How to programmatically change Bottom Navigation View's Icons?

Question

I want know how can I change Bottom Navigation View's Icons when user basically selects it and then again replace it with previous icon if user selects different option.

Below is my switch case snippet.

switch (menuItem.getItemId()) {

            case R.id.ic_home:

                selectedFragment = new HomeFragment();

                //menuItem.setIcon(R.drawable.like_colored);

                break;

            case R.id.ic_connect:

                selectedFragment = new ConnectionFragment();

                break;

            case R.id.ic_add:

                selectedFragment = new AddPostFragment();

                break;

            case R.id.ic_noti:

                selectedFragment = new NotificationFragment();

                break;

            case R.id.ic_profile:

                selectedFragment = new ProfileFragment();

                break;

Answer 1

This will change the icon and text color of a single menu item from anywhere (e.g. onResume). The code below works fine on 4.4.2 through (at least) Pie. It's bits and pieces from here and other similar threads. Some notes:

1. The menu item's icon is a drawable called "icon", but it doesn't work quite right to simply change that like I do the text color - sometimes the icon (if any) in the xml appears instead. This seems to always work.
2. It's written to be a static function so it's callable from multiple fragments; you could easily make it a member and strip out the activity argument in an activity class.
3. The drawable depends on whether it's a vector or a bitmap drawable for older APIs: bit map (and new API) code is a comment; newer APIs don't need the specific vector drawable function.

    static public void setMenuItemProperties(AppCompatActivity activity,
                                             MenuItem item,
                                             int resIconDrawable, int resColor) {
        int id = item.getItemId();

        BottomNavigationItemView m = activity.findViewById(id);
        TextView t1 = m.findViewById(R.id.smallLabel);
        TextView t2 = m.findViewById(R.id.largeLabel);
        t1.setTextColor(activity.getResources().getColor(resColor));
        t2.setTextColor(activity.getResources().getColor(resColor));

        Drawable d = VectorDrawableCompat.create(activity.getResources(), resIconDrawable, null);
        //Drawable d = activity.getResources().getDrawable(resIconDrawable);
        item.setIcon(d);
    }

Call like this (from an Activity) to select between two icons and text colors for menu item 3. (navigation is the BottomNavigationView.)

      setMenuItemProperties(this, navigation.getMenu().getItem(3),
          enabled ? R.drawable.ic_settings_red_24dp : R.drawable.ic_settings_redish_24dp,
          enabled ? android.R.color.white : R.color.medium_dark_grey);