android - 公历到回历(伊斯兰)日期

Question

Android 中是否有任何方法或库可以将公历日期转换为回历(伊斯兰)日期？我找到了一些 Java 库，例如 Joda Time，但我需要一些适用于 Android 的库。

Answer 1

我找到了这个但是我还没有测试

public class DateHijri {

    static double gmod(double n, double m) {
        return ((n % m) + m) % m;
    }

    static double[] kuwaiticalendar(boolean adjust) {
        Calendar today = Calendar.getInstance();
        int adj = 0;
        if (adjust) {
            adj = 0;
        } else {
            adj = 1;
        }

        if (adjust) {
            int adjustmili = 1000 * 60 * 60 * 24 * adj;
            long todaymili = today.getTimeInMillis() + adjustmili;
            today.setTimeInMillis(todaymili);
        }
        double day = today.get(Calendar.DAY_OF_MONTH);
        double month = today.get(Calendar.MONTH);
        double year = today.get(Calendar.YEAR);

        double m = month + 1;
        double y = year;
        if (m < 3) {
            y -= 1;
            m += 12;
        }

        double a = Math.floor(y / 100.);
        double b = 2 - a + Math.floor(a / 4.);

        if (y < 1583)
            b = 0;
        if (y == 1582) {
            if (m > 10)
                b = -10;
            if (m == 10) {
                b = 0;
                if (day > 4)
                    b = -10;
            }
        }

        double jd = Math.floor(365.25 * (y + 4716))
                + Math.floor(30.6001 * (m + 1)) + day + b - 1524;

        b = 0;
        if (jd > 2299160) {
            a = Math.floor((jd - 1867216.25) / 36524.25);
            b = 1 + a - Math.floor(a / 4.);
        }
        double bb = jd + b + 1524;
        double cc = Math.floor((bb - 122.1) / 365.25);
        double dd = Math.floor(365.25 * cc);
        double ee = Math.floor((bb - dd) / 30.6001);
        day = (bb - dd) - Math.floor(30.6001 * ee);
        month = ee - 1;
        if (ee > 13) {
            cc += 1;
            month = ee - 13;
        }
        year = cc - 4716;

        double wd = gmod(jd + 1, 7) + 1;

        double iyear = 10631. / 30.;
        double epochastro = 1948084;
        double epochcivil = 1948085;

        double shift1 = 8.01 / 60.;

        double z = jd - epochastro;
        double cyc = Math.floor(z / 10631.);
        z = z - 10631 * cyc;
        double j = Math.floor((z - shift1) / iyear);
        double iy = 30 * cyc + j;
        z = z - Math.floor(j * iyear + shift1);
        double im = Math.floor((z + 28.5001) / 29.5);
        if (im == 13)
            im = 12;
        double id = z - Math.floor(29.5001 * im - 29);

        double[] myRes = new double[8];

        myRes[0] = day; // calculated day (CE)
        myRes[1] = month - 1; // calculated month (CE)
        myRes[2] = year; // calculated year (CE)
        myRes[3] = jd - 1; // julian day number
        myRes[4] = wd - 1; // weekday number
        myRes[5] = id; // islamic date
        myRes[6] = im - 1; // islamic month
        myRes[7] = iy; // islamic year

        return myRes;
    }

    static String writeIslamicDate() {
        String[] wdNames = { "Ahad", "Ithnin", "Thulatha", "Arbaa", "Khams",
                "Jumuah", "Sabt" };
        String[] iMonthNames = { "Muharram", "Safar", "Rabi'ul Awwal",
                "Rabi'ul Akhir", "Jumadal Ula", "Jumadal Akhira", "Rajab",
                "Sha'ban", "Ramadan", "Shawwal", "Dhul Qa'ada", "Dhul Hijja" };
        // This Value is used to give the correct day +- 1 day
        boolean dayTest = true;
        double[] iDate = kuwaiticalendar(dayTest);
        String outputIslamicDate = wdNames[(int) iDate[4]] + ", " + iDate[5]
                + " " + iMonthNames[(int) iDate[6]] + " " + iDate[7] + " AH";

        return outputIslamicDate;
    }
}