Android set DatePicker to a certain date

Question

I have 3 strings containing day, month and year values. For example:

String mday = "02";
String mmonth="07";
String myear="2013";

I need to set the DatePicker in my activity to a month from the date above. I do not mean just add 1 to the mmonth value... in case of day 31 I would end up with an invalid date. So I need some way to increment the date (the valid way) and set the DatePicker with it's value. I am aware that setting the datePicker with Int values is done like this:

DatePicker datepicker = (DatePicker) findViewById(R.id.datePicker1); 
datepicker.init(iYear, iMonth, iDay, null); 
// where iYear,iMonth and iDay are integers

But how do I obtain the integer values of day,month and year of an incremented DATE by one month?

So between the first values (strings) and final values of incremented date(integers) what are the steps that I must make?

I assume I would have to use a Calendar. So my code should look like this:

Integer iYear, iMonth, iDay = 0;
String mday = "02";
String mmonth="07";
String myear="2013";

Calendar cal = Calendar.getInstance();
cal.set(Integer.parseInt(myear), Integer.parseInt(mmonth), Integer.parseInt(mday));
cal.add(Calendar.MONTH, 1);
// here I should get the values from cal inside the iYear, iMonth, iDay, but I do not seem to succeed.

DatePicker datepicker = (DatePicker) findViewById(R.id.datePicker1); 
datepicker.init(iYear, iMonth, iDay, null); 

if I do:

datepicker.init(cal.YEAR, cal.MONTH, cal.DATE, null);

then application crashes. What should I do? How to set this incremented by a month date into my DatePicker?

UPDATE I changed my test code to this:

    Calendar cal = Calendar.getInstance();
    cal.set(2013, 05, 23);
    cal.add(Calendar.MONTH, 1);

    int xxday = cal.get(Calendar.DATE);
    int xxmonth = cal.get(Calendar.MONTH);
    int xxyear = cal.get(Calendar.YEAR);

    datepicker.init(xxyear, xxmonth, xxday, null);

but Now the datePicker is set to one month from NOW instead of one month from the wanted date So instead of (2013-06-23) I have (2013-09-23). I assume it's because of

    int xxmonth = cal.get(Calendar.MONTH);

how can I get the real month from a Calendar cal; ?

Solution 1

DatePicker class has a method updateDate(year, month, dayOfMonth) which you can use to set a date in your DatePicker as shown below:

DatePicker datePicker = (DatePicker) findViewById(R.id.datePicker1);
datePicker.updateDate(2016, 5, 22);

Solution 2

Calendar month is 0 based. So month 07 is August.

Solution 3

Use the following code to initialize the calendar object if you have a date picker:

Calendar calendar = new GregorianCalendar(datePicker.getYear(),
                               datePicker.getMonth(),
                               datePicker.getDayOfMonth());

Else hard-code the date parts in the constructor

Solution 4

use this tuto to create your DatePickerDialog then use this code inside DatePickerDialog https://developer.android.com/guide/topics/ui/dialogs.html

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    String mday = "02";
    String mmonth="07";
    String myear="2013";
    //convert them to int
    int mDay=Integer.valueOf(mday);
    int mMonth=Integer.valueOf(mmonth);
    int mYear=Integer.valueOf(myear);

    return new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
            String d=convertToCompletDate(i2,i1,i);
            mListener.onDatePicked(d);

        }
    },mYear,mMonth,mDay);
}

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