app/src/main/java/io/lbry/browser/adapter/CommentListAdapter.java

@@ -0,0 +1,52 @@
+package io.lbry.browser.adapter;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import java.util.List;
+
+import androidx.recyclerview.widget.RecyclerView;
+import io.lbry.browser.R;
+import io.lbry.browser.model.Comment;
+
+public class CommentListAdapter extends RecyclerView.Adapter<CommentListAdapter.ViewHolder> {
+    private List<Comment> items;
+    private Context context;
+
+    public CommentListAdapter(List<Comment> items, Context context) {
+        this.items = items;
+        this.context = context;
+    }
+
+    @Override
+    public int getItemCount() {
+        return items != null ? items.size() : 0;
+    }
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        protected TextView channelName;
+        protected TextView commentText;
+
+        public ViewHolder (View v) {
+            super(v);
+            channelName = v.findViewById(R.id.comment_channel_name);
+            commentText = v.findViewById(R.id.comment_text);
+        }
+    }
+
+    @Override
+    public  ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View v = LayoutInflater.from(context).inflate(R.layout.list_item_comment, parent, false);
+        return new CommentListAdapter.ViewHolder(v);
+    }
+
+    @Override
+    public void onBindViewHolder(ViewHolder holder, int position) {
+        Comment comment = items.get(position);
+        holder.channelName.setText(comment.getChannelName());
+        holder.commentText.setText(comment.getText());
+    }
+}

app/src/main/java/io/lbry/browser/model/Comment.java

@@ -0,0 +1,40 @@
+package io.lbry.browser.model;
+
+import android.util.Log;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import lombok.Data;
+
+@Data
+public class Comment {
+    private final String channelName, text, id, parentId;
+
+    public Comment(String channelName, String text, String id, String parentId) {
+        this.channelName = channelName;
+        this.text = text;
+        this.id = id;
+        this.parentId = parentId;
+    }
+
+    public static Comment fromJSONObject(JSONObject jsonObject) {
+        try {
+            String parentId = null;
+            if (jsonObject.has("parent_id")) {
+                parentId = jsonObject.getString("parent_id");
+            }
+
+            return new Comment(
+                    jsonObject.getString("channel_name"),
+                    jsonObject.getString("comment"),
+                    jsonObject.getString("comment_id"),
+                    parentId
+            );
+        } catch (JSONException ex) {
+            // TODO: Throw exception
+            Log.e("Comments", ex.toString());
+            return null;
+        }
+    }
+}

app/src/main/java/io/lbry/browser/tasks/CommentListHandler.java

@@ -0,0 +1,10 @@
+package io.lbry.browser.tasks;
+
+import java.util.List;
+
+import io.lbry.browser.model.Comment;
+
+public interface CommentListHandler {
+    void onSuccess(List<Comment> comments);
+    void onError(Exception error);
+}

app/src/main/java/io/lbry/browser/tasks/CommentListTask.java

@@ -0,0 +1,77 @@
+package io.lbry.browser.tasks;
+
+import android.os.AsyncTask;
+import android.view.View;
+import android.widget.ProgressBar;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import io.lbry.browser.model.Comment;
+import io.lbry.browser.utils.Helper;
+import io.lbry.browser.utils.Lbry;
+
+public class CommentListTask extends AsyncTask<Void, Void, List<Comment>> {
+    private final int page;
+    private final int pageSize;
+    private final String claim;
+    private ProgressBar progressBar;
+    private CommentListHandler handler;
+    private Exception error;
+
+    public CommentListTask(int page, int pageSize, String claim, ProgressBar progressBar, CommentListHandler handler) {
+        this.page = page;
+        this.pageSize = pageSize;
+        this.claim = claim;
+        this.progressBar = progressBar;
+        this.handler = handler;
+    }
+
+    protected void onPreExecute() {
+        Helper.setViewVisibility(progressBar, View.VISIBLE);
+    }
+
+    protected List<Comment> doInBackground(Void... voids) {
+        List<Comment> comments = null;
+
+        try {
+            Map<String, Object> options = new HashMap<>();
+
+            options.put("claim_id", claim);
+            options.put("page", page);
+            options.put("page_size", pageSize);
+            options.put("include_replies", false);
+            options.put("is_channel_signature_valid", true);
+            options.put("visible", true);
+            options.put("hidden", false);
+
+            JSONObject result = (JSONObject) Lbry.genericApiCall(Lbry.METHOD_COMMENT_LIST, options);
+            JSONArray items = result.getJSONArray("items");
+            comments = new ArrayList<>();
+            for (int i = 0; i < items.length(); i++) {
+                comments.add(Comment.fromJSONObject(items.getJSONObject(i)));
+            }
+        } catch (Exception ex) {
+            error = ex;
+        }
+        return comments;
+    }
+
+    protected void onPostExecute(List<Comment> comments) {
+        Helper.setViewVisibility(progressBar, View.GONE);
+        if (handler != null) {
+            if (comments != null && error == null) {
+                handler.onSuccess(comments);
+            } else {
+                handler.onError(error);
+                if (error != null) {
+                }
+            }
+        }
+    }
+}

