PublisherAdView is causing RecyclerView (any scrollable view) to shift?

Recently the 9GAG Android app has integrated PublisherAdView to post list. We found a strange bug that the list( RecyclerView ) will shift when we scroll to those PublisherAdView and perform tab changes in ViewPager. We switch from tab 1 and then to tab 2 and then back to tab 1. The list will be shifted, it looks as if the advertisement is trying to put it to a visible position! (Smart, huh?)

Demonstration:

After some investigation, and we found this StackOverflow question.

It’s because PublisherAdView is a WebView under the hood, and WebView itself will trigger a focus request. In the question, the answer is to add android:focusableInTouchMode="true" attribute, however, this will make the LinearLayout focusable, which doesn’t solve the issue.

Solution is simple, we used this attribute android:descendantFocusability="beforeDescendants" to its parent view. 🎉 That solves the issue immediately! This trick should applies to any scrollable views (RecyclerView, ListView and ScrollView)

Example layout: