Loading more comments in ViewPostDetailActivity is back. Display a progress bar when loading more comments. Display an error view when loading more comments failed.

app/src/main/java/ml/docilealligator/infinityforreddit/CommentRecyclerViewAdapter.java

@@ -10,6 +10,7 @@ import android.net.Uri;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
@@ -52,7 +53,9 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
     private static final int VIEW_TYPE_FIRST_LOADING_FAILED = 2;
     private static final int VIEW_TYPE_NO_COMMENT_PLACEHOLDER = 3;
     private static final int VIEW_TYPE_COMMENT = 4;
-    private static final int VIEW_TYPE_LOAD_MORE_COMMENT = 5;
+    private static final int VIEW_TYPE_LOAD_MORE_CHILD_COMMENTS = 5;
+    private static final int VIEW_TYPE_IS_LOADING_MORE_COMMENTS = 6;
+    private static final int VIEW_TYPE_LOAD_MORE_COMMENTS_FAILED = 7;
 
     private Activity mActivity;
     private Retrofit mRetrofit;
@@ -63,19 +66,22 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
     private ArrayList<CommentData> mVisibleComments;
     private String mSubredditNamePrefixed;
     private Locale mLocale;
-    private UpdatePostInPostFragmentCallback mUpdatePostInPostFragmentCallback;
+    private CommentRecyclerViewAdapterCallback mCommentRecyclerViewAdapterCallback;
     private LoadSubredditIconAsyncTask mLoadSubredditIconAsyncTask;
     private boolean isInitiallyLoading;
     private boolean isInitiallyLoadingFailed;
+    private boolean mHasMoreComments;
+    private boolean loadMoreCommentsFailed;
 
-    interface UpdatePostInPostFragmentCallback {
+    interface CommentRecyclerViewAdapterCallback {
         void updatePost(Post post);
+        void retryFetchingMoreComments();
     }
 
     CommentRecyclerViewAdapter(Activity activity, Retrofit retrofit, Retrofit oauthRetrofit, RequestManager glide,
                                SharedPreferences sharedPreferences, Post post, String subredditNamePrefixed,
                                Locale locale, LoadSubredditIconAsyncTask loadSubredditIconAsyncTask,
-                               UpdatePostInPostFragmentCallback updatePostInPostFragmentCallback) {
+                               CommentRecyclerViewAdapterCallback commentRecyclerViewAdapterCallback) {
         mActivity = activity;
         mRetrofit = retrofit;
         mOauthRetrofit = oauthRetrofit;
@@ -86,9 +92,11 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         mSubredditNamePrefixed = subredditNamePrefixed;
         mLocale = locale;
         mLoadSubredditIconAsyncTask = loadSubredditIconAsyncTask;
-        mUpdatePostInPostFragmentCallback = updatePostInPostFragmentCallback;
+        mCommentRecyclerViewAdapterCallback = commentRecyclerViewAdapterCallback;
         isInitiallyLoading = true;
         isInitiallyLoadingFailed = false;
+        mHasMoreComments = false;
+        loadMoreCommentsFailed = false;
     }
 
     @Override
@@ -109,29 +117,42 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             }
         }
 
+        if(position == mVisibleComments.size() + 1) {
+            if(mHasMoreComments) {
+                return VIEW_TYPE_IS_LOADING_MORE_COMMENTS;
+            } else {
+                return VIEW_TYPE_LOAD_MORE_COMMENTS_FAILED;
+            }
+        }
+
         CommentData comment = mVisibleComments.get(position - 1);
         if(!comment.isPlaceHolder()) {
             return VIEW_TYPE_COMMENT;
         } else {
-            return VIEW_TYPE_LOAD_MORE_COMMENT;
+            return VIEW_TYPE_LOAD_MORE_CHILD_COMMENTS;
         }
     }
 
