创建/销毁还是显示/隐藏片段？

Question

I have a situation in which I need to show/hide a fragment based on a dynamic variable. My question is should I create the fragment once, and then show/hide based on the variable. Or should I destroy/create it each time?

Create the fragment

Fragment alertFragment = new AlertFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(android.R.id.content, alertFragment).commit();

After this should I call show/hide each time?

getSupportFragmentManager().beginTransaction()
          .setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out)
          .show(alertFragment)  // or hide
          .commit();

Seems like a lot of work to show/hide something each time. Is this the right way to do it?

Answer 1

I'd say that depends on weather it matters for your application if your Fragment is destroyed or not.

If it doesn't matter at all, simply replace the Fragment everytime by a new one. This is the simplest solution and does not require any logic.

Fragment f = new Fragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content, f).commit();