Swipe between gallery images in PostFragment.

app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountPostsActivity.java

@@ -13,6 +13,7 @@ import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 
 import com.r0adkll.slidr.Slidr;
+import com.r0adkll.slidr.model.SlidrInterface;
 
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
@@ -53,6 +54,7 @@ public class AccountPostsActivity extends BaseActivity implements SortTypeSelect
     SharedPreferences mCurrentAccountSharedPreferences;
     @Inject
     CustomThemeWrapper mCustomThemeWrapper;
+    private SlidrInterface mSlidrInterface;
     private String mAccessToken;
     private String mAccountName;
     private String mUserWhere;
@@ -74,7 +76,7 @@ public class AccountPostsActivity extends BaseActivity implements SortTypeSelect
         applyCustomTheme();
 
         if (mSharedPreferences.getBoolean(SharedPreferencesUtils.SWIPE_RIGHT_TO_GO_BACK, true)) {
-            Slidr.attach(this);
+            mSlidrInterface = Slidr.attach(this);
         }
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
@@ -239,4 +241,18 @@ public class AccountPostsActivity extends BaseActivity implements SortTypeSelect
             ((PostFragment) mFragment).goBackToTop();
         }
     }
+
+    @Override
+    public void lockSwipeRightToGoBack() {
+        if (mSlidrInterface != null) {
+            mSlidrInterface.lock();
+        }
+    }
+
+    @Override
+    public void unlockSwipeRightToGoBack() {
+        if (mSlidrInterface != null) {
+            mSlidrInterface.unlock();
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountSavedThingActivity.java

@@ -229,12 +229,14 @@ public class AccountSavedThingActivity extends BaseActivity implements ActivityT
         }
     }
 
+    @Override
     public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
+    @Override
     public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();

app/src/main/java/ml/docilealligator/infinityforreddit/activities/BaseActivity.java

@@ -391,4 +391,13 @@ public abstract class BaseActivity extends AppCompatActivity implements CustomFo
         this.titleTypeface = titleTypeface;
         this.contentTypeface = contentTypeface;
     }
+
+
+    public void lockSwipeRightToGoBack() {
+
+    }
+
+    public void unlockSwipeRightToGoBack() {
+
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/FullMarkdownActivity.java

@@ -41,12 +41,11 @@ import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.events.SwitchAccountEvent;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
-import ml.docilealligator.infinityforreddit.utils.Utils;
 
 public class FullMarkdownActivity extends BaseActivity {
 
@@ -145,7 +144,7 @@ public class FullMarkdownActivity extends BaseActivity {
                 miscPlugin, markdownColor, spoilerBackgroundColor, null);
 
         MarkwonAdapter markwonAdapter = MarkdownUtils.createTablesAdapter();
-        LinearLayoutManagerBugFixed linearLayoutManager = new MarkwonLinearLayoutManager(this, new SwipeLockScrollView.SwipeLockInterface() {
+        LinearLayoutManagerBugFixed linearLayoutManager = new SwipeLockLinearLayoutManager(this, new SwipeLockInterface() {
             @Override
             public void lockSwipe() {
                 if (mSlidrInterface != null) {

app/src/main/java/ml/docilealligator/infinityforreddit/activities/HistoryActivity.java

@@ -227,12 +227,14 @@ public class HistoryActivity extends BaseActivity implements ActivityToolbarInte
         }
     }
 
+    @Override
     public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
+    @Override
     public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();

app/src/main/java/ml/docilealligator/infinityforreddit/activities/InboxActivity.java

@@ -393,13 +393,15 @@ public class InboxActivity extends BaseActivity implements ActivityToolbarInterf
         }
     }
 
-    private void lockSwipeRightToGoBack() {
+    @Override
+    public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
-    private void unlockSwipeRightToGoBack() {
+    @Override
+    public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();
         }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/SearchResultActivity.java

@@ -913,13 +913,15 @@ public class SearchResultActivity extends BaseActivity implements SortTypeSelect
         }
     }
 
-    private void lockSwipeRightToGoBack() {
+    @Override
+    public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
-    private void unlockSwipeRightToGoBack() {
+    @Override
+    public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();
         }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/SubscribedThingListingActivity.java

@@ -449,13 +449,15 @@ public class SubscribedThingListingActivity extends BaseActivity implements Acti
         }
     }
 
-    private void lockSwipeRightToGoBack() {
+    @Override
+    public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
-    private void unlockSwipeRightToGoBack() {
+    @Override
+    public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();
         }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPostDetailActivity.java

@@ -916,12 +916,14 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
         }
     }
 
+    @Override
     public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
+    @Override
     public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();

app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewRedditGalleryActivity.java

@@ -60,6 +60,7 @@ public class ViewRedditGalleryActivity extends AppCompatActivity implements SetA
     public static final String EXTRA_REDDIT_GALLERY = "ERG";
     public static final String EXTRA_SUBREDDIT_NAME = "ESN";
     public static final String EXTRA_IS_NSFW = "EIN";
+    public static final String EXTRA_GALLERY_ITEM_INDEX = "EGII";
 
     @BindView(R.id.hauler_view_view_reddit_gallery_activity)
     HaulerView haulerView;

app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewSubredditDetailActivity.java

@@ -1547,13 +1547,15 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
         InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, mAccountName, post.getId());
     }
 
-    private void lockSwipeRightToGoBack() {
+    @Override
+    public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
-    private void unlockSwipeRightToGoBack() {
+    @Override
+    public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();
         }

app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewUserDetailActivity.java

@@ -1748,12 +1748,14 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
         }
     }
 
+    @Override
     public void lockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.lock();
         }
     }
 
+    @Override
     public void unlockSwipeRightToGoBack() {
         if (mSlidrInterface != null) {
             mSlidrInterface.unlock();

app/src/main/java/ml/docilealligator/infinityforreddit/activities/WikiActivity.java

@@ -50,8 +50,8 @@ import ml.docilealligator.infinityforreddit.apis.RedditAPI;
 import ml.docilealligator.infinityforreddit.bottomsheetfragments.UrlMenuBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.events.SwitchAccountEvent;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
 import ml.docilealligator.infinityforreddit.utils.JSONUtils;
@@ -178,7 +178,7 @@ public class WikiActivity extends BaseActivity {
                 miscPlugin, markdownColor, spoilerBackgroundColor, onLinkLongClickListener);
 
         markwonAdapter = MarkdownUtils.createTablesAdapter();
-        LinearLayoutManagerBugFixed linearLayoutManager = new MarkwonLinearLayoutManager(this, new SwipeLockScrollView.SwipeLockInterface() {
+        LinearLayoutManagerBugFixed linearLayoutManager = new SwipeLockLinearLayoutManager(this, new SwipeLockInterface() {
             @Override
             public void lockSwipe() {
                 if (mSlidrInterface != null) {

