안드로이드 커스텀 달력 만들기 - 달력 데이터 생성

달력 데이터를 생성하는 것은 ArrayList 또는 Hashmap 을 이용한다.

먼저 달력 데이터 Class 를 구현한다.

package com.link2me.android.item; public class Calendar_Item {     private  String year; // 년     private  String month; // 월     private  String day; // 일     private  int weekday; // 요일     private  String color; // 색상     private String event;     private String key; // 월일 값을 key 로 사용     public Calendar_Item() {     }     public Calendar_Item(String year, String month, String day, int weekday, String color) {         this.year = year;         this.month = month;         this.day = day;         this.weekday = weekday;         this.color = color;     }     public String getYear() {         return year;     }     public void setYear(String year) {         this.year = year;     }     public String getMonth() {         return month;     }     public void setMonth(String month) {         this.month = month;     }     public String getDay() {         return day;     }     public void setDay(String day) {         this.day = day;     }     public int getWeekday() {         return weekday;     }     public void setWeekday(int weekday) {         this.weekday = weekday;     }     public String getColor() {         return color;     }     public void setColor(String color) {         this.color = color;     }     public String getEvent() {         return event;     }     public void setEvent(String event) {         this.event = event;     }     public String getKey() {         return key;     }     public void setKey(String key) {         this.key = key;     } }

먼저 작성했던 MainActivity 에서 makeCalendarList(int CurrentMonth, int yy) 메소드를 추가하면서 필요한 코드를 작성한다.

여기서는 공휴일 데이터를 추가하는 루틴을 생략했다.

공휴일 데이터 추가 샘플은 https://link2me.tistory.com/1699 게시글과 다음 게시글인 CalendarHelper 를 같이 참조하며 CalendarHelper 에 필요한 사항을 추가하고 수정해서 구현하도록 개발자의 몫으로 남겼다.

