static void closeQuietly(/*Auto*/Closeable closeable) {
        if (closeable != null) {
            try {
                closeable.close();
            } catch (RuntimeException rethrown) {
                throw rethrown;
            } catch (Exception ignored) {
            }
        }
    }
Deletes the contents of {@code dir}. Throws an IOException if any file
could not be deleted, or if {@code dir} is not a readable directory.
VideoSqlLite/src/main/java/com/yc/videosqllite/disk/DiskUtils.java