Use SharedPreferences to store post feed scrolled position instead of QNCache. Add an option to save the scrolled position.

9 files changed, 200 insertions, 125 deletions

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java b/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
index fbbba343..9b930855 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
@@ -6,7 +6,6 @@ import android.content.SharedPreferences;
 
 import androidx.preference.PreferenceManager;
 
-import com.fewlaps.quitnowcache.QNCache;
 import com.google.android.exoplayer2.database.ExoDatabaseProvider;
 import com.google.android.exoplayer2.upstream.cache.LeastRecentlyUsedCacheEvictor;
 import com.google.android.exoplayer2.upstream.cache.SimpleCache;
@@ -24,8 +23,8 @@ import im.ene.toro.exoplayer.ExoCreator;
 import im.ene.toro.exoplayer.MediaSourceBuilder;
 import im.ene.toro.exoplayer.ToroExo;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
-import ml.docilealligator.infinityforreddit.Utils.CustomThemeSharedPreferencesUtils;
 import ml.docilealligator.infinityforreddit.Utils.APIUtils;
+import ml.docilealligator.infinityforreddit.Utils.CustomThemeSharedPreferencesUtils;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import okhttp3.ConnectionPool;
 import okhttp3.OkHttpClient;
@@ -201,6 +200,12 @@ class AppModule {
     }
 
     @Provides
+    @Named("post_feed_scrolled_position_cache")
+    SharedPreferences providePostFeedScrolledPositionSharedPreferences() {
+        return mApplication.getSharedPreferences(SharedPreferencesUtils.POST_LAYOUT_SHARED_PREFERENCES_FILE, Context.MODE_PRIVATE);
+    }
+
+    @Provides
     @Singleton
     CustomThemeWrapper provideCustomThemeWrapper(@Named("light_theme") SharedPreferences lightThemeSharedPreferences,
                                                  @Named("dark_theme") SharedPreferences darkThemeSharedPreferences,
@@ -217,10 +222,4 @@ class AppModule {
                 .build();
         return ToroExo.with(mApplication).getCreator(config);
     }
-
-    @Provides
-    @Singleton
-    QNCache<String> provideQNCache() {
-        return new QNCache.Builder().build();
-    }
 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Event/ChangeSavePostFeedScrolledPositionEvent.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Event/ChangeSavePostFeedScrolledPositionEvent.java
new file mode 100644
index 00000000..5dd363eb
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Event/ChangeSavePostFeedScrolledPositionEvent.java
@@ -0,0 +1,9 @@
+package ml.docilealligator.infinityforreddit.Event;
+
+public class ChangeSavePostFeedScrolledPositionEvent {
+    public boolean savePostFeedScrolledPosition;
+
+    public ChangeSavePostFeedScrolledPositionEvent(boolean savePostFeedScrolledPosition) {
+        this.savePostFeedScrolledPosition = savePostFeedScrolledPosition;
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
index d825c619..6a574860 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
@@ -38,7 +38,6 @@ import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
-import com.fewlaps.quitnowcache.QNCache;
 
