onSlide.java

@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
  if(slideOffset > 0) //Sliding happens from 0 (Collapsed) to 1 (Expanded) - if so, calculate margins
    buttonLayoutParams.topMargin = (int) (((expandedHeight - buttonHeight) - collapsedMargin) * slideOffset + collapsedMargin);
  else //If not sliding above expanded, set initial margin
    buttonLayoutParams.topMargin = collapsedMargin;
  binding.sheetButton.setLayoutParams(buttonLayoutParams); //Set layout params to button (margin from top)
}