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/CommentsListingRecyclerViewAdapter.java

@@ -53,9 +53,9 @@ import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.CommentIndentationView;
 import ml.docilealligator.infinityforreddit.customviews.CustomMarkwonAdapter;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.customviews.SpoilerOnClickTextView;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
 import ml.docilealligator.infinityforreddit.utils.APIUtils;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
@@ -502,7 +502,7 @@ public class CommentsListingRecyclerViewAdapter extends PagedListAdapter<Comment
             });
 
             commentMarkdownView.setRecycledViewPool(recycledViewPool);
-            LinearLayoutManagerBugFixed linearLayoutManager = new MarkwonLinearLayoutManager(mActivity, new SwipeLockScrollView.SwipeLockInterface() {
+            LinearLayoutManagerBugFixed linearLayoutManager = new SwipeLockLinearLayoutManager(mActivity, new SwipeLockInterface() {
                 @Override
                 public void lockSwipe() {
                     if (mActivity instanceof AccountSavedThingActivity) {

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/CommentsRecyclerViewAdapter.java

@@ -62,9 +62,9 @@ import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.CommentIndentationView;
 import ml.docilealligator.infinityforreddit.customviews.CustomMarkwonAdapter;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.customviews.SpoilerOnClickTextView;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.fragments.ViewPostDetailFragment;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
 import ml.docilealligator.infinityforreddit.post.Post;
@@ -1268,7 +1268,7 @@ public class CommentsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerVi
             }
 
             commentMarkdownView.setRecycledViewPool(recycledViewPool);
-            LinearLayoutManagerBugFixed linearLayoutManager = new MarkwonLinearLayoutManager(mActivity, new SwipeLockScrollView.SwipeLockInterface() {
+            LinearLayoutManagerBugFixed linearLayoutManager = new SwipeLockLinearLayoutManager(mActivity, new SwipeLockInterface() {
                 @Override
                 public void lockSwipe() {
                     ((ViewPostDetailActivity) mActivity).lockSwipeRightToGoBack();

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostDetailRecyclerViewAdapter.java

@@ -89,8 +89,8 @@ import ml.docilealligator.infinityforreddit.bottomsheetfragments.ShareLinkBottom
 import ml.docilealligator.infinityforreddit.bottomsheetfragments.UrlMenuBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.AspectRatioGifImageView;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
 import ml.docilealligator.infinityforreddit.fragments.ViewPostDetailFragment;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
 import ml.docilealligator.infinityforreddit.post.Post;
@@ -1191,7 +1191,7 @@ public class PostDetailRecyclerViewAdapter extends RecyclerView.Adapter<Recycler
                 mActivity.startActivity(intent);
             });
 
-            mContentMarkdownView.setLayoutManager(new MarkwonLinearLayoutManager(mActivity, new SwipeLockScrollView.SwipeLockInterface() {
+            mContentMarkdownView.setLayoutManager(new SwipeLockLinearLayoutManager(mActivity, new SwipeLockInterface() {
                 @Override
                 public void lockSwipe() {
                     ((ViewPostDetailActivity) mActivity).lockSwipeRightToGoBack();

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostGalleryTypeImageRecyclerViewAdapter.java

