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仅供参考：

引入插件：

file_picker: ^1.3.8

按照返回值，分了三组：

第二组：返回文件
// Pick a single file directly
File file = await FilePicker.getFile(type: FileType.ANY); // will return a File object directly from the selected file

List<String> allNames = filePaths.keys; // List of all file names
List<String> allPaths = filePaths.values; // List of all paths
String someFilePath = filePaths['fileName']; // Access a file path directly by its name (matching a key)