通过ExifInterface可以将拍照时的一些属性信息写入图片文件里，其中包括经纬度信息。本文介绍一种将经纬度坐标写入JPEG图片文件的方法！

核心代码

/*** 浮点型经纬度值转成度分秒格式* * @param coord* @return*/ public String decimalToDMS(double coord) { String output, degrees, minutes, seconds;// gets the modulus the coordinate divided by one (MOD1).// in other words gets all the numbers after the decimal point.// e.g. mod := -79.982195 % 1 == 0.982195//// next get the integer part of the coord. On other words the whole// number part.// e.g. intPart := -79 double mod = coord % 1; int intPart = (int) coord;// set degrees to the value of intPart// e.g. degrees := "-79" degrees = String.valueOf(intPart);// next times the MOD1 of degrees by 60 so we can find the integer part// for minutes.// get the MOD1 of the new coord to find the numbers after the decimal// point.// e.g. coord := 0.982195 * 60 == 58.9317// mod := 58.9317 % 1 == 0.9317//// next get the value of the integer part of the coord.// e.g. intPart := 58 coord = mod * 60; mod = coord % 1; intPart = (int) coord; if (intPart < 0) { // Convert number to positive if it's negative. intPart *= -1;}// set minutes to the value of intPart.// e.g. minutes = "58" minutes = String.valueOf(intPart);// do the same again for minutes// e.g. coord := 0.9317 * 60 == 55.902// e.g. intPart := 55 coord = mod * 60; intPart = (int) coord; if (intPart < 0) { // Convert number to positive if it's negative. intPart *= -1; }// set seconds to the value of intPart.// e.g. seconds = "55" seconds = String.valueOf(intPart);// I used this format for android but you can change it// to return in whatever format you like// e.g. output = "-79/1,58/1,56/1" output = degrees + "/1," + minutes + "/1," + seconds + "/1";// Standard output of D°M′S″// output = degrees + "°" + minutes + "'" + seconds + "\""; return output; }/*** 将经纬度信息写入JPEG图片文件里* * @param picPath* JPEG图片文件路径* @param dLat* 纬度* @param dLon* 经度*/ public void writeLatLonIntoJpeg(String picPath, double dLat, double dLon) { File file = new File(picPath); if (file.exists()) { try { ExifInterface exif = new ExifInterface(picPath); String tagLat = exif .getAttribute(ExifInterface.TAG_GPS_LATITUDE); String tagLon = exif .getAttribute(ExifInterface.TAG_GPS_LONGITUDE); if (tagLat == null && tagLon == null) // 无经纬度信息{ exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, decimalToDMS(dLat)); exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, dLat > 0 ? "N" : "S"); // 区分南北半球 exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, decimalToDMS(dLon)); exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, dLon > 0 ? "E" : "W"); // 区分东经西经 exif.saveAttributes();} } catch (Exception e) { }} }

测试代码

String strImgPath = getImageCachePath() + File.separator + "1.jpg";ExifInterface eif = new ExifInterface(strImgPath);String lat = eif.getAttribute(ExifInterface.TAG_GPS_LATITUDE);String latRef = eif.getAttribute(ExifInterface.TAG_GPS_LATITUDE_REF);String lon = eif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE);String lonRef = eif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF);System.out.println("Latitude Ref - " + latRef);System.out.println("Latitude - " + lat);System.out.println("Longitude Ref - " + lonRef);System.out.println("Longitude - " + lon);if (lat == null && lon == null) // 没有位置信息才写入{ writeLatLonIntoJpeg(strImgPath, 39.23456, 116.123456);}

第一次运行结果

05-22 17:36:24.566: I/System.out(17966): Latitude Ref - null05-22 17:36:24.566: I/System.out(17966): Latitude - null05-22 17:36:24.566: I/System.out(17966): Longitude Ref - null05-22 17:36:24.566: I/System.out(17966): Longitude - null

原始图片没有位置信息，通过调用writeLatLonIntoJpeg(strImgPath, 39.23456, 116.123456)来模拟写入一个位置。

第二次运行结果

05-22 17:37:11.446: I/System.out(17966): Latitude Ref - N05-22 17:37:11.446: I/System.out(17966): Latitude - 39/1,14/1,4/105-22 17:37:11.446: I/System.out(17966): Longitude Ref - E05-22 17:37:11.446: I/System.out(17966): Longitude - 116/1,7/1,24/1

以上这篇android实现将位置信息写入JPEG图片文件就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。