Android-Android下怎么遍历assets录下的子文件夹

此代码未使用递归 ：
import java.io.File;
import java.util.LinkedList;
public class FileSystem {
public static void main(String[] args) {

long a = System.currentTimeMillis();

LinkedList list = new LinkedList();
File dir = new File("c:\\java\\");
File file[] = dir.listFiles();
for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory())
list.add(file[i]);
else
System.out.println(file[i].getAbsolutePath());
}
File tmp;
while (!list.isEmpty()) {
tmp = list.removeFirst();
if (tmp.isDirectory()) {
file = tmp.listFiles();
if (file == null)
continue;
for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory())
list.add(file[i]);
else
System.out.println(file[i].getAbsolutePath());
}
} else {
System.out.println(tmp.getAbsolutePath());
}
}

System.out.println(System.currentTimeMillis() - a);
}
}