onBackPressed with viewpager activity and fragments

Question

i have a viewpager activity containing fragment named OneFragment.

The Onefragment contains a recyclerview,on items click a fragment called DescriptionFragment opens.

This is how i opened the DescriptionFragment from the Adapter:

 Fragment descriptionFragment = new DescriptionFragment ();
                FragmentTransaction transaction = mContext.beginTransaction();
                transaction.replace(R.id.framelayout, descriptionFragment).addToBackStack(null).commit();

Problem: When i click on backpress button the app finishes.

I want on backpress to close the DescriptionFragment and return back to the OneFragment

Muhib Pirani · Accepted Answer · 2017-04-15T14:48:27.377

1

add fragment to stack while comitting a transaction like this

transaction.addToBackStack(OneFragment.getClass().getName);

and your transaction code should look somrething like this

FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction= fragmentManager.beginTransaction();
transaction.replace(..............);
transaction.addToBackStack(null);
transaction.commit();

edited Apr 15 '17 at 14:48

answered Apr 15 '17 at 14:42

Muhib Pirani

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I used(OneFragment.class.getName()) but still getting same result – Mahdi H Apr 15 '17 at 14:52
Instead of mContext.beginTransactiin() try adding fragmentManager.beginTransaction() – Muhib Pirani Apr 15 '17 at 14:57
It worked i was using getChildFragmentManager i changed to FragmentMangaer – Mahdi H Apr 15 '17 at 15:11
Please one more question: How to handle the on resume method? Because when i am resuming the app it restarts it doesn t resume – Mahdi H Apr 15 '17 at 15:14
Everytime either you open app or resume ,onResume method is called. What is exactly the issue you are facing? – Muhib Pirani Apr 15 '17 at 15:24
When i pause the app and then resume it..the app relaunches from 0..i want the app resume my OneFragment – Mahdi H Apr 15 '17 at 15:26
i think it is realted to savedInsatance state of fragment and activity, this might help http://stackoverflow.com/questions/6337217/how-to-return-to-the-latest-launched-activity-when-re-launching-application-afte – Muhib Pirani Apr 15 '17 at 15:31
Thanks it worked on HomeButton press not the backbutton any idea? – Mahdi H Apr 15 '17 at 15:57
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when you press back button the onDestroy method is called and now when you come back there wont be any savedInsatanceState from which the activity can be resumed. – Muhib Pirani Apr 15 '17 at 15:59
Big Thank for help! – Mahdi H Apr 15 '17 at 16:14

onBackPressed with viewpager activity and fragments

1 Answers1