@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    database=new DataBase(this.getContext());
    cal_doj=getActivity().findViewById(R.id.calview_doj);
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
    data_date = sdf.format(new Date(cal_doj.getDate()));
    cal_doj.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
        @Override
        public void onSelectedDayChange(@NonNull CalendarView calendarView, int year, int month, int date) {
            if(month==12)
                month=1;
            else
                month=month+1;
            data_date=date + "/" + month + "/" + year;
            Toast.makeText(getContext(), date + "/" + month + "/" + year , Toast.LENGTH_SHORT).show();
        }

    });
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    calendarView = (CalendarView) findViewById(R.id.CalendarView); // get the reference of CalendarView
    calendarView.setDate(System.currentTimeMillis(), false, true);
    calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
        @Override
        public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
            Intent intent = new Intent(MainActivity.this, OverviewActivity.class);
            // Build string from chosen date to parse into Date object
            // (month+1) because months count from 0 in java but SimpleDateFormat parses it as 1-12
            String chosenDate = dayOfMonth + "/" + (month+1) + "/" + year;
            SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
            try{
                Date date = sdf.parse(chosenDate);
                long millis = date.getTime();
                intent.putExtra("DATE", millis);
            } catch (ParseException e){
                e.printStackTrace();
            }

            startActivity(intent);
        }
    });
    overridePendingTransition(0, 0);
}
 

@Override
public void onSelectedDayChange(CalendarView view, int year, int month,
                                int dayOfMonth) {
    textView.setText(FORMATTER.format(view.getDate()));
}
 

public CalendarView getCalendarView() {
    return calendarView;
}
 

@Override
public CalendarView getCalendarView() {
    return mCalendarView;
}
 

@Override
public void onSelectedDayChange(CalendarView view, int year, int month,
                                int dayOfMonth) {
    textView.setText(FORMATTER.format(view.getDate()));
}
 

public static BaseDSL.ViewClassResult calendarView() {
  return BaseDSL.v(CalendarView.class);
}
 

public static Void calendarView(Anvil.Renderable r) {
  return BaseDSL.v(CalendarView.class, r);
}
 

public static Void onDateChange(CalendarView.OnDateChangeListener arg) {
  return BaseDSL.attr("onDateChange", arg);
}
 

public static BaseDSL.ViewClassResult calendarView() {
  return BaseDSL.v(CalendarView.class);
}
 

public static Void calendarView(Anvil.Renderable r) {
  return BaseDSL.v(CalendarView.class, r);
}
 

public static Void onDateChange(CalendarView.OnDateChangeListener arg) {
  return BaseDSL.attr("onDateChange", arg);
}
 

public void onDateChanged(CalendarView v, int y, int m, int d) {
    dateInMillis = new GregorianCalendar(y, m, d).getTimeInMillis();
}
 

@Override
public void onSelectedDayChange(
    CalendarView view, int year, int month,
    int dayOfMonth) {
  textView.setText(FORMATTER.format(view.getDate()));
}
 

public CalendarViewAssert(CalendarView actual) {
  super(actual, CalendarViewAssert.class);
}
 

/**
 * Gets the {@link CalendarView}.
 * <p>
 * This method returns {@code null} when the
 * {@link android.R.attr#datePickerMode} attribute is set
 * to {@code calendar}.
 *
 * @return The calendar view.
 * @see #getCalendarViewShown()
 */
public CalendarView getCalendarView() {
    return mDelegate.getCalendarView();
}
 

CalendarView getCalendarView();