Fixed a bug which causes the app to crash when there is no comment in a post. Add a no comment placeholder which is displayed when there is no comment in a post.

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

@@ -1,5 +1,7 @@
 package ml.docilealligator.infinityforreddit;
 
+import android.net.Uri;
+
 import com.android.volley.Request;
 import com.android.volley.RequestQueue;
 import com.android.volley.Response;
@@ -25,7 +27,12 @@ class FetchComment {
 
     void queryComment(FetchCommentListener fetchCommentListener) {
         mFetchCommentListener = fetchCommentListener;
-        StringRequest commentRequest = new StringRequest(Request.Method.GET, RedditUtils.getQueryCommentUri(subredditName, article), new Response.Listener<String>() {
+
+        Uri uri = Uri.parse(RedditUtils.getQueryCommentUri(subredditName, article))
+                .buildUpon().appendQueryParameter(RedditUtils.RAW_JSON_KEY, RedditUtils.RAW_JSON_VALUE)
+                .build();
+
+        StringRequest commentRequest = new StringRequest(Request.Method.GET, uri.toString(), new Response.Listener<String>() {
             @Override
             public void onResponse(String response) {
                 mFetchCommentListener.onFetchCommentSuccess(response);

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

@@ -53,8 +53,13 @@ class ParseComment {
                 int actualCommentLength;
 
                 JSONArray allComments = jsonResponse.getJSONObject(1).getJSONObject(JSONUtils.DATA_KEY).getJSONArray(JSONUtils.CHILDREN_KEY);
+                if(allComments.length() == 0) {
+                    return null;
+                }
+
                 JSONObject more = allComments.getJSONObject(allComments.length() - 1).getJSONObject(JSONUtils.DATA_KEY);
 
+                //Maybe children contain only comments and no more info
                 if(more.has(JSONUtils.COUNT_KEY)) {
                     moreCommentCount = more.getInt(JSONUtils.COUNT_KEY);
                     actualCommentLength = allComments.length() - 1;
@@ -87,7 +92,6 @@ class ParseComment {
             } catch (JSONException e) {
                 parseFailed = true;
                 Log.i("parse comment error", e.getMessage());
-                mParseCommentListener.onParseCommentFail();
             }
             return null;
         }

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

@@ -16,6 +16,7 @@ import android.support.v7.widget.RecyclerView;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.ImageView;
+import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
@@ -48,6 +49,9 @@ public class ViewPostDetailActivity extends AppCompatActivity {
     private CardView mCommentCardView;
     private RecyclerView mRecyclerView;
 
+    private LinearLayout mNoCommentWrapperLinearLayout;
+    private ImageView mNoCommentImageView;
+
     private RequestQueue mVoteThingQueue;
     private RequestQueue mCommentQueue;
 
@@ -86,6 +90,9 @@ public class ViewPostDetailActivity extends AppCompatActivity {
         mCommentCardView = findViewById(R.id.comment_card_view_view_post_detail);
         mRecyclerView = findViewById(R.id.recycler_view_view_post_detail);
 
+        mNoCommentWrapperLinearLayout = findViewById(R.id.no_comment_wrapper_linear_layout_view_post_detail);
+        mNoCommentImageView = findViewById(R.id.no_comment_image_view_view_post_detail);
+
         if(mPostData.getSubredditIconUrl() == null) {
             new LoadSubredditIconAsyncTask(this, subredditIconCircleImageView,
                     SubredditRoomDatabase.getDatabase(this).subredditDao(), mPostData.getSubredditName(),
@@ -279,6 +286,7 @@ public class ViewPostDetailActivity extends AppCompatActivity {
 
     private void queryComment() {
         mCommentProgressbar.setVisibility(View.VISIBLE);
+        mNoCommentWrapperLinearLayout.setVisibility(View.GONE);
         new FetchComment(mCommentQueue, mPostData.getSubredditName(), mPostData.getId()).queryComment(new FetchComment.FetchCommentListener() {
             @Override
             public void onFetchCommentSuccess(String response) {
@@ -291,6 +299,9 @@ public class ViewPostDetailActivity extends AppCompatActivity {
                             CommentRecyclerViewAdapter adapter = new CommentRecyclerViewAdapter(ViewPostDetailActivity.this, commentData, mVoteThingQueue);
                             mRecyclerView.setAdapter(adapter);
                             mCommentCardView.setVisibility(View.VISIBLE);
+                        } else {
+                            mNoCommentWrapperLinearLayout.setVisibility(View.VISIBLE);
+                            Glide.with(ViewPostDetailActivity.this).load(R.drawable.no_comment_indicator).into(mNoCommentImageView);
                         }
                     }
 

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

@@ -250,6 +250,30 @@
 
             </android.support.v7.widget.CardView>
 
+            <LinearLayout
+                android:id="@+id/no_comment_wrapper_linear_layout_view_post_detail"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="48dp"
+                android:layout_marginBottom="48dp"
+                android:orientation="vertical"
+                android:visibility="gone">
+
+                <ImageView
+                    android:id="@+id/no_comment_image_view_view_post_detail"
+                    android:layout_width="150dp"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center_horizontal" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="16dp"
+                    android:layout_gravity="center_horizontal"
+                    android:text="@string/no_comments_yet"/>
+
+            </LinearLayout>
+
         </LinearLayout>
 
 

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

@@ -12,6 +12,7 @@
     <string name="load_comment_failed">Error loading comments</string>
     <string name="retry">Retry</string>
     <string name="comments">Comments</string>
+    <string name="no_comments_yet">No comments yet. Write a comment?</string>
 
     <string name="nsfw">NSFW</string>
     <string name="karma_info">Karma: %1$d</string>