android - Prevent dismissal of BottomSheetDialogFragment on touch outside

Question

I have implemented a BottomSheet Dialog and I want to prevent the bottomsheet from dismissing when the user touches outside of the bottomsheet when it's peeking (Not fully expanded state).

I have set dialog.setCanceledOnTouchOutside(false); in the code but it doesn't seem to take any affect.

Here's my BottomSheetDialogFragment class:

public class ShoppingCartBottomSheetFragment extends BottomSheetDialogFragment  {

    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {

        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                dismiss();
            }

        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };

    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);

        View contentView = View.inflate(getContext(), R.layout.fragment_shopping_cart_bottom_sheet, null);

        dialog.setCanceledOnTouchOutside(false);

        dialog.setContentView(contentView);

        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
        CoordinatorLayout.Behavior behavior = params.getBehavior();

        if( behavior != null && behavior instanceof BottomSheetBehavior ) {
            ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
            ((BottomSheetBehavior) behavior).setPeekHeight(97);
            ((BottomSheetBehavior) behavior).setHideable(false);
        }
    }


    @Override
    public void onStart() {
        super.onStart();
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams windowParams = window.getAttributes();
        windowParams.dimAmount = 0;
        windowParams.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;
        window.setAttributes(windowParams);
    }
}

According to the BottomSheet specification bottom sheets can be dismissed by touching outside of the bottom sheet, therefore what are my options to override this behavior and prevent it being dismissed?

Answer 1

You should use #setCancelable(false) when you create an instance of it.

    BottomSheetDialogFragment bottomSheetDialogFragment = new SequenceControlFragmentBottomSheet();
    bottomSheetDialogFragment.setCancelable(false);
    bottomSheetDialogFragment.show(getChildFragmentManager(), bottomSheetDialogFragment.getTag());