calendarView.setOnDateChangeListener android studio

Question

everytime user select date the TextView only showing current date

public void initOverall(){
    TextView dateTest = (TextView)findViewById(R.id.cnvrt);
    CalendarView calendarView = (CalendarView)findViewById(R.id.calendarView);
    calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
        @Override
        public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            String selectedDates = sdf.format(new Date(calendarView.getDate()));
            dateTest.setText(selectedDates);

        }
    });
}

Have you tried to set the date from within the callback to the `CallendarView`? — parohy, Sep 04 '18 at 07:32
According to [Docs](https://developer.android.com/reference/android/widget/CalendarView) you can set the date by calling `setDate` and passing the date to the view. You need to declare your `callendrView` => `final CallendarView callendarView` and inside the callback set `callendarView.setDate(calendarView.getDate())`. This may look absurd and even may cause OOM exeption because it may loop, but worth a try. — parohy, Sep 04 '18 at 07:45
still same tho, even the background selected date stick to current date — Cing Cong, Sep 04 '18 at 08:19
im really confused, my program work perfectly on old kitkat samsung tab, but wont work on newer OS — Cing Cong, Sep 04 '18 at 08:21
As an aside consider throwing away the long outmoded and notoriously troublesome `SimpleDateFormat` and friends, and adding [ThreeTenABP](https://github.com/JakeWharton/ThreeTenABP) to your Android project in order to use `java.time`, the modern Java date and time API. It is so much nicer to work with. — Ole V.V., Sep 04 '18 at 09:45

score 3 · Accepted Answer · answered Sep 04 '18 at 09:13

3

Because you just selected a date but not got it as onSelectedDayChange stage.

And the date you chosen was saved in parameters of onSelectedDayChange.

You can try the following code :

public void initOverall(){
        final TextView dateTest = (TextView)findViewById(R.id.cnvrt);
        final CalendarView calendarView = (CalendarView)findViewById(R.id.calendarView);
        calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
            @Override
            public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                String selectedDates = sdf.format(new Date(year-1900,month,dayOfMonth));
                dateTest.setText(selectedDates);
            }
        });
    }

answered Sep 04 '18 at 09:13

Seamas

46
4

wow thanks its works,kind sir dare you explain to me what the function of "year-1900"? – Cing Cong Sep 04 '18 at 09:18
Press your ctrl and click Date, you will see some information in source code of Android Studio. I guess CalendarView doesn't need to show the date before 1900. – Seamas Sep 04 '18 at 09:28
Thanks for wanting to contribute. Apart from using the old-fashioned classes `Date` and `SimpleDateFormat` you are also using the deprecated three-arg `Date` constructor. Never do that. It was deprecated because it works unreliably across time zones. – Ole V.V. Sep 04 '18 at 09:47

score 0 · Answer 2 · answered Sep 04 '18 at 10:02

java.time

public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
    LocalDate date = LocalDate.of(year, Month.values()[month], dayOfMonth);
    String selectedDates = date.toString();
    dateTest.setText(selectedDates);
}

As has been said in comments, you need to pick up the date that the user has chosen from the arguments passed to onSelectedDayChange. Unfortunately the month passed is 0-based, a number in the interval from 0 for January through 11 for December. Month.values()[month] is my trick for obtaining the correct Month object. If you prefer, you may instead just add 1:

    LocalDate date = LocalDate.of(year, month + 1, dayOfMonth);

I am further exploiting the fact that LocalDate.toString produces the format you want, so we need no explicit formatter. The format is ISO 8601.

Question: Can I use java.time on Android?

Yes, java.time works nicely on older and newer Android devices. It just requires at least Java 6.

In Java 8 and later and on newer Android devices (from API level 26, I’m told) the modern API comes built-in.
In Java 6 and 7 get the ThreeTen Backport, the backport of the new classes (ThreeTen for JSR 310; see the links at the bottom).
On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

Oracle tutorial: Date Time explaining how to use java.time.
Java Specification Request (JSR) 310, where java.time was first described.
ThreeTen Backport project, the backport of java.time to Java 6 and 7 (ThreeTen for JSR-310).
ThreeTenABP, Android edition of ThreeTen Backport
Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.
Wikipedia article: ISO 8601

score -1 · Answer 3 · answered Sep 04 '18 at 08:20

CalendarView v = new CalendarView( this );
 v.setOnDateChangeListener( new CalendarView.OnDateChangeListener() {
    public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
       this.calendar = new GregorianCalendar( year, month, dayOfMonth );
    }//met
 });

calendarView.setOnDateChangeListener android studio

3 Answers3

java.time

Question: Can I use java.time on Android?

Links