Tabs of TabLayout not showing

Question

I have a main activity, which hosts a fragment, which in turn hosts a TabLayout (with a ViewPager). The tab bar is shown, baut the tabs themselves are not shown.

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Answer 1

None of the other answers worked for me, I tried all of them

However, this one did: TabLayout not showing tabs after adding navigation bar

According to that answer, you have to enclose your TabLayout in a AppBarLayout. Why? Who knows. But at least it works.

Example Code (taken from that post):