Issue
I want to make this middle item as default selection when I open My application
Solution
write the code in onCreate method. remember dont write in mBottomNavigationView.setOnNavigationItemSelectedListener{}
BottomNavigationView mBottomNavigationView=(BottomNavigationView)findViewById(R.id.bottom_nav);
mBottomNavigationView.getMenu().findItem(R.id.item_id).setChecked(true);
Answered By - Niaj Mahmud
Answer Checked By - David Goodson (JavaFixing Volunteer)