Hi all,
I'm trying to create a new widget for my instance of ODK Collect which
will take a previously entered date (from an earlier date field),
perform a calculation and display the adjusted date to the user. The
user has no need to edit this date - they just need to view for now
(though I may in the future want to add the options for them to edit
it).
I used the calculate attribute on the bind node, like this:
to push the date into the widget and it displays the new calculated
date as I intended.
However when I save the form (and either view with ODK Collect, or
submit to Aggregate server), it's not sending the new (calculated)
value for /data/edd, but instead it's sending the original value from
the calculate attribute (/data/lmp).
In my widget I have the modified set/getAnswer() methods:
private void setAnswer() {
if (mPrompt.getAnswerValue() != null)
lmp = new DateTime(((Date) ((DateData)
mPrompt.getAnswerValue()).getValue()).getTime());{
edd = lmp.plusDays(280);
// some code here which displays the date on the
screen
} else {
Toast.makeText(getContext(), "Invalid input date",
Toast.LENGTH_SHORT).show();
}
}
public IAnswerData getAnswer() {
try {
return new DateData(edd.toDate());
} catch (Exception e) {
Toast.makeText(getContext(), "Invalid date",
Toast.LENGTH_SHORT).show();
}
return null;
}
The "edd" property has the recalculated date set ok (I can confirm by
displaying on screen).
So I'm a little confused what's going on. Is it:
a) Intended behaviour of the calculate attribute - I noticed that if I
set the field up as a regular date picker, it sets the default date
display date to be what I intend, but if I change this my changed date
isn't saved/submitted - so seems to me that the calculate attribute
overrides what the user enters?
b) a bug
c) (most likely!) I should be doing something different? I couldn't
find another way to pass in the date from a previous form field other
than using the calculate attribute - but maybe I missed something? Or
my handling of the get/setAnswer methods is wrong?
Any help much appreciated 
I can send on more complete code if that
would help?
Cheers,
Alex