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
@@ -67,6 +66,7 @@ import ml.docilealligator.infinityforreddit.Event.ChangeMuteAutoplayingVideosEve
 import ml.docilealligator.infinityforreddit.Event.ChangeMuteNSFWVideoEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWBlurEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangePostLayoutEvent;
+import ml.docilealligator.infinityforreddit.Event.ChangeSavePostFeedScrolledPositionEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeShowAbsoluteNumberOfVotesEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeShowElapsedTimeEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeSpoilerBlurEvent;
@@ -87,7 +87,6 @@ import ml.docilealligator.infinityforreddit.Post.PostViewModel;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.SortType;
-import ml.docilealligator.infinityforreddit.Utils.CacheUtils;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import ml.docilealligator.infinityforreddit.Utils.Utils;
 import retrofit2.Retrofit;
@@ -147,7 +146,8 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     @Inject
     ExoCreator exoCreator;
     @Inject
-    QNCache<String> cache;
+    @Named("post_feed_scrolled_position_cache")
+    SharedPreferences postFeedScrolledPositionSharedPreferences;
     private RequestManager mGlide;
     private AppCompatActivity activity;
     private LinearLayoutManager mLinearLayoutManager;
@@ -157,6 +157,7 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     private boolean isLazyModePaused = false;
     private boolean hasPost = false;
     private boolean isShown = false;
+    private boolean savePostFeedScrolledPosition;
     private PostRecyclerViewAdapter mAdapter;
     private RecyclerView.SmoothScroller smoothScroller;
     private Window window;
@@ -368,6 +369,7 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
         accountName = getArguments().getString(EXTRA_ACCOUNT_NAME);
         boolean nsfw = mSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_KEY, false);
         int defaultPostLayout = Integer.parseInt(mSharedPreferences.getString(SharedPreferencesUtils.DEFAULT_POST_LAYOUT_KEY, "0"));
+        savePostFeedScrolledPosition = mSharedPreferences.getBoolean(SharedPreferencesUtils.SAVE_POST_FEED_SCROLLED_POSITION, true);
         Locale locale = getResources().getConfiguration().locale;
 
         if (postType == PostDataSource.TYPE_SEARCH) {
@@ -407,12 +409,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
             if (accessToken == null) {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mRetrofit, null,
-                        accountName, getResources().getConfiguration().locale, cache, subredditName, query, postType,
-                        sortType, filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, query, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             } else {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mOauthRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, subredditName, query, postType,
-                        sortType, filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, query, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             }
         } else if (postType == PostDataSource.TYPE_SUBREDDIT) {
             subredditName = getArguments().getString(EXTRA_NAME);
@@ -475,12 +477,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
             if (accessToken == null) {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, subredditName, postType, sortType,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             } else {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mOauthRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, subredditName, postType, sortType,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             }
         } else if(postType == PostDataSource.TYPE_MULTI_REDDIT) {
             multiRedditPath = getArguments().getString(EXTRA_NAME);
@@ -529,12 +531,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
             if (accessToken == null) {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mRetrofit, null,
-                        accountName, getResources().getConfiguration().locale, cache, multiRedditPath, postType, sortType,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, multiRedditPath, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             } else {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mOauthRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, multiRedditPath, postType, sortType,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, multiRedditPath, postType, sortType, filter, nsfw)).get(PostViewModel.class);
             }
         } else if (postType == PostDataSource.TYPE_USER) {
             username = getArguments().getString(EXTRA_USER_NAME);
@@ -582,12 +584,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
             if (accessToken == null) {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, username, postType, sortType, where,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, username, postType, sortType, where, filter, nsfw)).get(PostViewModel.class);
             } else {
                 mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mOauthRetrofit, accessToken,
-                        accountName, getResources().getConfiguration().locale, cache, username, postType, sortType, where,
-                        filter, nsfw)).get(PostViewModel.class);
+                        accountName, getResources().getConfiguration().locale, mSharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, username, postType, sortType, where, filter, nsfw)).get(PostViewModel.class);
             }
         } else {
             String sort = mSortTypeSharedPreferences.getString(SharedPreferencesUtils.SORT_TYPE_BEST_POST, SortType.Type.BEST.name());
@@ -625,7 +627,8 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
             });
 
             mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mOauthRetrofit, accessToken,
-                    accountName, getResources().getConfiguration().locale, cache, postType, sortType, filter, nsfw)).get(PostViewModel.class);
+                    accountName, getResources().getConfiguration().locale, mSharedPreferences, postFeedScrolledPositionSharedPreferences,
+                    postType, sortType, filter, nsfw)).get(PostViewModel.class);
         }
 
         if (activity instanceof ActivityToolbarInterface) {
@@ -714,29 +717,29 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     }
 
