How to create Endless recycleview by using OnScrollListener in android

by using you can loading a hug of data on server....with taken a lot of time

Mainactivity.java

package com.numetriclabz.recyclerviewwithsearch;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;

import org.json.JSONArray;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    public SearchView search;
    private List<String> list = new ArrayList<String>();
    Adapter mAdapter;
    protected Handler handler;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        createlist();  // in this method, Create a list of items.        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mAdapter = new Adapter(list, mRecyclerView);
        mRecyclerView.setAdapter(mAdapter);
        handler = new Handler();

        mAdapter.setOnLoadMoreListener(new Adapter.OnLoadMoreListener() {
            @Override            public void onLoadMore()
            {
                //add progress item                list.add(null);
                mAdapter.notifyItemInserted(list.size() - 1);
                handler.postDelayed(new Runnable() {
                    @Override                    public void run() {
                        //remove progress item                        list.remove(list.size() - 1);
                        mAdapter.notifyItemRemoved(list.size());
                        //add items one by one                        for (int i = 0; i < 15; i++)
                        {
                            list.add("Item " + (list.size() + 1));
                            mAdapter.notifyItemInserted(list.size());
                        }
                        mAdapter.setLoaded();
                        //or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged();                    }
                }, 2000);
                System.out.println("load");
            }
        });


    }

    // this method is used to create list of items.    public void createlist(){
        for(int i=1; i<=12;i++) {
            list.add("Item "+i);
        }
    }

}

Adapter.java

package com.numetriclabz.recyclerviewwithsearch;

/** * Created by vishal on 9/12/15. */import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.util.List;

public class Adapter<T> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private final int VIEW_ITEM = 1;
    private final int VIEW_PROG = 0;

    private List<T> mDataset;

    // The minimum amount of items to have below your current scroll position before loading more.    private int visibleThreshold = 2;
    private int lastVisibleItem, totalItemCount;
    private boolean loading;
    private OnLoadMoreListener onLoadMoreListener;

    public Adapter(List<T> myDataSet, RecyclerView recyclerView) {
        mDataset = myDataSet;

        if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {

            final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
            recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override                public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                    super.onScrolled(recyclerView, dx, dy);

                    totalItemCount = linearLayoutManager.getItemCount();
                    lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
                    if (!loading && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
                        // End has been reached                        // Do something                        if (onLoadMoreListener != null) {
                            onLoadMoreListener.onLoadMore();
                        }
                        loading = true;
                    }
                }
            });
        }
    }

    @Override    public int getItemViewType(int position) {
        return mDataset.get(position) != null ? VIEW_ITEM : VIEW_PROG;
    }

    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        RecyclerView.ViewHolder vh;
        if (viewType == VIEW_ITEM) {
            View v = LayoutInflater.from(parent.getContext())
                    .inflate(android.R.layout.simple_list_item_1, parent, false);

            vh = new TextViewHolder(v);
        } else {
            View v = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.progressbar_item, parent, false);

            vh = new ProgressViewHolder(v);
        }
        return vh;
    }

    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof TextViewHolder) {
            ((TextViewHolder) holder).mTextView.setText(mDataset.get(position).toString());
        } else {
            ((ProgressViewHolder) holder).progressBar.setIndeterminate(true);
        }
    }

    public void setLoaded() {
        loading = false;
    }

    @Override    public int getItemCount() {
        return mDataset.size();
    }

    public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
        this.onLoadMoreListener = onLoadMoreListener;
    }

    public interface OnLoadMoreListener {
        void onLoadMore();
    }

    public static class TextViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;

        public TextViewHolder(View v) {
            super(v);
            mTextView = (TextView) v.findViewById(android.R.id.text1);
        }
    }

    public static class ProgressViewHolder extends RecyclerView.ViewHolder {
        public ProgressBar progressBar;

        public ProgressViewHolder(View v) {
            super(v);
            progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
        }
    }
}