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Android

Matthew Lee
Matthew Lee
6,715 Points

Viewpager is blank when I replace the fragment inside it...

Hi,

I am trying to replace a fragment which is held inside a ViewHolder. However, when I replace it, the new fragment shows a blank view despite having binded the new layout...

How can I properly display the layout for the new fragment??

Thanks!

1 Answer

Seth Kroger
Seth Kroger
56,412 Points

Are you using the ViewPager with a FragmentPagerAdapter to handle the fragments? It has methods for updating/removing/inserting pages and much like ListAdapters needs to be notified of changes.

Matthew Lee
Matthew Lee
6,715 Points

Hi Seth,

Yes, I have a FragmentPagerAdapter and I am using a ViewPager to hold my fragment. My initial fragment is a RecylerView of images that uses an adapter. And in my adapter, I have an OnClickListener for the view. This is where I am replacing my fragment.

I've attached my code for the Adapter (where I make the transaction) as well as my FragmentPagerAdapter class.

        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(view.getContext(), "You clicked on the " + item.getItemTitle() + " at Position -> " + item.getPosition() + "!", Toast.LENGTH_SHORT).show();

                String name = item.getName();
                String id = item.getId();
                Log.e(TAG, "this is the name: "  + name + " and iD -> " + id);

                Bundle bundle = new Bundle();
                bundle.putString("AIRPORT_CODE", id);
                bundle.putString("AIRPORT_NAME",name);


                //create the new VendorFragment -> set Fragment Manager -> Transaction -> replace -> commit
                VendorFragment vendorFragment = new VendorFragment();
                vendorFragment.setArguments(bundle);


                FragmentManager fragmentManager = ((AppCompatActivity) view.getContext()).getFragmentManager();
                fragmentManager.executePendingTransactions();
                //Fragment currentFrag = fragmentManager.findFragmentById(c
                //FragmentManager childFM = currentFrag.getChildFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.replace(R.id.container, vendorFragment);


                fragmentTransaction.commit();



            }
        });
    }
public class SectionsPageAdapter extends FragmentPagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    public SectionsPageAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }



    @Override
    public int getCount() {
        return mFragmentList.size();
    }
}