Circular ViewPager. Fragments don't work as they supposed to after first round

Question

Ok, so i needed circular ViewPager. I was having really hard time to implement it. Now that i have implemented it and it is working fine as far as circular scroll is concern

Answer 1

I've created a simple test-app with you PagerAdapter and simple Fragments with a Button:

And it works fine!

I've uploaded the source code here, so you can check it out and see if there's any difference with yours.

As a Fragment's I used:

public class FragmentA extends android.support.v4.app.Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_a, container, false);
        rootView.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Snackbar.make(v, "Hi, fragment A", Snackbar.LENGTH_SHORT).show();
            }
        });
        return rootView;
    }
}

So what I can recommend

• replace your fragments with some dummy ones (like the one above). If it works - the issue is in the Fragment code, not in the Circular ViewPager

• If it still doesn't work - I'd try to instead of re-creating fragments multiple times - create them once and store:

   public class PagerAdapter extends FragmentPagerAdapter {
      Context mcontext;
      Fragment [] fragments;
      public PagerAdapter(FragmentManager fm, Context context, Fragment [] fragments) {
          super(fm);
          mcontext = context;
          this.fragments = fragments;
      }
  
      @Override
      public Fragment getItem(int position) {
          return fragments[position];
      }
  
      @Override
      public int getCount() {
          return fragments.length;
      }
  }
  

  And in Activity:

  Fragment[] fragments = {
          Fragment.instantiate(this, FragmentC.class.getName()),
          Fragment.instantiate(this, FragmentA.class.getName()),
          Fragment.instantiate(this, FragmentB.class.getName()),
          Fragment.instantiate(this, FragmentC.class.getName()),
          Fragment.instantiate(this, FragmentA.class.getName()),
  };
  .....
  viewPager.setAdapter(new PagerAdapter(getSupportFragmentManager(), this, fragments));
  

Let me know, if it helps!