如何让我的应用程序请求存储权限并访问我的设备存储空间？颤动

Question

我正在 flutter 上制作 Instagram 克隆，并尝试访问设备的存储空间，以便用户可以选择要发布的图像，但应用程序设置中的权限显示为灰色。我正在遵循 youtube 上的教程，并且我遵循了该人的代码，但我的代码不起作用。我只在运行 android 11 的模拟器上收到权限请求，但在运行 android 14 的物理设备上，我没有收到任何权限请求，并且权限在应用程序设置中显示为灰色。我的代码如下。 （我已经将使用权限添加到 Android 清单中）

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:photo_manager/photo_manager.dart';


class NewPostScreen extends StatefulWidget {
  const NewPostScreen({Key? key}) : super(key: key);

  @override
  State<NewPostScreen> createState() => _NewPostScreenState();
}

class _NewPostScreenState extends State<NewPostScreen> {
  final List<Widget> _mediaList = [];
  final List<File> path = [];
  File? _file;
  int currentPage = 0;
  int? lastPage;

  _fetchNewMedia() async {
    lastPage = currentPage;
    final PermissionState ps = await PhotoManager.requestPermissionExtend();
    if (ps.isAuth) {
      List<AssetPathEntity> album =
          await PhotoManager.getAssetPathList(onlyAll: true);
      List<AssetEntity> media =
          await album[0].getAssetListPaged(page: currentPage, size: 60);

      for (var asset in media) {
        if (asset.type == AssetType.image) {
          final file = await asset.file;
          if (file != null) {
            path.add(File(file.path));
            _file = path[0];
          }
        }
      }
      List<Widget> temp = [];
      for (var asset in media) {
        temp.add(FutureBuilder(
            future: asset.thumbnailDataWithSize(const ThumbnailSize(
              200,
              200,
            )),
            builder: (context, snapshot) {
              print('Thumbnail data: ${snapshot.data}');
              if (snapshot.connectionState == ConnectionState.done) {
                return Container(
                  child: Stack(
                    children: [
                      Positioned.fill(
                          child: Image.memory(
                        snapshot.data!,
                        fit: BoxFit.cover,
                      ))
                    ],
                  ),
                );
              }
              return Container();
            }));
      }
      setState(() {
        _mediaList.addAll(temp);
        currentPage++;
      });
    }
  }

  @override
  void initState() {
    super.initState();
    _fetchNewMedia();
  }

  int indexx = 0;

  //@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).brightness == Brightness.light
            ? Colors.white
            : Colors.black,
        title: const Text(
          'New Post',
          style: TextStyle(
            //color: Colors.lightBlueAccent,
            fontSize: 16,
            fontWeight: FontWeight.w500,
          ),
        ),
        toolbarHeight: 40,
        // elevation: 10,
        centerTitle: true,
        automaticallyImplyLeading: false,
      ),
      
      body: SafeArea(
        child: SingleChildScrollView(
          child: Column(
            children: [
              SizedBox(
                height: 410,
                child: GridView.builder(
                  gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: 1,
                      mainAxisSpacing: 1,
                      crossAxisSpacing: 1),
                  itemBuilder: (context, index) {
                    return _mediaList[indexx];
                  },
                ),
              ),
              Container(
                width: double.infinity,
                height: 40,
                //color: Colors.white,
                child: Row(
                  children: [
                    SizedBox(
                      width: 10,
                    ),
                    Text(
                      'Recent',
                      style: TextStyle(fontWeight: FontWeight.w500),
                    )
                  ],
                ),
              ),
              GridView.builder(
                shrinkWrap: true,
                itemCount: _mediaList.length,
                gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                    crossAxisCount: 3, mainAxisSpacing: 1, crossAxisSpacing: 2),
                itemBuilder: (context, index) {
                  return GestureDetector(onTap: () {
                    setState(() {
                      indexx = index;
                    });
                  }, child: _mediaList[index],
                  );
                },
              )
            ],
          ),
        ),
      ),
    );
  }
}

Answer 1

添加 API 33 和 API 34 的 Android 附加功能，如此处所述。添加它们后，它开始正常工作。

Android 14 (API 34) 额外配置

当面向 Android 14（API 级别 34）时，需要将以下额外配置添加到清单中：

<manifest>
    <uses-permission android:name="android.permission.READ_MEDIA_VISUAL_USER_SELECTED" />  <!-- If you want to use the limited access feature. -->
</manifest>

Android 13 (API 33) 额外配置

当面向 Android 13（API 级别 33）时，需要将以下额外配置添加到清单中：

<manifest>
    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" /> <!-- If you want to read images-->
    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" /> <!-- If you want to read videos-->
    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" /> <!-- If you want to read audio-->
</manifest>