android 获取所有SD卡目录

//返回sd卡路径
public static List<String> getStorageDirectories(Context context) {
  StorageManager sm = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
  List<String> pathList = new ArrayList<>();
  File exDirFile = Environment.getExternalStorageDirectory();
  String externalStorageDir = "";
  if (exDirFile != null) {
    externalStorageDir = exDirFile.getAbsolutePath();
  }
  try {
    String[] paths = (String[]) sm.getClass().getMethod("getVolumePaths", null).invoke(sm, null);
    if (paths != null && paths.length > 0) {
      for (String path : paths) {
        File file = new File(path);
        if (!TextUtils.isEmpty(path) && !path.equalsIgnoreCase(externalStorageDir) && file.isDirectory()) {
          //判断是否目录，并排除系统虚拟出来的目录
          pathList.add(path);
        }
      }
    }
  } catch (Exception e) {
    e.printStackTrace();
  }

  return pathList;
}