Android, Reusable Toolbar For Navigation - Where To Put Code?

I want to implement a toolbar for navigation which appears at the bottom of almost all activities in my app. It will have a fixed amout of elements (four). Screenshot: (certain a

Solution 1:

Make A Base activity, which will be extending by all your other activities. Write all your logic related to that toolbar on Base Activity. Thats all.

Solution 2:

You could use the TabLayout with ViewPager. Place them in main Activity, and use Fragment for every root screen.