Set initially selected item index/id in BottomNavigationView

Set the selected menu item ID using setSelectedItemId:

bottomNavigationView.setSelectedItemId(R.id.item_id);

This method started being available from Android Support Library 25.3.0.

The only solution that worked for me is:

View view = bottomNavigationView.findViewById(R.id.menu_action_dashboard);
view.performClick();

Simply performing click does the trick. Hope we'll get extra methods/properties in future releases.

UPD:

As user5968678 mentioned, a new method was added since Android Support Library v25.3.0:

bottomNavigationView.setSelectedItemId(R.id.item_id);

so use this instead :)

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