Disable dragging of BottomSheetDialogFragment with scrollable children

Question

Is it possible to disable dragging for a BottomSheetDialogFragment, containing scrollable views such as a ViewPager or a NestedScrollView,

Answer 1

If you debug your application and use Layout Inspector tool, you will see that BottomSheetDialogFragment uses CoordinatorLayout. Dimmed background is a simple view with an OnClickListener that closes the dialog, and sheet movement is driven by CoordinatorLayout.Behavior.

This can be overriden by modifying created dialog:

Java:

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog d = super.onCreateDialog(savedInstanceState);
    // view hierarchy is inflated after dialog is shown
    d.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialogInterface) {
            //this disables outside touch
            d.getWindow().findViewById(R.id.touch_outside).setOnClickListener(null);
            //this prevents dragging behavior
            View content = d.getWindow().findViewById(R.id.design_bottom_sheet);
            ((CoordinatorLayout.LayoutParams) content.getLayoutParams()).setBehavior(null);
        }
    });
    return d;
}

Kotlin:

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val d = super.onCreateDialog(savedInstanceState)
    //view hierarchy is inflated after dialog is shown
    d.setOnShowListener {
        //this disables outside touch
        d.window.findViewById<View>(R.id.touch_outside).setOnClickListener(null)
        //this prevents dragging behavior
        (d.window.findViewById<View>(R.id.design_bottom_sheet).layoutParams as CoordinatorLayout.LayoutParams).behavior = null
    }
    return d
}

This does use internal IDs of design library, but unless for some reason they're changed this should be stable.