Searching comments in ViewPostDetailActivity is available.

app/src/main/AndroidManifest.xml

@@ -406,7 +406,8 @@
         <activity
             android:name=".activities.ViewPostDetailActivity"
             android:parentActivityName=".activities.MainActivity"
-            android:theme="@style/AppTheme.Slidable" />
+            android:theme="@style/AppTheme.Slidable"
+            android:windowSoftInputMode="adjustPan" />
         <activity
             android:name=".activities.ViewSubredditDetailActivity"
             android:parentActivityName=".activities.MainActivity"

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

@@ -300,6 +300,28 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
         if (savedInstanceState == null) {
             viewPager2.setCurrentItem(getIntent().getIntExtra(EXTRA_POST_LIST_POSITION, 0), false);
         }
+        nextResultImageView.setOnClickListener(view -> {
+            ViewPostDetailFragment fragment = sectionsPagerAdapter.getCurrentFragment();
+            if (fragment != null) {
+                searchComment(fragment, true);
+            }
+        });
+
+        previousResultImageView.setOnClickListener(view -> {
+            ViewPostDetailFragment fragment = sectionsPagerAdapter.getCurrentFragment();
+            if (fragment != null) {
+                searchComment(fragment, false);
+            }
+        });
+
+        closeSearchPanelImageView.setOnClickListener(view -> {
+            ViewPostDetailFragment fragment = sectionsPagerAdapter.getCurrentFragment();
+            if (fragment != null) {
+                fragment.resetSearchCommentIndex();
+            }
+
+            searchPanelMaterialCardView.setVisibility(View.GONE);
+        });
     }
 
     public boolean isNsfwSubreddit() {
@@ -396,6 +418,10 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
         }
     }
 
+    public void searchComment(ViewPostDetailFragment fragment, boolean searchNextComment) {
+        fragment.searchComment(searchTextInputEditText.getText().toString(), searchNextComment);
+    }
+
     @Subscribe
     public void onAccountSwitchEvent(SwitchAccountEvent event) {
         if (!getClass().getName().equals(event.excludeActivityClassName)) {

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

@@ -139,6 +139,8 @@ public class CommentsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerVi
 
     private Drawable mCommentIcon;
 
+    private int mSearchCommentIndex = -1;
+
     public CommentsRecyclerViewAdapter(AppCompatActivity activity, ViewPostDetailFragment fragment,
                                        CustomThemeWrapper customThemeWrapper,
                                        Executor executor, Retrofit retrofit, Retrofit oauthRetrofit,
@@ -396,6 +398,9 @@ public class CommentsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerVi
         if (holder instanceof CommentViewHolder) {
             Comment comment = getCurrentComment(position);
             if (comment != null) {
+                if (position == mSearchCommentIndex) {
+                    holder.itemView.setBackgroundColor(Color.parseColor("#03A9F4"));
+                }
                 if (mIsSingleCommentThreadMode && comment.getId().equals(mSingleCommentId)) {
                     holder.itemView.setBackgroundColor(mSingleCommentThreadBackgroundColor);
                 } else if (comment.getAwards() != null && !comment.getAwards().equals("")) {
@@ -1036,6 +1041,18 @@ public class CommentsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerVi
         }
     }
 
+    public int getSearchCommentIndex() {
+        return mSearchCommentIndex;
+    }
+
+    public void highlightSearchResult(int searchCommentIndex) {
+        mSearchCommentIndex = searchCommentIndex;
+    }
+
+    public void resetCommentSearchIndex() {
+        mSearchCommentIndex = -1;
+    }
+
     @Override
     public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
         if (holder instanceof CommentViewHolder) {

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

@@ -766,6 +766,56 @@ public class ViewPostDetailFragment extends Fragment implements FragmentCommunic
         }
     }
 
+    public void searchComment(String query, boolean searchNextComment) {
+        if (mCommentsAdapter != null) {
+            ArrayList<Comment> visibleComments = mCommentsAdapter.getVisibleComments();
+            int currentSearchIndex = mCommentsAdapter.getSearchCommentIndex();
+            if (visibleComments != null) {
+                if (searchNextComment) {
+                    for (int i = currentSearchIndex + 1; i < visibleComments.size(); i++) {
+                        if (visibleComments.get(i).getCommentRawText() != null && visibleComments.get(i).getCommentRawText().contains(query)) {
+                            if (mCommentsAdapter != null) {
+                                if (mCommentsRecyclerView == null) {
+                                    mRecyclerView.smoothScrollToPosition(i + 1);
+                                } else {
+                                    mCommentsRecyclerView.smoothScrollToPosition(i);
+                                }
+                                mCommentsAdapter.highlightSearchResult(i);
+                                mCommentsAdapter.notifyItemChanged(i);
+                            }
+                            return;
+                        }
+                    }
+
+                    return;
+                } else {
+                    for (int i = currentSearchIndex - 1; i >= 0; i--) {
+                        if (visibleComments.get(i).getCommentRawText() !=null && visibleComments.get(i).getCommentRawText().contains(query)) {
+                            if (mCommentsAdapter != null) {
+                                if (mCommentsRecyclerView == null) {
+                                    mRecyclerView.smoothScrollToPosition(i + 1);
+                                } else {
+                                    mCommentsRecyclerView.smoothScrollToPosition(i);
+                                }
+                                mCommentsAdapter.highlightSearchResult(i);
+                                mCommentsAdapter.notifyItemChanged(i);
+                            }
+                            return;
+                        }
+                    }
+
+                    return;
+                }
+            }
+        }
+    }
+
+    public void resetSearchCommentIndex() {
+        if (mCommentsAdapter != null) {
+            mCommentsAdapter.resetCommentSearchIndex();
+        }
+    }
+
     @Override
     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
         inflater.inflate(R.menu.view_post_detail_fragment, menu);