How to save fragments states to avoid re-creating them

Question

I've implemented something like the below picture:

I have some Tabs and every tab may have some buttons which load some different fragments. In this situation, in Tab 1, Button 1 loads Fragment 1, and Button 2 loads Fragment 2 and each time the Fragments will be re-created. but I want Buttons to load Fragments just once and avoid re-creating next times.

Button 1 current onClick:

FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container_root, FragmentOne.newInstance(),"Frag1");
transaction.commit();

How can I save fragments states to avoid reloading every time?

EDIT

The Tab 1 and Tab 2 Fragments are inside a ViewPager so I could not use ViewPager for Fragment 1 and Fragment 2.

@AravindV the root fragment that contains Button 1 and Button 2 is inside ViewPager. I don't want to implement a ViewPager inside another ViewPager. — Alireza Noorali
– Alireza Noorali, Commented May 20, 2019 at 9:08

Rahul Khurana · Accepted Answer · 2019-05-20 09:39:41Z

0

Use below code

FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.add(R.id.container_root, FragmentOne.newInstance(),"Frag1");
transaction.addToBackStack("Frag1");
transaction.commit();

instead of

FragmentTransaction transaction = 
getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container_root, FragmentOne.newInstance(),"Frag1");
transaction.commit();

Problem:

You are trying to replace fragment while adding them via FragmentTransaction. If you need to keep instance of them you need to use transaction.add method.

Caution:

Using this method can overlap fragments. So you need to add backgroundcolor to both fragments and make the parent layout as clickable so that you can interact

answered May 20, 2019 at 9:39

Rahul Khurana

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Comments

Alireza Noorali · Accepted Answer · 2019-05-20 10:29:14Z

0

you can create your tabs with viewpager

ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
pager.setOffscreenPageLimit(tabsNumber - 1); // e.g. send 2 as parameter for 3 tabs

and save your tab state

edited May 20, 2019 at 10:29

Alireza Noorali

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answered May 20, 2019 at 8:36

Poorya Taghizade

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3 Comments

Alireza Noorali Over a year ago

I used ViewPager to implement my tabs but the root fragment that contains Button 1 and Button 2 is inside ViewPager. I don't want to implement a ViewPager inside another ViewPager.

Poorya Taghizade Over a year ago

when you use viewpager page limit your tab not getting re create so wich Fragment was present in tab 2 remains present

Alireza Noorali Over a year ago

I think you did not pay enough attention to the picture I shared. Two different fragments inside Tab 1 made the problem.

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