Unable to see Tab Indicator in TabLayout design support library

Question

I am using Material design library and creating layout using CoordinatorLayout ,AppBarLayout ,RecyclerView and TabLayout .

My issu

Answer 1

I've just fixed this bug set background color programmatically

tabLayout.setBackgroundColor(getResources().getColor(R.color.primary));

or in xml

android:background="@color/primary"

But I don't know if there is any problem when you set background color this way