dorianpavetic

public class MainActivity extends AppCompatActivity {

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

dorianpavetic

<?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">

    <Button
        android:id="@+id/button_open_dialog"

dorianpavetic

<?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:id="@+id/sheet_constraint_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="6dp"
    android:paddingStart="10dp"

dorianpavetic

private void setupRatio(BottomSheetDialog bottomSheetDialog) {
        FrameLayout bottomSheet = bottomSheetDialog.findViewById(R.id.design_bottom_sheet);
        if(bottomSheet == null)
            return;

        //Retrieve button parameters
        buttonLayoutParams = (ConstraintLayout.LayoutParams) binding.sheetButton.getLayoutParams();

        //Retrieve bottom sheet parameters
        BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_COLLAPSED);

dorianpavetic

@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)
}