如何通过此元数据提取器库查看exif标签的数组？

Question

找不到零件，以便以标记形式打印出方法getTagName（）的整个数组，而不是字符串。

https://drewnoakes.com/code/exif/

try { 
    InputStream is = new URL("http://www.dbituser1.dbitmobileappchallenge.com/uploadimage1/uploads/sample_0%20-%20Copy.jpg").openStream(); 
    BufferedInputStream bis = new BufferedInputStream(is); 
    Metadata metadata = ImageMetadataReader.readMetadata(bis); 

    for (Directory directory : metadata.getDirectories()) { 
     for (Tag tag : directory.getTags()) { 
      //Toast.makeText(DetailsActivity.this, "" + tag.getTagName() +": " + tag.getDescription(), Toast.LENGTH_LONG).show(); 
      if (tag.getTagName().contains("ISO")) { 
       TextView text = (TextView) findViewById(R.id.textView); 
       text.setText("ISO: " + tag.getDescription()); 
      } 

      if (tag.getTagName().contains("Exposure")) { 
       Toast.makeText(DetailsActivity.this, "This is the Date: " + tag.getDescription(), Toast.LENGTH_LONG).show(); 
       //TextView text = (TextView) findViewById(R.id.textView1); 
       //text.setText("Exposure: " + tag.getDescription()); 
      } 
     } 
    } 
} catch (ImageProcessingException e) { 
} catch (IOException e) { 
} 

Answer 1

如果你只需要两个值，不重复所有的人。相反，请直接拔出您要查找的特定目录，然后取出标签。

从您的代码看起来您​​需要ExifSubIfdDirectory。

ExifSubIFDDirectory subIfd = metadata.getFirstDirectoryOfType(ExifSubIFDDirectory.class); 

if (subIfd != null) { 
    // NOTE these values could be null if they aren't present in the image's metadata 
    Integer iso = subIfd.getInteger(ExifSubIFDDirectory.TAG_ISO_EQUIVALENT); 
    Double exposureTime = subIfd.getDoubleObject(ExifSubIFDDirectory.TAG_EXPOSURE_TIME); 
}