FragmentGallery.java

        AdapterView.OnItemClickListener myOnItemClickListener = new AdapterView.OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                FragmentViewPager fragment = new FragmentViewPager();
                Bundle args = new Bundle();
                args.putInt(FragmentGalleryViewPager.BUNDLE_STATE_POSITION, position);
                args.putString(FragmentGalleryViewPager.BUNDLE_STATE_SELECTION, selection);
                fragment.setArguments(args);
                FragmentTransaction transaction = getFragmentManager().beginTransaction();

                transaction.replace(R.id.content_frame, fragment);
                transaction.addToBackStack(null);
                transaction.commit();
            }};