     @NonNull
     @Override
     public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        if(viewType == VIEW_TYPE_POST_DETAIL) {
+        switch (viewType) {
-            return new PostDetailViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_post_detail, parent, false));
+            case VIEW_TYPE_POST_DETAIL:
-        } else if(viewType == VIEW_TYPE_FIRST_LOADING) {
+                return new PostDetailViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_post_detail, parent, false));
-            return new LoadCommentsViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_comments, parent, false));
+            case VIEW_TYPE_FIRST_LOADING:
-        } else if(viewType == VIEW_TYPE_FIRST_LOADING_FAILED) {
+                return new LoadCommentsViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_comments, parent, false));
-            return new LoadCommentsFailedViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_comments_failed_placeholder, parent, false));
+            case VIEW_TYPE_FIRST_LOADING_FAILED:
-        } else if(viewType == VIEW_TYPE_NO_COMMENT_PLACEHOLDER) {
+                return new LoadCommentsFailedViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_comments_failed_placeholder, parent, false));
-            return new NoCommentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_no_comment_placeholder, parent, false));
+            case VIEW_TYPE_NO_COMMENT_PLACEHOLDER:
-        } else if(viewType == VIEW_TYPE_COMMENT) {
+                return new NoCommentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_no_comment_placeholder, parent, false));
-            return new CommentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_comment, parent, false));
+            case VIEW_TYPE_COMMENT:
-        } else {
+                return new CommentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_comment, parent, false));
-            return new LoadMoreCommentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_more_comments_placeholder, parent, false));
+            case VIEW_TYPE_LOAD_MORE_CHILD_COMMENTS:
+                return new LoadMoreChildCommentsViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_load_more_comments_placeholder, parent, false));
+            case VIEW_TYPE_IS_LOADING_MORE_COMMENTS:
+                return new IsLoadingMoreCommentsViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_comment_footer_loading, parent, false));
+            default:
+                return new LoadMoreCommentsFailedViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_comment_footer_error, parent, false));
         }
     }
 
@@ -372,21 +393,23 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                             .setColorFilter(ContextCompat.getColor(mActivity, R.color.minusButtonColor), android.graphics.PorterDuff.Mode.SRC_IN);
                     break;
             }
-        } else if(holder instanceof LoadMoreCommentViewHolder) {
+        } else if(holder instanceof LoadMoreChildCommentsViewHolder) {
             CommentData placeholder;
             placeholder = mVisibleComments.get(holder.getAdapterPosition() - 1);
 
-            ViewGroup.LayoutParams params = ((LoadMoreCommentViewHolder) holder).verticalBlock.getLayoutParams();
+            ViewGroup.LayoutParams params = ((LoadMoreChildCommentsViewHolder) holder).verticalBlock.getLayoutParams();
             params.width = placeholder.getDepth() * 16;
-            ((LoadMoreCommentViewHolder) holder).verticalBlock.setLayoutParams(params);
+            ((LoadMoreChildCommentsViewHolder) holder).verticalBlock.setLayoutParams(params);
 
             if(placeholder.isLoadingMoreChildren()) {
-                ((LoadMoreCommentViewHolder) holder).placeholderTextView.setText(R.string.loading);
+                ((LoadMoreChildCommentsViewHolder) holder).placeholderTextView.setText(R.string.loading);
             } else if(placeholder.isLoadMoreChildrenFailed()) {
-                ((LoadMoreCommentViewHolder) holder).placeholderTextView.setText(R.string.comment_load_more_comments_failed);
+                ((LoadMoreChildCommentsViewHolder) holder).placeholderTextView.setText(R.string.comment_load_more_comments_failed);
             } else {
-                ((LoadMoreCommentViewHolder) holder).placeholderTextView.setText(R.string.comment_load_more_comments);
+                ((LoadMoreChildCommentsViewHolder) holder).placeholderTextView.setText(R.string.comment_load_more_comments);
             }
+        } else if(holder instanceof LoadMoreCommentsFailedViewHolder) {
+            ((LoadMoreCommentsFailedViewHolder) holder).errorTextView.setText(R.string.post_load_comments_failed);
         }
     }
 
@@ -488,7 +511,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         notifyItemRangeRemoved(position + 2, allChildrenSize);
     }
 
-    void addComments(ArrayList<CommentData> comments) {
+    void addComments(ArrayList<CommentData> comments, boolean hasMoreComments) {
         if(mVisibleComments.size() == 0) {
             isInitiallyLoading = false;
             isInitiallyLoadingFailed = false;
@@ -502,6 +525,15 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         int sizeBefore = mVisibleComments.size();
         mVisibleComments.addAll(comments);
         notifyItemRangeInserted(sizeBefore + 1, comments.size());
+
+        if(mHasMoreComments != hasMoreComments) {
+            if(hasMoreComments) {
+                notifyItemInserted(mVisibleComments.size() + 1);
+            } else {
+                notifyItemRemoved(mVisibleComments.size() + 1);
+            }
+        }
+        mHasMoreComments = hasMoreComments;
     }
 
     void addComment(CommentData comment) {
@@ -567,10 +599,17 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         notifyItemChanged(1);
     }
 