     private void saveCache() {
-        if (isShown && mAdapter != null) {
+        if (savePostFeedScrolledPosition && isShown && mAdapter != null) {
             String key;
             Post currentPost = mAdapter.getItemByPosition(maxPosition);
             if (currentPost != null) {
-                String accountNameForCache = accountName == null ? CacheUtils.ANONYMOUS : accountName;
+                String accountNameForCache = accountName == null ? SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_ANONYMOUS : accountName;
                 String value = currentPost.getFullName();
                 switch (postType) {
                     case PostDataSource.TYPE_FRONT_PAGE:
-                        key = accountNameForCache + CacheUtils.FRONT_PAGE_BASE;
+                        key = accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_FRONT_PAGE_BASE;
                         break;
                     case PostDataSource.TYPE_SUBREDDIT:
-                        key = accountNameForCache + CacheUtils.SUBREDDIT_BASE + subredditName;
+                        key = accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_SUBREDDIT_BASE + subredditName;
                         break;
                     case PostDataSource.TYPE_USER:
-                        key = accountNameForCache + CacheUtils.USER_BASE + username;
+                        key = accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_USER_BASE + username;
                         break;
                     case PostDataSource.TYPE_MULTI_REDDIT:
-                        key = accountNameForCache + CacheUtils.MULTI_REDDIT_BASE + multiRedditPath;
+                        key = accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_MULTI_REDDIT_BASE + multiRedditPath;
                         break;
                     default:
                         return;
                 }
-                cache.set(key, value);
+                postFeedScrolledPositionSharedPreferences.edit().putString(key, value).apply();
             }
         }
     }
@@ -1042,6 +1045,11 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
         }
     }
 
+    @Subscribe
+    public void onChangeSavePostFeedScrolledPositionEvent(ChangeSavePostFeedScrolledPositionEvent changeSavePostFeedScrolledPositionEvent) {
+        savePostFeedScrolledPosition = changeSavePostFeedScrolledPositionEvent.savePostFeedScrolledPosition;
+    }
+
     private void refreshAdapter() {
         int previousPosition = -1;
         if (mLinearLayoutManager != null) {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSource.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSource.java
index e886d731..5ef80d0c 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSource.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSource.java
@@ -1,11 +1,11 @@
 package ml.docilealligator.infinityforreddit.Post;
 
+import android.content.SharedPreferences;
+
 import androidx.annotation.NonNull;
 import androidx.lifecycle.MutableLiveData;
 import androidx.paging.PageKeyedDataSource;
 
-import com.fewlaps.quitnowcache.QNCache;
-
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -15,7 +15,7 @@ import ml.docilealligator.infinityforreddit.API.RedditAPI;
 import ml.docilealligator.infinityforreddit.NetworkState;
 import ml.docilealligator.infinityforreddit.SortType;
 import ml.docilealligator.infinityforreddit.Utils.APIUtils;
-import ml.docilealligator.infinityforreddit.Utils.CacheUtils;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Retrofit;
@@ -39,7 +39,8 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
     private String accessToken;
     private String accountName;
     private Locale locale;
-    private QNCache<String> cache;
+    private SharedPreferences sharedPreferences;
+    private SharedPreferences postFeedScrolledPositionSharedPreferences;
     private String subredditOrUserName;
     private String query;
     private int postType;
@@ -57,13 +58,15 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
     private LoadParams<String> params;
     private LoadCallback<String, Post> callback;
 
-    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                   int postType, SortType sortType, int filter, boolean nsfw) {
+    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                   SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, int postType,
+                   SortType sortType, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         paginationNetworkStateLiveData = new MutableLiveData<>();
         initialLoadStateLiveData = new MutableLiveData<>();
         hasPostLiveData = new MutableLiveData<>();
@@ -74,13 +77,15 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
-    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                   String path, int postType, SortType sortType, int filter, boolean nsfw) {
+    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                   SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String path, int postType,
+                   SortType sortType, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         if (postType == TYPE_SUBREDDIT) {
             this.subredditOrUserName = path;
         } else {
@@ -112,14 +117,15 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
-    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                   String subredditOrUserName, int postType, SortType sortType, String where, int filter,
-                   boolean nsfw) {
+    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                   SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String subredditOrUserName,
+                   int postType, SortType sortType, String where, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         this.subredditOrUserName = subredditOrUserName;
         paginationNetworkStateLiveData = new MutableLiveData<>();
         initialLoadStateLiveData = new MutableLiveData<>();
@@ -132,14 +138,15 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
-    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                   String subredditOrUserName, String query, int postType, SortType sortType, int filter,
-                   boolean nsfw) {
+    PostDataSource(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                   SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String subredditOrUserName,
+                   String query, int postType, SortType sortType, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         this.subredditOrUserName = subredditOrUserName;
         this.query = query;
         paginationNetworkStateLiveData = new MutableLiveData<>();
@@ -168,22 +175,39 @@ public class PostDataSource extends PageKeyedDataSource<String, Post> {
     public void loadInitial(@NonNull LoadInitialParams<String> params, @NonNull final LoadInitialCallback<String, Post> callback) {
         initialLoadStateLiveData.postValue(NetworkState.LOADING);
 
