Swipe down updates active category. Closes #292. Not sure I'll keep this

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

@@ -9,10 +9,12 @@ import com.f2prateek.rx.preferences.Preference
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.library.LibraryUpdateService
 import eu.kanade.tachiyomi.event.LibraryMangaEvent
 import eu.kanade.tachiyomi.ui.base.adapter.FlexibleViewHolder
 import eu.kanade.tachiyomi.ui.base.fragment.BaseFragment
 import eu.kanade.tachiyomi.ui.manga.MangaActivity
+import eu.kanade.tachiyomi.util.toast
 import kotlinx.android.synthetic.main.fragment_library_category.*
 import rx.Subscription
 
@@ -99,6 +101,17 @@ class LibraryCategoryFragment : BaseFragment(), FlexibleViewHolder.OnListItemCli
                 adapter.clearSelection()
             }
         }
+
+        swipe_refresh.setOnRefreshListener {
+            if (!LibraryUpdateService.isRunning(activity)) {
+                libraryPresenter.categories.getOrNull(position)?.let {
+                    LibraryUpdateService.start(activity, true, it)
+                    context.toast(R.string.updating_category)
+                }
+            }
+            // It can be a very long operation, so we disable swipe refresh and show a toast.
+            swipe_refresh.isRefreshing = false
+        }
     }
 
     override fun onDestroyView() {

app/src/main/res/layout/fragment_library_category.xml

@@ -4,6 +4,11 @@
              android:layout_width="match_parent"
              android:layout_height="match_parent">
 
+    <android.support.v4.widget.SwipeRefreshLayout
+        android:id="@+id/swipe_refresh"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
         <eu.kanade.tachiyomi.widget.AutofitRecyclerView
             android:id="@+id/recycler"
             style="@style/Theme.Widget.GridView"
@@ -12,4 +17,6 @@
             android:columnWidth="140dp"
             tools:listitem="@layout/item_catalogue_grid"/>
 
+    </android.support.v4.widget.SwipeRefreshLayout>
+
 </FrameLayout>

app/src/main/res/values/strings.xml

@@ -190,6 +190,7 @@
     <!-- Library fragment -->
     <string name="library_search_hint">Title or author…</string>
     <string name="library_selection_title">Selected</string>
+    <string name="updating_category">Updating category</string>
 
     <!-- Catalogue fragment -->
     <string name="source_requires_login">This source requires you to log in</string>