+    void loadMoreCommentsFailed() {
+        loadMoreCommentsFailed = true;
+        notifyItemChanged(mVisibleComments.size() + 1);
+    }
+
     @Override
     public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
         if (holder instanceof CommentViewHolder) {
             ((CommentViewHolder) holder).expandButton.setVisibility(View.GONE);
+            ((CommentViewHolder) holder).upvoteButton.clearColorFilter();
+            ((CommentViewHolder) holder).downvoteButton.clearColorFilter();
         }
     }
 
@@ -580,6 +619,10 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             return 2;
         }
 
+        if(mHasMoreComments || loadMoreCommentsFailed) {
+            return mVisibleComments.size() + 2;
+        }
+
         return mVisibleComments.size() + 1;
     }
 
@@ -607,7 +650,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         @BindView(R.id.minus_button_item_post_detail) ImageView mDownvoteButton;
         @BindView(R.id.share_button_item_post_detail) ImageView mShareButton;
 
-        public PostDetailViewHolder(@NonNull View itemView) {
+        PostDetailViewHolder(@NonNull View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);
 
@@ -648,7 +691,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
                 mScoreTextView.setText(Integer.toString(mPost.getScore() + mPost.getVoteType()));
 
-                mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                mCommentRecyclerViewAdapterCallback.updatePost(mPost);
 
                 VoteThing.voteThing(mOauthRetrofit, mSharedPreferences, new VoteThing.VoteThingWithoutPositionListener() {
                     @Override
@@ -664,7 +707,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                         mDownvoteButton.clearColorFilter();
                         mScoreTextView.setText(Integer.toString(mPost.getScore() + mPost.getVoteType()));
 
-                        mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                        mCommentRecyclerViewAdapterCallback.updatePost(mPost);
                     }
 
                     @Override
@@ -675,7 +718,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                         mUpvoteButton.setColorFilter(previousUpvoteButtonColorFilter);
                         mDownvoteButton.setColorFilter(previousDownvoteButtonColorFilter);
 
-                        mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                        mCommentRecyclerViewAdapterCallback.updatePost(mPost);
                     }
                 }, mPost.getFullName(), newVoteType);
             });
@@ -702,7 +745,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
                 mScoreTextView.setText(Integer.toString(mPost.getScore() + mPost.getVoteType()));
 
-                mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                mCommentRecyclerViewAdapterCallback.updatePost(mPost);
 
                 VoteThing.voteThing(mOauthRetrofit, mSharedPreferences, new VoteThing.VoteThingWithoutPositionListener() {
                     @Override
@@ -718,7 +761,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                         mUpvoteButton.clearColorFilter();
                         mScoreTextView.setText(Integer.toString(mPost.getScore() + mPost.getVoteType()));
 
-                        mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                        mCommentRecyclerViewAdapterCallback.updatePost(mPost);
                     }
 
                     @Override
@@ -729,7 +772,7 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                         mUpvoteButton.setColorFilter(previousUpvoteButtonColorFilter);
                         mDownvoteButton.setColorFilter(previousDownvoteButtonColorFilter);
 
-                        mUpdatePostInPostFragmentCallback.updatePost(mPost);
+                        mCommentRecyclerViewAdapterCallback.updatePost(mPost);
                     }
                 }, mPost.getFullName(), newVoteType);
             });
@@ -869,11 +912,11 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         }
     }
 
-    class LoadMoreCommentViewHolder extends RecyclerView.ViewHolder {
+    class LoadMoreChildCommentsViewHolder extends RecyclerView.ViewHolder {
         @BindView(R.id.vertical_block_item_load_more_comments) View verticalBlock;
         @BindView(R.id.placeholder_text_view_item_load_more_comments) TextView placeholderTextView;
 
-        LoadMoreCommentViewHolder(View itemView) {
+        LoadMoreChildCommentsViewHolder(View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);
 
