Pfthb

I have a silly beginner question.
I am using the Andriod datepicker to do some data entry. Overall I want to store and retrieve data from a firestore db.
But currently I am struggling with with Calendar and datepicker. The last method (updateDatepickerFromCalendar) is used to update the datapicker with the new data once retrieved. You will not find that one ... but I added a tempory Calendar object which also fails.

The other way around to update the Calendar object from the date picker works perfekt. But if I want to update the date picker from the Calendar object it seams that the calendar object is not handed to the method updateDatepickerFromCalendar while the datepicker object is.

Any Idea what I am doing wrong?

 // retrieve data
 ladeknopf.setOnClickListener( (View v) -> 
 eingabename.setText(datensatz.getNameDerPerson());
 Calendar testDatum; // just for testing
 testDatum = Calendar.getInstance();
 testDatum.set(1999,11,2);
 updateDatepickerFromCalendar(testDatum, eingabedatum);
 eingabeueberbblick.setText(datensatz.valuesToString());

 );
}

// Datepicker Hilfsmethoden
// calendar object mit Daten aus Datepicker
private void updateCalendarFromDatepicker(Calendar cal3, DatePicker dp)
 cal3.set(Calendar.YEAR, dp.getYear());
 cal3.set(Calendar.MONTH, dp.getMonth());
 cal3.set(Calendar.DAY_OF_MONTH, dp.getDayOfMonth());


// here is the issue: pb is handed over but the Calendar Object not
private void updateDatepickerFromCalendar(Calendar cal2, DatePicker dp) 
 dp.updateDate(cal2.YEAR, cal2.MONTH, cal2.DAY_OF_MONTH);

Thank you in advance.

This example can help you.

DatePickerDialog datePickerDialog = new DatePickerDialog[1];
Calendar c = Calendar.getInstance();
 int mYear = c.get(Calendar.YEAR); // current year
 int mMonth = c.get(Calendar.MONTH); // current month
 int mDay = c.get(Calendar.DAY_OF_MONTH); // current day
 // date picker dialog
 datePickerDialog[0] = new DatePickerDialog(RegistrationActivity.this,
 new DatePickerDialog.OnDateSetListener() 

 @Override
 public void onDateSet(DatePicker view, int year,
 int monthOfYear, int dayOfMonth) 
 // set day of month , month and year value in the edit text
 dateOfBirth.setText(year + "-"+(monthOfYear + 1)
 + "-" + dayOfMonth);

 
 , mYear, mMonth, mDay);
 datePickerDialog[0].show();