flutter_downloader 1.1.3

  • README.md
  • Example
  • Installing
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Flutter Downloader

pub package

A plugin for creating and managing download tasks. Supports iOS and Android.

This plugin is based on WorkManager in Android and NSURLSessionDownloadTask in iOS to run download task in background mode.

iOS integration

Required configuration:

Note: following steps requires to open your ios project in Xcode.

  • Enable background mode.
  • Add sqlite library.

Optional configuration:

  • Support HTTP request: if you want to download file with HTTP request, you need to disable Apple Transport Security (ATS) feature. There're two options:
  1. Disable ATS for a specific domain only: (add following codes to your Info.plist file)
      <!-- add this key to enable subdomains such as sub.yourserver.com -->
      <!-- add this key to allow standard HTTP requests, thus negating the ATS -->
      <!-- add this key to specify the minimum TLS version to accept -->
  1. Completely disable ATS: (add following codes to your Info.plist file)
  • Configure maximum number of concurrent tasks: the plugin allows 3 download tasks running at a moment by default (if you enqueue more than 3 tasks, there're only 3 tasks running, other tasks are put in pending state). You can change this number by adding following codes to your Info.plist file.
<!-- changes this number to configure the maximum number of concurrent tasks -->
  • Localize notification messages: the plugin will send a notification message to notify user in case all files are downloaded while your application is not running in foreground. This message is English by default. You can localize this message by adding and localizing following message in Info.plist file. (you can find the detail of Info.plist localization in this link)
<string>All files have been downloaded</string>

Android integration

Required configuration:

  • In order to handle click action on notification to open the downloaded file on Android, you need to add some additional configurations. Add the following codes to your AndroidManifest.xml:


  • You have to save your downloaded files in external storage (where the other applications have permission to read your files)
  • The downloaded files are only able to be opened if your device has at least an application that can read these file types (mp3, pdf, etc)

Optional configuration:

  • Configure maximum number of concurrent tasks: the plugin depends on WorkManager library and WorkManager depends on the number of available processor to configure the maximum number of tasks running at a moment. You can setup a fixed number for this configuration by adding following codes to your AndroidManifest.xml:
     android:exported="false" />

     <!-- changes this number to configure the maximum number of concurrent tasks -->
         android:value="5" />
  • Localize notification messages: you can localize notification messages of download progress by localizing following messages. (you can find the detail of string localization in Android in this link)
<string name="flutter_downloader_notification_started">Download started</string>
<string name="flutter_downloader_notification_in_progress">Download in progress</string>
<string name="flutter_downloader_notification_canceled">Download canceled</string>
<string name="flutter_downloader_notification_failed">Download failed</string>
<string name="flutter_downloader_notification_complete">Download complete</string>
<string name="flutter_downloader_notification_paused">Download paused</string>
  • Firebase integration: there's a conflict problem between WorkManager and Firebase library (related to Guava library). The problem is expected to be resolved in new version of Guava and Gradle build tools. For now, you can work around it by adding some codes to your build.gradle (in android folder).
allprojects {

    configurations.all {
        exclude group: 'com.google.guava', module: 'failureaccess'

        resolutionStrategy {
            eachDependency { details ->
                if('guava' == details.requested.name) {
                    details.useVersion '27.0-android'


Import package:

import 'package:flutter_downloader/flutter_downloader.dart';

Create new download task:

final taskId = await FlutterDownloader.enqueue(
  url: 'your download link',
  savedDir: 'the path of directory where you want to save downloaded files',
  showNotification: true, // show download progress in status bar (for Android)
  openFileFromNotification: true, // click on notification to open downloaded file (for Android)

Update download progress:

FlutterDownloader.registerCallback((id, status, progress) {
  // code to update your UI

Load all tasks:

final tasks = await FlutterDownloader.loadTasks();

Load tasks with conditions:

final tasks = await FlutterDownloader.loadTasksWithRawQuery(query: query);
  • Note: In order to parse data into DownloadTask object successfully, you should load data with all fields from DB (in the other word, use: SELECT * ). For example:
SELECT * FROM task WHERE status=3
  • Note: the following is the schema of task table where this plugin stores tasks information
	`task_id`	VARCHAR ( 256 ),
	`url`	TEXT,
	`status`	INTEGER DEFAULT 0,
	`progress`	INTEGER DEFAULT 0,
	`file_name`	TEXT,
	`saved_dir`	TEXT,
	`resumable`	TINYINT DEFAULT 0,
	`headers`	TEXT,
	`show_notification`	TINYINT DEFAULT 0,
	`open_file_from_notification`	TINYINT DEFAULT 0,
	`time_created`	INTEGER DEFAULT 0

Cancel a task:

FlutterDownloader.cancel(taskId: taskId);

Cancel all tasks:


Pause a task:

FlutterDownloader.pause(taskId: taskId);

Resume a task:

FlutterDownloader.resume(taskId: taskId);
  • Note: resume() will return a new taskId corresponding to a new background task that is created to continue the download process. You should replace the original taskId (that is marked as paused status) by this new taskId to continue tracking the download progress.

