ViewPage Fragment disappear when reload again

Question

The following is layout

test.xml

Answer 1

In PagerFragment 's onResume() add this:

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

    for (Fragment fragment : getFragmentManager().getFragments()) {
        if (fragment instanceof Tab1Fragment || fragment instanceof Tab2Fragment) {
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.detach(fragment);
            ft.attach(fragment);
            ft.commit();
        }
    }
}