A RecyclerView.OnScrollListener that adds support for scroll-enabled pagination. Attach it to your RecyclerView via your RecyclerView's addOnScrollListener(RecyclerView.OnScrollListener) method.

ContinuousScrollListener.java

import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

/**
 * A RecyclerView.OnScrollListener that adds support for scroll-enabled pagination.
 */
public abstract class ContinuousScrollListener extends RecyclerView.OnScrollListener {
    private static String TAG = ContinuousScrollListener.class.getSimpleName();

    // Layout manager used on the RecyclerView.
    private LinearLayoutManager mLinearLayoutManager;
    // Number of items to load at a time.
    private int mItemLoadLimit = 15;
    // Minimum number of items to have below the currently visible items before loading more.
    private int mThreshold = mItemLoadLimit / 2;
    // Total number of items in the dataset after the last load.
    private int mPreviousTotalItemCount;
    // True if application is waiting for the most recently requested set of data to load.
    private boolean mLoading = true;

    public ContinuousScrollListener(LinearLayoutManager linearLayoutManager) {
        mLinearLayoutManager = linearLayoutManager;
    }

    public ContinuousScrollListener(LinearLayoutManager linearLayoutManager, int itemLoadLimit) {
        this(linearLayoutManager);
        mItemLoadLimit = itemLoadLimit;
    }

    public ContinuousScrollListener(LinearLayoutManager linearLayoutManager, int itemLoadLimit, int threshold) {
        this(linearLayoutManager, itemLoadLimit);
        mThreshold = threshold;
    }

    /**
     * Defines the process of loading more data.
     * Note that the caller is responsible for determining the offset.
     * @param itemLimit: The number of items to load.
     */
    public abstract void onLoadMore(int itemLimit);

    @Override
    public void onScrolled(RecyclerView recyclerView, int deltaX, int deltaY) {
        super.onScrolled(recyclerView, deltaX, deltaY);
        int totalItemCount = mLinearLayoutManager.getItemCount();
        int lastVisibleItemPosition = mLinearLayoutManager.findLastVisibleItemPosition();

        if (mLoading && totalItemCount > mPreviousTotalItemCount) {
            // Since the dataset count has increased, assume that the loading has finished.
            mLoading = false;
            mPreviousTotalItemCount = totalItemCount;
        }
        // If a load is not in progress, check to see if the scroll threshold has been breached.
        else if (!mLoading && totalItemCount <= (lastVisibleItemPosition + mThreshold)) {
            // The threshold has been breached; attempt to fetch more data.
            onLoadMore(mItemLoadLimit);
            mLoading = true;
        }
        else if (mPreviousTotalItemCount > totalItemCount) {
            // The adapter has been refreshed or invalided; reset mPreviousTotalItemCount.
            mPreviousTotalItemCount = 0;
        }
    }
}