Badge on BottomNavigationView

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You can use the BottomNavigationView provided by the Material Components Library.

Just add the BottomNavigationView to your layout:

  <com.google.android.material.bottomnavigation.BottomNavigationView
      android:layout_gravity="bottom"
      app:menu="@menu/navigation_main" 
      ../>

Then use in your code:

  int menuItemId = bottomNavigationView.getMenu().getItem(0).getItemId();
  BadgeDrawable badge = bottomNavigationView.getOrCreateBadge(menuItemId);
  badge.setNumber(2);

enter image description here

To change the badge gravity use the setBadgeGravity method.

badge.setBadgeGravity(BadgeDrawable.BOTTOM_END);

enter image description here

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