background_downloader

The url and urlQueryParameters passed to a BackgroundDownloadTask or Request must be encoded if necessary. For example, if the url or query parameters contain a space, it must be replaced with %20 per urlencoding

Changes:

• Added option to use a POST request: setting the post field to a String or UInt8List passes that data to the server using the POST method to obtain your file
• Added request method, taking a Request object (a superclass of BackgroundDownloadTask), for simple server requests, where you process the server response directly (i.e. not in a file).
• Refactored Android Kotlin code and made small improvement to the fix for issue with Firebase plugin onMethodCall handler

Fix for issue with Firebase plugin onMethodCall handler

Added option to automatically retry failed downloads. This is a breaking change, though for most existing implementations no or very little change is required.

The main change is the addition of enqueued and waitingToRetry status to the DownloadTaskStatus enum (and removal of undefined). As a result, when checking a DownloadStatusUpdate (e.g. using a switch statement) you need to cover these new cases (and for existing implementations can typically just ignore them). The progressUpdate equivalent of waitingToRetry is a value of -4.0, but for existing implementations this will never be emitted, as they won't have retries.

The second change is that a task now emits enqueued when enqueued, and running once the actual download (on the native platform) starts. In existing applications this can generally be ignored, but it allows for more precise status updates.

To use automatic retries, simply set the retries field of the BackgroundDownloadTask to an integer between 0 and 10. A normal download (without the need for retries) will follow status updates from enqueued -> running -> complete (or notFound). If retries has been set and the task fails, the sequence will be enqueued -> running -> waitingToRetry -> enqueued -> running -> complete (if the second try succeeds, or more retries if needed).

Fix for issue with Firebase plugin onMethodCall handler

Added option to set requiresWiFi on the BackgroundDownloadTask, which ensures the task won't start downloading unless a WiFi network is available. By default requiresWiFi is false, and downloads will use the cellular (or metered) network if WiFi is not available, which may incur cost.

Added allTasks method to get a list of running tasks. Use allTaskIds to get a list of taskIds only.

Added note to README referring to an issue ( and fix) where the firebase plugin interferes with the downloader

Improved example app, updated documentation and fixed minor Android bug

Added downloadBatch method to enqueue and wait for completion of a batch of downloads

Added option to use an event listener instead of (or in addition to) callbacks

Added FileDownloader.download as a convenience method for simple downloads. This method's Future completes only after the download has completed or failed, and can be used for simple downloads where status and progress checking is not required.

Added headers and metaData fields to the BackgroundDownloadTask. Headers will be added to the request, and metaData is ignored but may be helpful to the user

Replaced Ktor client with a basic Kotlin implementation

Initial release