Disable previous time if min time set in android RangeTimePickerDialog Marshmallow

Question

I want to disable previous times. The user shouldn't be able to click on previous times. I have used a normal TimePickerDialog but it didn't help. After a lots of R&D, I got RangeTimePickerDialog code to implement range factor but it still doesn't disable in Marshmallow.

This is my RangeTimePickerDialog code:

public class RangeTimePickerDialog extends TimePickerDialog {

    private int minHour = -1;
    private int minMinute = -1;

    private int maxHour = 25;
    private int maxMinute = 25;

    private int currentHour = 0;
    private int currentMinute = 0;

    private Calendar calendar = Calendar.getInstance();
    private DateFormat dateFormat;

    public RangeTimePickerDialog(Context context, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView) {

        super(context, callBack, hourOfDay, minute, is24HourView);
        currentHour = hourOfDay;
        currentMinute = minute;
        dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT);

        try {
            Class<?> superclass = getClass().getSuperclass();
            Field mTimePickerField = superclass.getDeclaredField("mTimePicker");
            mTimePickerField.setAccessible(true);
            TimePicker mTimePicker = (TimePicker) mTimePickerField.get(this);
            mTimePicker.setOnTimeChangedListener(this);
        } catch (NoSuchFieldException e) {
        } catch (IllegalArgumentException e) {
        } catch (IllegalAccessException e) {
        }
    }

    public void setMin(int hour, int minute) {
        minHour = hour;
        minMinute = minute;
    }

    public void setMax(int hour, int minute) {
        maxHour = hour;
        maxMinute = minute;
    }

    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {

        boolean validTime = true;
        if (hourOfDay < minHour || (hourOfDay == minHour && minute < minMinute)){
            validTime = false;
        }

        if (hourOfDay  > maxHour || (hourOfDay == maxHour && minute > maxMinute)){
            validTime = false;
        }

        if (validTime) {
            currentHour = hourOfDay;
            currentMinute = minute;
        }

        updateTime(currentHour, currentMinute);
        updateDialogTitle(view, currentHour, currentMinute);
    }

    private void updateDialogTitle(TimePicker timePicker, int hourOfDay, int minute) {
        calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
        calendar.set(Calendar.MINUTE, minute);
        String title = dateFormat.format(calendar.getTime());
        setTitle(title);
    }
}