flutter_downloader下载完成后通知错误显示失败且点击无跳转求助

我使用flutter_downloader: ^1.9.1实现文件下载，文件能成功保存到Download文件夹，但存在两个问题：

• 下载完成后通知错误显示为失败状态
• 点击该通知无法跳转至下载文件夹

下载代码 #

void _download(String url) async {
    final status = await Permission.storage.request();

    if (status.isGranted) {
      final externalDir = await getExternalStorageDirectory();

      final id = await FlutterDownloader.enqueue(
        fileName: "LRMonoPhase4.mp3",
        url: 'https://www.kozco.com/tech/LRMonoPhase4.mp3',
        savedDir: '/storage/emulated/0/Download',
        showNotification: true,
        openFileFromNotification: true,
      );
    } else {
      print('Permission Denied');
    }
  }

Android Provider配置 #

<provider
    android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
    android:authorities="im.mingguang.mingguang_app.flutter_downloader.provider"
    android:exported="false"
    android:grantUriPermissions="true"
    android:requestLegacyExternalStorage="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths"/>
</provider>

日志片段 #

D/DownloadWorker( 4447): DownloadWorker{url=https://www.kozco.com/tech/LRMonoPhase4.mp3,filename=LRMonoPhase4.mp3,savedDir=/data/user/0/com.rsoft.salezrobot/app_flutter,header={},isResume=false,status=ENQUEUED
D/DownloadWorker( 4447): Update notification: {notificationId: 10, title: LRMonoPhase4.mp3, status: RUNNING, progress: 0}
D/DownloadWorker( 4447): Open connection to https://www.kozco.com/tech/LRMonoPhase4.mp3
D/DownloadWorker( 4447): Headers = {}
D/TrafficStats( 4447): tagSocket(172) with statsTag=0xffffffff, statsUid=-1
D/EGL_emulation( 4447): app_time_stats: avg=21.56ms min=5.27ms max=97.80ms count=47
I/trustAllHosts( 4447): checkServerTrusted
D/DownloadWorker( 4447): Content-Type = audio/mpeg
D/DownloadWorker( 4447): Content-Length = 931630
D/DownloadWorker( 4447): Charset = null
D/DownloadWorker( 4447): fileName = LRMonoPhase4.mp3
D/DownloadWorker( 4447): Update notification: {notificationId: 10, title: LRMonoPhase4.mp3, status: RUNNING, progress: 1}
D/EGL_emulation( 4447): app_time_stats: avg=19.26ms min=7.83ms max=39.89ms count=52
D/DownloadWorker( 4447): Update too frequently!!!!, this should be dropped
D/DownloadWorker( 4447): Update too frequently!!!!, this should be dropped

相关截图 #

• 通知显示失败状态：
• 文件已成功保存到Download文件夹：

解决方案 #

1. 通知显示失败问题 #

从日志可见，代码指定的/storage/emulated/0/Download被实际重定向到了/data/user/0/com.rsoft.salezrobot/app_flutter，这是Android 10+存储权限限制导致的路径不一致。

• 确保AndroidManifest.xml的<application>标签下添加android:requestLegacyExternalStorage="true"（仅在provider中配置无效）
• 用path_provider获取正确的公共下载目录，替换硬编码路径：

  import 'package:path_provider/path_provider.dart';
  
  // 替换原路径获取代码
  final downloadDir = await getExternalStoragePublicDirectory(DirectoryDownloads);
  final savedDir = downloadDir.path;
  

• Android 13+需额外请求Permission.downloads权限，使用permission_handler最新版本处理权限逻辑。

2. 通知点击无法跳转问题 #

核心是File Provider配置不匹配，导致无法正确访问下载文件：

• 检查res/xml/provider_paths.xml，确保包含Download目录的访问路径：

  <?xml version="1.0" encoding="utf-8"?>
  <paths xmlns:android="http://schemas.android.com/apk/res/android">
      <external-path name="external_files" path="."/>
      <external-files-path name="download_files" path="Download"/>
  </paths>
  

• 确认android:authorities的值与应用包名一致，且Provider在<application>标签下正确注册
• 避免硬编码路径，确保File Provider能正确解析文件URI

额外建议 #

• 将flutter_downloader升级到最新稳定版，旧版本存在较多通知和路径相关的已知bug
• 测试前清理应用缓存并重新安装，避免旧配置残留

内容的提问来源于stack exchange，提问作者Anandh Krishnan