FragmentFactory

import android.support.v4.app.Fragment;
import java.util.HashMap;
public class FragmentFactory {
    private static HashMap<Integer, Fragment> savedFragment = new HashMap<Integer, Fragment>();

    public static Fragment getFragment(int position) {
        Fragment fragment = savedFragment.get(position);
        if (fragment == null) {
            switch (position) {
                case 0:
                    fragment = new Fragment01();
                    break;
                case 1:
                    fragment = new Fragment02();
                    break;
                case 2:
                    fragment = new Fragment03();
                    break;
                case 3:
                    fragment = new Fragment04();
                    break;

            }
            savedFragment.put(position, fragment);
        }

        return fragment;
    }

}