我希望DateRangepicker是默认的选定范围。 我怎么能得到那个？

我现在的代码:

            CalendarConstraints.Builder constraintBuilder = new CalendarConstraints.Builder();
            constraintBuilder.setValidator(DateValidatorPointForward.now());

            MaterialDatePicker.Builder builder = MaterialDatePicker.Builder.dateRangePicker();
            builder.setCalendarConstraints(constraintBuilder.build());

            final MaterialDatePicker materialDatePicker = builder.build();

            imageDate.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    materialDatePicker.show(getSupportFragmentManager(), "TAG");
                }
            });