File can't be downloaded on android but works well on ios

[781flyingdutchman]

File can't be downloaded on android but works well on ios

[dJani97]

Thanks, I followed this solution and now opening files works well: #85

[396501293]

                final task = DownloadTask(
                    url: downloadStartRequest.url.toString(),
                    filename: downloadStartRequest
                            .url.queryParameters['fullFileName'] ??
                        '附件'); // define your task

                pd ??= ProgressDialog(context: context);

                pd!.show(
                  max: 100,
                  msg: localizations.downloadStatusRunning,
                  progressType: ProgressType.valuable,
                  progressBgColor: Colors.transparent,
                  hideValue: true,
                  closeWithDelay: 1000,
                  cancel: Cancel(
                    cancelClicked: () {
                      FileDownloader().cancelTaskWithId(task.taskId);
                    },
                  ),
                  completed: Completed(
                      completedMsg: localizations.downloadStatusComplete),
                  // onStatusChanged:
                );

                TaskStatusUpdate result = await FileDownloader().download(
                  task,
                );

                if (result.status == TaskStatus.complete) {
                  pd!.update(
                    value: 100,
                  );
                  FileDownloader().openFile(task: task);
                }

I alter the code to this. Still not work on android. It stuck in FileDownloader.dowload() without response.
The console logs "Enqueuing task with id xxxx"

[781flyingdutchman]

Hi, thanks for trying the package. A few thoughts:

1. You need to do something with the result of the call to download, for example to capture failures/errors - you shouldn't just ignore the return value
2. You need to make sure your url and urlQueryParameters are url encoded - it's not clear from the example that you do that and it will fail if you don't

[396501293]

 bool result = await FileDownloader().enqueue(task);

    if (result) {
      pd!.update(
        value: 100,
      );
      FileDownloader().openFile(task: task);
    }

I just modify "download" to "enqueue" and successfully downloaded. But another error show:

Failed to open file /data/user/0/com.example.prime_layer_flutter/app_flutter/image3303709270623290067.jpg: java.lang.IllegalArgumentException: Failed to find configured root that contains /data/data/com.example.prime_layer_flutter/app_flutter/image3303709270623290067.jpg

Did I miss any configurations?

[781flyingdutchman]

For some reason (that I don't understand) on Android you can't open a file that is downloaded in the documents directory (the default for a Task). Download to a different directory (e.g. temporary) and it should work.

[781flyingdutchman]

Looking at your code again, it seems like you try to open them file right after the call to enqueue. Enqueue does just that: puts the request in the queue. It doesn't compete the request. You need to listen to updates or register a handler.
Please read the documentation.

[396501293]

 @override
  void initState() {
    super.initState();
    FileDownloader().registerCallbacks(
      taskStatusCallback: myDownloadStatusCallback,
    );
  }

  void myDownloadStatusCallback(TaskStatusUpdate update) {
    if (update.status == TaskStatus.complete) {
      pd!.update(
        value: 100,
      );

      FileDownloader().openFile(task: update.task);
    }
}

I register a task status callback handler. But only the first state(enqueued) update was processed. The next state update did not occur.

[396501293]

I run the example. Same problem.

[781flyingdutchman]

If the example doesn't move past enqueued then that means the task does not complete, not even with an error (which would show in the example app).

Have you modified the example app to load a different file, or does the example app download the original file from the repo? If the original, there has to be an issue with how your device reaches the network (that app has always worked, so if it doesn't complete it means there is an issue with the network). If you've modified the example to load 'your' file then I think there is an issue with how you have defined your task, eg urlencoding etc.

Perhaps if you can provide:

1. The version of the downloader you are using
2. The version of Android
3. Logs from the device (including those labeled TaskWorker and BackgroundDownloaderPlugin, as those are on the Kotlin side)

[dJani97]

I also get the same error when I tap on a notification to open the file, or when I call .openFile(task: result.task):
java.lang.IllegalArgumentException: Failed to find configured root that contains ...

See my logs, the file does get downloaded:

I/BackgroundDownloader(25786): Enqueuing task with id 1152481977
I/flutter (25786): PXL_20230207_101333993.jpg status: TaskStatus.enqueued
I/TaskWorker(25786): Starting task with taskId 1152481977
I/flutter (25786): PXL_20230207_101333993.jpg status: TaskStatus.running
I/flutter (25786): PXL_20230207_101333993.jpg progress: 0.0%
I/TaskWorker(25786): Successfully downloaded taskId 1152481977 to /data/user/0/com.myapp.staging/app_flutter/PXL_20230207_101333993.jpg
I/flutter (25786): PXL_20230207_101333993.jpg progress: 100.0%
I/flutter (25786): PXL_20230207_101333993.jpg status: TaskStatus.complete
I/flutter (25786): Success!
I/WM-WorkerWrapper(25786): Worker result SUCCESS for Work [ id=bcdad762-6b32-4894-a235-9b0371f59dbd, tags={ com.bbflight.background_downloader.TaskWorker, BackgroundDownloader, taskId=1152481977, group=await } ]

Flutter 3.10.6
background_downloader: 7.9.4
Tested on both Android 11 & 13

[781flyingdutchman]

Hi, per comment above, I think you're running into this:

For some reason (that I don't understand) on Android you can't open a file that is downloaded in the documents directory (the default for a Task). Download to a different directory (e.g. temporary) and it should work.