-        String accountNameForCache = accountName == null ? CacheUtils.ANONYMOUS : accountName;
+        boolean savePostFeedScrolledPosition = sharedPreferences.getBoolean(SharedPreferencesUtils.SAVE_POST_FEED_SCROLLED_POSITION, true);
+        String accountNameForCache = accountName == null ? SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_ANONYMOUS : accountName;
         switch (postType) {
             case TYPE_FRONT_PAGE:
-                loadBestPostsInitial(callback, cache.get(accountNameForCache + CacheUtils.FRONT_PAGE_BASE));
+                if (savePostFeedScrolledPosition) {
+                    loadBestPostsInitial(callback, postFeedScrolledPositionSharedPreferences.getString(accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_FRONT_PAGE_BASE, null));
+                } else {
+                    loadBestPostsInitial(callback, null);
+                }
                 break;
             case TYPE_SUBREDDIT:
-                loadSubredditPostsInitial(callback, cache.get(accountNameForCache + CacheUtils.SUBREDDIT_BASE + subredditOrUserName));
+                if (savePostFeedScrolledPosition) {
+                    loadSubredditPostsInitial(callback, postFeedScrolledPositionSharedPreferences.getString(accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_SUBREDDIT_BASE + subredditOrUserName, null));
+                } else {
+                    loadSubredditPostsInitial(callback, null);
+                }
                 break;
             case TYPE_USER:
-                loadUserPostsInitial(callback, cache.get(accountNameForCache + CacheUtils.USER_BASE + subredditOrUserName));
+                if (savePostFeedScrolledPosition) {
+                    loadUserPostsInitial(callback, postFeedScrolledPositionSharedPreferences.getString(accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_USER_BASE + subredditOrUserName, null));
+                } else {
+                    loadUserPostsInitial(callback, null);
+                }
                 break;
             case TYPE_SEARCH:
                 loadSearchPostsInitial(callback, null);
                 break;
             case TYPE_MULTI_REDDIT:
-                loadMultiRedditPostsInitial(callback, cache.get(accountNameForCache + CacheUtils.MULTI_REDDIT_BASE + multiRedditPath));
+                if (savePostFeedScrolledPosition) {
+                    loadMultiRedditPostsInitial(callback, postFeedScrolledPositionSharedPreferences.getString(accountNameForCache + SharedPreferencesUtils.POST_FEED_SCROLLED_POSITION_MULTI_REDDIT_BASE + multiRedditPath, null));
+                } else {
+                    loadMultiRedditPostsInitial(callback, null);
+                }
                 break;
         }
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSourceFactory.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSourceFactory.java
index 6ed8a51c..39c4d6b1 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSourceFactory.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostDataSourceFactory.java
@@ -1,11 +1,11 @@
 package ml.docilealligator.infinityforreddit.Post;
 
+import android.content.SharedPreferences;
+
 import androidx.annotation.NonNull;
 import androidx.lifecycle.MutableLiveData;
 import androidx.paging.DataSource;
 
