如何获取SD卡中图像的经度和纬度到我的应用程序? [英] How to get the latitude and longitude of an image in sdcard to my application?

问题描述

从我的应用程序中，我可以打开图库.有什么方法可以将图库中选定图像的纬度和经度传送到我的应用程序?

From my application I can open gallery. Is there any way to get latitude and longitude of any selected image in gallery to my application?

推荐答案

您应该使用 ExifInterface 类，用于从图片中读取各种EXIF元数据:

You Should Go with ExifInterface class to read various EXIF metadata from Images:

示例:

ExifInterface exif = new ExifInterface(filepath);
exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE);
exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE_REF);
exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE);
exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF);

已

现在，您将获得"Lat-long"(以下格式)格式.

Now Here you will get lat-long as Below format.

纬度= 30/1,12/1,34/1， long = 81/1,22/1,41/1

lat = 30/1,12/1,34/1, long=81/1,22/1,41/1

要将其转换为实值此博客帮助了我.

To Convert this into Real Values this Blog Helped Me.

我们需要进行从度，分，秒形式到GeoPoint形式的转换.

we need to do conversion from degree, minute, second form to GeoPoint form.

通过下面的方式，您可以做到.

By Below Way you can Do it.

 String LATITUDE = exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE);
 String LATITUDE_REF = exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE_REF);
 String LONGITUDE = exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE);
 String LONGITUDE_REF = exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF);

 // your Final lat Long Values
 Float Latitude, Longitude;

 if((LATITUDE !=null)
   && (LATITUDE_REF !=null)
   && (LONGITUDE != null)
   && (LONGITUDE_REF !=null))
 {

  if(LATITUDE_REF.equals("N")){
   Latitude = convertToDegree(LATITUDE);
  }
  else{
   Latitude = 0 - convertToDegree(LATITUDE);
  }

  if(LONGITUDE_REF.equals("E")){
   Longitude = convertToDegree(LONGITUDE);
  }
  else{
   Longitude = 0 - convertToDegree(LONGITUDE);
  }

 }

private Float convertToDegree(String stringDMS){
 Float 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 Float(FloatD + (FloatM/60) + (FloatS/3600));

 return result;


};



@Override
public String toString() {
 // TODO Auto-generated method stub
 return (String.valueOf(Latitude)
   + ", "
   + String.valueOf(Longitude));
}

public int getLatitudeE6(){
 return (int)(Latitude*1000000);
}

public int getLongitudeE6(){
 return (int)(Longitude*1000000);
}

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