ValCanBuild

class BottomNavigationBehavior<V : View>(context: Context, attrs: AttributeSet) :
    CoordinatorLayout.Behavior<V>(context, attrs) {

    @NestedScrollType
    private var lastStartedType: Int = 0
    private var offsetAnimator: ValueAnimator? = null
    var isSnappingEnabled = false

    // rest of the code

ValCanBuild

@Override
public void onStopNestedScroll(
    CoordinatorLayout coordinatorLayout, T abl, View target, int type) {
    // onStartNestedScroll for a fling will happen before onStopNestedScroll for the scroll. This
    // isn't necessarily guaranteed yet, but it should be in the future. We use this to our
    // advantage to check if a fling (ViewCompat.TYPE_NON_TOUCH) will start after the touch scroll
    // (ViewCompat.TYPE_TOUCH) ends
    if (lastStartedType == ViewCompat.TYPE_TOUCH || type == ViewCompat.TYPE_NON_TOUCH) {
        // If we haven't been flung, or a fling is ending
        snapToChildIfNeeded(coordinatorLayout, abl);

ValCanBuild

class BottomNavigationFABBehavior(context: Context?, attrs: AttributeSet?) : CoordinatorLayout.Behavior<View>(context, attrs) {

    override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
        return dependency is Snackbar.SnackbarLayout
    }

    override fun onDependentViewRemoved(parent: CoordinatorLayout, child: View, dependency: View) {
        child.translationY = 0f
    }

ValCanBuild

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:src="@drawable/ic_add_black_24dp"
        app:fabSize="normal"
        app:layout_anchor="@id/navigation"
        app:layout_anchorGravity="top|end"
        app:useCompatPadding="true"/>

ValCanBuild

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:src="@drawable/ic_add_black_24dp"
        app:fabSize="normal"
        app:layout_anchor="@id/navigation"
        app:layout_anchorGravity="top|end"
        app:layout_behavior="com.mypackage.BottomNavigationFABBehavior"

ValCanBuild

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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"
    >

    <android.support.design.widget.AppBarLayout

ValCanBuild

/**
MIT License

Copyright (c) 2018 Valentin Hinov

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is

ValCanBuild

class BottomNavigationBehavior<V : View>(context: Context, attrs: AttributeSet) :
    CoordinatorLayout.Behavior<V>(context, attrs) {
        
    // Rest of the code is the same    

    override fun layoutDependsOn(parent: CoordinatorLayout?, child: V, dependency: View?): Boolean {
        if (dependency is Snackbar.SnackbarLayout) {
            updateSnackbar(child, dependency)
        }
        return super.layoutDependsOn(parent, child, dependency)

ValCanBuild

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    app:layout_behavior="com.mypackage.BottomNavigationBehavior"
    app:menu="@menu/my_menu"/>

ValCanBuild

class BottomNavigationBehavior<V : View>(context: Context, attrs: AttributeSet) :
    CoordinatorLayout.Behavior<V>(context, attrs) {

    override fun onStartNestedScroll(
        coordinatorLayout: CoordinatorLayout, child: V, directTargetChild: View, target: View, axes: Int, type: Int
    ): Boolean {
        return axes == ViewCompat.SCROLL_AXIS_VERTICAL
    }

    override fun onNestedPreScroll(