get number of files in a directory and its subdirectories

Question

using this code

new File(\"/mnt/sdcard/folder\").listFiles().length

returns a sum of folders and files in a particular directory without ca

Answer 1

you will have to do a recursive search over your files. Use `File#isDrirectory()´ to check if a file is a directory and traverse the file tree down.

Answer 2

Try this.

int count = 0;
getFile("/mnt/sdcard/folder/");

private void getFile(String dirPath) {
    File f = new File(dirPath);
    File[] files = f.listFiles();

    if (files != null)
    for (int i = 0; i < files.length; i++) {
        count++;
        File file = files[i];

        if (file.isDirectory()) {   
             getFile(file.getAbsolutePath()); 
        }
    }
}

It may help you.

Answer 3

public Integer countFiles(File folder, Integer count) {
    File[] files = folder.listFiles();
    for (File file: files) {
        if (file.isFile()) {
            count++;
        } else {
            countFiles(file, count);
        }
    }

    return count;
}

Usage:

Integer count = countFiles(new File("your/path"), Integer.valuOf(0));

Answer 4

Using Java 8 NIO:

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Test {

  public long fileCount(Path dir) { 
    return Files.walk(dir)
                .parallel()
                .filter(p -> !p.toFile().isDirectory())
                .count();
  }

  public void main(String... args) {
    Path dir = Paths.get(args[0]);
    long count = fileCount(dir);

    System.out.println(args[0] + " has " + count + " files");
  }

}

Answer 5

You can use recursion.

public static int getFilesCount(File file) {
  File[] files = file.listFiles();
  int count = 0;
  for (File f : files)
    if (f.isDirectory())
      count += getFilesCount(f);
    else
      count++;

  return count;
}

Answer 6

Just for the record, you may also use iteration instead of recursion:

public static int countFiles(final File dir) {
    final ArrayDeque<File> dirs = new ArrayDeque<>();
    dirs.add(dir);
    int cnt = 0;
    while (!dirs.isEmpty()) {
        final File[] files = dirs.poll().listFiles();
        for (final File f: files)
            if (f.isDirectory())
                dirs.add(f);
            else
                ++cnt;
    }
    return cnt;
}

In this implementation I'm using ArrayDeque but you can use any Queue or any List for the job.