Bottom Align Floating Action Button

For RelativeLayout:

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    ... />

For CoordinatorLayout, you should use android:layout_gravity="end|bottom"


For ConstraintLayout:

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    ... />

See this answer for more information.

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