android hide and show bottom navigation
public class BottomNavigationViewBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> { private int height; @Override public boolean onLayoutChild(CoordinatorLayout parent, BottomNavigationView child, int layoutDirection) { height = child.getHeight(); return super.onLayoutChild(parent, child, layoutDirection); } @Override public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, BottomNavigationView child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) { return axes == ViewCompat.SCROLL_AXIS_VERTICAL; } @Override public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull BottomNavigationView child, @NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, @ViewCompat.NestedScrollType int type) { if (dyConsumed > 0) { slideDown(child); } else if (dyConsumed < 0) { slideUp(child); } } private void slideUp(BottomNavigationView child) { child.clearAnimation(); child.animate().translationY(0).setDuration(200); } private void slideDown(BottomNavigationView child) { child.clearAnimation(); child.animate().translationY(height).setDuration(200); }