-import com.fewlaps.quitnowcache.QNCache;
-
 import java.util.Locale;
 
 import ml.docilealligator.infinityforreddit.SortType;
@@ -16,7 +16,8 @@ class PostDataSourceFactory extends DataSource.Factory {
     private String accessToken;
     private String accountName;
     private Locale locale;
-    private QNCache<String> cache;
+    private SharedPreferences sharedPreferences;
+    private SharedPreferences postFeedScrolledPositionSharedPreferences;
     private String subredditName;
     private String query;
     private int postType;
@@ -28,13 +29,15 @@ class PostDataSourceFactory extends DataSource.Factory {
     private PostDataSource postDataSource;
     private MutableLiveData<PostDataSource> postDataSourceLiveData;
 
-    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
+    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                           int postType, SortType sortType, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         postDataSourceLiveData = new MutableLiveData<>();
         this.postType = postType;
         this.sortType = sortType;
@@ -42,13 +45,15 @@ class PostDataSourceFactory extends DataSource.Factory {
         this.nsfw = nsfw;
     }
 
-    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
+    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                           String subredditName, int postType, SortType sortType, int filter, boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         this.subredditName = subredditName;
         postDataSourceLiveData = new MutableLiveData<>();
         this.postType = postType;
@@ -57,14 +62,16 @@ class PostDataSourceFactory extends DataSource.Factory {
         this.nsfw = nsfw;
     }
 
-    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
+    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                           String subredditName, int postType, SortType sortType, String where, int filter,
                           boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         this.subredditName = subredditName;
         postDataSourceLiveData = new MutableLiveData<>();
         this.postType = postType;
@@ -74,14 +81,16 @@ class PostDataSourceFactory extends DataSource.Factory {
         this.nsfw = nsfw;
     }
 
-    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
+    PostDataSourceFactory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                           String subredditName, String query, int postType, SortType sortType, int filter,
                           boolean nsfw) {
         this.retrofit = retrofit;
         this.accessToken = accessToken;
         this.accountName = accountName;
         this.locale = locale;
-        this.cache = cache;
+        this.sharedPreferences = sharedPreferences;
+        this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
         this.subredditName = subredditName;
         this.query = query;
         postDataSourceLiveData = new MutableLiveData<>();
@@ -95,17 +104,17 @@ class PostDataSourceFactory extends DataSource.Factory {
     @Override
     public DataSource<String, Post> create() {
         if (postType == PostDataSource.TYPE_FRONT_PAGE) {
-            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale, cache,
-                    postType, sortType, filter, nsfw);
+            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale,
+                    sharedPreferences, postFeedScrolledPositionSharedPreferences, postType, sortType, filter, nsfw);
         } else if (postType == PostDataSource.TYPE_SEARCH) {
-            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale, cache,
-                    subredditName, query, postType, sortType, filter, nsfw);
+            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale,
+                    sharedPreferences, postFeedScrolledPositionSharedPreferences, subredditName, query, postType, sortType, filter, nsfw);
         } else if (postType == PostDataSource.TYPE_SUBREDDIT || postType == PostDataSource.TYPE_MULTI_REDDIT) {
-            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale, cache,
-                    subredditName, postType, sortType, filter, nsfw);
+            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale,
+                    sharedPreferences, postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, filter, nsfw);
         } else {
-            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale, cache,
-                    subredditName, postType, sortType, userWhere, filter, nsfw);
+            postDataSource = new PostDataSource(retrofit, accessToken, accountName, locale,
+                    sharedPreferences, postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, userWhere, filter, nsfw);
         }
 
         postDataSourceLiveData.postValue(postDataSource);
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostViewModel.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostViewModel.java
index 3da11f53..c141aa8a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostViewModel.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Post/PostViewModel.java
@@ -1,5 +1,7 @@
 package ml.docilealligator.infinityforreddit.Post;
 
+import android.content.SharedPreferences;
+
 import androidx.annotation.NonNull;
 import androidx.core.util.Pair;
 import androidx.lifecycle.LiveData;
@@ -11,8 +13,6 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.paging.LivePagedListBuilder;
 import androidx.paging.PagedList;
 