@@ -1055,4 +1098,22 @@ class CommentRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             super(itemView);
         }
     }
+
+    class IsLoadingMoreCommentsViewHolder extends RecyclerView.ViewHolder {
+        IsLoadingMoreCommentsViewHolder(@NonNull View itemView) {
+            super(itemView);
+        }
+    }
+
+    class LoadMoreCommentsFailedViewHolder extends RecyclerView.ViewHolder {
+        @BindView(R.id.error_text_view_item_comment_footer_error) TextView errorTextView;
+        @BindView(R.id.retry_button_item_comment_footer_error) Button retryButton;
+
+        public LoadMoreCommentsFailedViewHolder(@NonNull View itemView) {
+            super(itemView);
+            ButterKnife.bind(this, itemView);
+
+            retryButton.setOnClickListener(view -> mCommentRecyclerViewAdapterCallback.retryFetchingMoreComments());
+        }
+    }
 }

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

@@ -608,9 +608,8 @@ class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView.ViewHo
     }
 
     class ErrorViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.relative_layout_footer_error_item) RelativeLayout relativeLayout;
+        @BindView(R.id.error_text_view_item_footer_error) TextView errorTextView;
-        @BindView(R.id.error_text_view_footer_error_item) TextView errorTextView;
+        @BindView(R.id.retry_button_item_footer_error) Button retryButton;
-        @BindView(R.id.retry_button_footer_error_item) Button retryButton;
 
         ErrorViewHolder(View itemView) {
             super(itemView);
@@ -621,8 +620,6 @@ class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView.ViewHo
     }
 
     class LoadingViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.progress_bar_footer_progress_bar_item) ProgressBar progressBar;
-
         LoadingViewHolder(@NonNull View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);

app/src/main/java/ml/docilealligator/infinityforreddit/SubredditListingRecyclerViewAdapter.java

@@ -8,22 +8,22 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ImageView;
-import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
+import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.paging.PagedListAdapter;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
 import com.bumptech.glide.request.RequestOptions;
 
 import SubredditDatabase.SubredditData;
 import SubscribedSubredditDatabase.SubscribedSubredditDao;
-import androidx.annotation.NonNull;
-import androidx.constraintlayout.widget.ConstraintLayout;
-import androidx.paging.PagedListAdapter;
-import androidx.recyclerview.widget.DiffUtil;
-import androidx.recyclerview.widget.RecyclerView;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
@@ -201,9 +201,8 @@ public class SubredditListingRecyclerViewAdapter extends PagedListAdapter<Subred
     }
 
     class ErrorViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.relative_layout_footer_error_item) RelativeLayout relativeLayout;
+        @BindView(R.id.error_text_view_item_footer_error) TextView errorTextView;
-        @BindView(R.id.error_text_view_footer_error_item) TextView errorTextView;
+        @BindView(R.id.retry_button_item_footer_error) Button retryButton;
-        @BindView(R.id.retry_button_footer_error_item) Button retryButton;
 
         ErrorViewHolder(View itemView) {
             super(itemView);
@@ -214,8 +213,6 @@ public class SubredditListingRecyclerViewAdapter extends PagedListAdapter<Subred
     }
 
     class LoadingViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.progress_bar_footer_progress_bar_item) ProgressBar progressBar;
-
         LoadingViewHolder(@NonNull View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);

app/src/main/java/ml/docilealligator/infinityforreddit/UserListingRecyclerViewAdapter.java

@@ -8,22 +8,22 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ImageView;
-import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
+import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.paging.PagedListAdapter;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
 import com.bumptech.glide.request.RequestOptions;
 
 import SubscribedUserDatabase.SubscribedUserDao;
 import User.UserData;
-import androidx.annotation.NonNull;
-import androidx.constraintlayout.widget.ConstraintLayout;
-import androidx.paging.PagedListAdapter;
-import androidx.recyclerview.widget.DiffUtil;
-import androidx.recyclerview.widget.RecyclerView;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
@@ -201,9 +201,8 @@ public class UserListingRecyclerViewAdapter extends PagedListAdapter<UserData, R
     }
 
     class ErrorViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.relative_layout_footer_error_item) RelativeLayout relativeLayout;
+        @BindView(R.id.error_text_view_item_footer_error) TextView errorTextView;
-        @BindView(R.id.error_text_view_footer_error_item) TextView errorTextView;
+        @BindView(R.id.retry_button_item_footer_error) Button retryButton;
-        @BindView(R.id.retry_button_footer_error_item) Button retryButton;
 
