RecyclerView Not Showing up

I have some text views and a button to be displayed on top of a RecyclerView. I seem to be doing everything right, but somehow nothing is being displayed. I also checked thru logs and the RecyclerView should have data!

This is not the very first time to display RecyclerViews. However, this is the first time I am displaying a RecyclerView with some elements on top of it.

1. activity_home.xml - this is the main home page

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/home_RL"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
   
   <LinearLayout
       android:id="@+id/top_LL"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_alignParentTop="true"
       android:orientation="horizontal">
   
       <EditText
           android:id="@+id/first_name"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_marginStart="4dp"
           android:layout_weight="2"
           android:hint="FirstName" />
   
       <EditText
           android:id="@+id/last_name"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_marginStart="4dp"
           android:layout_weight="2"
           android:hint="LastName" />
   
       <ProgressBar
           android:id="@+id/progress_bar"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:visibility="gone" />
   
       <Button
           android:id="@+id/submit"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_marginStart="4dp"
           android:layout_weight="1"
           android:onClick="goButton"
           android:text="GO" />
   
       <Button
           android:id="@+id/load"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_marginStart="4dp"
           android:layout_marginEnd="4dp"
           android:layout_weight="1"
           android:onClick="loadButton"
           android:text="L" />
   </LinearLayout>
   
   <android.support.v7.widget.RecyclerView
       android:id="@+id/nameList"
       android:layout_below="@+id/top_LL"
       android:layout_width="match_parent"
       android:layout_height="wrap_content">    
   </android.support.v7.widget.RecyclerView></RelativeLayout>
   

2. name_list_item.xml

   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal">
   
       <TextView
           android:id="@+id/list_first_name"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           tools:text="first name"/>
   
       <TextView
           android:id="@+id/list_last_name"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           tools:text="second name"/>
   </LinearLayout>
   
   <View
       android:layout_width="match_parent"
       android:layout_height="1dp"
       android:background="@android:color/darker_gray" />
   

3. Name Adapter

   public class NameAdapter extends RecyclerView.Adapter {

       private List<Name> mNameList;
       private Context mContext;
   
       public NameAdapter(Context context) {
           mContext = context;
       }
   
       @Override
       public NameViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
           LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
           View view = inflater.inflate(R.layout.name_list_item, viewGroup, false);
           return new NameViewHolder(view);
       }
   
       @Override
       public void onBindViewHolder(final NameViewHolder nameViewHolder, int position) {
   
           String firstName = mNameList.get(position).getFirst();
           String lastName = mNameList.get(position).getLast();
   
           nameViewHolder.mListItemFirstName.setText(firstName);
           nameViewHolder.mListItemLastName.setText(lastName);
       }
   
       @Override
       public int getItemCount() {
           if (mNameList == null) {
               return 0;
           }
           return mNameList.size();
       }
   
   
       class NameViewHolder extends RecyclerView.ViewHolder {
   
           TextView mListItemFirstName;
           TextView mListItemLastName;
   
           private NameViewHolder(View itemView) {
               super(itemView);
   
               mListItemFirstName = itemView.findViewById(R.id.list_first_name);
               mListItemLastName = itemView.findViewById(R.id.list_last_name);
           }
   
       }
   
   
   
       public void swapNameList(List<Name> nameList) {
           if (nameList != null) {
               nameList.clear();
           }
           mNameList = nameList;
           this.notifyDataSetChanged();
       }    
   

   }

UPDATE: ISSUE RESOLVED new code should be:

public void swapNameList(List<Name> nameList) {
                if (mNameList != null) {
                    mNameList.clear();
                }
                mNameList = nameList;
                this.notifyDataSetChanged();
            }