flutter - 如何在 flutter 上读取外部存储？尝试读取音乐文件

Question

我试图创建一个音乐应用程序作为我的第一个应用程序，想知道我将如何继续从外部存储读取文件，我看到了一些关于 path_provider 的东西，但这并没有真正让我在任何地方，对基本逻辑有任何帮助吗？

Answer 1

要列出所有文件或文件夹，您必须使用 flutter_file_manager、path 和 path_provider_ex flutter 包。在 pubspec.yaml 文件中添加以下几行以将此包添加到您的依赖项中。

dependencies:
  flutter:
    sdk: flutter
  path: ^1.6.4
  path_provider_ex: ^1.0.1
  flutter_file_manager: ^0.2.0

在 android/app/src/main/AndroidManifest.xml 标签前添加 dd 读/写权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

如果您仍然收到 Permission Denied 错误，请在 AndroidManifest.xml 文件中添加以下行。

<application
      android:requestLegacyExternalStorage="true"

全码:

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_file_manager/flutter_file_manager.dart';
import 'package:path_provider_ex/path_provider_ex.dart';
//import package files

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return  MaterialApp(
          home: MyFileList(), //call MyFile List 
    );
  }
}

//apply this class on home: attribute at MaterialApp()
class MyFileList extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    return _MyFileList();
  }
}

class _MyFileList extends State<MyFileList>{
  var files;
 
  void getFiles() async { //asyn function to get list of files
      List<StorageInfo> storageInfo = await PathProviderEx.getStorageInfo();
      var root = storageInfo[0].rootDir; //storageInfo[1] for SD card, geting the root directory
      var fm = FileManager(root: Directory(root)); //
      files = await fm.filesTree( 
      //set fm.dirsTree() for directory/folder tree list
        excludedPaths: ["/storage/emulated/0/Android"],
        extensions: ["png", "pdf"] //optional, to filter files, remove to list all,
        //remove this if your are grabbing folder list
      );
      setState(() {}); //update the UI
  }

  @override
  void initState() {
    getFiles(); //call getFiles() function on initial state. 
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title:Text("File/Folder list from SD Card"),
        backgroundColor: Colors.redAccent
      ),
      body:files == null? Text("Searching Files"):
           ListView.builder(  //if file/folder list is grabbed, then show here
              itemCount: files?.length ?? 0,
              itemBuilder: (context, index) {
                    return Card(
                      child:ListTile(
                         title: Text(files[index].path.split('/').last),
                         leading: Icon(Icons.image),
                         trailing: Icon(Icons.delete, color: Colors.redAccent,),
                      )
                    );
              },
          )
    );
  }
}