         ErrorViewHolder(View itemView) {
             super(itemView);
@@ -214,8 +213,6 @@ public class UserListingRecyclerViewAdapter extends PagedListAdapter<UserData, R
     }
 
     class LoadingViewHolder extends RecyclerView.ViewHolder {
-        @BindView(R.id.progress_bar_footer_progress_bar_item) ProgressBar progressBar;
-
         LoadingViewHolder(@NonNull View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);

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

@@ -57,7 +57,9 @@ public class ViewPostDetailActivity extends AppCompatActivity {
     private boolean isRefreshing = false;
     private ArrayList<String> children;
     private int mChildrenStartingIndex = 0;
+    private boolean loadMoreChildrenSuccess = true;
 
+    private LinearLayoutManager mLinearLayoutManager;
     private CommentRecyclerViewAdapter mAdapter;
     private LoadSubredditIconAsyncTask mLoadSubredditIconAsyncTask;
 
@@ -91,8 +93,8 @@ public class ViewPostDetailActivity extends AppCompatActivity {
         mGlide = Glide.with(this);
         mLocale = getResources().getConfiguration().locale;
 
-        mRecyclerView.setNestedScrollingEnabled(false);
+        mLinearLayoutManager = new LinearLayoutManager(this);
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
 
         if(savedInstanceState == null) {
             orientation = getResources().getConfiguration().orientation;
@@ -105,7 +107,20 @@ public class ViewPostDetailActivity extends AppCompatActivity {
         mAdapter = new CommentRecyclerViewAdapter(ViewPostDetailActivity.this, mRetrofit,
                 mOauthRetrofit, mGlide, mSharedPreferences, mPost,
                 mPost.getSubredditNamePrefixed(), mLocale, mLoadSubredditIconAsyncTask,
-                post -> EventBus.getDefault().post(new PostUpdateEventToPostList(mPost, postListPosition)));
+                new CommentRecyclerViewAdapter.CommentRecyclerViewAdapterCallback() {
+                    @Override
+                    public void updatePost(Post post) {
+                        EventBus.getDefault().post(new PostUpdateEventToPostList(mPost, postListPosition));
+                    }
+
+                    @Override
+                    public void retryFetchingMoreComments() {
+                        isLoadingMoreChildren = false;
+                        loadMoreChildrenSuccess = true;
+
+                        fetchMoreComments();
+                    }
+                });
         mRecyclerView.setAdapter(mAdapter);
 
         if(savedInstanceState != null) {
@@ -133,16 +148,26 @@ public class ViewPostDetailActivity extends AppCompatActivity {
                                                       String parentId, ArrayList<String> children) {
                         ViewPostDetailActivity.this.children = children;
 
-                        mAdapter.addComments(expandedComments);
+                        mAdapter.addComments(expandedComments, children.size() != 0);
 
-                        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
+                        if(children.size() > 0) {
-                            @Override
+                            mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
-                            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
+                                @Override
-                                super.onScrolled(recyclerView, dx, dy);
+                                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
+                                    super.onScrolled(recyclerView, dx, dy);
 
+                                    if(!isLoadingMoreChildren && loadMoreChildrenSuccess) {
+                                        int visibleItemCount = mLinearLayoutManager.getChildCount();
+                                        int totalItemCount = mLinearLayoutManager.getItemCount();
+                                        int firstVisibleItemPosition = mLinearLayoutManager.findFirstVisibleItemPosition();
 
-                            }
+                                        if ((visibleItemCount + firstVisibleItemPosition >= totalItemCount) && firstVisibleItemPosition >= 0) {
-                        });
+                                            fetchMoreComments();
+                                        }
+                                    }
+                                }
+                            });
+                        }
 
                         /*mCommentProgressbar.setVisibility(View.GONE);
 
@@ -154,7 +179,7 @@ public class ViewPostDetailActivity extends AppCompatActivity {
                                         int diff = view.getBottom() - (mNestedScrollView.getHeight() +
                                                 mNestedScrollView.getScrollY());
                                         if(diff == 0) {
-                                            fetchMoreComment(mChildrenStartingIndex);
+                                            fetchMoreComments(mChildrenStartingIndex);
                                         }
                                     }
                                 });
@@ -162,7 +187,7 @@ public class ViewPostDetailActivity extends AppCompatActivity {
 
