在 Android 中隐藏/显示 ViewPager

Question

I have this app structure:

1. MainActivity with a global menu and Fragment container.
2. First Fragment : a ViewPager with three pages.
3. Second Fragment : a list

I insert the Fragment s on the OnCreate() in the MainActivity and change their visibility with show and hide (using the FragmentTransaction ).

When I launch the app the first Fragment appear in the screen without problem, when change to the second Fragment also work like a charm but when I come back to the first Fragment the app doesn't show anything inside the ViewPager .

Are there any particular option that I have to change in the ViewPager to solve this?

Answer 1

The problem seems due to that android does not allow to have nested fragments. In my case I can manage the situation using simple views instead of fragments inside the ViewPager.

Answer 2

I used ViewStub to show/hide ViewPager.

The basic idea was you created ViewStub in layout file, and inflate/setVisible while necessary.

The only trick was, I had to setAdatper to null otherwise it crashed while re-createView when off and on screen.

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

    viewPager.setAdatper(null);
}