file_utils.pde

import beads.*;

static class FileUtils {

  static void loadImagesInto(ArrayList array, String path, PApplet sketch, int rWidth, int rHeight) {
    ArrayList<File> allFiles = FileUtils.listFilesRecursive(path);
    PImage image;

    for (File f: allFiles) {
      if (!f.isDirectory() && !f.getName().startsWith(".")) {
        println("loading image: " + f.getAbsolutePath());

        image = sketch.loadImage(f.getAbsolutePath());
        image.resize(rWidth, rHeight);
        array.add(image);
      }
    }
  }

  static String[] loadSounds(String path) {
    ArrayList<File> allFiles = FileUtils.listFilesRecursive(path);
    ArrayList<String> sampleFileNames = new ArrayList<String>();

    for (File f: allFiles) {
      if (!f.isDirectory() && !f.getName().startsWith(".")) {
        //println("loading sound: " + f.getAbsolutePath());
        sampleFileNames.add(f.getAbsolutePath());
      }
    }

    return sampleFileNames.toArray(new String[sampleFileNames.size()]);
  }

  // This function returns all the files in a directory as an array of Strings
  static String[] listFileNames(String dir) {
    File file = new File(dir);
    if (file.isDirectory()) {
      String names[] = file.list();
      return names;
    } else {
      // If it's not a directory
      return null;
    }
  }
  // This function returns all the files in a directory as an array of File objects
  // This is useful if you want more info about the file
  static File[] listFiles(String dir) {
    File file = new File(dir);
    if (file.isDirectory()) {
      File[] files = file.listFiles();
      return files;
    } else {
      // If it's not a directory
      return null;
    }
  }

  // Function to get a list of all files in a directory and all subdirectories
  static ArrayList<File> listFilesRecursive(String dir) {
     ArrayList<File> fileList = new ArrayList<File>();
     recurseDir(fileList,dir);
     return fileList;
  }

  // Recursive function to traverse subdirectories
  static void recurseDir(ArrayList<File> a, String dir) {
    File file = new File(dir);
    if (file.isDirectory()) {
      // If you want to include directories in the list
      a.add(file);
      File[] subfiles = file.listFiles();
      for (int i = 0; i < subfiles.length; i++) {
        // Call this function on all files in this directory
        recurseDir(a,subfiles[i].getAbsolutePath());
      }
    } else {
      a.add(file);
    }
  }
}