加载图像到ExifInterface [英] Load image into ExifInterface

问题描述

我试着加载一个硬$ C $光盘镜像到Android的ExifInterface，但它似乎无法找到它。这就是我想：

Im trying to load a hardcoded image into the android ExifInterface but it can't seem to find it. This is what I am trying:

ExifInterface mExif = new ExifInterface("images/IMG_20150411_194725.jpg");

图像位于RES / images目录中。有什么我需要为Android做的，把它捡起来？

The images is located in res/images directory. Is there something i need to do for android to pick it up?

推荐答案

首先， RES / 通常是指资源。不仅那些只存在作为开发机器上的文件，但你不能创造新的资源目录，并且有一个名为没什么<$​​ C $ C> RES /图像/ Android中。

First, res/ usually refers to resources. Not only do those only exist as files on your development machine, but you cannot invent new resource directories, and there is nothing named res/images/ in Android.

二， ExifInterface 只加载文件系统删除文件，而不是资源。毕竟，这将是完全没有意义的一个开发商想用 ExifInterface 上的资源。资源是只读的，所以你不能使用 ExifInterface 修改EXIF头中的资源。和而不是浪费用户的时间，CPU和电池读数只读映像文件提取元数据，开发人员会做到这一点的时间提前，将这些数据在其他地方，如字符串或整数的资源。

Second, ExifInterface only loads files off of the filesystem, not resources. After all, it would be completely pointless for a developer to want to use ExifInterface on a resource. Resources are read-only, so you cannot use ExifInterface to modify EXIF headers in a resource. And rather than wasting users' time, CPU, and battery reading in a read-only image file to extract metadata, developers would do that ahead of time, putting that data somewhere else, such as string or integer resources.

三， ExifInterface 需要在文件系统中的文件的完全限定路径。所以，即使你有一个图像/ 目录中的文件系统中的某个位置的文件（例如，使用创建的 getFilesDir（）作为为基础），您需要提供该文件的完全合格的路径。

Third, ExifInterface needs a fully-qualified path to the file on the filesystem. So even if you have a file somewhere in the filesystem in an images/ directory (e.g., created using getFilesDir() as as base), you would need to provide a fully-qualified path to that file.

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