Fragment切换 hide show方式

public void onTabSelected(int position) {
                if (position != currentFragmentIndex) {
                    FragmentManager fm = getSupportFragmentManager();
                    FragmentTransaction ft = fm.beginTransaction();

                    Fragment targetFragment = fm.findFragmentByTag("Tab" + position);
                    if (targetFragment == null) {
                        switch (position) {
                            case 1:
                                targetFragment = new SecondFragment();
                                break;
                            case 2:
                                targetFragment = new ThirdFragment();
                                break;
                        }
                         ft.add(R.id.fragment_container,targetFragment,"Tab"+position);
                    }

                    ft.hide(fm.findFragmentByTag("Tab"+currentFragmentIndex))
                      .show(targetFragment)
                      .commit();

                    currentFragmentIndex = position;
                }
      }

http://www.jianshu.com/p/acb7705df1a6