@@ -0,0 +1,155 @@
+package ml.docilealligator.infinityforreddit.adapters;
+
+import android.content.res.ColorStateList;
+import android.graphics.Typeface;
+import android.graphics.drawable.Drawable;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.bumptech.glide.RequestBuilder;
+import com.bumptech.glide.RequestManager;
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.engine.GlideException;
+import com.bumptech.glide.request.RequestListener;
+import com.bumptech.glide.request.RequestOptions;
+import com.bumptech.glide.request.target.Target;
+
+import java.util.ArrayList;
+
+import jp.wasabeef.glide.transformations.BlurTransformation;
+import ml.docilealligator.infinityforreddit.SaveMemoryCenterInisdeDownsampleStrategy;
+import ml.docilealligator.infinityforreddit.databinding.ItemGalleryImageInPostFeedBinding;
+import ml.docilealligator.infinityforreddit.post.Post;
+
+public class PostGalleryTypeImageRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+    private RequestManager glide;
+    private Typeface typeface;
+    private SaveMemoryCenterInisdeDownsampleStrategy saveMemoryCenterInisdeDownsampleStrategy;
+    private int mColorAccent;
+    private int mPrimaryTextColor;
+    private float mScale;
+    private ArrayList<Post.Gallery> galleryImages;
+    private boolean blurImage;
+    private float ratio;
+    private OnItemClickListener onItemClickListener;
+
+    public PostGalleryTypeImageRecyclerViewAdapter(RequestManager glide, Typeface typeface,
+                                                   SaveMemoryCenterInisdeDownsampleStrategy saveMemoryCenterInisdeDownsampleStrategy,
+                                                   int mColorAccent, int mPrimaryTextColor, float scale,
+                                                   OnItemClickListener onItemClickListener) {
+        this.glide = glide;
+        this.typeface = typeface;
+        this.saveMemoryCenterInisdeDownsampleStrategy = saveMemoryCenterInisdeDownsampleStrategy;
+        this.mColorAccent = mColorAccent;
+        this.mPrimaryTextColor = mPrimaryTextColor;
+        this.mScale = scale;
+        this.onItemClickListener = onItemClickListener;
+    }
+
+    @NonNull
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        return new ImageViewHolder(ItemGalleryImageInPostFeedBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
+        if (holder instanceof ImageViewHolder) {
+            if (ratio < 0) {
+                int height = (int) (400 * mScale);
+                ((ImageViewHolder) holder).binding.imageViewItemGalleryImageInPostFeed.setScaleType(ImageView.ScaleType.CENTER_CROP);
+                ((ImageViewHolder) holder).binding.imageViewItemGalleryImageInPostFeed.getLayoutParams().height = height;
+            } else {
+                ((ImageViewHolder) holder).binding.imageViewItemGalleryImageInPostFeed.setRatio(ratio);
+            }
+            ((ImageViewHolder) holder).binding.errorTextViewItemGalleryImageInPostFeed.setVisibility(View.GONE);
+            ((ImageViewHolder) holder).binding.progressBarItemGalleryImageInPostFeed.setVisibility(View.VISIBLE);
+            loadImage((ImageViewHolder) holder);
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return galleryImages == null ? 0 : galleryImages.size();
+    }
+
+    @Override
+    public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
+        super.onViewRecycled(holder);
+    }
+
+    private void loadImage(ImageViewHolder holder) {
+        holder.binding.imageViewItemGalleryImageInPostFeed.setRatio(ratio);
+        RequestBuilder<Drawable> imageRequestBuilder = glide.load(galleryImages.get(holder.getBindingAdapterPosition()).url).listener(new RequestListener<>() {
+            @Override
+            public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
+                holder.binding.progressBarItemGalleryImageInPostFeed.setVisibility(View.GONE);
+                holder.binding.errorTextViewItemGalleryImageInPostFeed.setVisibility(View.VISIBLE);
+                return false;
+            }
+
+            @Override
+            public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
+                holder.binding.errorTextViewItemGalleryImageInPostFeed.setVisibility(View.GONE);
+                holder.binding.progressBarItemGalleryImageInPostFeed.setVisibility(View.GONE);
+                return false;
+            }
+        });
+        if (blurImage) {
+            imageRequestBuilder.apply(RequestOptions.bitmapTransform(new BlurTransformation(50, 10)))
+                    .into(holder.binding.imageViewItemGalleryImageInPostFeed);
+        } else {
+            imageRequestBuilder.centerInside().downsample(saveMemoryCenterInisdeDownsampleStrategy).into(holder.binding.imageViewItemGalleryImageInPostFeed);
+        }
+    }
+
+    public void setGalleryImages(ArrayList<Post.Gallery> galleryImages) {
+        this.galleryImages = galleryImages;
+        notifyDataSetChanged();
+    }
+
+    public void setBlurImage(boolean blurImage) {
+        this.blurImage = blurImage;
+    }
+
+    public void setRatio(float ratio) {
+        this.ratio = ratio;
+    }
+
+    class ImageViewHolder extends RecyclerView.ViewHolder {
+
+        ItemGalleryImageInPostFeedBinding binding;
+
+        public ImageViewHolder(ItemGalleryImageInPostFeedBinding binding) {
+            super(binding.getRoot());
+
+            this.binding = binding;
+
+            if (typeface != null) {
+                binding.errorTextViewItemGalleryImageInPostFeed.setTypeface(typeface);
+            }
+            binding.progressBarItemGalleryImageInPostFeed.setIndeterminateTintList(ColorStateList.valueOf(mColorAccent));
+            binding.errorTextViewItemGalleryImageInPostFeed.setTextColor(mPrimaryTextColor);
+
+            binding.imageViewItemGalleryImageInPostFeed.setOnClickListener(view -> {
+                onItemClickListener.onClick(getBindingAdapterPosition());
+            });
+
+            binding.errorTextViewItemGalleryImageInPostFeed.setOnClickListener(view -> {
+                binding.progressBarItemGalleryImageInPostFeed.setVisibility(View.VISIBLE);
+                binding.errorTextViewItemGalleryImageInPostFeed.setVisibility(View.GONE);
+                loadImage(this);
+            });
+        }
+    }
+
+    public interface OnItemClickListener {
+        void onClick(int galleryItemIndex);
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostRecyclerViewAdapter.java

@@ -11,7 +11,9 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
+import android.util.Log;
 import android.view.LayoutInflater;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
@@ -32,6 +34,8 @@ import androidx.core.content.ContextCompat;
 import androidx.paging.PagingDataAdapter;
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.ItemTouchHelper;
+import androidx.recyclerview.widget.LinearSnapHelper;
+import androidx.recyclerview.widget.PagerSnapHelper;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.bumptech.glide.Glide;
@@ -81,6 +85,9 @@ import ml.docilealligator.infinityforreddit.apis.StreamableAPI;
 import ml.docilealligator.infinityforreddit.bottomsheetfragments.ShareLinkBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.AspectRatioGifImageView;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
+import ml.docilealligator.infinityforreddit.databinding.ItemPostGalleryTypeBinding;
 import ml.docilealligator.infinityforreddit.events.PostUpdateEventToPostDetailFragment;
 import ml.docilealligator.infinityforreddit.fragments.PostFragment;
 import ml.docilealligator.infinityforreddit.post.Post;
@@ -107,12 +114,13 @@ import retrofit2.Retrofit;
 public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerView.ViewHolder> implements CacheManager {
     private static final int VIEW_TYPE_POST_CARD_VIDEO_AUTOPLAY_TYPE = 1;
     private static final int VIEW_TYPE_POST_CARD_WITH_PREVIEW_TYPE = 2;
-    private static final int VIEW_TYPE_POST_CARD_TEXT_TYPE = 3;
+    private static final int VIEW_TYPE_POST_CARD_GALLERY_TYPE = 3;
-    private static final int VIEW_TYPE_POST_COMPACT = 4;
+    private static final int VIEW_TYPE_POST_CARD_TEXT_TYPE = 4;
-    private static final int VIEW_TYPE_POST_GALLERY = 5;
+    private static final int VIEW_TYPE_POST_COMPACT = 5;
-    private static final int VIEW_TYPE_POST_CARD_2_VIDEO_AUTOPLAY_TYPE = 6;
+    private static final int VIEW_TYPE_POST_GALLERY = 6;
-    private static final int VIEW_TYPE_POST_CARD_2_WITH_PREVIEW_TYPE = 7;
+    private static final int VIEW_TYPE_POST_CARD_2_VIDEO_AUTOPLAY_TYPE = 7;
-    private static final int VIEW_TYPE_POST_CARD_2_TEXT_TYPE = 8;
+    private static final int VIEW_TYPE_POST_CARD_2_WITH_PREVIEW_TYPE = 8;
+    private static final int VIEW_TYPE_POST_CARD_2_TEXT_TYPE = 9;
 
     private static final DiffUtil.ItemCallback<Post> DIFF_CALLBACK = new DiffUtil.ItemCallback<Post>() {
         @Override
@@ -217,6 +225,7 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
     private ExoCreator mExoCreator;
     private Callback mCallback;
     private boolean canPlayVideo = true;
+    private RecyclerView.RecycledViewPool mGalleryRecycledViewPool;
 
     public PostRecyclerViewAdapter(BaseActivity activity, PostFragment fragment, Executor executor, Retrofit oauthRetrofit,
                                    Retrofit gfycatRetrofit, Retrofit redgifsRetrofit, Retrofit streambleRetrofit,
@@ -345,6 +354,8 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
             mLocale = locale;
             mExoCreator = exoCreator;
             mCallback = callback;
+
+            mGalleryRecycledViewPool = new RecyclerView.RecycledViewPool();
         }
     }
 
