Android RecycleView

package com.example.tanjin.learnrec;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {
    private RecyclerView rv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        rv = new RecyclerView(this);

        setContentView(rv);

        rv.setLayoutManager(new LinearLayoutManager(this));

        rv.setAdapter(new RecyclerView.Adapter() {

            class ViewHolder extends RecyclerView.ViewHolder
            {
                private TextView tv;
                public ViewHolder(View itemView)
                {
                    super(itemView);
                    tv = (TextView)itemView;
                }

                public TextView getTv()
                {
                    return  tv;
                }

            }

            @Override
            public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
                return new ViewHolder(new TextView(viewGroup.getContext()));

            }

            @Override
            public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
                ViewHolder vh = (ViewHolder)viewHolder;
                vh.getTv().setText("item"+i);

            }

            @Override
            public int getItemCount() {
                return 1000;
            }
        });



    }



}

private String[] data = new String[]{"Hello","Android"};

public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
 ViewHolder vh = (ViewHolder)viewHolder;
 vh.getTv().setText(data[i]);
}

 public int getItemCount() {
       return data.length;
        }