保存和检索 JPEG 图像内的位置答案

【问题标题】：Save and Retrieve location inside JPEG image保存和检索 JPEG 图像内的位置
【发布时间】：2016-02-26 13:58:20
【问题描述】：

我将分享一个解决方案，其中包括在 JPEG 图像文件中保存和检索位置。纬度和经度是使用 ExifInterface 在图像元数据中保存和检索的更多关于 ExifInterface 的信息可以在这里找到 http://developer.android.com/reference/android/media/ExifInterface.html

【问题讨论】：

标签： android image image-processing location jpeg

【解决方案1】：

public void saveLocation() {
    ExifInterface exif = null;
    try {
        exif = new ExifInterface(imagePath);
        exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, latitude);
        exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, longitude);
        exif.saveAttributes();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void retriveLocation() {
    ExifInterface exif = null;
    try {
        exif = new ExifInterface(imagePath);
        String[] latitudeValue = exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE).split(",");
        String[] longitudeValue = exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE).split(",");
        String[] tmp = new String[2];
        tmp = latitudeValue[0].split("/");
        setLatitude(String.valueOf(Float.valueOf(tmp[0]) / Float.valueOf(tmp[1])));
        tmp = longitudeValue[0].split("/");
        setLongitude(String.valueOf(Float.valueOf(tmp[0]) / Float.valueOf(tmp[1])));

    } catch (IOException e) {
        e.printStackTrace();
    }


}

【讨论】：

【解决方案2】：

使用ExifInterface，您可以从媒体获取以下信息。

变量声明。

String mediaDateTime,attrLATITUDE,attrLATITUDE_REF,attrLONGITUDE,attrLONGITUDE_REF,zip, city,state, country;;
Double Latitude, Longitude;
List<Address> addresses;
Geocoder geocoder;

用户ExifInterface使用以下方式。

ExifInterface exifInterfaceMedia = new ExifInterface(<Your Image Path>);
// This will give you data and time
mediaDateTime = exifInterfaceMedia.getAttribute(ExifInterface.TAG_DATETIME);

attrLATITUDE = exifInterfaceMedia.getAttribute(ExifInterface.TAG_GPS_LATITUDE);
attrLATITUDE_REF = exifInterfaceMedia.getAttribute(ExifInterface.TAG_GPS_LATITUDE_REF);
attrLONGITUDE = exifInterfaceMedia.getAttribute(ExifInterface.TAG_GPS_LONGITUDE);
attrLONGITUDE_REF = exifInterfaceMedia.getAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF);

if ((attrLATITUDE != null) && (attrLATITUDE_REF != null) && (attrLONGITUDE != null) && (attrLONGITUDE_REF != null)) {
  valid = true;

  if (attrLATITUDE_REF.equals("N")) {
    Latitude = convertToDegree(attrLATITUDE);
  } else {
    Latitude = 0 - convertToDegree(attrLATITUDE);
  }
  if (attrLONGITUDE_REF.equals("E")) {
    Longitude = convertToDegree(attrLONGITUDE);
  } else {
    Longitude = 0 - convertToDegree(attrLONGITUDE);
  }

  try {
    addresses = geocoder.getFromLocation(Latitude, Longitude, 1);
  } catch (IOException e) {
    e.printStackTrace();
  }
  if (addresses != null && addresses.size() > 0) {
    zip = addresses.get(0).getPostalCode();
    city = addresses.get(0).getLocality();
    state = addresses.get(0).getAdminArea();
    country = addresses.get(0).getCountryName();
    if (zip != null) {
      title += zip + ",";
    }
    if (city != null) {
      title += city + ",";
    }
    if (state != null) {
      title += state + ",";
    }
    if (country != null) {
      title += country;
    }
  } else {
    title = "Unknown Location";
  }
}

private Double convertToDegree(String stringDMS) {
  Double result = null;
  String[] DMS = stringDMS.split(",", 3);

  String[] stringD = DMS[0].split("/", 2);
  Double D0 = new Double(stringD[0]);
  Double D1 = new Double(stringD[1]);
  Double FloatD = D0 / D1;

  String[] stringM = DMS[1].split("/", 2);
  Double M0 = new Double(stringM[0]);
  Double M1 = new Double(stringM[1]);
  Double FloatM = M0 / M1;

  String[] stringS = DMS[2].split("/", 2);
  Double S0 = new Double(stringS[0]);
  Double S1 = new Double(stringS[1]);
  Double FloatS = S0 / S1;

  result = new Double(FloatD + (FloatM / 60) + (FloatS / 3600));

  return result;
}

【讨论】：