@@ -368,8 +379,9 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                         return VIEW_TYPE_POST_CARD_WITH_PREVIEW_TYPE;
                     case Post.GIF_TYPE:
                     case Post.IMAGE_TYPE:
-                    case Post.GALLERY_TYPE:
                         return VIEW_TYPE_POST_CARD_WITH_PREVIEW_TYPE;
+                    case Post.GALLERY_TYPE:
+                        return VIEW_TYPE_POST_CARD_GALLERY_TYPE;
                     case Post.LINK_TYPE:
                     case Post.NO_PREVIEW_LINK_TYPE:
                         switch (mDefaultLinkPostLayout) {
@@ -448,6 +460,8 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
             return new PostVideoAutoplayViewHolder(LayoutInflater.from(parent.getContext()).inflate(mLegacyAutoplayVideoControllerUI ? R.layout.item_post_video_type_autoplay_legacy_controller : R.layout.item_post_video_type_autoplay, parent, false));
         } else if (viewType == VIEW_TYPE_POST_CARD_WITH_PREVIEW_TYPE) {
             return new PostWithPreviewTypeViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_post_with_preview, parent, false));
+        } else if (viewType == VIEW_TYPE_POST_CARD_GALLERY_TYPE) {
+            return new PostGalleryTypeViewHolder(ItemPostGalleryTypeBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
         } else if (viewType == VIEW_TYPE_POST_CARD_TEXT_TYPE) {
             return new PostTextTypeViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_post_text, parent, false));
         } else if (viewType == VIEW_TYPE_POST_COMPACT) {
@@ -781,10 +795,6 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                             ((PostWithPreviewTypeViewHolder) holder).noPreviewLinkImageView.setVisibility(View.VISIBLE);
                             ((PostWithPreviewTypeViewHolder) holder).noPreviewLinkImageView.setImageResource(R.drawable.ic_link);
                         }
-                    } else if (post.getPostType() == Post.GALLERY_TYPE) {
-                        ((PostWithPreviewTypeViewHolder) holder).typeTextView.setText(mActivity.getString(R.string.gallery));
-                        ((PostWithPreviewTypeViewHolder) holder).videoOrGifIndicatorImageView.setVisibility(View.VISIBLE);
-                        ((PostWithPreviewTypeViewHolder) holder).videoOrGifIndicatorImageView.setImageDrawable(ContextCompat.getDrawable(mActivity, R.drawable.ic_gallery_24dp));
                     }
 
                     if (post.getPostType() != Post.NO_PREVIEW_LINK_TYPE) {
@@ -801,8 +811,6 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                             ((PostWithPreviewTypeViewHolder) holder).videoOrGifIndicatorImageView.setVisibility(View.GONE);
                         } else if (post.getPostType() == Post.LINK_TYPE) {
                             ((PostWithPreviewTypeViewHolder) holder).noPreviewLinkImageView.setImageResource(R.drawable.ic_link);
-                        } else if (post.getPostType() == Post.GALLERY_TYPE) {
-                            ((PostWithPreviewTypeViewHolder) holder).noPreviewLinkImageView.setImageResource(R.drawable.ic_gallery_24dp);
                         }
                     } else if (mDataSavingMode && mOnlyDisablePreviewInVideoAndGifPosts && (post.getPostType() == Post.VIDEO_TYPE || post.getPostType() == Post.GIF_TYPE)) {
                         ((PostWithPreviewTypeViewHolder) holder).noPreviewLinkImageView.setVisibility(View.VISIBLE);
@@ -850,6 +858,26 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                             }
                         }
                     }
+                } else if (holder instanceof PostGalleryTypeViewHolder) {
+                    if (mDataSavingMode && mDisableImagePreview) {
+                        ((PostGalleryTypeViewHolder) holder).binding.noPreviewImageViewItemPostGalleryType.setVisibility(View.VISIBLE);
+                        ((PostGalleryTypeViewHolder) holder).binding.noPreviewImageViewItemPostGalleryType.setImageResource(R.drawable.ic_gallery_24dp);
+                    } else {
+                        ((PostGalleryTypeViewHolder) holder).binding.galleryRecyclerViewItemPostGalleryType.setVisibility(View.VISIBLE);
+                        Post.Preview preview = getSuitablePreview(post.getPreviews());
+                        if (preview != null) {
+                            if (mFixedHeightPreviewInCard || (preview.getPreviewWidth() <= 0 || preview.getPreviewHeight() <= 0)) {
+                                ((PostGalleryTypeViewHolder) holder).adapter.setRatio(-1);
+                            } else {
+                                ((PostGalleryTypeViewHolder) holder).adapter.setRatio((float) preview.getPreviewHeight() / preview.getPreviewWidth());
+                            }
+                        } else {
+                            ((PostGalleryTypeViewHolder) holder).adapter.setRatio(-1);
+                        }
+                        ((PostGalleryTypeViewHolder) holder).adapter.setGalleryImages(post.getGallery());
+                        ((PostGalleryTypeViewHolder) holder).adapter.setBlurImage(
+                                (post.isNSFW() && mNeedBlurNsfw && !(mDoNotBlurNsfwInNsfwSubreddits && mFragment != null && mFragment.getIsNsfwSubreddit())) || (post.isSpoiler() && mNeedBlurSpoiler));
+                    }
                 } else if (holder instanceof PostTextTypeViewHolder) {
                     if (!mHideTextPostContent && !post.isSpoiler() && post.getSelfTextPlainTrimmed() != null && !post.getSelfTextPlainTrimmed().equals("")) {
                         ((PostTextTypeViewHolder) holder).contentTextView.setVisibility(View.VISIBLE);
@@ -1861,6 +1889,9 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                 ((PostWithPreviewTypeViewHolder) holder).progressBar.setVisibility(View.GONE);
                 ((PostWithPreviewTypeViewHolder) holder).videoOrGifIndicatorImageView.setVisibility(View.GONE);
                 ((PostWithPreviewTypeViewHolder) holder).linkTextView.setVisibility(View.GONE);
+            } else if (holder instanceof PostGalleryTypeViewHolder) {
+                ((PostGalleryTypeViewHolder) holder).binding.galleryRecyclerViewItemPostGalleryType.setVisibility(View.GONE);
+                ((PostGalleryTypeViewHolder) holder).binding.noPreviewImageViewItemPostGalleryType.setVisibility(View.GONE);
             } else if (holder instanceof PostTextTypeViewHolder) {
                 ((PostTextTypeViewHolder) holder).contentTextView.setText("");
                 ((PostTextTypeViewHolder) holder).contentTextView.setTextColor(mPostContentColor);
@@ -2032,6 +2063,10 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
     }
 