app/src/main/java/io/lbry/browser/ui/findcontent/FileViewFragment.java

@@ -91,6 +91,7 @@ import java.util.concurrent.TimeUnit;
 import io.lbry.browser.MainActivity;
 import io.lbry.browser.R;
 import io.lbry.browser.adapter.ClaimListAdapter;
+import io.lbry.browser.adapter.CommentListAdapter;
 import io.lbry.browser.adapter.TagListAdapter;
 import io.lbry.browser.dialog.RepostClaimDialogFragment;
 import io.lbry.browser.dialog.SendTipDialogFragment;
@@ -103,6 +104,7 @@ import io.lbry.browser.listener.StoragePermissionListener;
 import io.lbry.browser.listener.WalletBalanceListener;
 import io.lbry.browser.model.Claim;
 import io.lbry.browser.model.ClaimCacheKey;
+import io.lbry.browser.model.Comment;
 import io.lbry.browser.model.Fee;
 import io.lbry.browser.model.LbryFile;
 import io.lbry.browser.model.NavMenuItem;
@@ -111,6 +113,8 @@ import io.lbry.browser.model.UrlSuggestion;
 import io.lbry.browser.model.WalletBalance;
 import io.lbry.browser.model.lbryinc.Reward;
 import io.lbry.browser.model.lbryinc.Subscription;
+import io.lbry.browser.tasks.CommentListHandler;
+import io.lbry.browser.tasks.CommentListTask;
 import io.lbry.browser.tasks.GenericTaskHandler;
 import io.lbry.browser.tasks.LighthouseSearchTask;
 import io.lbry.browser.tasks.ReadTextFileTask;
@@ -163,6 +167,7 @@ public class FileViewFragment extends BaseFragment implements
     private Claim claim;
     private String currentUrl;
     private ClaimListAdapter relatedContentAdapter;
+    private CommentListAdapter commentListAdapter;
     private BroadcastReceiver sdkReceiver;
     private Player.EventListener fileViewPlayerListener;
 
@@ -314,6 +319,7 @@ public class FileViewFragment extends BaseFragment implements
         if (claim != null) {
             Helper.saveViewHistory(currentUrl, claim);
             checkAndLoadRelatedContent();
+            checkAndLoadComments();
             renderClaim();
             if (claim.getFile() == null) {
                 loadFile();
@@ -448,6 +454,7 @@ public class FileViewFragment extends BaseFragment implements
             loadFile();
         }
         checkOwnClaim();
+        checkAndLoadComments();
     }
 
     private String getStreamingUrl() {
@@ -529,6 +536,7 @@ public class FileViewFragment extends BaseFragment implements
         if (claim != null) {
             Helper.saveViewHistory(url, claim);
             checkAndLoadRelatedContent();
+            checkAndLoadComments();
             renderClaim();
         }
     }
@@ -568,7 +576,7 @@ public class FileViewFragment extends BaseFragment implements
             loadAndScheduleDurations();
         }
 
-        if (Lbry.SDK_READY) {
+        if (!Lbry.SDK_READY) {
             if (context instanceof MainActivity) {
                 ((MainActivity) context).addSdkStatusListener(this);
             }
@@ -648,6 +656,7 @@ public class FileViewFragment extends BaseFragment implements
                     loadFile();
 
                     checkAndLoadRelatedContent();
+                    checkAndLoadComments();
                     renderClaim();
                 } else {
                     // render nothing at location
@@ -985,9 +994,13 @@ public class FileViewFragment extends BaseFragment implements
         });
 