                             mAdapter = new CommentRecyclerViewAdapter(ViewPostDetailActivity.this, mRetrofit,
                                     mOauthRetrofit, mGlide, mSharedPreferences, mPost,
-                                    mPost.getSubredditNamePrefixed(), mLocale, new CommentRecyclerViewAdapter.UpdatePostInPostFragmentCallback() {
+                                    mPost.getSubredditNamePrefixed(), mLocale, new CommentRecyclerViewAdapter.CommentRecyclerViewAdapterCallback() {
                                 @Override
                                 public void updatePost(Post post) {
                                     EventBus.getDefault().post(new PostUpdateEventToPostList(mPost, postListPosition));
@@ -184,27 +209,27 @@ public class ViewPostDetailActivity extends AppCompatActivity {
                 });
     }
 
-    private void fetchMoreComment(int startingIndex) {
+    void fetchMoreComments() {
-        if(isLoadingMoreChildren) {
+        if(isLoadingMoreChildren || !loadMoreChildrenSuccess) {
             return;
         }
 
         isLoadingMoreChildren = true;
-        FetchComment.fetchMoreComment(mRetrofit, mPost.getSubredditNamePrefixed(), children, startingIndex,
+        FetchComment.fetchMoreComment(mRetrofit, mPost.getSubredditNamePrefixed(), children, mChildrenStartingIndex,
                 0, mLocale, new FetchComment.FetchMoreCommentListener() {
                     @Override
                     public void onFetchMoreCommentSuccess(ArrayList<CommentData> expandedComments, int childrenStartingIndex) {
-                        mAdapter.addComments(expandedComments);
+                        mAdapter.addComments(expandedComments, childrenStartingIndex < children.size());
                         mChildrenStartingIndex = childrenStartingIndex;
                         isLoadingMoreChildren = false;
+                        loadMoreChildrenSuccess = true;
                     }
 
                     @Override
                     public void onFetchMoreCommentFailed() {
                         isLoadingMoreChildren = false;
-                        Snackbar snackbar = Snackbar.make(mCoordinatorLayout, R.string.post_load_more_comments_failed, Snackbar.LENGTH_INDEFINITE);
+                        loadMoreChildrenSuccess = false;
-                        snackbar.setAction(R.string.retry, view -> fetchMoreComment(startingIndex));
+                        mAdapter.loadMoreCommentsFailed();
-                        snackbar.show();
                     }
                 });
     }

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/relative_layout_item_comment_footer_error"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="16dp">
+
+    <TextView
+        android:id="@+id/error_text_view_item_comment_footer_error"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentStart="true"
+        android:layout_centerVertical="true"
+        android:layout_toStartOf="@id/retry_button_item_comment_footer_error"
+        android:textSize="18sp" />
+
+    <Button
+        android:id="@+id/retry_button_item_comment_footer_error"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:layout_centerVertical="true"
+        android:text="@string/retry" />
+
+</RelativeLayout>

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

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ProgressBar
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="16dp"
+        android:layout_centerHorizontal="true" />
+
+</RelativeLayout>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/relative_layout_footer_error_item"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginStart="16dp"
@@ -9,16 +8,16 @@
     android:layout_marginBottom="16dp">
 
     <TextView
-        android:id="@+id/error_text_view_footer_error_item"
+        android:id="@+id/error_text_view_item_footer_error"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentStart="true"
         android:layout_centerVertical="true"
-        android:layout_toStartOf="@id/retry_button_footer_error_item"
+        android:layout_toStartOf="@id/retry_button_item_footer_error"
         android:textSize="18sp" />
 
     <Button
-        android:id="@+id/retry_button_footer_error_item"
+        android:id="@+id/retry_button_item_footer_error"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentEnd="true"

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

@@ -5,7 +5,6 @@
     android:layout_height="wrap_content">
 
     <ProgressBar
-        android:id="@+id/progress_bar_footer_progress_bar_item"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="8dp"

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

@@ -28,7 +28,6 @@
 
     <string name="load_posts_failed">Error loading posts</string>
     <string name="post_load_comments_failed">Error loading comments</string>
-    <string name="post_load_more_comments_failed">Error loading more comments</string>
     <string name="retry">Retry</string>
     <string name="comments">Comments</string>
     <string name="no_comments_yet">No comments yet. Write a comment?</string>