Android Vertically Scrollable Calendar Prototype

This is the Android sample project making the Vertically scrollable calendar for study. You can see sample video.

Check logic point 1

I create the base date to sync page position with particular date. And I also create the base position in middle of thousands pages.

/** Default year to calculate the page position */
final static int BASE_YEAR = 2015;
/** Default month to calculate the page position */
final static int BASE_MONTH = Calendar.JANUARY;
/** Calendar instance based on default year and month */
final Calendar BASE_CAL;
/** Page numbers to reuse */
final static int PAGES = 5;
/** Loops, I think 1000 may be infinite scroll. */
final static int LOOPS = 1000;
/** position basis */
final static int BASE_POSITION = PAGES * LOOPS / 2;
...
Calendar base = Calendar.getInstance();
base.set(BASE_YEAR, BASE_MONTH, 1);
BASE_CAL = base;
...

Check logic point 2

Then, we can get the particular date by page position.

public YearMonth getYearMonth(int position) {
  Calendar cal = (Calendar)BASE_CAL.clone();
  cal.add(Calendar.MONTH, position - BASE_POSITION);
  return new YearMonth(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH));
}

Check logic point 3

We can get the particular page position by given date.

/**
* Get the page position by given date
* @param year 4 digits number of year
* @param month month number
* @return page position
*/
public int getPosition(int year, int month) {
  Calendar cal = Calendar.getInstance();
  cal.set(year, month, 1);
  return BASE_POSITION + howFarFromBase(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH));
}

/**
* How many months exist from the base month to the given values?
* @param year the year to compare with the base year
* @param month the month to compare with the base month
* @return counts of month
*/
private int howFarFromBase(int year, int month) {
  int disY = (year - BASE_YEAR) * 12;
  int disM = month - BASE_MONTH;
  return disY + disM;
}

In this project, I use VerticalViewPager-1 for just vertical view pager. And I refer to 'SimpleInfiniteCarousel' to make a simple infinite carousel with ViewPager on Android.

Sorry

I am not good at english. please let me know the misspelled comments in my code.^^;

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