How to keep data inside a fragment

Question

I'm using a ViewPager and a FragmentManager to fill some EditText and click on next button to go ahead. But when I click on the previous button to go back to the last fragment, the information inside the form are lost, because I always re-instantiate each fragment like this:

 void previousFragment(){

    Fragment newFragment = new RegisterLink_();
    final FragmentManager fm = getActivity().getSupportFragmentManager();
    final FragmentTransaction ft = fm.beginTransaction();

    ft.setCustomAnimations(R.anim.in, R.anim.out);
    ft.replace(R.id.register_upload, newFragment);
    ft.addToBackStack(null);
    ft.commit();
   }
}

Can someone please tell me how to swipe from a fragment to another one without losing the information inserted by the user. Thanks for your help and sorry for my weak english.

You could keep the information in `onSaveInstanceState` and that will be available in `savedInstance` Bundle when the Fragment is re-shown. — gunar, Dec 10 '13 at 09:15
are these two fragments inside the viewpager? If so what kind of adapter are you using? — bugraoral, Dec 10 '13 at 09:16
Hi wrecker, thanks for your interest. I'm using an adapter inside the MainActivity like this: http://pastie.org/8541607 — Nizar B., Dec 10 '13 at 09:18
Hi gunar, thanks for your help, can you show me one example of savedInstance and onSaveInstanceState ? — Nizar B., Dec 10 '13 at 09:19
Hi Mehul, thanks for your help but can you give me a hint with a link or a full example ? — Nizar B., Dec 10 '13 at 10:13

score 2 · Answer 1 · answered Dec 10 '13 at 09:20

when you navigate between fragment, to preserve data in this cases you can do the following

Have a global variable to hold data, so when you navigate you still have data entered by user
Or before switching fragment, wrap the data into bundle and pass to next fragment using setArgument method same you can retrieve by getArgument in next fragment.

So by any of above when you have preserved your data, you can always initialize all the form fields with proper values entered by user.

score 0 · Answer 2 · answered Dec 10 '13 at 09:19

before calling the previous fragment you have to extract the data from the current fragment. Create a method in the fragment that gives you that value.

FragmentManager fragmentManager = getFragmentManager();
YOUR_FRAGMENT f = (YOUR_FRAGMENT)fragmentManager.findFragmentByTag(THE_TAG);
f.theNewMethod(); // store this!

score 0 · Answer 3 · answered Jan 27 '14 at 07:31

if you want to back to previous fragment using a button, just add this code on your button :

void previousFragment(){
getFragmentManager().popBackStack();
            getFragmentManager().executePendingTransactions();
}

and then you'll not lose your last edit on your previous fragment

How to keep data inside a fragment

3 Answers3