         RecyclerView relatedContentList = root.findViewById(R.id.file_view_related_content_list);
+        RecyclerView commentsList = root.findViewById(R.id.file_view_comments_list);
         relatedContentList.setNestedScrollingEnabled(false);
-        LinearLayoutManager llm = new LinearLayoutManager(getContext());
+        commentsList.setNestedScrollingEnabled(false);
-        relatedContentList.setLayoutManager(llm);
+        LinearLayoutManager relatedContentListLLM = new LinearLayoutManager(getContext());
+        LinearLayoutManager commentsListLLM = new LinearLayoutManager(getContext());
+        relatedContentList.setLayoutManager(relatedContentListLLM);
+        commentsList.setLayoutManager(commentsListLLM);
     }
 
     private void deleteCurrentClaim() {
@@ -1300,6 +1313,22 @@ public class FileViewFragment extends BaseFragment implements
         }
     }
 
+    private void checkAndLoadComments() {
+        View root = getView();
+        if (root != null) {
+            RecyclerView commentsList = root.findViewById(R.id.file_view_comments_list);
+            if (commentsList == null || commentsList.getAdapter() == null || commentsList.getAdapter().getItemCount() == 0) {
+                TextView commentsSDKInitializing = root.findViewById(R.id.file_view_comments_sdk_initializing);
+                if (Lbry.SDK_READY) {
+                    Helper.setViewVisibility(commentsSDKInitializing, View.GONE);
+                    loadComments();
+                } else {
+                    Helper.setViewVisibility(commentsSDKInitializing, View.VISIBLE);
+                }
+            }
+        }
+    }
+
     private void showUnsupportedView() {
         View root = getView();
         if (root != null) {
@@ -1839,6 +1868,39 @@ public class FileViewFragment extends BaseFragment implements
         }
     }
 
+    private void loadComments() {
+        View root = getView();
+        ProgressBar relatedLoading = root.findViewById(R.id.file_view_comments_progress);
+        if (claim != null && root != null) {
+            CommentListTask relatedTask = new CommentListTask(1, 999, claim.getClaimId(), relatedLoading, new CommentListHandler() {
+                @Override
+                public void onSuccess(List<Comment> comments) {
+                    Context ctx = getContext();
+                    if (ctx != null) {
+                        commentListAdapter = new CommentListAdapter(comments, ctx);
+
+                        View v = getView();
+                        if (v != null) {
+                            RecyclerView relatedContentList = root.findViewById(R.id.file_view_comments_list);
+                            relatedContentList.setAdapter(commentListAdapter);
+                            commentListAdapter.notifyDataSetChanged();
+
+                            Helper.setViewVisibility(
+                                    v.findViewById(R.id.file_view_no_comments),
+                                    commentListAdapter == null || commentListAdapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
+                        }
+                    }
+                }
+
+                @Override
+                public void onError(Exception error) {
+
+                }
+            });
+            relatedTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+        }
+    }
+
     public boolean onBackPressed() {
         if (isInFullscreenMode()) {
             disableFullScreenMode();

app/src/main/java/io/lbry/browser/utils/Lbry.java

@@ -102,6 +102,8 @@ public final class Lbry {
     public static final String METHOD_STREAM_ABANDON = "stream_abandon";
     public static final String METHOD_STREAM_REPOST = "stream_repost";
 
+    public static final String METHOD_COMMENT_LIST = "comment_list";
+
     public static KeyStore KEYSTORE;
     public static boolean SDK_READY = false;
 

