I've styled my app using Material Design 3 and I'm using a bottom navigation bar.

<!-- activity_main.xml --> <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" app:defaultNavHost="true" app:layout_constraintBottom_toTopOf="@id/bottom_navigation" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:navGraph="@navigation/nav_graph" tools:ignore="FragmentTagUsage" /> <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bottom_navigation" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="0dp" android:layout_marginEnd="0dp" android:background="?android:attr/windowBackground" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:menu="@menu/bottom_navigation_menu" /> </androidx.constraintlayout.widget.ConstraintLayout> 

I've added a floating action button (FAB).

<com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/add_a_vehicle_fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="16dp" android:contentDescription="@string/fab_content_description" app:srcCompat="@drawable/ic_baseline_add_24" /> 

However, the FAB is obscured behind the navigation bar.

I've tried to solving the issue by adding margin to the fragment following: How to get the ActionBar height?.

<fragment android:id="@+id/nav_host_fragment" .... android:layout_marginBottom="?android:attr/actionBarSize" ... /> 

However, that height is from the Material Design 2 bottom navigation bar and my FAB gets cut off because it's not enough margin.

How do I obtain the height of the Material Design 3 bottom navigation bar so I can display my FAB correctly?

I'm using a Material Design 3 bottom navigation bar.

<!-- activity_main.xml --> <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" app:defaultNavHost="true" app:layout_constraintBottom_toTopOf="@id/bottom_navigation" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:navGraph="@navigation/nav_graph" tools:ignore="FragmentTagUsage" /> <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bottom_navigation" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="0dp" android:layout_marginEnd="0dp" android:background="?android:attr/windowBackground" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:menu="@menu/bottom_navigation_menu" /> </androidx.constraintlayout.widget.ConstraintLayout> 

I've added a floating action button (FAB).

<com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/add_a_vehicle_fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="16dp" android:contentDescription="@string/fab_content_description" app:srcCompat="@drawable/ic_baseline_add_24" /> 

However, the FAB is obscured behind the navigation bar.

I've tried to solving the issue by adding margin to the fragment following: How to get the ActionBar height?.

<fragment android:id="@+id/nav_host_fragment" .... android:layout_marginBottom="?android:attr/actionBarSize" ... /> 

However, that height is from the Material Design 2 bottom navigation bar and my FAB gets cut off because it's not enough margin.

How do I obtain the height of the Material Design 3 bottom navigation bar so I can display my FAB correctly?