The [BottomSheetDialog](<https://developer.android.com/reference/android/support/design/widget/BottomSheetDialog.html>) is a dialog styled as a bottom sheet

Just use:

//Create a new BottomSheetDialog
BottomSheetDialog dialog = new BottomSheetDialog(context);
//Inflate the layout R.layout.my_dialog_layout
dialog.setContentView(R.layout.my_dialog_layout);
//Show the dialog
dialog.show();

In this case you don’t need to attach a BottomSheet behavior.