BottomNavigationView - How to get selected menu item?

Question

I used BottomNavigationView to switch fragments. How to get currently selected menu item, to prevent reopening fragment ?

        BottomNavigationView bottomNavigationView = (BottomNavigationView)
                findViewById(R.id.bottom_navigation);

        bottomNavigationView.setOnNavigationItemSelectedListener(
                new BottomNavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                        switch (item.getItemId()) {
                            case R.id.action_1:
                                // open fragment 1
                                break;
                            case R.id.action_2:
                                // open fragment 2
                                break;
                            case R.id.action_3:
                                // open fragment 3
                                break;
                        }
                        return false;
                    }
                });
    }

Can you be more clear about ' prevent reopening fragment'? What do you expect on Navigation Item (Menu) click? — Suhayl SH, Jan 04 '17 at 08:17

score 28 · Answer 1 · edited Dec 23 '17 at 16:58

28

Get selected item at first and then getMenu().findItem(int itemId)

bottomNavigationView.getMenu().findItem(bottomNavigationView.getSelectedItemId())

edited Dec 23 '17 at 16:58

Ghasem

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answered Apr 28 '17 at 11:05

Kirill Vashilo

1,559
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27

score 11 · Accepted Answer · edited Feb 01 '19 at 11:35

11

Solution:

private int getSelectedItem(BottomNavigationView bottomNavigationView) {
    Menu menu = bottomNavigationView.getMenu();
    for (int i = 0; i < bottomNavigationView.getMenu().size(); i++) {
        MenuItem menuItem = menu.getItem(i);
        if (menuItem.isChecked()) {
            return menuItem.getItemId();
        }
    }
    return 0;
}

edited Feb 01 '19 at 11:35

logoff

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answered Jan 04 '17 at 08:25

phnmnn

12,813
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64

user5968678 · Answer 3 · 2017-10-08T09:26:44.680

9

Get the currently selected menu item ID using getSelectedItemId:

int selectedItemId = bottomNavigationView.getSelectedItemId();
MenuItem selectedItem = bottomNavigationView.getMenu().findItem(selectedItemId);

This method started being available from Android Support Library 25.3.0.

edited Oct 08 '17 at 09:26

answered Apr 07 '17 at 12:58

user5968678

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17

score 2 · Answer 4 · answered Jul 26 '18 at 10:33

I think the simplest solution for checking if the previous item is the next item is this:

BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);

bottomNavigationView.setOnNavigationItemSelectedListener(
    new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            final int previousItem = bottomNavigationView.getSelectedItemId();
            final int nextItem = item.getItemId();
            if (previousItem != nextItem) {
                 switch (nextItem) {
                     case R.id.action_1:
                         // open fragment 1
                         break;
                     case R.id.action_2:
                         // open fragment 2
                         break;
                     case R.id.action_3:
                         // open fragment 3
                         break;
                 }
            }
            return true;
        }
    }
);

Note that there is no need for iterating, and that onNavigationItemSelected returns true, because the function consumes the event.

I hope it helps someone.

BottomNavigationView - How to get selected menu item?

4 Answers4

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