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

@@ -480,23 +480,24 @@
                     android:layout_height="wrap_content"
                     android:layout_marginLeft="16dp"
                     android:layout_marginRight="16dp">
+
                     <LinearLayout
                         android:id="@+id/file_view_publisher_name_area"
-                        android:clickable="true"
-                        android:orientation="vertical"
-                        android:layout_centerVertical="true"
                         android:layout_width="match_parent"
-                        android:layout_height="wrap_content">
+                        android:layout_height="wrap_content"
+                        android:clickable="true"
+                        android:orientation="vertical">
+
                         <TextView
                             android:id="@+id/file_view_publisher_name"
-                            android:background="?attr/selectableItemBackground"
-                            android:clickable="true"
                             android:layout_width="wrap_content"
                             android:layout_height="wrap_content"
-                            android:textSize="14sp"
+                            android:background="?attr/selectableItemBackground"
-                            android:textColor="@color/lbryGreen"
+                            android:clickable="true"
                             android:fontFamily="@font/inter"
-                            android:textFontWeight="600" />
+                            android:textColor="@color/lbryGreen"
+                            android:textFontWeight="600"
+                            android:textSize="14sp" />
                     </LinearLayout>
                     <io.lbry.browser.ui.controls.SolidIconView
                         android:id="@+id/file_view_icon_follow_unfollow"
@@ -611,6 +612,75 @@
                         android:layout_width="match_parent"
                         android:layout_height="wrap_content" />
                 </LinearLayout>
+
+                <View
+                    android:layout_width="match_parent"
+                    android:layout_height="0.5dp"
+                    android:layout_marginBottom="12dp"
+                    android:background="@color/divider" />
+
+                <LinearLayout
+                    android:id="@+id/file_view_comments_area"
+                    android:layout_width="match_parent"
+                    android:layout_height="match_parent"
+                    android:layout_marginBottom="8dp"
+                    android:orientation="vertical">
+
+                    <RelativeLayout
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginLeft="16dp"
+                        android:layout_marginRight="16dp">
+
+                        <ProgressBar
+                            android:id="@+id/file_view_comments_progress"
+                            android:layout_width="16dp"
+                            android:layout_height="16dp"
+                            android:layout_alignParentRight="true"
+                            android:layout_centerVertical="true"
+                            android:visibility="gone" />
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:layout_centerVertical="true"
+                            android:fontFamily="@font/inter"
+                            android:text="@string/comments"
+                            android:textSize="16sp" />
+                    </RelativeLayout>
+
+                    <TextView
+                        android:id="@+id/file_view_no_comments"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginLeft="16dp"
+                        android:layout_marginRight="16dp"
+                        android:layout_marginTop="8dp"
+                        android:fontFamily="@font/inter"
+                        android:text="@string/no_comments"
+                        android:textFontWeight="300"
+                        android:textSize="14sp"
+                        android:visibility="gone" />
+
+                    <TextView
+                        android:id="@+id/file_view_comments_sdk_initializing"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginLeft="16dp"
+                        android:layout_marginRight="16dp"
+                        android:layout_marginTop="8dp"
+                        android:fontFamily="@font/inter"
+                        android:text="@string/sdk_initializing_comments"
+                        android:textFontWeight="300"
+                        android:textSize="14sp"
+                        android:visibility="gone" />
+
+                    <androidx.recyclerview.widget.RecyclerView
+                        android:id="@+id/file_view_comments_list"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:overScrollMode="never" />
+                </LinearLayout>
             </LinearLayout>
         </androidx.core.widget.NestedScrollView>
     </LinearLayout>

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

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/selectableItemBackground"
+    android:clickable="true"
+    android:focusable="true"
+    android:orientation="vertical"
+    android:paddingBottom="8dp"
+    android:paddingLeft="16dp"
+    android:paddingRight="16dp"
+    android:paddingTop="8dp">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/comment_channel_name"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:fontFamily="@font/inter"
+            android:text="channel_name"
+            android:textColor="@color/lbryGreen"
+            android:textSize="14sp" />
+
+        <TextView
+            android:id="@+id/comment_text"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:fontFamily="@font/inter"
+            android:text="comment_text" />
+    </LinearLayout>
+
+</LinearLayout>

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

@@ -59,6 +59,9 @@
     <string name="report">Report</string>
     <string name="loading_decentralized_data">Loading decentralized data...</string>
     <string name="related_content">Related Content</string>
+    <string name="comments">Comments</string>
+    <string name="no_comments">No comments to display.</string>
+    <string name="sdk_initializing_comments">Comments will display once the background service is done initializing.</string>
     <string name="share_lbry_content">Share LBRY content</string>
     <string name="view">View</string>
     <string name="play">Play</string>