How do I get the bottom navigation bar height for Material Design 3?

Question

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?

Ryan Payne · Accepted Answer · 2022-05-03 14:28:30Z

2

With Material3 the BottomNavigationView has a different minHeight.
You can apply something like:

 <fragment android:layout_marginBottom="@dimen/m3_bottom_nav_min_height"

Reference: android/material/bottomnavigation/res/values/dimens.xml#L32

edited May 3, 2022 at 14:28

Ryan Payne

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answered May 3, 2022 at 7:57

Gabriele Mariotti

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2 Comments

Ryan Payne Over a year ago

Thank you! That works. However, when I do use that value, it says it's private: "The resource @dimen/m3_bottom_nav_min_height is marked as private in com.google.android.material:material:1.5.0". Is that going to create any issues?

Gabriele Mariotti Over a year ago

@RyanPayne No, it is only a warning.

Gokul Nath KP · Accepted Answer · 2022-04-29 19:57:35Z

Maybe you can try to get the height programmatically and set margin bottom dynamically during runtime?

Resources resources = context.getResources(); int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android"); if (resourceId > 0) { navBar.getLayoutParams().height = resources.getDimensionPixelSize(resourceId); }

Refer here and here for more info.

When I log this value I get 44. The value of ?android:attr/actionBarSize is 56. It needs to be larger than 56.

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