangaInfoSubscription = db.getManga(manga.id)
+                .subscribeOn(Schedulers.io())
                 .take(1)
                 .flatMap(Observable::from)
-                .subscribe(view::setMangaInfo);
-
-        add(mangaInfoSubscription);
+                .observeOn(AndroidSchedulers.mainThread())
+                .compose(deliverLatestCache())
+                .subscribe(split(MangaInfoFragment::setMangaInfo)));
     }
 }