import 'package:path/path.dart';
File file = new File("/dir1/dir2/file.ext");
String basename = basename(file.path);
# file.ext
void main() {
var completePath = "/dev/dart/work/hello/app.dart";
var fileName = (completePath.split('/').last);
var filePath = completePath.replaceAll("/$fileName", '');
print(fileName);
print(filePath);
}