content: package com.abdeveloper.library;
  
  import android.content.Context;
  import android.support.v7.widget.RecyclerView;
  import android.util.AttributeSet;
  import android.view.View;
  
  public class RecyclerViewEmptySupport extends RecyclerView {
      private View emptyView;
      final private AdapterDataObserver observer = new AdapterDataObserver() {
          @Override
          public void onChanged() {
              checkIfEmpty();
          }
  
          @Override
          public void onItemRangeInserted(int positionStart, int itemCount) {
              checkIfEmpty();
          }
  
          @Override
          public void onItemRangeRemoved(int positionStart, int itemCount) {
              checkIfEmpty();
          }
      };
  
      public RecyclerViewEmptySupport(Context context) {
          super(context);
      }
  
      public RecyclerViewEmptySupport(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public RecyclerViewEmptySupport(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
      }
  
      void checkIfEmpty() {
          if (emptyView != null && getAdapter() != null) {
              final boolean emptyViewVisible = getAdapter().getItemCount() == 0;
              emptyView.setVisibility(emptyViewVisible ? VISIBLE : GONE);
              setVisibility(emptyViewVisible ? GONE : VISIBLE);
          }
      }
  
      @Override
      public void setAdapter(Adapter adapter) {
          final Adapter oldAdapter = getAdapter();
          if (oldAdapter != null) {
              oldAdapter.unregisterAdapterDataObserver(observer);
          }
          super.setAdapter(adapter);
          if (adapter != null) {
              adapter.registerAdapterDataObserver(observer);
          }
  
          checkIfEmpty();
      }
  
      public void setEmptyView(View emptyView) {
          this.emptyView = emptyView;
          checkIfEmpty();
      }
  }
  