Remember last active category. Closes #261

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -52,6 +52,8 @@ class PreferenceKeys(context: Context) {
 
     val lastUsedCatalogueSource = context.getString(R.string.pref_last_catalogue_source_key)
 
+    val lastUsedCategory = context.getString(R.string.pref_last_used_category_key)
+
     val seamlessMode = context.getString(R.string.pref_seamless_mode_key)
 
     val catalogueAsList = context.getString(R.string.pref_display_catalogue_as_list)
@@ -80,7 +82,6 @@ class PreferenceKeys(context: Context) {
 
     fun sourceUsername(sourceId: Int) = "pref_source_username_$sourceId"
 
-
     fun sourcePassword(sourceId: Int) = "pref_source_password_$sourceId"
 
     fun syncUsername(syncId: Int) = "pref_mangasync_username_$syncId"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -97,6 +97,8 @@ class PreferencesHelper(private val context: Context) {
 
     fun lastUsedCatalogueSource() = rxPrefs.getInteger(keys.lastUsedCatalogueSource, -1)
 
+    fun lastUsedCategory() = rxPrefs.getInteger(keys.lastUsedCategory, 0)
+
     fun seamlessMode() = prefs.getBoolean(keys.seamlessMode, true)
 
     fun catalogueAsList() = rxPrefs.getBoolean(keys.catalogueAsList, false)

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

@@ -4,6 +4,7 @@ import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
 import android.support.design.widget.TabLayout
+import android.support.v4.view.ViewPager
 import android.support.v7.view.ActionMode
 import android.support.v7.widget.SearchView
 import android.view.*
@@ -13,6 +14,7 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Category
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.library.LibraryUpdateService
+import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.event.LibraryMangaEvent
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
 import eu.kanade.tachiyomi.ui.category.CategoryActivity
@@ -116,12 +118,19 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
 
         adapter = LibraryAdapter(childFragmentManager)
         view_pager.adapter = adapter
+        view_pager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() {
+            override fun onPageSelected(position: Int) {
+                presenter.preferences.lastUsedCategory().set(position)
+            }
+        })
         tabs.setupWithViewPager(view_pager)
 
         if (savedState != null) {
             activeCategory = savedState.getInt(CATEGORY_KEY)
             query = savedState.getString(QUERY_KEY)
             presenter.searchSubject.onNext(query)
+        } else {
+            activeCategory = presenter.preferences.lastUsedCategory().getOrDefault()
         }
     }
 

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

@@ -46,13 +46,13 @@
     <string name="pref_remove_after_read_key">pref_remove_after_read_key</string>
     <string name="pref_remove_after_read_previous_key">pref_remove_after_read_previous_key</string>
 
+    <string name="pref_last_used_category_key">last_used_category</string>
 
     <string name="pref_source_languages">pref_source_languages</string>
 
     <string name="pref_clear_chapter_cache_key">pref_clear_chapter_cache_key</string>
     <string name="pref_clear_database_key">pref_clear_database_key</string>
 
-
     <string name="pref_version">pref_version</string>
     <string name="pref_build_time">pref_build_time</string>
     <string name="pref_enable_automatic_updates_key">pref_enable_automatic_updates_key</string>