如何在Android Q及更高版本中创建目录

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this,
            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
            REQUEST_CODE);
}

File directory = new File(Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_DOCUMENTS), "myDirectory");
if (!directory.exists()) {
    directory.mkdirs();
}

File directory = new File(getExternalFilesDir(Environment.DIRECTORY_DOCUMENTS), "myDirectory");
if (!directory.exists()) {
    directory.mkdirs();
}