How to get previous and next day's dates in android?

Question

I created a layout with three Buttons. My idea is to use these three buttons as a datepicker. Those three buttons are -,Today,+. If I press the today button displays today's date. When I press - it displays yesterdays date. If I press + it displays tomorrow's date. No problem. But it only works once. My requirement is to as long as I press - it has to display previous day's dates i.e 19-Aug-2015,18-Aug-2015,17-Aug-2015,etc., My code is

 imgtoday.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            googleMap.clear();
            Date date1=new Date(System.currentTimeMillis());
            SimpleDateFormat sdf=new SimpleDateFormat("dd-MMM-yyyy");
            String date=sdf.format(date1);
            drawRoute(date);
            imgHistory.setClickable(false);
            imgHistory.setBackgroundResource(R.drawable.btn_disabled);
            calculateDistance(date);
        }
    });

    previousDay=(Button)findViewById(R.id.button9);
    nextDay=(Button)findViewById(R.id.button11);

    previousDay.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            googleMap.clear();
            Date date1=new Date(System.currentTimeMillis() - (1000 * 60 * 60 * 24));
            SimpleDateFormat sdf=new SimpleDateFormat("dd-MMM-yyyy");
            String date=sdf.format(date1);
            drawRoute(date);
            calculateDistance(date);
        }
    });

    nextDay.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            googleMap.clear();
            Date date1=new Date(System.currentTimeMillis() + (1000 * 60 * 60 * 24));
            SimpleDateFormat sdf=new SimpleDateFormat("dd-MMM-yyyy");
            String date=sdf.format(date1);
            drawRoute(date);
            calculateDistance(date);
        }
    });

Anyone please help. Thanks.

Answer 1

Use Calendar:

Calendar cal = Calendar.getInstance(); 
cal.setTime(TODAY); 
cal.add(Calendar.DAY_OF_MONTH, 1); //Adds a day
cal.add(Calendar.DAY_OF_MONTH, -1); //Goes to previous day
yourDate = cal.getTime();

Answer 2

Here is my code I have used for increment and decrement dates

/**
 * Get next date from current selected date
 *
 * @param date date
 */
public Date incrementDateByOne(Date date) {
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    c.add(Calendar.DATE, 1);
    Date nextDate = c.getTime();
    return nextDate;
}

/**
 * Get previous date from current selected date
 *
 * @param date date
 */
public Date decrementDateByOne(Date date) {
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    c.add(Calendar.DATE, -1);
    Date previousDate = c.getTime();
    return previousDate;
}

I hope it helps!