fix pmd issues

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -33,7 +33,7 @@ import chat.rocket.android.helper.RecyclerViewScrolledToBottomListener;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.layouthelper.chatroom.MessageFormManager;
 import chat.rocket.android.layouthelper.chatroom.MessageListAdapter;
-import chat.rocket.android.layouthelper.chatroom.NewMessageIndicatorManager;
+import chat.rocket.android.layouthelper.chatroom.AbstractNewMessageIndicatorManager;
 import chat.rocket.android.layouthelper.chatroom.PairedMessage;
 import chat.rocket.android.layouthelper.extra_action.MessageExtraActionBehavior;
 import chat.rocket.android.layouthelper.extra_action.upload.AbstractUploadActionItem;
@@ -75,7 +75,7 @@ public class RoomFragment extends AbstractChatRoomFragment
   private RealmObjectObserver<LoadMessageProcedure> procedureObserver;
   private MessageFormManager messageFormManager;
   private RecyclerViewAutoScrollManager autoScrollManager;
-  private NewMessageIndicatorManager newMessageIndicatorManager;
+  private AbstractNewMessageIndicatorManager newMessageIndicatorManager;
   private Snackbar unreadIndicator;
   private boolean previousUnreadMessageExists;
 
@@ -173,7 +173,7 @@ public class RoomFragment extends AbstractChatRoomFragment
     listView.addOnScrollListener(
         new RecyclerViewScrolledToBottomListener(layoutManager, 1, this::markAsReadIfNeeded));
 
-    newMessageIndicatorManager = new NewMessageIndicatorManager() {
+    newMessageIndicatorManager = new AbstractNewMessageIndicatorManager() {
       @Override
       protected void onShowIndicator(int count, boolean onlyAlreadyShown) {
         if ((onlyAlreadyShown && unreadIndicator != null && unreadIndicator.isShown())

app/src/main/java/chat/rocket/android/helper/RecyclerViewScrolledToBottomListener.java

@@ -40,8 +40,8 @@ public class RecyclerViewScrolledToBottomListener extends RecyclerView.OnScrollL
 
 
   @Override
-  public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
-    super.onScrolled(recyclerView, dx, dy);
+  public void onScrolled(RecyclerView recyclerView, int deltaX, int deltaY) {
+    super.onScrolled(recyclerView, deltaX, deltaY);
     handler.removeMessages(0);
     handler.sendEmptyMessageDelayed(0, 120);
   }

app/src/main/java/chat/rocket/android/layouthelper/chatroom/NewMessageIndicatorManager.java → app/src/main/java/chat/rocket/android/layouthelper/chatroom/AbstractNewMessageIndicatorManager.java

@@ -3,7 +3,7 @@ package chat.rocket.android.layouthelper.chatroom;
 /**
  * manager class for showing "You have XX messages" indicator.
  */
-public abstract class NewMessageIndicatorManager {
+public abstract class AbstractNewMessageIndicatorManager {
   private int count;
   private boolean onlyAlreadyShown;