fix coding styles.

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

@@ -3,20 +3,24 @@ package chat.rocket.android.helper;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 
+@SuppressWarnings("PMD.AbstractNaming")
 public abstract class LoadMoreScrollListener extends RecyclerView.OnScrollListener {
 
   private final LinearLayoutManager layoutManager;
   private final int loadThreshold;
   private boolean isLoading;
 
+  /**
+   * constructor. loadThreshold is better to set to 0.4 * total.
+   */
   public LoadMoreScrollListener(LinearLayoutManager layoutManager, int loadThreshold) {
     this.layoutManager = layoutManager;
     this.loadThreshold = loadThreshold;
     setLoadingDone();
   }
 
-  @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
-    super.onScrolled(recyclerView, dx, dy);
+  @Override public void onScrolled(RecyclerView recyclerView, int deltaX, int deltaY) {
+    super.onScrolled(recyclerView, deltaX, deltaY);
 
     final int visibleItemCount = recyclerView.getChildCount();
     final int totalItemCount = layoutManager.getItemCount();
@@ -25,7 +29,7 @@ public abstract class LoadMoreScrollListener extends RecyclerView.OnScrollListen
     if (!isLoading
         && firstVisibleItem + visibleItemCount >= totalItemCount - loadThreshold
         && visibleItemCount < totalItemCount
-        && dy < 0) {
+        && deltaY < 0) {
       isLoading = true;
       requestMoreItem();
     }

app/src/main/java/chat/rocket/android/layouthelper/ExtRealmModelListAdapter.java

@@ -6,6 +6,7 @@ import chat.rocket.android.realm_helper.RealmModelListAdapter;
 import chat.rocket.android.realm_helper.RealmModelViewHolder;
 import io.realm.RealmObject;
 
+@SuppressWarnings({"PMD.AbstractNaming", "PMD.GenericsNaming"})
 /**
  * RealmModelListAdapter with header and footer.
  */