First 10 minutes of the call were conceptual Android questions:

1. When would an Activity be destroyed?
2. How do you open another Activity?
3. How do you pass data between the two Activities?
4. What happens to the back stack when you switch between activities?
5. What are different ways to store data?

Then asked two coding problems:
https://leetcode.com/problems/odd-even-linked-list/
https://leetcode.com/problems/remove-duplicates-from-sorted-array/