ExifInterface不更新EXIF标签 [英] ExifInterface doesn't update exif tags

问题描述

我试图改变EXIF标签与ExifInterface。我使用的setAttribute（）并调用saveAttributes（）。标签被暂时保存，那么下一次的旧值仍然存在，一直没有更新...........

例如：

  ExifInterface exifInterface =新ExifInterface（文件路径）;

字符串01 = exifInterface.readAttribute（TAG_ORIENTATION）; // o1的是0

exifInterface.setAttribute（TAG_ORIENTATION，90）;
exifInterface.saveAttributes（）;

字符串O2 = exifInterface.readAttribute（TAG_ORIENTATION）; // O2是90后

//重新启动应用程序，读取属性相同的照片

字符串O3 = exifInterface.readAttribute（TAG_ORIENTATION）; // O3为0再次，前人的精力是90
 

解决方案

万一有人找一个纯粹的Andr​​oid解决方案：原来的code是正确的，但价值 TAG_ORIENTATION 属性，必须在1和8之间的值，如解释了这个页面。

您必须要喝preSS与呼叫该行 readAttribute（）的方法，这种方法不会在ExifInterface类存在。与 exifInterface.getAttribute（ExifInterface.TAG_ORIENTATION，设置defaultValue）如果你想之前和修改后读值。

替换它

I'm trying to change exif tags with ExifInterface. I use setAttribute() and call saveAttributes(). The tag is saved temporarily, then next time the old value is still there and hasn't been updated................

Example:

ExifInterface exifInterface = new ExifInterface(filePath);

String o1 = exifInterface.readAttribute(TAG_ORIENTATION); //o1 is "0"

exifInterface.setAttribute(TAG_ORIENTATION, "90");
exifInterface.saveAttributes();

String o2 = exifInterface.readAttribute(TAG_ORIENTATION); //o2 is "90"

// relaunch app, read attribute for same photo

String o3 = exifInterface.readAttribute(TAG_ORIENTATION); //o3 is "0" again, sould be "90"

解决方案

Just in case someone is looking for a pure android solution: original code is correct, but value of TAG_ORIENTATION attribute must be a value between 1 and 8, as explained in this page.

You must suppress the line with the call to readAttribute() method, this method doesn't exist in the ExifInterface class. Replace it with exifInterface.getAttribute(ExifInterface.TAG_ORIENTATION, defaultValue) if you want to read the value before and after the modification.

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