Heterogeneous Recycler Adapter; a simple way to define diverse RecyclerView content.

HeterogeneousAdapter.java

/**
 * Created by Alexander Thomas (@Cawfree) on 03/07/2017.
 */

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.List;

/** A RecyclerAdapter that doesn't care about the data, or the views, it contains. That's left up to the caller. */
public class HeterogeneousAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    /* Member Variables. */
    private final List<Element> mItems;

    /** Constructor. */
    public HeterogeneousAdapter(final List<Element> pItems) {
        // Initialize Member Variables.
        this.mItems = pItems;
    }

    /** Defines a heterogeneous element. */
    public static abstract class Element {
        /** Configures the binding methodology for the RecyclerView. */
        public abstract void onBindViewHolder(final RecyclerView.ViewHolder pViewHolder);
        /** Defines the ResourceId of the layout to use when inflating this Element. */
        public abstract int     getResourceId();
    }

    @Override
    public final RecyclerView.ViewHolder onCreateViewHolder(final ViewGroup pViewGroup, final int pViewType) {
        // Inflate the ResourceId indicated by the ViewType.
        final View lView = LayoutInflater.from(pViewGroup.getContext()).inflate(pViewType, pViewGroup, false);
        // Return the View wrapped as a ViewHolder.
        return new RecyclerView.ViewHolder(lView) { /* Don't care. */ };
    }

    @Override
    public final int getItemViewType(final int pPosition) {
        // Fetch the ResourceId as the ViewType.
        return this.getItems().get(pPosition).getResourceId();
    }

    @Override
    public final void onBindViewHolder(final RecyclerView.ViewHolder pViewHolder, final int pPosition) {
        // Fetch the Element.
        this.getItems().get(pPosition).onBindViewHolder(pViewHolder);
    }

    @Override
    public final int getItemCount() {
        // Use the size of the items.
        return this.getItems().size();
    }

    /* Getters. */
    public final List<Element> getItems() {
        return this.mItems;
    }

}