将文件从 SD 卡移动到应用程序内部数据（存储）

Question

Background

I need to take the following file and move it to my apps internal storage.

mnt/sdcard/downloads

I can successfully achieve this by copying the file using the following, then deleting the file from the SD card.

writer = new BufferedWriter(new FileWriter(file));
writer.write(data);
writer.close();

While copying a large file I need double the space (which I don't have).

Question

Is it possible to "move" a file (changing the directory) opposed to copy delete

Other information Looking into the matter I've found:

public boolean renameTo (File newPath)

doc

Both paths are on the same mount point. On Android, applications are most likely to hit this restriction when attempting to copy between internal storage and an SD card. quote taken from here

I don't know if I can get both paths on the same mount point.

Answer 1

听起来您正在处理非常大的文件，因此您可能会研究某种渐进式缩小/增长另一种类型的操作 - 尽管大概只有在您可以检测到没有足够空间用于完整副本的情况下。

Answer 2

I've tried to do the opposite previously (internal to SD, same thing) the copy then delete process is the only one I found to work. I guess it makes sense that you cannot just 'rename' since the files are on different physical storage areas (not sure if the same applies to some 'virtual' SD cards on some Android devices). If they're on different storage spaces, you cannot just swap out the pointers on the file header.