     private void openMedia(Post post) {
+        openMedia(post, 0);
+    }
+
+    private void openMedia(Post post, int galleryItemIndex) {
         if (canStartActivity) {
             canStartActivity = false;
             if (post.getPostType() == Post.VIDEO_TYPE) {
@@ -2086,6 +2121,7 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
                 intent.putParcelableArrayListExtra(ViewRedditGalleryActivity.EXTRA_REDDIT_GALLERY, post.getGallery());
                 intent.putExtra(ViewRedditGalleryActivity.EXTRA_SUBREDDIT_NAME, post.getSubredditName());
                 intent.putExtra(ViewRedditGalleryActivity.EXTRA_IS_NSFW, post.isNSFW());
+                intent.putExtra(ViewRedditGalleryActivity.EXTRA_GALLERY_ITEM_INDEX, galleryItemIndex);
                 mActivity.startActivity(intent);
             }
         }
@@ -3067,6 +3103,100 @@ public class PostRecyclerViewAdapter extends PagingDataAdapter<Post, RecyclerVie
         }
     }
 
+    public class PostGalleryTypeViewHolder extends PostBaseViewHolder {
+        ItemPostGalleryTypeBinding binding;
+        PostGalleryTypeImageRecyclerViewAdapter adapter;
+        private boolean swipeLocked;
+
+        PostGalleryTypeViewHolder(ItemPostGalleryTypeBinding binding) {
+            super(binding.getRoot());
+            this.binding = binding;
+            setBaseView(
+                    binding.iconGifImageViewItemPostGalleryType,
+                    binding.subredditNameTextViewItemPostGalleryType,
+                    binding.userTextViewItemPostGalleryType,
+                    binding.stickiedPostImageViewItemPostGalleryType,
+                    binding.postTimeTextViewItemPostGalleryType,
+                    binding.titleTextViewItemPostGalleryType,
+                    binding.typeTextViewItemPostGalleryType,
+                    binding.archivedImageViewItemPostGalleryType,
+                    binding.lockedImageViewItemPostGalleryType,
+                    binding.crosspostImageViewItemPostGalleryType,
+                    binding.nsfwTextViewItemPostGalleryType,
+                    binding.spoilerTextViewItemPostGalleryType,
+                    binding.flairTextViewItemPostGalleryType,
+                    binding.awardsTextViewItemPostGalleryType,
+                    binding.bottomConstraintLayoutItemPostGalleryType,
+                    binding.upvoteButtonItemPostGalleryType,
+                    binding.scoreTextViewItemPostGalleryType,
+                    binding.downvoteButtonItemPostGalleryType,
+                    binding.commentsCountTextViewItemPostGalleryType,
+                    binding.saveButtonItemPostGalleryType,
+                    binding.shareButtonItemPostGalleryType);
+
+            adapter = new PostGalleryTypeImageRecyclerViewAdapter(mGlide, mActivity.typeface,
+                    mSaveMemoryCenterInsideDownsampleStrategy, mColorAccent, mPrimaryTextColor, mScale,
+                    galleryItemIndex -> {
+                        int position = getBindingAdapterPosition();
+                        if (position < 0) {
+                            return;
+                        }
+                        if (post != null) {
+                            markPostRead(post, true);
+                            openMedia(post, galleryItemIndex);
+                        }
+                    });
+            binding.galleryRecyclerViewItemPostGalleryType.setAdapter(adapter);
+            new PagerSnapHelper().attachToRecyclerView(binding.galleryRecyclerViewItemPostGalleryType);
+            binding.galleryRecyclerViewItemPostGalleryType.setRecycledViewPool(mGalleryRecycledViewPool);
+            binding.galleryRecyclerViewItemPostGalleryType.setLayoutManager(new SwipeLockLinearLayoutManager(
+                    mActivity, RecyclerView.HORIZONTAL, false, new SwipeLockInterface() {
+                @Override
+                public void lockSwipe() {
+                    mActivity.lockSwipeRightToGoBack();
+                    swipeLocked = true;
+                }
+
+                @Override
+                public void unlockSwipe() {
+                    mActivity.unlockSwipeRightToGoBack();
+                    swipeLocked = false;
+                }
+
+                @Override
+                public void setSwipeLocked(boolean swipeLocked) {
+                    PostGalleryTypeViewHolder.this.swipeLocked = swipeLocked;
+                }
+            }));
+            binding.getRoot().setOnTouchListener((view, motionEvent) -> {
+                swipeLocked = false;
+                return false;
+            });
+            binding.bottomConstraintLayoutItemPostGalleryType.setOnTouchListener(new View.OnTouchListener() {
+                @Override
+                public boolean onTouch(View view, MotionEvent motionEvent) {
+                    swipeLocked = false;
+                    return false;
+                }
+            });
+
+            binding.noPreviewImageViewItemPostGalleryType.setOnClickListener(view -> {
+                int position = getBindingAdapterPosition();
+                if (position < 0) {
+                    return;
+                }
+                if (post != null) {
+                    markPostRead(post, true);
+                    openMedia(post, 0);
+                }
+            });
+        }
+
+        public boolean isSwipeLocked() {
+            return swipeLocked;
+        }
+    }
+
     class PostTextTypeViewHolder extends PostBaseViewHolder {
         @BindView(R.id.icon_gif_image_view_item_post_text_type)
         AspectRatioGifImageView iconGifImageView;

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/RulesRecyclerViewAdapter.java

