Java recursive delete dir

AndroidManifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

recursive-delete-dir

public static boolean deleteDir(File dir) {
  if (dir.isDirectory()) {
    String[] children = dir.list();
    for (int i=0; i<children.length; i++) {
      boolean success = deleteDir(new File(dir, children[i]));
      if (!success) {
        return false;
      }
    }
  }
  // The directory is now empty so delete it
  return dir.delete();
}