CODEWITHSUNDEEP
androidandroid-fragments
Amsheer
Amsheer

Reputation: 7131

Android fragment back press without any data loss

I am creating an application with navigation drawer when I click each navigation list new fragments will load. One of the fragment have listView. When I click this list load another fragment. Now I move to different fragments using navigation drawer. When I press back button every time I want to move to previous fragment without any data change.How can I do it?

I am loading fragment using the following code:

FragmentManager fm = getFragmentManager();
        for (int i = 0; i < fm.getBackStackEntryCount(); i++) {
            fm.popBackStack();
        }
    FragmentTransaction fragmentTransaction = fm.beginTransaction();
            fragmentTransaction.replace(R.id.fragmentHome, fr);
            fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
            fragmentTransaction.commit();

In short:: Every back press I want to load previous fragment without recreating it

Upvotes: 1

Views: 2728

Answers (2)

Mayur Raval
Mayur Raval

Reputation: 3275

I think this may help

Just Do PopBackStack from Fragmentmanager

FragmentManager fm = getFragmentManager();
        for (int i = 0; i < fm.getBackStackEntryCount(); i++) {
            fm.popBackStack();
        }

And In that Fragment

View mView ; //this will be global

@Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        try {
            if (mView == null) {
                // view will be initialize for the first time .. you can out condition for that if data is not null then do not initialize view again. 
                mView = inflater.inflate(R.layout.xml,container, false);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return mView;
    }

Upvotes: 5

Rishabh Mahatha
Rishabh Mahatha

Reputation: 1271

public  void addFragment( final Fragment newFragment, final Fragment hideFragment) {
    final FragmentManager fragmentManager = getFragmentManager();
    final FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.hide(hideFragment);
    fragmentTransaction.add(R.id.container, newFragment, newFragment.getClass().getSimpleName());
    fragmentTransaction.addToBackStack(hideFragment.getClass().getSimpleName());
    fragmentTransaction.commitAllowingStateLoss();
}

Use this instead of replacing fragment.will solve your problem.

Upvotes: 0

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