@@ -31,11 +31,9 @@ import ml.docilealligator.infinityforreddit.activities.BaseActivity;
 import ml.docilealligator.infinityforreddit.activities.LinkResolverActivity;
 import ml.docilealligator.infinityforreddit.bottomsheetfragments.UrlMenuBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
-import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockInterface;
-import ml.docilealligator.infinityforreddit.customviews.MarkwonLinearLayoutManager;
+import ml.docilealligator.infinityforreddit.customviews.SwipeLockLinearLayoutManager;
-import ml.docilealligator.infinityforreddit.customviews.SwipeLockScrollView;
 import ml.docilealligator.infinityforreddit.markdown.MarkdownUtils;
-import ml.docilealligator.infinityforreddit.utils.Utils;
 
 public class RulesRecyclerViewAdapter extends RecyclerView.Adapter<RulesRecyclerViewAdapter.RuleViewHolder> {
     private BaseActivity activity;
@@ -140,8 +138,8 @@ public class RulesRecyclerViewAdapter extends RecyclerView.Adapter<RulesRecycler
                 shortNameTextView.setTypeface(activity.typeface);
             }
             markwonAdapter = MarkdownUtils.createTablesAdapter();
-            LinearLayoutManagerBugFixed linearLayoutManager = new MarkwonLinearLayoutManager(activity,
+            SwipeLockLinearLayoutManager swipeLockLinearLayoutManager = new SwipeLockLinearLayoutManager(activity,
-                    new SwipeLockScrollView.SwipeLockInterface() {
+                    new SwipeLockInterface() {
                 @Override
                 public void lockSwipe() {
                     if (slidrInterface != null) {
@@ -156,7 +154,7 @@ public class RulesRecyclerViewAdapter extends RecyclerView.Adapter<RulesRecycler
                     }
                 }
             });
-            descriptionMarkwonView.setLayoutManager(linearLayoutManager);
+            descriptionMarkwonView.setLayoutManager(swipeLockLinearLayoutManager);
             descriptionMarkwonView.setAdapter(markwonAdapter);
         }
     }

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/MarkwonLinearLayoutManager.java

@@ -1,26 +0,0 @@
-package ml.docilealligator.infinityforreddit.customviews;
-
-import android.content.Context;
-import android.view.View;
-
-import androidx.annotation.Nullable;
-
-public class MarkwonLinearLayoutManager extends LinearLayoutManagerBugFixed {
-
-    @Nullable
-    private final SwipeLockScrollView.SwipeLockInterface swipeLockInterface;
-
-    public MarkwonLinearLayoutManager(Context context,
-                                      @Nullable SwipeLockScrollView.SwipeLockInterface swipeLockInterface) {
-        super(context);
-        this.swipeLockInterface = swipeLockInterface;
-    }
-
-    @Override
-    public void addView(View child) {
-        super.addView(child);
-        if (child instanceof SwipeLockScrollView) {
-            ((SwipeLockScrollView) child).setSwipeLockInterface(swipeLockInterface);
-        }
-    }
-}

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/SwipeLockFrameLayout.java

@@ -0,0 +1,76 @@
+package ml.docilealligator.infinityforreddit.customviews;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.widget.FrameLayout;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class SwipeLockFrameLayout extends FrameLayout implements SwipeLockView {
+    @Nullable
+    private SwipeLockInterface swipeLockInterface = null;
+    private boolean locked = false;
+
+    public SwipeLockFrameLayout(@NonNull Context context) {
+        super(context);
+    }
+
+    public SwipeLockFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public SwipeLockFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public SwipeLockFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @Override
+    public void setSwipeLockInterface(@Nullable SwipeLockInterface swipeLockInterface) {
+        this.swipeLockInterface = swipeLockInterface;
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent ev) {
+        updateSwipeLock(ev);
+        return true;
+    }
+
+    @SuppressLint("ClickableViewAccessibility") // we are just listening to touch events
+    @Override
+    public boolean onTouchEvent(MotionEvent ev) {
+        updateSwipeLock(ev);
+        return super.onTouchEvent(ev);
+    }
+
+    /**
+     * Unlocks swipe if the view cannot be scrolled right anymore or if {@code ev} is
+     * {@link MotionEvent#ACTION_UP} or {@link MotionEvent#ACTION_CANCEL}
+     */
+    private void updateSwipeLock(MotionEvent ev) {
+        if (swipeLockInterface != null) {
+            int action = ev.getAction();
+            if (action == MotionEvent.ACTION_UP ||
+                    action == MotionEvent.ACTION_CANCEL) {
+                // calling SlidrInterface#unlock aborts the swipe
+                // so don't call unlock if it is already unlocked
+                if (locked) {
+                    swipeLockInterface.unlockSwipe();
+                    locked = false;
+                }
+            } else {
+                if (!locked) {
+                    swipeLockInterface.lockSwipe();
+                    locked = true;
+                }
+            }
+
+            swipeLockInterface.setSwipeLocked(locked);
+        }
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/SwipeLockInterface.java

@@ -0,0 +1,7 @@
+package ml.docilealligator.infinityforreddit.customviews;
+
+public interface SwipeLockInterface {
+    void lockSwipe();
+    void unlockSwipe();
+    default void setSwipeLocked(boolean swipeLocked) {}
+}

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/SwipeLockLinearLayoutManager.java

@@ -0,0 +1,31 @@
+package ml.docilealligator.infinityforreddit.customviews;
+
+import android.content.Context;
+import android.view.View;
+
+import androidx.annotation.Nullable;
+
+public class SwipeLockLinearLayoutManager extends LinearLayoutManagerBugFixed {
+
+    @Nullable
+    private final SwipeLockInterface swipeLockInterface;
+
+    public SwipeLockLinearLayoutManager(Context context,
+                                        @Nullable SwipeLockInterface swipeLockInterface) {
+        super(context);
+        this.swipeLockInterface = swipeLockInterface;
+    }
+
+    public SwipeLockLinearLayoutManager(Context context, int orientation, boolean reverseLayout, @Nullable SwipeLockInterface swipeLockInterface) {
+        super(context, orientation, reverseLayout);
+        this.swipeLockInterface = swipeLockInterface;
+    }
+
+    @Override
+    public void addView(View child) {
+        super.addView(child);
+        if (child instanceof SwipeLockView) {
+            ((SwipeLockView) child).setSwipeLockInterface(swipeLockInterface);
+        }
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/SwipeLockScrollView.java

