A fragment for testing setText performance

TestTextFragment.java

package dnomyar.rxgag.ui.fragments;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
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.TextView;

import java.util.ArrayList;

import butterknife.Bind;
import butterknife.ButterKnife;
import dnomyar.rxgag.R;

/**
 * Created by Raymond on 2016-03-02.
 */
public class TestTextFragment extends BaseFragment {
//    @Bind(R.id.recycler_view)
    RecyclerView recyclerView;

    public static TestTextFragment newInstance() {

        Bundle args = new Bundle();

        TestTextFragment fragment = new TestTextFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_test_text, container, false);
//        ButterKnife.bind(this, v);
        recyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);
        return v;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        recyclerView.setLayoutManager(new LinearLayoutManager(view.getContext()));
        TextAdapter adapter = new TextAdapter();
        recyclerView.setAdapter(adapter);
    }






    private static class TextAdapter extends RecyclerView.Adapter {
        private static final String candidate = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
        private ArrayList<String> list;

        public TextAdapter() {
            list = new ArrayList<>();

            new AsyncTask<Void, Void, Void>(){

                @Override
                protected Void doInBackground(Void... params) {
                    int length = candidate.length();
                    StringBuffer bf = new StringBuffer();
                    for (int i = 0; i < Math.random() * 300 + 300; i++) {
                        for(int j = 0; j < Math.random() * 300 + 300; j++) {
                            int randomPick = (int)(Math.random() * 8000 + 5000);
                            bf.append(candidate.charAt(randomPick % length));
                        }
                        list.add(bf.toString());
                    }
                    return null;
                }

                @Override
                protected void onPostExecute(Void aVoid) {
                    super.onPostExecute(aVoid);
                    notifyDataSetChanged();
                }
            }.execute();
        }

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



            return new ViewHolder(v);
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            ViewHolder vh = (ViewHolder) holder;
            vh.textView.setText(list.get(position));
        }

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

    static class ViewHolder extends RecyclerView.ViewHolder {
        //@Bind(R.id.textTitle)
        TextView textView;


        public ViewHolder(View itemView) {
            super(itemView);
            textView = (TextView) itemView.findViewById(R.id.textTitle);
        }
    }

}