重命名一个已存在的文件

Question

有两个文件：

File src = new File("loc/xyz.mp3") 和 File dst=new File("loc/xyz1.mp3")。

现在我想将xyz.mp3重命名为dst，同时删除src文件，怎么才能实现？我试过的代码：

src.delete();
dst.renameTo(src);

在应用的背景中异步运行，第一次执行时成功了，但是第二次就崩溃了。

请帮忙解决一下，谢谢。

Answer 1

根据文档说明：

Renames the file denoted by this abstract pathname.
Many aspects of the behavior of this method are inherently platform-dependent: The rename operation might not be able to move a file from one filesystem to another, it might not be atomic, and it might not succeed if a file with the destination abstract pathname already exists. The return value should always be checked to make sure that the rename operation was successful.

在AsyncTask中，不能保证src和dst。检测一下src.exists() && dst.exists()可能帮助你避免错误。 使用deleteOnExit也可以。