@@ -12,7 +12,7 @@ import androidx.annotation.Nullable;
  * if it can be scrolled to the right. {@link SwipeLockInterface} must be set for
  * locking to work.
  */
-public class SwipeLockScrollView extends HorizontalScrollView {
+public class SwipeLockScrollView extends HorizontalScrollView implements SwipeLockView {
     @Nullable
     private SwipeLockInterface swipeLockInterface = null;
     private boolean locked = false;
@@ -29,6 +29,7 @@ public class SwipeLockScrollView extends HorizontalScrollView {
         super(context, attrs, defStyleAttr);
     }
 
+    @Override
     public void setSwipeLockInterface(@Nullable SwipeLockInterface swipeLockInterface) {
         this.swipeLockInterface = swipeLockInterface;
     }
@@ -54,8 +55,7 @@ public class SwipeLockScrollView extends HorizontalScrollView {
         if (swipeLockInterface != null) {
             int action = ev.getAction();
             if (action == MotionEvent.ACTION_UP ||
-                    action == MotionEvent.ACTION_CANCEL ||
+                    action == MotionEvent.ACTION_CANCEL) {
-                    getScrollX() == 0) {
                 // calling SlidrInterface#unlock aborts the swipe
                 // so don't call unlock if it is already unlocked
                 if (locked) {
@@ -70,9 +70,4 @@ public class SwipeLockScrollView extends HorizontalScrollView {
             }
         }
     }
-
-    public interface SwipeLockInterface {
-        void lockSwipe();
-        void unlockSwipe();
-    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/customviews/SwipeLockView.java

@@ -0,0 +1,7 @@
+package ml.docilealligator.infinityforreddit.customviews;
+
+import androidx.annotation.Nullable;
+
+public interface SwipeLockView {
+    void setSwipeLockInterface(@Nullable SwipeLockInterface swipeLockInterface);
+}

app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java

@@ -1057,6 +1057,11 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
                 if (!(viewHolder instanceof PostRecyclerViewAdapter.PostBaseViewHolder) &&
                         !(viewHolder instanceof PostRecyclerViewAdapter.PostCompactBaseViewHolder)) {
                     return makeMovementFlags(0, 0);
+                } else if (viewHolder instanceof PostRecyclerViewAdapter.PostGalleryTypeViewHolder) {
+                    if (((PostRecyclerViewAdapter.PostGalleryTypeViewHolder) viewHolder).isSwipeLocked()) {
+                        return makeMovementFlags(0, 0);
+                    }
+
                 }
                 int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
                 return makeMovementFlags(0, swipeFlags);
@@ -1139,13 +1144,11 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
                         exceedThreshold = false;
                     }
                 }
-
-
             }
 
             @Override
             public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
-                return 100;
+                return 1;
             }
         });
 

app/src/main/java/ml/docilealligator/infinityforreddit/settings/CommentPreferenceFragment.java

@@ -3,7 +3,6 @@ package ml.docilealligator.infinityforreddit.settings;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 
-import androidx.preference.Preference;
 import androidx.preference.SeekBarPreference;
 
 import javax.inject.Inject;
@@ -31,7 +30,7 @@ public class CommentPreferenceFragment extends CustomFontPreferenceFragmentCompa
         if (showFewerToolbarOptionsThresholdSeekBarPreference != null) {
             showFewerToolbarOptionsThresholdSeekBarPreference.setSummary(getString(R.string.settings_show_fewer_toolbar_options_threshold_summary, sharedPreferences.getInt(SharedPreferencesUtils.SHOW_FEWER_TOOLBAR_OPTIONS_THRESHOLD, 5)));
 
-            showFewerToolbarOptionsThresholdSeekBarPreference.setOnPreferenceChangeListener((Preference.OnPreferenceChangeListener) (preference, newValue) -> {
+            showFewerToolbarOptionsThresholdSeekBarPreference.setOnPreferenceChangeListener((preference, newValue) -> {
                 showFewerToolbarOptionsThresholdSeekBarPreference.setSummary(
                         getString(R.string.settings_show_fewer_toolbar_options_threshold_summary, (Integer) newValue));
                 return true;

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

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ml.docilealligator.infinityforreddit.customviews.SwipeLockFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ml.docilealligator.infinityforreddit.customviews.AspectRatioGifImageView
+        android:id="@+id/image_view_item_gallery_image_in_post_feed"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:adjustViewBounds="true" />
+
+    <ProgressBar
+        android:id="@+id/progress_bar_item_gallery_image_in_post_feed"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center" />
+
+    <TextView
+        android:id="@+id/error_text_view_item_gallery_image_in_post_feed"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:drawableTop="@drawable/ic_error_outline_black_24dp"
+        android:layout_gravity="center"
+        android:gravity="center"
+        android:text="@string/error_loading_image_tap_to_retry"
+        android:textSize="?attr/font_default"
+        android:fontFamily="?attr/font_family"
+        android:visibility="gone" />
+
+</ml.docilealligator.infinityforreddit.customviews.SwipeLockFrameLayout>

