android fragment not showing the previous position after transaction

Question

Let us consider that i have 2 fragment a & b

Fragment a contains view pager, horizontal grid view and buttons images etc with scroll. When i click a item in Fragment a it goes to fragment b and when i click on back button in fragment b it comes back to fragment a. Is all working perfect.

My issue is in back press of the fragment b , it load the fragment a from begin. I would like to show the exact place on fragment a(say bottom) where the transaction begin.

I am doing all the fragment transaction in adapter of each item and code is like below.

Bundle arguments = new Bundle(); 
Fragment fragment = null; 
MyClass cls= (MyClass ) obj.get(position); 
arguments.putParcelable("single", offer); 
// Start a new fragment 
fragment = new DetailFragment(); 
fragment.setArguments(arguments); 
FragmentTransaction transaction = activity .getSupportFragmentManager().beginTransaction(); 
transaction.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right); 
transaction.replace(R.id.content_page_frame, fragment, OfferZoneDetailFragment.ARG_ITEM_ID); 
transaction.addToBackStack(DetailFragment.ARG_ITEM_ID); 
transaction.commit();

How to load the fragment transaction begin position when came back from other fragment.

Answer 1

I understand your problem. You can use

transaction.add(R.id.content_page_frame, fragment, OfferZoneDetailFragment.ARG_ITEM_ID); 

instead of

transaction.replace(R.id.content_page_frame, fragment, OfferZoneDetailFragment.ARG_ITEM_ID); 

May be, If it not solve your problem then use following mechanism, it will solve your problem:-

Check if your Fragment is already in your stack then attach already existing fragment.

else add new instanse of Frament.

use sacenario like this code :

android.support.v4.app.FragmentManager fm =   getSupportFragmentManager();
                AndroidFragment androidFragment = (AndroidFragment) fm.findFragmentByTag("android");
                AppleFragment appleFragment = (AppleFragment) fm.findFragmentByTag("apple");
                android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();

                /** Detaches the androidfragment if exists */
                if(androidFragment!=null)
                    ft.detach(androidFragment);

                /** Detaches the applefragment if exists */
                if(appleFragment!=null)
                    ft.detach(appleFragment);

                /** If current tab is android */
                if(tabId.equalsIgnoreCase("android")){

                    if(androidFragment==null){
                        /** Create AndroidFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new AndroidFragment(), "android");
                    }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(androidFragment);
                    }

                }else{    /** If current tab is apple */
                    if(appleFragment==null){
                        /** Create AppleFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new AppleFragment(), "apple");
                     }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(appleFragment);
                    }
                }
                ft.commit();

EDIT :

transaction.add will show the previous fragment on backpress and will not go through the fragment life cycle

For Reference see this onTabChanged : http://wptrafficanalyzer.in/blog/creating-navigation-tabs-using-tabhost-and-fragments-in-android/