How to determine when Fragment becomes visible in ViewPager

Question

Problem: Fragment `onResume()` in `ViewPager` is fired before the fragment becomes actually visible. For example, I have 2 fragments with `ViewPager` and `FragmentPagerAdapter`. The second fragment is only available for authorized users and I need to ask the user to log in when the fragment becomes visible (using an alert dialog). BUT the `ViewPager` creates the second fragment when the first is visible in order to cache the second fragment and makes it visible when the user starts swiping. So the `onResume()` event is fired in the second fragment long before it becomes visible. That's why I'm trying to find an event which fires when the second fragment becomes visible to show a dialog at the appropriate moment. How can this be done?

Accepted Answer

You can do the following by overriding `setUserVisibleHint` in your `Fragment`:

```
public class MyFragment extends Fragment {
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
        }
        else {
        }
    }
}
```

How to determine when Fragment becomes visible in ViewPager

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