I want to make this middle item as default selection when I open My application

CodePudding user response：

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);