import 'package:filex/filex.dart';
import 'package:path_provider/path_provider.dart';

dir = await getApplicationDocumentsDirectory();
final controller = FilexController(path: dir.path);
Filex(controller: controller);

import 'package:filex/filex.dart';

Filex(
  compact: true,
  directory: Directory("some_dir_path"),
  directoryTrailingBuilder: (context, item) {
    return GestureDetector(
      child: Padding(
        padding: const EdgeInsets.fromLTRB(0, 0, 3.0, 0),
        child: Icon(Icons.file_download,
          color: Colors.grey, size: 20.0)),
        onTap: () => doSomething(item));
})

class FileExplorer extends StatelessWidget {
@override
Widget build(BuildContext context) {
   final controller = FilexController(path: dir.path);
   return Scaffold(
      appBar: AppBar(
        title: const Text("Files"),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.add),
            onPressed: () => controller.addDirectory(context),
          )
        ],
      ),
      body: Filex(
        controller: controller,
        actions: <PredefinedAction>[PredefinedAction.delete],
      ),
    );
  }
}

Filex(
    controller: controller,
    actions: <PredefinedAction>[PredefinedAction.delete],
    extraActions: <FilexSlidableAction>[
    FilexSlidableAction(
        name: "My action",
        iconData: Icons.file_upload,
        color: Colors.blue,
        onTap: customAction,
    )
    ],
)

void customAction(BuildContext context, DirectoryItem item) {
    // action here
}

StreamSubscription<List<DirectoryItem>> _sub;
_sub = controller.changefeed.listen((items) {
  // do something
});