Android——日历

内容：
1：一个activity_main.xml文件用于创建日历（CalendarView控件）
2: MainActivity文件获取子控件的命名已经显示日历的一些细节
3：Lunar类用于转成农历
activity_main.xml效果如图所示：

代码如下所示：

<?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类代码如下：
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;
//阴历月份表示形式
final static String[] LunarMonthStyle = {“一”, “二”, “三”, “四”, “五”, “六”, “七”, “八”, “九”, “十”, “十一”, “十二”};
@SuppressLint(“SimpleDateFormat”)
static SimpleDateFormat chineseDateFormat = new SimpleDateFormat(“yyyy年MM月dd日”);
final static long[] lunarInfo = new long[]
{
0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,
0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
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);
}

}
/*********************************************************************************/
最终效果图如下：