Flutter 中的 flutter_downloader 下载问题

Question

我正在使用flutter_downloader package download files Flutter中的文件。 文件下载到Downloads文件夹中。 文件下载后通知显示下载failed to download并抛出以下错误。 我被这个错误困了将近 2 天，您的帮助将挽救我的一天。

这是代码：

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,
      );
      util.showToast(id.toString());
    } else {
      print('Permission Denied');
    }
  }

这是清单

<provider
            android:name="vn.hunghd.flutterdownloader.FlutterDownloaderInitializer"
            android:authorities="${applicationId}.flutter-downloader-init"
            android:exported="false">
            <!-- changes this number to configure the maximum number of concurrent tasks -->
            <meta-data
                android:name="vn.hunghd.flutterdownloader.MAX_CONCURRENT_TASKS"
                android:value="5" />
        </provider>

这是错误

D/DownloadWorker( 9655): Update too frequently!!!!, this should be dropped
D/DownloadWorker( 9655): Update too frequently!!!!, this should be dropped
D/EGL_emulation( 9655): app_time_stats: avg=19.11ms min=7.88ms max=35.05ms count=53
D/DownloadWorker( 9655): Update notification: {notificationId: 11, title: LRMonoPhase4.mp3, status: RUNNING, progress: 100}
D/DownloadWorker( 9655): Update too frequently!!!!, but it is the final update, we should sleep a second to ensure the update call can be processed
D/EGL_emulation( 9655): app_time_stats: avg=21.50ms min=8.00ms max=35.47ms count=46
D/DownloadWorker( 9655): Update notification: {notificationId: 11, title: LRMonoPhase4.mp3, status: FAILED, progress: -1}
W/System.err( 9655): java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Download/LRMonoPhase4.mp3
W/System.err( 9655):    at androidx.core.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:825)
W/System.err( 9655):    at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:450)
W/System.err( 9655):    at vn.hunghd.flutterdownloader.IntentUtils.buildIntent(IntentUtils.kt:19)
W/System.err( 9655):    at vn.hunghd.flutterdownloader.IntentUtils.validatedFileIntent(IntentUtils.kt:36)
W/System.err( 9655):    at vn.hunghd.flutterdownloader.DownloadWorker.downloadFile(DownloadWorker.kt:445)
W/System.err( 9655):    at vn.hunghd.flutterdownloader.DownloadWorker.doWork(DownloadWorker.kt:208)
W/System.err( 9655):    at androidx.work.Worker$1.run(Worker.java:86)
W/System.err( 9655):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
W/System.err( 9655):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
W/System.err( 9655):    at java.lang.Thread.run(Thread.java:1012)
I/WM-WorkerWrapper( 9655): Worker result FAILURE for Work [ id=69548c69-93cb-47f0-b54e-a23e199f96af, tags={ flutter_download_task, vn.hunghd.flutterdownloader.DownloadWorker } ]

Answer 1

上面的代码有一些奇怪的地方。 首先请使用您的dir.path变量（不要对您的路径进行硬编码）。

然后 flutter 如果您不指定文件名，下载程序可以为该文件生成一个唯一的 id。 如果你想强制使用 name: fileName即使这个文件名不是唯一的也是有效的。 它会生成“相同”通知，您也可以打开该文件。

如果您检查目录，您会看到第二个文件名将是替换文件（文件名 (1)）。

if(statuses[Permission.storage]!.isGranted){
          var dir = await getExternalStorageDirectory();
          if(dir != null) {
            final taskId = await FlutterDownloader.enqueue(
              url: instructionUrl,
              headers: {}, // optional: header send with url (auth token etc)
              savedDir: dir.path,
              /*fileName:"uniquename",*/
              showNotification: true, // show download progress in status bar (for Android)
              saveInPublicStorage: true,
              openFileFromNotification: true, // click on notification to open downloaded file (for Android)
            );
          }