如何将 sdcard 中图像的纬度和经度获取到我的应用程序?

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任何选定图像的纬度和经度获取到我的应用程序?

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

你应该使用 ExifInterface 从图像中读取各种 EXIF 元数据的类:

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

例子:

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

现在在这里您将得到以下格式的经纬度.

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

将其转换为实际值此博客 帮助了我.

To Convert this into Real Values this Blog Helped Me.

我们需要进行度、分、秒形式到GeoPoint形式的转换.

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

通过以下方式，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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