-import com.fewlaps.quitnowcache.QNCache;
-
 import java.util.Locale;
 
 import ml.docilealligator.infinityforreddit.NetworkState;
@@ -29,10 +29,11 @@ public class PostViewModel extends ViewModel {
     private MutableLiveData<SortType> sortTypeLiveData;
     private NSFWAndSortTypeLiveData nsfwAndSortTypeLiveData;
 
-    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                         int postType, SortType sortType, int filter, boolean nsfw) {
-        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale, cache,
-                postType, sortType, filter, nsfw);
+    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                         SharedPreferences sharedPreferences, SharedPreferences cache, int postType,
+                         SortType sortType, int filter, boolean nsfw) {
+        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale,
+                sharedPreferences, cache, postType, sortType, filter, nsfw);
 
         initialLoadingState = Transformations.switchMap(postDataSourceFactory.getPostDataSourceLiveData(),
                 PostDataSource::getInitialLoadStateLiveData);
@@ -60,10 +61,11 @@ public class PostViewModel extends ViewModel {
         });
     }
 
-    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                         String subredditName, int postType, SortType sortType, int filter, boolean nsfw) {
-        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale, cache,
-                subredditName, postType, sortType, filter, nsfw);
+    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                         SharedPreferences sharedPreferences, SharedPreferences cache, String subredditName,
+                         int postType, SortType sortType, int filter, boolean nsfw) {
+        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale,
+                sharedPreferences, cache, subredditName, postType, sortType, filter, nsfw);
 
         initialLoadingState = Transformations.switchMap(postDataSourceFactory.getPostDataSourceLiveData(),
                 PostDataSource::getInitialLoadStateLiveData);
@@ -91,11 +93,12 @@ public class PostViewModel extends ViewModel {
         });
     }
 
-    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                         String subredditName, int postType, SortType sortType, String where, int filter,
+    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                         SharedPreferences sharedPreferences, SharedPreferences cache, String subredditName,
+                         int postType, SortType sortType, String where, int filter,
                          boolean nsfw) {
-        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale, cache,
-                subredditName, postType, sortType, where, filter, nsfw);
+        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale,
+                sharedPreferences, cache, subredditName, postType, sortType, where, filter, nsfw);
 
         initialLoadingState = Transformations.switchMap(postDataSourceFactory.getPostDataSourceLiveData(),
                 PostDataSource::getInitialLoadStateLiveData);
@@ -123,11 +126,12 @@ public class PostViewModel extends ViewModel {
         });
     }
 
-    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                         String subredditName, String query, int postType, SortType sortType, int filter,
+    public PostViewModel(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                         SharedPreferences sharedPreferences, SharedPreferences cache, String subredditName,
+                         String query, int postType, SortType sortType, int filter,
                          boolean nsfw) {
-        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale, cache,
-                subredditName, query, postType, sortType, filter, nsfw);
+        postDataSourceFactory = new PostDataSourceFactory(retrofit, accessToken, accountName, locale,
+                sharedPreferences, cache, subredditName, query, postType, sortType, filter, nsfw);
 
         initialLoadingState = Transformations.switchMap(postDataSourceFactory.getPostDataSourceLiveData(),
                 PostDataSource::getInitialLoadStateLiveData);
@@ -192,7 +196,8 @@ public class PostViewModel extends ViewModel {
         private String accessToken;
         private String accountName;
         private Locale locale;
-        private QNCache<String> cache;
+        private SharedPreferences sharedPreferences;
+        private SharedPreferences postFeedScrolledPositionSharedPreferences;
         private String subredditName;
         private String query;
         private int postType;
@@ -201,26 +206,30 @@ public class PostViewModel extends ViewModel {
         private int filter;
         private boolean nsfw;
 
-        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
+        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                       SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        int postType, SortType sortType, int filter, boolean nsfw) {
             this.retrofit = retrofit;
             this.accessToken = accessToken;
             this.accountName = accountName;
             this.locale = locale;
-            this.cache = cache;
+            this.sharedPreferences = sharedPreferences;
+            this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
             this.postType = postType;
             this.sortType = sortType;
             this.filter = filter;
             this.nsfw = nsfw;
         }
 
