如何从android中的纬度值中找到度数?

时间:2010-11-18 12:57:19

标签: java android location

我将纬度和经度值作为双精度值(37.33168900,-122.03073100)。

我想将它转换为度数值(37 19'54,48 11'52)。

任何想法? Thanx提前。

7 个答案:

答案 0 :(得分:12)

这将为您提供弧度,分钟和秒的字符串:

String strLongitude = location.convert(location.getLongitude(), location.FORMAT_SECONDS);
String strLatitude = location.convert(location.getLatitude(), location.FORMAT_SECONDS);

答案 1 :(得分:8)

使用此

public static String getFormattedLocationInDegree(double latitude, double longitude) {
    try {
        int latSeconds = (int) Math.round(latitude * 3600);
        int latDegrees = latSeconds / 3600;
        latSeconds = Math.abs(latSeconds % 3600);
        int latMinutes = latSeconds / 60;
        latSeconds %= 60;

        int longSeconds = (int) Math.round(longitude * 3600);
        int longDegrees = longSeconds / 3600;
        longSeconds = Math.abs(longSeconds % 3600);
        int longMinutes = longSeconds / 60;
        longSeconds %= 60;
        String latDegree = latDegrees >= 0 ? "N" : "S";
        String lonDegrees = longDegrees >= 0 ? "E" : "W";

        return  Math.abs(latDegrees) + "°" + latMinutes + "'" + latSeconds
                + "\"" + latDegree +" "+ Math.abs(longDegrees) + "°" + longMinutes
                + "'" + longSeconds + "\"" + lonDegrees;
    } catch (Exception e) {
        return ""+ String.format("%8.5f", latitude) + "  "
                + String.format("%8.5f", longitude) ;
    }
}

答案 2 :(得分:7)

应该是一些数学:

(int)37.33168                => 37
37.33168 % 1 = 0.33168       
0.33168 * 60 = 19,905        => 19
19.905 % 1 = 0.905
0.905 * 60                   => 54

与-122相同(如果为负值则添加360)

修改 可能有一些API,我不知道。

答案 3 :(得分:2)

另请参阅Location类文档,尤其是convert()方法,因为它应该按照您的意愿执行。

答案 4 :(得分:1)

Abi的答案在我的位置非常有效,但在其他一些地方产生错误,例如西半球的“E”而不是“W”。 IMO应该是:

String lonDegrees = longDegrees >= 0 ? "E" : "W";

而不是:

String lonDegrees = latDegrees >= 0 ? "E" : "W";

答案 5 :(得分:1)

另一种可以实现此目的的方法是使用以下功能

private String convertCoordinate(double coordinate, boolean isLatitude){
    String[] pString = isLatitude ? new String[]{"N", "S"} :  new String[]{"E", "W"};
    int degree = (int) coordinate;
    int minute = (int) (Math.abs(coordinate) * 60) % 60;
    int second = (int) (Math.abs(coordinate) * 3600) % 60;

    int index = degree < 0 ? 1 : 0;
    degree = Math.abs(degree);

    return degree + pString[index] + " " + minute + "' " + second + "\"";
}

答案 6 :(得分:0)

基于SO答案,我制作了一个代码将DEG转换为DMS格式

  例如:40°42'51“N 74°00'21”W

     

示例调用:getLocationAsDMS(location,8)    8是此格式的正确数字

public String getLocationAsDMS (Location location, int decimalPlace){
    String strLatitude = Location.convert(location.getLatitude(), Location.FORMAT_SECONDS);
    strLatitude = replaceDelimiters(strLatitude, decimalPlace);
    char latCardinal = location.getLongitude() >= 0 ? 'N' : 'S';
    strLatitude = strLatitude + " " + latCardinal;

    String strLongitude = Location.convert(location.getLongitude(), Location.FORMAT_SECONDS);
    strLongitude = replaceDelimiters(strLongitude, decimalPlace);
    char lonCardinal = location.getLongitude() >= 0 ? 'E' : 'W';
    strLongitude = strLongitude + " " + lonCardinal;

    return strLatitude + " " + strLongitude;
}

@NonNull
private String replaceDelimiters(String str, int decimalPlace) {
    str = str.replaceFirst(":", "°");
    str = str.replaceFirst(":", "'");
    int pointIndex = str.indexOf(".");
    int endIndex = pointIndex + 1 + decimalPlace;
    if(endIndex < str.length()) {
        str = str.substring(0, endIndex);
    }
    str = str + "\"";
    return str;
}