Android解决getExternalStorageDirectory在29后废弃问题(推荐)

// SDCard地址 /storage/emulated/0
  // getExternalStorageDirectory在29已废弃
//  String saveDir = Environment.getExternalStorageDirectory().getAbsolutePath();
  // getExternalFilesDir() 用于获取SDCard/Android/data/你的应用的包名/files/ 目录
  File externalFileRootDir = getExternalFilesDir(null);
  do {
   externalFileRootDir = Objects.requireNonNull(externalFileRootDir).getParentFile();
  } while (Objects.requireNonNull(externalFileRootDir).getAbsolutePath().contains("/Android"));

  String saveDir = Objects.requireNonNull(externalFileRootDir).getAbsolutePath();
  String savePath = saveDir + "/" + Environment.DIRECTORY_DCIM + "/" + filename;