-        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                       String subredditName, int postType, SortType sortType, int filter, boolean nsfw) {
+        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                       SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String subredditName,
+                       int postType, SortType sortType, int filter, boolean nsfw) {
             this.retrofit = retrofit;
             this.accessToken = accessToken;
             this.accountName = accountName;
             this.locale = locale;
-            this.cache = cache;
+            this.sharedPreferences = sharedPreferences;
+            this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
             this.subredditName = subredditName;
             this.postType = postType;
             this.sortType = sortType;
@@ -229,14 +238,16 @@ public class PostViewModel extends ViewModel {
         }
 
         //User posts
-        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                       String subredditName, int postType, SortType sortType, String where, int filter,
+        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                       SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String subredditName,
+                       int postType, SortType sortType, String where, int filter,
                        boolean nsfw) {
             this.retrofit = retrofit;
             this.accessToken = accessToken;
             this.accountName = accountName;
             this.locale = locale;
-            this.cache = cache;
+            this.sharedPreferences = sharedPreferences;
+            this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
             this.subredditName = subredditName;
             this.postType = postType;
             this.sortType = sortType;
@@ -245,14 +256,15 @@ public class PostViewModel extends ViewModel {
             this.nsfw = nsfw;
         }
 
-        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale, QNCache<String> cache,
-                       String subredditName, String query, int postType, SortType sortType, int filter,
-                       boolean nsfw) {
+        public Factory(Retrofit retrofit, String accessToken, String accountName, Locale locale,
+                       SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences, String subredditName,
+                       String query, int postType, SortType sortType, int filter, boolean nsfw) {
             this.retrofit = retrofit;
             this.accessToken = accessToken;
             this.accountName = accountName;
             this.locale = locale;
-            this.cache = cache;
+            this.sharedPreferences = sharedPreferences;
+            this.postFeedScrolledPositionSharedPreferences = postFeedScrolledPositionSharedPreferences;
             this.subredditName = subredditName;
             this.query = query;
             this.postType = postType;
@@ -265,17 +277,17 @@ public class PostViewModel extends ViewModel {
         @Override
         public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
             if (postType == PostDataSource.TYPE_FRONT_PAGE) {
-                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, cache, postType,
-                        sortType, filter, nsfw);
+                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, sharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, postType, sortType, filter, nsfw);
             } else if (postType == PostDataSource.TYPE_SEARCH) {
-                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, cache, subredditName,
-                        query, postType, sortType, filter, nsfw);
+                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, sharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, query, postType, sortType, filter, nsfw);
             } else if (postType == PostDataSource.TYPE_SUBREDDIT || postType == PostDataSource.TYPE_MULTI_REDDIT) {
-                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, cache, subredditName,
-                        postType, sortType, filter, nsfw);
+                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, sharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, filter, nsfw);
             } else {
-                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, cache, subredditName,
-                        postType, sortType, userWhere, filter, nsfw);
+                return (T) new PostViewModel(retrofit, accessToken, accountName, locale, sharedPreferences,
+                        postFeedScrolledPositionSharedPreferences, subredditName, postType, sortType, userWhere, filter, nsfw);
             }
         }
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Settings/MainPreferenceFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Settings/MainPreferenceFragment.java
index aa1b77d0..65384fbd 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Settings/MainPreferenceFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Settings/MainPreferenceFragment.java
@@ -17,6 +17,7 @@ import javax.inject.Named;
 
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWBlurEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWEvent;
+import ml.docilealligator.infinityforreddit.Event.ChangeSavePostFeedScrolledPositionEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeSpoilerBlurEvent;
 import ml.docilealligator.infinityforreddit.Event.RecreateActivityEvent;
 import ml.docilealligator.infinityforreddit.Infinity;
@@ -28,6 +29,9 @@ public class MainPreferenceFragment extends PreferenceFragmentCompat {
     @Inject
     @Named("default")
     SharedPreferences sharedPreferences;
+    @Inject
+    @Named("post_feed_scrolled_position_cache")
+    SharedPreferences cache;
     private Activity activity;
 
