EmptyRecyclerView.java

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;

public class EmptyRecyclerView extends RecyclerView {

	@Nullable
	private View emptyView;

	public EmptyRecyclerView(Context context) {
		super(context);
	}

	public EmptyRecyclerView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public EmptyRecyclerView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	@Override
	public void setAdapter(@Nullable Adapter adapter) {
		final Adapter oldAdapter = getAdapter();
		if (oldAdapter != null) {
			oldAdapter.unregisterAdapterDataObserver(observer);
		}

		if (adapter != null) {
			adapter.registerAdapterDataObserver(observer);
		}
		super.setAdapter(adapter);
		checkIfEmpty();
	}

	@NonNull
	private final AdapterDataObserver observer = new AdapterDataObserver() {
		@Override
		public void onChanged() {
			super.onChanged();
			checkIfEmpty();
		}

		@Override
		public void onItemRangeInserted(int positionStart, int itemCount) {
			super.onItemRangeInserted(positionStart, itemCount);
			checkIfEmpty();
		}

		@Override
		public void onItemRangeRemoved(int positionStart, int itemCount) {
			super.onItemRangeRemoved(positionStart, itemCount);
			checkIfEmpty();
		}
	};

	/**
	 * Indicates the view to be shown when the adapter for this object is empty
	 *
	 * @param emptyView
	 */
	public void setEmptyView(@Nullable View emptyView) {
		if (this.emptyView != null) {
			this.emptyView.setVisibility(GONE);
		}

		this.emptyView = emptyView;
		checkIfEmpty();
	}

	/**
	 * Check adapter item count and toggle visibility of empty view if the adapter is empty
	 */
	private void checkIfEmpty() {
		if (emptyView == null || getAdapter() == null) {
			return;
		}

		if (getAdapter().getItemCount() > 0) {
			emptyView.setVisibility(GONE);
		} else {
			emptyView.setVisibility(VISIBLE);
		}
	}

}