查找SD卡上的所有文件

Question

我想找到存储在sdCard上的所有文件.我用过这段代码:

List<File> dir = new ArrayList<File>();
List<File> files = new ArrayList<File>();

   File root = new File (Environment.getExternalStorageDirectory().getAbsolutePath());

    scan(root); // find root directories

    for (File f : dir) { // find in root...
       scan(f);
    }

    Log.i("files", "" + files.size());
    Log.i("dir", "" + dir.size());


}

 public void scan (File path) {

    for (File f : path.listFiles()) {
        if (f.isFile()) {
            files.add(f);
        }
        else {
            dir.add(f);
        }
    }
}

但我有这个异常的问题:"java.util.ConcurrentModificationException"我改变列表(dir)并循环它.ListIterator没有帮助.

Answer 1

在迭代时,您无法添加到列表中.试试这个:

List<File> dir = new ArrayList<File>();
List<File> files = new ArrayList<File>();

   File root = new File (Environment.getExternalStorageDirectory().getAbsolutePath());

    List<File> rootDirs = //... code to find root directories

    for (File f : rootDirs) { // find in root...
       scan(f);
    }

    Log.i("files", "" + files.size());
    Log.i("dir", "" + dir.size());


}

 public void scan (File path) {

    for (File f : path.listFiles()) {
        if (f.isFile()) {
            files.add(f);
        }
        else {
            dir.add(f);
            scan(f);
        }
    }
}