Keep state (data) in Fragment when replace fragment and go back

MyListFragment.java

package vn.vadaihiep.keepstatefragment;

import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by [email protected] on 11/5/2015.
 */
public class MyListFragment extends Fragment {
    private View mainView;

    private RecyclerView mRecyclerView;
    private MyAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    /**
    * When go back, this function will not be called 
    **/
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new MyAdapter();
    }

    @Override
    public void onStart() {
        super.onStart();

        // Load data if data is empty
        if (mAdapter.getItemCount() == 0) {
            loadAndAddItem();
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mainView = inflater.inflate(R.layout.fragment_my_list, container, false);

        mRecyclerView = (RecyclerView) mainView.findViewById(R.id.my_recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getContext());
        mRecyclerView.setLayoutManager(mLayoutManager);

        mRecyclerView.setAdapter(mAdapter);

        mainView.findViewById(R.id.btnAdd).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                loadAndAddItem();
            }
        });

        return mainView;
    }

    private ProgressDialog progressDialog;

    /**
     * Gia vo load data  = handler.postDelayed
     */
    private void loadAndAddItem() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(getContext());
            progressDialog.setMessage("Loading...");
        }

        progressDialog.show();

        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                int size = mAdapter.getItemCount();
                for (int i = size; i < size + 15; i++) {
                    mAdapter.add("Item number " + i);
                }

                mAdapter.notifyDataSetChanged();
                progressDialog.dismiss();
            }
        }, 2000);
    }

    @Override
    public void onDestroyView() {
        Log.d("VAdaihiep", "onDestroyView");
        super.onDestroyView();
    }
}