I want to get all mp3 files from the android storage device in my audio player appi in flutter and show them in the listview.builder

import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:path_provider/path_provider.dart';

class Songlist extends StatefulWidget {
@override
_SonglistState createState() => _SonglistState();
}

class _SonglistState extends State<Songlist> {
@override
void initState() {
super.initState();
initlist();
}

void initlist() async {
if (await Permission.storage.request().isGranted) {
  Directory dir = await getExternalStorageDirectory();
  List<FileSystemEntity> files;
  files = dir.listSync(recursive: true, followLinks: false);
}
}

@override
Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(
    title: Text("Your Media"),
    backgroundColor: mycolor,
  ),
  /* body: new ListView.builder(
      padding: const EdgeInsets.all(16.0),
      itemCount: files.length,
      itemBuilder: (context, i) {
        return buildRow(_files.elementAt(i).path);
      }), */
  );
}
}