Endless scroll listener

Endless scroll

    /**
     * This will ensure that this SwipeableRecyclerViewTouchListener is paused during list view scrolling.
     * If a scroll listener is already assigned, the caller should still pass scroll changes through
     * to this listener.
     */

    public static abstract class EndlessScrollListener extends RecyclerView.OnScrollListener {


        private int mPreviousTotal = 0; // The total number of items in the dataset after the last load
        private boolean mLoading = true; // True if we are still waiting for the last set of data to load.
        private int mVisibleThreshold = 3; // The minimum amount of items to have below your current scroll position before mLoading more.
        private int mFirstVisibleItem, mVisibleItemCount, mTotalItemCount;

        private int mCurrentPage = 1;

        private LinearLayoutManager mLinearLayoutManager;

        public EndlessScrollListener(LinearLayoutManager linearLayoutManager) {
            this.mLinearLayoutManager = linearLayoutManager;
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            mVisibleItemCount = recyclerView.getChildCount();
            mTotalItemCount = mLinearLayoutManager.getItemCount();
            mFirstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();

            if (mLoading) {
                if (mTotalItemCount > mPreviousTotal) {
                    mLoading = false;
                    mPreviousTotal = mTotalItemCount;
                }
            }
            if (!mLoading && (mTotalItemCount - mVisibleItemCount)
                    <= (mFirstVisibleItem + mVisibleThreshold)) {
                // End has been reached
                // Do something
                mCurrentPage++;

                onLoadMore(mCurrentPage);

                mLoading = true;
            }
        }

        // Defines the process for actually loading more data based on page
        public abstract void onLoadMore(int page);
    }