     @Override
@@ -35,11 +39,22 @@ public class MainPreferenceFragment extends PreferenceFragmentCompat {
         setPreferencesFromResource(R.xml.main_preferences, rootKey);
         ((Infinity) activity.getApplication()).getAppComponent().inject(this);
 
+        SwitchPreference savePostFeedScrolledPositionSwitch = findPreference(SharedPreferencesUtils.SAVE_POST_FEED_SCROLLED_POSITION);
         SwitchPreference confirmToExitSwitch = findPreference(SharedPreferencesUtils.CONFIRM_TO_EXIT);
         SwitchPreference nsfwSwitch = findPreference(SharedPreferencesUtils.NSFW_KEY);
         SwitchPreference blurNSFWSwitch = findPreference(SharedPreferencesUtils.BLUR_NSFW_KEY);
         SwitchPreference blurSpoilerSwitch = findPreference(SharedPreferencesUtils.BLUR_SPOILER_KEY);
 
+        if (savePostFeedScrolledPositionSwitch != null) {
+            savePostFeedScrolledPositionSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
+                if (!(Boolean) newValue) {
+                    cache.edit().clear().apply();
+                }
+                EventBus.getDefault().post(new ChangeSavePostFeedScrolledPositionEvent((Boolean) newValue));
+                return true;
+            });
+        }
+
         if (confirmToExitSwitch != null) {
             confirmToExitSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
                 EventBus.getDefault().post(new RecreateActivityEvent());
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/CacheUtils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/CacheUtils.java
deleted file mode 100644
index e0280204..00000000
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/CacheUtils.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package ml.docilealligator.infinityforreddit.Utils;
-
-public class CacheUtils {
-    public static final String FRONT_PAGE_BASE = "_front_page";
-    public static final String SUBREDDIT_BASE = "_subreddit_";
-    public static final String USER_BASE = "_user_";
-    public static final String MULTI_REDDIT_BASE = "_multireddit_";
-    public static final String ANONYMOUS = ".anonymous";
-}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/SharedPreferencesUtils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/SharedPreferencesUtils.java
index 768db21a..783ab80c 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/SharedPreferencesUtils.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Utils/SharedPreferencesUtils.java
@@ -73,6 +73,13 @@ public class SharedPreferencesUtils {
     public static final int POST_LAYOUT_CARD = 0;
     public static final int POST_LAYOUT_COMPACT = 1;
 
+    public static final String POST_FEED_SCROLLED_POSITION_SHARED_PREFERENCES_FILE = "ml.docilealligator.infinityforreddit.post_feed_scrolled_position";
+    public static final String POST_FEED_SCROLLED_POSITION_FRONT_PAGE_BASE = "_front_page";
+    public static final String POST_FEED_SCROLLED_POSITION_SUBREDDIT_BASE = "_subreddit_";
+    public static final String POST_FEED_SCROLLED_POSITION_USER_BASE = "_user_";
+    public static final String POST_FEED_SCROLLED_POSITION_MULTI_REDDIT_BASE = "_multireddit_";
+    public static final String POST_FEED_SCROLLED_POSITION_ANONYMOUS = ".anonymous";
+
     public static final String PULL_NOTIFICATION_TIME = "pull_notification_time";
     public static final String SHOW_ELAPSED_TIME_KEY = "show_elapsed_time";
     public static final String TIME_FORMAT_KEY = "time_format";
@@ -132,4 +139,5 @@ public class SharedPreferencesUtils {
     public static final String START_AUTOPLAY_VISIBLE_AREA_OFFSET_LANDSCAPE = "start_autoplay_visible_area_offset_landscape";
     public static final String MUTE_NSFW_VIDEO = "mute_nsfw_video";
     public static final String VIDEO_PLAYER_IGNORE_NAV_BAR = "video_player_ignore_nav_bar";
+    public static final String SAVE_POST_FEED_SCROLLED_POSITION = "save_post_feed_scrolled_position";
 }