您可以将库中的文件复制到应用程序的文件系统沙箱中，您可以在其中使用它们进行任何操作.但是，您的应用程序无法修改沙箱外部的文件.这包括图库中的文件.

You can copy files from the gallery into your application's file system sandbox, where you can do anything you want with them. However, your application can't modify files outside the sandbox. This includes files in the gallery.

此答案所说，似乎不是定义的在那里删除照片的方法.

As this answer says, there doesn't appear to be a method defined for deleting photos there.