Fix some crashes

app/src/main/java/eu/kanade/mangafeed/ui/catalogue/CatalogueFragment.java

@@ -89,19 +89,19 @@ public class CatalogueFragment extends BaseRxFragment<CataloguePresenter> {
         CatalogueSpinnerAdapter spinnerAdapter = new CatalogueSpinnerAdapter(themedContext,
                 android.R.layout.simple_spinner_item, getPresenter().getEnabledSources());
         spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        if (savedState == null) selectedIndex = spinnerAdapter.getEmptyIndex();
         spinner.setAdapter(spinnerAdapter);
-        spinner.setSelection(savedState == null ? spinnerAdapter.getEmptyIndex() : selectedIndex);
+        spinner.setSelection(selectedIndex);
         spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                 Source source = spinnerAdapter.getItem(position);
                 // We add an empty source with id -1 that acts as a placeholder to show a hint
                 // that asks to select a source
-                if (source.getId() != -1 && selectedIndex != position) {
+                if (source.getId() != -1 && (selectedIndex != position || adapter.isEmpty())) {
                     // Set previous selection if it's not a valid source and notify the user
                     if (!getPresenter().isValidSource(source)) {
-                        spinner.setSelection(selectedIndex != -1 ? selectedIndex :
-                                spinnerAdapter.getEmptyIndex());
+                        spinner.setSelection(spinnerAdapter.getEmptyIndex());
                         ToastUtil.showShort(getActivity(), R.string.source_requires_login);
                     } else {
                         selectedIndex = position;

app/src/main/java/eu/kanade/mangafeed/ui/catalogue/CataloguePresenter.java

@@ -50,6 +50,10 @@ public class CataloguePresenter extends BasePresenter<CatalogueFragment> {
     protected void onCreate(Bundle savedState) {
         super.onCreate(savedState);
 
+        if (savedState != null) {
+            onProcessRestart();
+        }
+
         mangaDetailSubject = PublishSubject.create();
 
         restartableReplay(GET_MANGA_LIST,
@@ -80,6 +84,11 @@ public class CataloguePresenter extends BasePresenter<CatalogueFragment> {
                 (view, error) -> Timber.e(error.getMessage()));
     }
 
+    private void onProcessRestart() {
+        stop(GET_MANGA_LIST);
+        stop(GET_MANGA_DETAIL);
+    }
+
     @Override
     protected void onDestroy() {
         // Catalogue covers are probably not going to be needed for a long time

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

@@ -181,7 +181,8 @@ public class ChaptersFragment extends BaseRxFragment<ChaptersPresenter> implemen
 
     private void observeChapterDownloadProgress() {
         downloadProgressSubscription = getPresenter().getDownloadProgressObs()
-                .subscribe(this::onDownloadProgressChange);
+                .subscribe(this::onDownloadProgressChange,
+                        error -> { /* TODO getting a NPE sometimes on 'manga' from presenter */ });
     }
 
     private void unsubscribeChapterDownloadProgress() {

app/src/main/java/eu/kanade/mangafeed/ui/reader/ReaderPresenter.java

@@ -78,9 +78,7 @@ public class ReaderPresenter extends BasePresenter<ReaderActivity> {
                     if (currentPage != 0)
                         view.setSelectedPage(currentPage);
                 },
-                (view, error) -> {
-                    view.onChapterError();
-                });
+                (view, error) -> view.onChapterError());
 
         restartableReplay(GET_PAGE_IMAGES,
                 () -> getPageImagesObservable()
@@ -104,10 +102,8 @@ public class ReaderPresenter extends BasePresenter<ReaderActivity> {
     @Override
     protected void onDestroy() {
         unregisterForEvents();
-        if (pageList != null && isChapterFinished()) {
-            updateMangaSyncLastChapterRead();
-        }
         onChapterLeft();
+        updateMangaSyncLastChapterRead();
         super.onDestroy();
     }
 
@@ -241,6 +237,9 @@ public class ReaderPresenter extends BasePresenter<ReaderActivity> {
     }
 
     private void updateMangaSyncLastChapterRead() {
+        if (pageList == null)
+            return;
+
         db.getMangaSync(manga).createObservable()
                 .take(1)
                 .flatMap(Observable::from)
@@ -249,15 +248,21 @@ public class ReaderPresenter extends BasePresenter<ReaderActivity> {
                     if (!service.isLogged())
                         return;
 
-                    int lastChapterReadLocal = (int) Math.floor(chapter.chapter_number);
-                    int lastChapterReadRemote = mangaSync.last_chapter_read;
+                    int lastChapterReadLocal = 0;
+                    // If the current chapter has been read, we check with this one
+                    if (chapter.read)
+                        lastChapterReadLocal = (int) Math.floor(chapter.chapter_number);
+                    // If not, we check if the previous chapter has been read
+                    else if (previousChapter != null && previousChapter.read)
+                        lastChapterReadLocal = (int) Math.floor(previousChapter.chapter_number);
 
-                    if (lastChapterReadLocal > lastChapterReadRemote) {
+                    if (lastChapterReadLocal > mangaSync.last_chapter_read) {
                         mangaSync.last_chapter_read = lastChapterReadLocal;
                         UpdateMangaSyncService.start(getContext(), mangaSync);
                     }
                 })
-                .subscribe();
+                .subscribe(next -> {},
+                        error -> Timber.e(error.getCause(), error.getMessage()));
     }
 
     public void setCurrentPage(int currentPage) {