我在做一个应用程序中，我不得不删除SD卡最近添加的mp3文件。其中歌曲保存的格式为：

I am making an app in which I have to delete the recently added mp3 file in sdcard. The format in which the song is saved is:

Songhello_17_26.amr

其中 17_26 是当歌曲被添加的时间。谁能帮助我如何删除SD卡最近添加的文件。我的意思是说，我想要删除的时间意味着最新添加的文件应该被删除。 任何帮助将AP preciated。

where 17_26 is the time when song was added. Can anyone help me how delete the recently added file in sdcard. I mean to say that I want to delete the time means the latest added file should get deleted. Any help will be appreciated.

推荐答案

由于它指出here,你不能做到这一点直接，你首先需要获得的文件列表 File.listFiles（），比较， File.lastModified（）， Arrays.sort（）删除。

As it states here, you cant do that directly, you first need to get list of files File.listFiles(), Comparator,File.lastModified(), Arrays.sort() and delete.

编辑：

File f = new File(path);

File [] files = f.listFiles();

Arrays.sort( files, new Comparator()
{
    public int compare(Object o1, Object o2) {

        if (((File)o1).lastModified() > ((File)o2).lastModified()) {
            return -1;
        } else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
            return +1;
        } else {
            return 0;
        }
    }

}); 

要删除最近的一次：

 files[0].delete();