Fragment Field is NULL after rotate device in Android

Question

When I start the app everything works ok but when I rotate to landscape it crashes because in the Fragment there is a field that is NULL.

I don

Answer 1

this.mFragments = new ArrayList<>();

Because this is wrong. You should never hold a reference to the fragment list if you are using ViewPager. Just return new instance of Fragment from getItem(int position) of FragmentPagerAdapter and you are good to go.

But to fix your code, you must delete mFragments entirely.

See https://stackoverflow.com/a/58605339/2413303 for more details.