Android Open Source - HijriCalendar-master Calendar Helper

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License

The source code is released under:

MIT License

Java Source Code

package com.sahaab.hijri.caldroid;
/*from w  w w . j  a  v a  2 s . co  m*/
import hirondelle.date4j.DateTime;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

/**
 * Convenient helper to work with date, JODA DateTime and String
 * 
 * @author thomasdao
 * 
 */
public class CalendarHelper {

  public static SimpleDateFormat yyyyMMddFormat = new SimpleDateFormat(
      "yyyy-MM-dd", Locale.ENGLISH);

  public static SimpleDateFormat MMMFormat = new SimpleDateFormat(
      "MMM", Locale.getDefault());

  /**
   * Retrieve all the dates for a given calendar month Include previous month,
   * current month and next month.
   * 
   * @param month
   * @param year
   * @param startDayOfWeek
   *            : calendar can start from customized date instead of Sunday
   * @return
   */
  public static ArrayList<DateTime> getFullWeeks(int month, int year,
      int startDayOfWeek, boolean sixWeeksInCalendar) {
    ArrayList<DateTime> datetimeList = new ArrayList<DateTime>();

    DateTime firstDateOfMonth = new DateTime(year, month, 1, 0, 0, 0, 0);
    DateTime lastDateOfMonth = firstDateOfMonth.plusDays(firstDateOfMonth
        .getNumDaysInMonth() - 1);

    // Add dates of first week from previous month
    int weekdayOfFirstDate = firstDateOfMonth.getWeekDay();

    // If weekdayOfFirstDate smaller than startDayOfWeek
    // For e.g: weekdayFirstDate is Monday, startDayOfWeek is Tuesday
    // increase the weekday of FirstDate because it's in the future
    if (weekdayOfFirstDate < startDayOfWeek) {
      weekdayOfFirstDate += 7;
    }

    while (weekdayOfFirstDate > 0) {
      DateTime dateTime = firstDateOfMonth.minusDays(weekdayOfFirstDate
          - startDayOfWeek);
      if (!dateTime.lt(firstDateOfMonth)) {
        break;
      }

      datetimeList.add(dateTime);
      weekdayOfFirstDate--;
    }

    // Add dates of current month
    for (int i = 0; i < lastDateOfMonth.getDay(); i++) {
      datetimeList.add(firstDateOfMonth.plusDays(i));
    }

    // Add dates of last week from next month
    int endDayOfWeek = startDayOfWeek - 1;

    if (endDayOfWeek == 0) {
      endDayOfWeek = 7;
    }

    if (lastDateOfMonth.getWeekDay() != endDayOfWeek) {
      int i = 1;
      while (true) {
        DateTime nextDay = lastDateOfMonth.plusDays(i);
        datetimeList.add(nextDay);
        i++;
        if (nextDay.getWeekDay() == endDayOfWeek) {
          break;
        }
      }
    }

    // Add more weeks to fill remaining rows
    if (sixWeeksInCalendar) {
      int size = datetimeList.size();
      int row = size / 7;
      int numOfDays = (6 - row) * 7;
      DateTime lastDateTime = datetimeList.get(size - 1);
      for (int i = 1; i <= numOfDays; i++) {
        DateTime nextDateTime = lastDateTime.plusDays(i);
        datetimeList.add(nextDateTime);
      }
    }

    return datetimeList;
  }

  /**
   * Get the DateTime from Date, with hour and min is 0
   * 
   * @param date
   * @return
   */
  public static DateTime convertDateToDateTime(Date date) {
    // Get year, javaMonth, date
    Calendar calendar = Calendar.getInstance();
    calendar.clear();
    calendar.setTime(date);

    int year = calendar.get(Calendar.YEAR);
    int javaMonth = calendar.get(Calendar.MONTH);
    int day = calendar.get(Calendar.DATE);

    // javaMonth start at 0. Need to plus 1 to get datetimeMonth
    return new DateTime(year, javaMonth + 1, day, 0, 0, 0, 0);
  }

  public static Date convertDateTimeToDate(DateTime dateTime) {
    int year = dateTime.getYear();
    int datetimeMonth = dateTime.getMonth();
    int day = dateTime.getDay();

    Calendar calendar = Calendar.getInstance();
    calendar.clear();

    // datetimeMonth start at 1. Need to minus 1 to get javaMonth
    calendar.set(year, datetimeMonth - 1, day);

    return calendar.getTime();
  }

  /**
   * Get the Date from String with custom format. Default format is yyyy-MM-dd
   * 
   * @param dateString
   * @param dateFormat
   * @return
   * @throws ParseException
   */
  public static Date getDateFromString(String dateString, String dateFormat)
      throws ParseException {
    SimpleDateFormat formatter;
    if (dateFormat == null) {
      formatter = yyyyMMddFormat;
    } else {
      formatter = new SimpleDateFormat(dateFormat, Locale.ENGLISH);
    }

    return formatter.parse(dateString);
  }

  /**
   * Get the DateTime from String with custom format. Default format is
   * yyyy-MM-dd
   * 
   * @param dateString
   * @param dateFormat
   * @return
   */
  public static DateTime getDateTimeFromString(String dateString,
      String dateFormat) {
    Date date;
    try {
      date = getDateFromString(dateString, dateFormat);
      return convertDateToDateTime(date);
    } catch (ParseException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return null;
  }

  public static ArrayList<String> convertToStringList(
      ArrayList<DateTime> dateTimes) {
    ArrayList<String> list = new ArrayList<String>();
    for (DateTime dateTime : dateTimes) {
      list.add(dateTime.format("YYYY-MM-DD"));
    }
    return list;
  }

}

Java Source Code List

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