Android将EXIF GPS纬度和经度写入JPEG失败

Question

我想在jpeg照片中添加经度和纬度等GPS数据.通过标签卡(NFC)捕获照片在logcat中可以显示正确的值,但这些值不能写入jpg照片文件!

下面是我的代码:它用于获取保存的jpg文件并调用下面的方法该方法用于将EXIF GPS参数添加到jpg中经度和纬度等GPS参数已经在另一个活动中使用.

我在Firefox中使用EXIF Viewer来查看结果.

IO异常的位置是否重要？

以下是可能导致失败的重要日志cat日志:07-26 11:48:30.386:D/NativeNfcTag(195):标记丢失,重新启动轮询循环

 public static void writeFile (File photo, double latitude, double longitude) throws IOException{


    ExifInterface exif = null;

    try{
        Log.v("latiDouble", ""+latitude);
        Log.v("longiDouble", ""+longitude);
        exif = new ExifInterface(photo.getCanonicalPath());
        if (exif != null) {
        double latitu = latitude;
        double longitu = longitude;
        double alat = Math.abs(latitu);
        double along = Math.abs(longitu);
        String stringLati = convertDoubleIntoDegree(alat);
        String stringLongi = convertDoubleIntoDegree(along);
        exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, stringLati);            
        exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, stringLongi);
        Log.v("latiString", ""+ stringLati);
        Log.v("longiString", ""+ stringLongi);
        exif.saveAttributes();
        String lati = exif.getAttribute (ExifInterface.TAG_GPS_LATITUDE);  
         String longi = exif.getAttribute (ExifInterface.TAG_GPS_LONGITUDE);  
         Log.v("latiResult", ""+ lati);
         Log.v("longiResult", ""+ longi);

        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    }

}

以下是调用方法的位置......

    Cursor locationCursor = dbHandler.fetchGpsLocationTypeByAttendInfoID(attendInfoId);
      if (locationCursor.getCount()>0) {
        double latitude = dbHandler.fetchDoubleItem(locationCursor,"LATITUDE");
        double longitude = dbHandler.fetchDoubleItem(locationCursor,"LONGITUDE");


            Log.v("latitude",""+latitude);
            Log.v("latitude",""+longitude);     

            try {
                GpsUtils.writeFile(photoFile, latitude, longitude);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

    }
    dbHandler.close();

    cameraHandler.startPreview();

Answer 1

好吧,我很长时间都在努力,但终于明白了.上次我使用它时这个代码工作:

ExifInterface exif = new ExifInterface(imgFile.getCanonicalPath());
              //String latitudeStr = "90/1,12/1,30/1";
              double lat = location.getLatitude();
              double alat = Math.abs(lat);
              String dms = Location.convert(alat, Location.FORMAT_SECONDS);
              String[] splits = dms.split(":");
              String[] secnds = (splits[2]).split("\\.");
              String seconds;
              if(secnds.length==0)
              {
                  seconds = splits[2];
              }
              else
              {
                  seconds = secnds[0];
              }

              String latitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1";
              exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, latitudeStr);

              exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, lat>0?"N":"S");

              double lon = location.getLongitude();
              double alon = Math.abs(lon);


              dms = Location.convert(alon, Location.FORMAT_SECONDS);
              splits = dms.split(":");
              secnds = (splits[2]).split("\\.");

              if(secnds.length==0)
              {
                  seconds = splits[2];
              }
              else
              {
                  seconds = secnds[0];
              }
              String longitudeStr = splits[0] + "/1," + splits[1] + "/1," + seconds + "/1";


              exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, longitudeStr);
              exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, lon>0?"E":"W");

              exif.saveAttributes();

          }