class package com.link2me.android.calendar; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.text.format.DateFormat; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.EditText; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import com.link2me.android.adpater.GridCellAdapter; import com.link2me.android.item.Calendar_Item; import com.link2me.android.item.Holidays_Item; import com.link2me.android.util.CalendarHelper; import java.text.ParseException; import java.util.ArrayList; import java.util.Calendar; import java.util.HashMap; import java.util.Locale; public class MainActivity extends AppCompatActivity implements View.OnClickListener {     private static final String TAG = MainActivity.class.getSimpleName();     private Context mContext;     private TextView currentMonth;     private ImageView prevYear;     private ImageView prevMonth;     private ImageView nextMonth;     private ImageView nextYear;     private ImageView selectDate;     private GridView calendarView;     private GridCellAdapter adapter;     private Calendar cal;     private int month, year;     private static final String dateTemplate = "yyyy MMMM";     private ArrayList<Calendar_Item> calList = new ArrayList<>();     private static final int DAY_OFFSET = 1;     private final String[] weekdays = new String[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };     private int lastDays;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         mContext = MainActivity.this;         cal = Calendar.getInstance(Locale.getDefault());         month = cal.get(Calendar.MONTH) + 1;         year = cal.get(Calendar.YEAR);         prevYear = (ImageView) this.findViewById(R.id.prevYear);         prevYear.setOnClickListener(this);         prevMonth = (ImageView) this.findViewById(R.id.prevMonth);         prevMonth.setOnClickListener(this);         currentMonth = (TextView) this.findViewById(R.id.currentMonth);         currentMonth.setText(year +"년 " + month + "월");         currentMonth.setOnClickListener(this);         nextMonth = (ImageView) this.findViewById(R.id.nextMonth);         nextMonth.setOnClickListener(this);         nextYear = (ImageView) this.findViewById(R.id.nextYear);         nextYear.setOnClickListener(this);         selectDate = (ImageView) this.findViewById(R.id.selectDate);         selectDate.setOnClickListener(this);         calendarView = (GridView) this.findViewById(R.id.calendar);         makeCalendarList(month, year);         // Initialised         adapter = new GridCellAdapter(mContext, calList);         adapter.notifyDataSetChanged();         calendarView.setAdapter(adapter);     }     private void setGridCellAdapterToDate(int month, int year) {         makeCalendarList(month, year);         adapter = new GridCellAdapter(mContext, calList);         adapter.notifyDataSetChanged();         calendarView.setAdapter(adapter);         // 상단 화면 날짜 출력         currentMonth.setText(year +"년 " + month + "월");     }     private void makeCalendarList(int CurrentMonth, int yy) {         int trailingSpaces = 0;         int daysInPrevMonth = 0;         int prevMonth = 0;         int prevYear = 0;         int nextMonth = 0;         int nextYear = 0;         calList.clear();         Calendar cal = Calendar.getInstance();         int thisYear = cal.get(Calendar.YEAR);         int thisMonth = cal.get(Calendar.MONTH); // 현재 월         int thisDay = cal.get(Calendar.DAY_OF_MONTH); // 오늘 날짜         cal.set(yy,CurrentMonth-1,1); // 0 ~ 11월로 인식하므로 - 1, 입력된 년월         Log.e(TAG, "Calendar SET := " + cal.getTime().toString());         lastDays = cal.getActualMaximum(Calendar.DAY_OF_MONTH);         if (CurrentMonth == 12) {             prevMonth = CurrentMonth - 1;             nextMonth = 1;             prevYear = yy;             nextYear = yy + 1;             daysInPrevMonth = CalendarHelper.getLastDay(prevMonth,prevYear);         } else if (CurrentMonth == 1) {             prevMonth = 12;             prevYear = yy - 1;             nextYear = yy;             nextMonth = CurrentMonth + 1;             daysInPrevMonth = CalendarHelper.getLastDay(prevMonth,prevYear);         } else {             prevMonth = CurrentMonth - 1;             nextMonth = CurrentMonth + 1;             nextYear = yy;             prevYear = yy;             daysInPrevMonth = CalendarHelper.getLastDay(prevMonth,prevYear);         }         int currentWeekDay = cal.get(Calendar.DAY_OF_WEEK) - 1;         trailingSpaces = currentWeekDay;         // 이전월 데이터 채우기 위한 리스트 추가         for (int i = 0; i < trailingSpaces; i++) {             String key = String.format("%02d",prevMonth)+String.format("%02d",(daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i);             addCalendarItem(String.valueOf(prevYear),String.valueOf(prevMonth),String.valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i),                     0,"GRAY","",key);         }         // 현재월 데이터 리스트 추가         for (int i = 1; i <= lastDays; i++) {             String date = String.valueOf(yy)+String.format("%02d",CurrentMonth)+String.format("%02d",i);             String key = String.format("%02d",CurrentMonth)+String.format("%02d",i);             try {                 int weekday = CalendarHelper.WeekendValue(date);                 if(weekday == 1) // 일요일                     addCalendarItem(String.valueOf(yy),String.valueOf(CurrentMonth),String.valueOf(i),weekday,"RED","",key);                 else if(weekday == 7) // 토요일                     addCalendarItem(String.valueOf(yy),String.valueOf(CurrentMonth),String.valueOf(i),weekday,"BLUE","",key);                 else                     addCalendarItem(String.valueOf(yy),String.valueOf(CurrentMonth),String.valueOf(i),weekday,"BLACK","",key);                 if(CurrentMonth-1 == thisMonth){ // 현재월이면                     if(i == thisDay){                         Log.e(TAG, "key := " + key);                         int index = getIndexOfCalList(key);                         Calendar_Item item = calendarItem(String.valueOf(yy),String.valueOf(CurrentMonth),String.valueOf(i),weekday,"CYAN","",key);                         calList.set(index,item);                     }                 }             } catch (ParseException e) {                 e.printStackTrace();             }         }         // 다음달 데이터 채우기 리스트 추가         for (int i = 0; i < calList.size() % 7; i++) {             String key = String.format("%02d",nextMonth)+String.format("%02d",i+1);             addCalendarItem(String.valueOf(nextYear),String.valueOf(nextMonth),String.valueOf(i+1),0,"GRAY",                     "",key);         }     }     private Calendar_Item calendarItem(String year, String month, String day, int weekday, String color, String name, String key){         Calendar_Item item = new Calendar_Item();         item.setYear(year);         item.setMonth(month);         item.setDay(day);         item.setWeekday(weekday);         item.setColor(color);         item.setEvent(name);         item.setKey(key);         return item;     }     private void addCalendarItem(String year, String month, String day, int weekday, String color,String name, String key){         Calendar_Item item = calendarItem(year,month,day,weekday,color,name,key);         calList.add(item);     }     private int getIndexOfCalList(String search_key) {         for (int temp = 0; temp < calList.size(); temp++) {             String key = calList.get(temp).getKey();             if (key != null && key.equals(search_key)) {                 return temp;             }         }         return -1;     }     private String getWeekDayAsString(int i) {         return weekdays[i];     } }

참고 도움될 자료 : https://www.toptal.com/android/android-customization-how-to-build-a-ui-component-that-does-what-you-want

다음은 CalendarHelper Class 를 만들어서 음력/양력 변환, 공휴일 처리, 한달의 마지막 날짜 구하기 등 메소드를 구현한다.