JournalViewActivity.java 文件源码

private File createFileName(String prefix, String ext) throws
        IOException {
    DateTime now = DateTime.now();
    DateTimeFormatter fmt = DateTimeFormat.forPattern
            ("yyyyMMdd-HHmmss");
    File cacheDir = getExternalCacheDir();
    File media = File.createTempFile(prefix + "-" + fmt.print(now),
            ext, cacheDir);
    return media;
}