ActionBar in Android overrides the BottomNavigation-CodePudding

When trying to change an icon to a downloaded drawable (or actually changing to any other icon during runtime), the icon changes once on the ActionBar.

I actually want to remove the ActionBar and leave only the bottomnav (tabs) for navigation, yet whatever i'm doing the icon changes only on the ActionBar.

The item inside bottom_nav_menu.xml:

    <item
    android:id="@ id/navigation_notifications"
    android:icon="@drawable/ic_dashboard_black_24dp"
    android:title="@string/title_notifications"
    app:showAsAction="ifRoom"/>

The code that changes the icon:

@Override
public boolean onPrepareOptionsMenu (Menu menu){
    menu.clear();
    getMenuInflater().inflate(R.menu.bottom_nav_menu, menu);
    menu.getItem(2).setIcon(this.bitmap_pic);

    Log.e(TAG, "Icon Changed");
    return super.onPrepareOptionsMenu(menu);
}

The result - Icon stays blank on BottomNav but appears on the ActionBar.

Expected result: BottomNav icon will be the image that shown on the top right.

Thanks

EDIT!

Issue was fixed after inflating the main_activity layout that contains the BottomNavView

Now the problem the picture isn't showing properly, attached a screenshot (Image is grey instead of showing the icon like in the ActionBar in the first picture):

Edit 2

Icon is still grey instead of showing the bitmap picture. Added:

MenuItemCompat.setIconTintMode(bottomNavigationView.getMenu().getItem(2), PorterDuff.Mode.CLEAR);

But it still shows up like in the picture below

Edit 3

Fixed the issue using:

        bottomNavigationView.setItemIconTintList(null);

CodePudding user response：

I'm not sure if onPrepareOptionsMenu invoked for bottom navigation bar.

You should have to update navigation menu icon from onCreate method of that Activity.

Refer below code,

val menu = navigation.menu
val menuItem = menu.findItem(R.id.navigation_notifications) // find particular menu-item using its ID.
menuItem?.icon = this.bitmap_pic

Solution for Gray icon tint, add below line.

MenuItemCompat.setIconTintMode(menuItem, PorterDuff.Mode.DST)