Android-Calendar

Contents:
1: An activity_main.xml file is used to create the calendar (CalendarView control)
2: The MainActivity file obtains the naming of the sub-controls. Some details of the calendar have been displayed.
3: The Lunar class is used to convert to the lunar calendar
activity_main.xml. The effect is shown in the figure:

The code is as follows:

<?xml version="1.0" encoding="utf-8"?>

/*********************************************************************************/
MainActivity代码如下：
public class MainActivity extends AppCompatActivity {
TextView ShowChooseData,ShowLunar;
CalendarView calendarView;
private Calendar calendar;
ImageView Left,Right;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    calendar = Calendar.getInstance();
    Left = (ImageView) findViewById(R.id.left);
    Right = (ImageView) findViewById(R.id.right);
    ShowChooseData = (TextView) findViewById(R.id.ShowChooseData);
    ShowLunar = (TextView) findViewById(R.id.ShowLunar);
    calendarView = (CalendarView) findViewById(R.id.calendarView);
    calendarView.setOnDateChangeListener(new OnDateChangeListener() {
        @Override
        public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {

            ShowChooseData.setText(year +" -"+ month+1 +"- "+ dayOfMonth);
            calendar.set(year,month,dayOfMonth);
            Lunar lunar = new Lunar(calendar);
            ShowLunar.setText("农历:"+lunar.toString());
        }
    });
}

}
/************************************************ *********************************/
Lunar class code is as follows:
package com.example.calendardemo;

import android.annotation.SuppressLint;

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

public class Lunar { private final int year; private final int month; private final int day; private boolean leap; //Lunar month representation final static String[] LunarMonthStyle = {"一", "二", "三", " Four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve"}; @SuppressLint("SimpleDateFormat") static SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy MM month dd day"); final static long[] lunarInfo = new long[] { 0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055b6, 0x0a0d 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x04970052













0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,
0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,
0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,
0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,
0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,
0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,
0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};

//====== 传回农历 y年的总天数
final private static int yearDays(int y) {
    int i, sum = 348;
    for (i = 0x8000; i > 0x8; i >>= 1) {
        if ((lunarInfo[y - 1900] & i) != 0)
            sum += 1;
    }
    return (sum + leapDays(y));
}


//====== 传回农历 y年闰月的天数
final private static int leapDays(int y) {
    if (leapMonth(y) != 0) {
        if ((lunarInfo[y - 1900] & 0x10000) != 0)
            return 30;
        else
            return 29;
    } else
        return 0;
}


//====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
final private static int leapMonth(int y) {
    return (int) (lunarInfo[y - 1900] & 0xf);
}


//====== 传回农历 y年m月的总天数
final private static int monthDays(int y, int m) {
    if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
        return 29;
    else
        return 30;
}


//====== 传回农历 y年的生肖
final public String animalsYear() {
    final String[] Animals = new String[]{"鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪"};
    return Animals[(year - 4) % 12];
}


//====== 传入 月日的offset 传回干支, 0=甲子
final private static String cyclicalm(int num) {
    final String[] TianGan = new String[]{"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"};
    final String[] JiaZi = new String[]{"子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"};
    return (TianGan[num % 10] + JiaZi[num % 12]);
}


//====== 传入 offset 传回干支, 0=甲子
final public String cyclical() {
    int num = year - 1900 + 36;
    return (cyclicalm(num));
}
public String getLunarMonthString() {
    // TODO Auto-generated method stub
    return null;
}


public Lunar(Calendar cal) {
    @SuppressWarnings("unused") int yearCyl, monCyl, dayCyl;
    int leapMonth = 0;
    Date baseDate = null;
    try {
        baseDate = chineseDateFormat.parse("1900年1月31日");
    } catch (ParseException e) {
        e.printStackTrace(); //To change body of catch statement use Options | File Templates.
    }


    //求出和1900年1月31日相差的天数
    assert baseDate != null;
    int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
    dayCyl = offset + 40;
    monCyl = 14;


    //用offset减去每农历年的天数
    // 计算当天是农历第几天
    //i最终结果是农历的年份
    //offset是当年的第几天
    int iYear, daysOfYear = 0;
    for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
        daysOfYear = yearDays(iYear);
        offset -= daysOfYear;
        monCyl += 12;
    }
    if (offset < 0) {
        offset += daysOfYear;
        iYear--;
        monCyl -= 12;
    }
    //农历年份
    year = iYear;

    yearCyl = iYear - 1864;
    leapMonth = leapMonth(iYear); //闰哪个月,1-12
    leap = false;


    //用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
    int iMonth, daysOfMonth = 0;
    for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
        //闰月
        if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
            --iMonth;
            leap = true;
            daysOfMonth = leapDays(year);
        } else
            daysOfMonth = monthDays(year, iMonth);


        offset -= daysOfMonth;
        //解除闰月
        if (leap && iMonth == (leapMonth + 1)) leap = false;
        if (!leap) monCyl++;
    }
    //offset为0时，并且刚才计算的月份是闰月，要校正
    if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
        if (leap) {
            leap = false;
        } else {
            leap = true;
            --iMonth;
            --monCyl;
        }
    }
    //offset小于0时，也要校正
    if (offset < 0) {
        offset += daysOfMonth;
        --iMonth;
        --monCyl;
    }
    month = iMonth;
    day = offset + 1;
}


public static String getChinaDayString(int day) {
    String[] chineseTen = {"初", "十", "廿", "三"};
    int n = day % 10 == 0 ? 9 : day % 10 - 1;
    if (day > 30)
        return "";
    if (day == 10)
        return "初十";
    else
        return chineseTen[day / 10] + LunarMonthStyle[n];
}


public String toString() {
    return (leap ? "闰" : "") + LunarMonthStyle[month - 1] + "月" + getChinaDayString(day);
}

}
/************************************************ *********************************/ The
final rendering is as follows: