The following behavior only shows during run time
Image Showing unwanted bottom navigation view behavior
the xml code for the above is:
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav_bar"
android:layout_width="0dp"
android:background="#92000000"
android:layout_height="70dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_nav_bar_menu" />
create a drawable resource file with a transparent rectangle and use it as view background
transparent_rectangle.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#92000000" />
</shape>
and your view should be
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav_bar"
android:layout_width="0dp"
android:background="@drawable/transparent_rectangle"
android:layout_height="70dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_nav_bar_menu" />