【Android】今月の日数を確認する

import java.util.Calendar;
import java.util.GregorianCalendar;


public static int getDaysOfMonth(){
    Calendar calendar = Calendar.getInstance();
    int year = calendar.get(Calendar.YEAR);
    int month = calendar.get(Calendar.MONTH);

    Calendar c = new GregorianCalendar(year,month,1);
    int days=c.getActualMaximum(Calendar.DAY_OF_MONTH);

    return days;
}