How to update the List whenever the tabs are changing in view pager

Question

In my app i am using navigation tab using view pager. I have able to successfully drawn the tabs using the code posted on:

https://github.com/codepath/android_guides/wiki/Sliding-Tabs-with-PagerSlidingTabStrip

Here i have used the Sliding tab and view pager both to get the navigation tabs.Everything is working fine but the list are not getting updated when i am moving to the other tab. OnResume() is getting called even the Object list variable is also getting updated while debugging but visually list is not getting updated.

Here i am some snippets of the code:

For Tab1 : which in my case is ACTIVE tab

 @Override
    public void onResume() {
        super.onResume();

        if(!internetUtil.isConnectedToInternet(getActivity())){
            mSwipeRefreshLayout.setEnabled(false);
        }else{
            mSwipeRefreshLayout.setEnabled(true);
            new GetUsersFromServerTask().execute();  // Here i am making the network calls 
        }
}

On Tab2 : Which is Archive tab

 @Override
    public void onResume() {
        super.onResume();
        new GetUsersArchivedFromServerTask().execute(); // Network calls
    }

In MainActivity:

public class MaterialTab extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.material_main_sample);
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(new SampleFragmentPagerAdapter(getSupportFragmentManager()));
        PagerSlidingTabStrip tabsStrip = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        tabsStrip.setViewPager(viewPager);
        tabsStrip.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                if(position == 0){
                   ActiveFragment activeFragment = new ActiveFragment();
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.detach(activeFragment);
                    ft.attach(activeFragment);
                    ft.commit();
                } if(position == 1){
                    ArchiveFragment archiveFragment = new ArchiveFragment();
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.detach(archiveFragment);
                    ft.attach(archiveFragment);
                    ft.commit();
                }
            }
        });
    }
}

Also the thing is when i am doing SwipeRefresh then the List is getting updated. I am now totally confused why this behaviour. When i am swiping the tab the same methods are getting called and thelist is not getting updated but when I am doing SwipeRefresh it's getting Updated.

This is the Active Fragment:

public class ActiveFragment extends Fragment {

public void updateFragment(){
        new GetUsersArchivedFromServerTask().execute();
    }

 public class GetUsersArchivedFromServerTask extends AsyncTask<User, Void, String> {
        @Override
        protected String doInBackground(Shipment... parmas) {
            // Log.d(TAG, String.valueOf(shipmentDbHandler.getAllActiveShipments().size()));
            _userList1 = userDbHandler.getAllActiveUserByToday(DateTimeUtil.getCurrentTime());
            return "";
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(String str) {
            // Set the refresh Listener to false after the list has been loaded with new set of data
            if (mSwipeRefreshLayout.isRefreshing()) {
                mSwipeRefreshLayout.setRefreshing(false);
            }

            if(_userList1.size() == 0){
                ViewGroup parentOne = (ViewGroup) viewOne.getParent();
                if(parentOne != null){
                    parentOne.removeView(viewOne);
                }
            }

            if(_shipmentList1.size() > 0 ){
                mShipmentAdapter = new ShipmentAdapter(getActivity(),_userList1,1); 
                shipmentListView1.setAdapter(mShipmentAdapter);
                setListViewHeightBasedOnChildren(shipmentListView1);
                ViewGroup parentOne = (ViewGroup) viewOne.getParent();
                if(parentOne == null){
                    mainLayoutOne.addView(viewOne);
                }

                mShipmentAdapter.notifyDataSetChanged();
            }
            mSwipeRefreshLayout.setClickable(true);
        }
    }
}   

Answer 1

PLease use FragmentStatePagerAdapter for that.