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

@@ -0,0 +1,302 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_marginTop="8dp"
+    android:layout_marginBottom="8dp"
+    app:cardElevation="2dp"
+    app:cardCornerRadius="16dp"
+    style="?attr/materialCardViewElevatedStyle">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:padding="16dp">
+
+            <ml.docilealligator.infinityforreddit.customviews.AspectRatioGifImageView
+                android:id="@+id/icon_gif_image_view_item_post_gallery_type"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
+                android:layout_gravity="center"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent"/>
+
+            <TextView
+                android:id="@+id/subreddit_name_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:layout_marginStart="16dp"
+                android:layout_marginEnd="8dp"
+                android:textSize="?attr/font_default"
+                android:fontFamily="?attr/font_family"
+                app:layout_constraintBottom_toTopOf="@id/user_text_view_item_post_gallery_type"
+                app:layout_constraintStart_toEndOf="@id/icon_gif_image_view_item_post_gallery_type"
+                app:layout_constraintEnd_toStartOf="@id/stickied_post_image_view_item_post_gallery_type"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constrainedWidth="true"
+                app:layout_constraintHorizontal_bias="0"/>
+
+            <TextView
+                android:id="@+id/user_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="16dp"
+                android:layout_marginEnd="8dp"
+                android:textSize="?attr/font_default"
+                android:fontFamily="?attr/font_family"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/icon_gif_image_view_item_post_gallery_type"
+                app:layout_constraintEnd_toStartOf="@id/stickied_post_image_view_item_post_gallery_type"
+                app:layout_constraintTop_toBottomOf="@+id/subreddit_name_text_view_item_post_gallery_type"
+                app:layout_constraintHorizontal_bias="0"
+                app:layout_constrainedWidth="true" />
+
+            <ImageView
+                android:id="@+id/stickied_post_image_view_item_post_gallery_type"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
+                android:layout_marginEnd="8dp"
+                android:visibility="gone"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintEnd_toStartOf="@+id/guideline2"
+                app:layout_constraintTop_toTopOf="parent"
+                tools:visibility="visible" />
+
+            <TextView
+                android:id="@+id/post_time_text_view_item_post_gallery_type"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:gravity="end"
+                android:textSize="?attr/font_default"
+                android:fontFamily="?attr/font_family"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@id/guideline2"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <androidx.constraintlayout.widget.Guideline
+                android:id="@+id/guideline2"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                app:layout_constraintGuide_percent="0.6" />
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+        <TextView
+            android:id="@+id/title_text_view_item_post_gallery_type"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:textSize="?attr/title_font_18"
+            android:fontFamily="?attr/title_font_family" />
+
+        <com.nex3z.flowlayout.FlowLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:padding="16dp"
+            app:flChildSpacing="16dp"
+            app:flChildSpacingForLastRow="align"
+            app:flRowSpacing="8dp">
+
+            <com.libRG.CustomTextView
+                android:id="@+id/type_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="4dp"
+                android:text="@string/gallery"
+                android:textSize="?attr/font_12"
+                android:fontFamily="?attr/font_family"
+                app:lib_setRadius="6dp"
+                app:lib_setRoundedView="true"
+                app:lib_setShape="rectangle" />
+
+            <com.libRG.CustomTextView
+                android:id="@+id/spoiler_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/spoiler"
+                android:textSize="?attr/font_12"
+                android:fontFamily="?attr/font_family"
+                android:padding="4dp"
+                android:visibility="gone"
+                app:lib_setRadius="6dp"
+                app:lib_setRoundedView="true"
+                app:lib_setShape="rectangle" />
+
+            <com.libRG.CustomTextView
+                android:id="@+id/nsfw_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="4dp"
+                android:text="@string/nsfw"
+                android:textSize="?attr/font_12"
+                android:fontFamily="?attr/font_family"
+                android:visibility="gone"
+                app:lib_setRadius="6dp"
+                app:lib_setRoundedView="true"
+                app:lib_setShape="rectangle" />
+
+            <com.libRG.CustomTextView
+                android:id="@+id/flair_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:textSize="?attr/font_12"
+                android:fontFamily="?attr/font_family"
+                android:padding="4dp"
+                android:visibility="gone"
+                app:lib_setRadius="6dp"
+                app:lib_setRoundedView="true"
+                app:lib_setShape="rectangle" />
+
+            <com.libRG.CustomTextView
+                android:id="@+id/awards_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="4dp"
+                android:textSize="?attr/font_12"
+                android:fontFamily="?attr/font_family"
+                android:visibility="gone"
+                app:lib_setRadius="6dp"
+                app:lib_setRoundedView="true"
+                app:lib_setShape="rectangle" />
+
+            <ImageView
+                android:id="@+id/archived_image_view_item_post_gallery_type"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
+                android:src="@drawable/ic_archive_outline"
+                android:visibility="gone" />
+
+            <ImageView
+                android:id="@+id/locked_image_view_item_post_gallery_type"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
+                android:src="@drawable/ic_outline_lock_24dp"
+                android:visibility="gone" />
+
+            <ImageView
+                android:id="@+id/crosspost_image_view_item_post_gallery_type"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
+                android:src="@drawable/crosspost"
+                android:visibility="gone" />
+
+        </com.nex3z.flowlayout.FlowLayout>
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/gallery_recycler_view_item_post_gallery_type"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal" />
+
+        <ImageView
+            android:id="@+id/no_preview_image_view_item_post_gallery_type"
+            android:layout_width="match_parent"
+            android:layout_height="150dp"
+            android:src="@drawable/ic_gallery_24dp"
+            android:scaleType="center"
+            android:visibility="gone" />
+
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:id="@+id/bottom_constraint_layout_item_post_gallery_type"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <ImageView
+                android:id="@+id/upvote_button_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="12dp"
+                android:src="@drawable/ic_arrow_upward_grey_24dp"
+                android:background="?actionBarItemBackground"
+                android:clickable="true"
+                android:focusable="true"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent" />
+
+            <TextView
+                android:id="@+id/score_text_view_item_post_gallery_type"
+                android:layout_width="64dp"
+                android:layout_height="wrap_content"
+                android:gravity="center"
+                android:textSize="?attr/font_12"
+                android:textStyle="bold"
+                android:fontFamily="?attr/font_family"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@id/upvote_button_item_post_gallery_type" />
+
+            <ImageView
+                android:id="@+id/downvote_button_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="12dp"
+                android:src="@drawable/ic_arrow_downward_grey_24dp"
+                android:background="?actionBarItemBackground"
+                android:clickable="true"
+                android:focusable="true"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@id/score_text_view_item_post_gallery_type" />
+
+            <TextView
+                android:id="@+id/comments_count_text_view_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="12dp"
+                android:gravity="center_vertical"
+                android:textSize="?attr/font_12"
+                android:textStyle="bold"
+                android:fontFamily="?attr/font_family"
+                android:drawableStart="@drawable/ic_comment_grey_24dp"
+                android:drawablePadding="12dp"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@id/downvote_button_item_post_gallery_type" />
+
+            <ImageView
+                android:id="@+id/save_button_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="12dp"
+                android:background="?actionBarItemBackground"
+                android:clickable="true"
+                android:focusable="true"
+                app:layout_constraintHorizontal_bias="1"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@id/comments_count_text_view_item_post_gallery_type"
+                app:layout_constraintEnd_toStartOf="@id/share_button_item_post_gallery_type" />
+
+            <ImageView
+                android:id="@+id/share_button_item_post_gallery_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="12dp"
+                android:src="@drawable/ic_share_grey_24dp"
+                android:background="?actionBarItemBackground"
+                android:clickable="true"
+                android:focusable="true"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintEnd_toEndOf="parent" />
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+    </LinearLayout>
+
+</com.google.android.material.card.MaterialCardView>