Retry a failed task:

FlutterDownloader.retry(taskId: taskId);
  • Note: retry() will return a new taskId (like resume())

Open and preview a downloaded file:

FlutterDownloader.open(taskId: taskId);
  • Note: in Android, you can only open a downloaded file if it is placed in the external storage and there's at least one application that can read that file type on your device.


If you encounter any problems feel free to open an issue. If you feel the library is missing a feature, please raise a ticket on Github. Pull request are also welcome.

1.1.3 - 18.11.2019

  • Android: fix bug NullPointerException of saveFilePath

1.1.2 - 14.11.2018

  • Android: fix typo error
  • iOS: catch HTTP status code in case of error

1.1.1 - 12.11.2018

  • correct README instruction

1.1.0 - 12.11.2018

  • Android: upgrade WorkManager library to version v1.0.0-alpha11
  • BREAKING CHANGE: initialize() is removed (to deal with the change of the initialization of WorkManager in v1.0.0-alpha11). The plugin initializes itself with default configurations. If you would like to change the default configuration, you can follows the instruction in README.md

1.0.6 - 28.10.2018

  • fix bug related to filename

1.0.5 - 22.10.2018

  • Android: re-config dependencies

1.0.4 - 20.10.2018

  • Android: upgrade WorkManager to v1.0.0-alpha10

1.0.3 - 29.09.2018

  • Android: upgrade compile sdk version to 28

1.0.2 - 20.09.2018

  • Fixed Flutter Community badge.

1.0.1 - 20.09.2018

1.0.0 - 09.09.2018

  • NEW features: initialize, loadTasksWithRawQuery, pause, resume, retry, open
  • IMPORTANT: the plugin must be initialized by initialize() at first
  • BREAKING CHANGE: clickToOpenDownloadedFile now renames to openFileFromNotification (to prevent confusing from open feature). Static property maximumConcurrentTask has been removed, this configuration now moves into initialize() method.
  • full support SQLite on both Android and iOS side, the plugin now itself manages its states persistently and exposes loadTasksWithRawQuery api that helps developers to load tasks from SQLite database with customized conditions
  • support localizing Android notification messages with messages parameter of initialize() method
  • full support opening and previewing downloaded file with open() method
  • (iOS integration) no need to override application:handleEventsForBackgroundURLSession:completionHandler: manually anymore, the plugin now itself takes responsibility for handling it

0.1.1 - 29.08.2018

  • fix bugs: SQLite leak
  • new feature: support configuration of the maximum of concurrent download tasks
  • upgrade WorkManager to v1.0.0-alpha08

0.1.0 - 12.08.2018

  • add: handle click on notification to open downloaded file (for Android)

0.0.9 - 10.08.2018

  • re-config to support Dart2

0.0.8 - 10.08.2018

  • upgrade WorkManager to v1.0.0-alpha06
  • fix bug: disable sound on notifications

0.0.7 - 28.06.2018

  • upgrade WorkManager to v1.0.0-alpha04

0.0.6 - 28.06.2018

  • upgrade WorkManager to v1.0.0-alpha03
  • change default value of showNotification to true (it makes sense on Android 8.0 and above, it helps our tasks not to be killed by system when the app goes to background)

0.0.5 - 22.06.2018

  • update metadata

0.0.4 - 15.06.2018

  • fix bug: Worker finished with FAILURE on Android API 26 and above

0.0.3 - 11.06.2018

  • support HTTP headers

0.0.2 - 08.06.2018

  • correct README document

0.0.1 - 07.06.2018

  • initial release.



Demonstrates how to use the flutter_downloader plugin.

Getting Started

For help getting started with Flutter, view our online documentation.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_downloader: ^1.1.3

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flutter_downloader/flutter_downloader.dart';
Version Uploaded Documentation Archive
1.1.3 Nov 18, 2018 Go to the documentation of flutter_downloader 1.1.3 Download flutter_downloader 1.1.3 archive
1.1.2 Nov 14, 2018 Go to the documentation of flutter_downloader 1.1.2 Download flutter_downloader 1.1.2 archive
1.1.1 Nov 12, 2018 Go to the documentation of flutter_downloader 1.1.1 Download flutter_downloader 1.1.1 archive
1.1.0 Nov 12, 2018 Go to the documentation of flutter_downloader 1.1.0 Download flutter_downloader 1.1.0 archive
1.0.6 Oct 28, 2018 Go to the documentation of flutter_downloader 1.0.6 Download flutter_downloader 1.0.6 archive
1.0.5 Oct 22, 2018 Go to the documentation of flutter_downloader 1.0.5 Download flutter_downloader 1.0.5 archive
1.0.4 Oct 20, 2018 Go to the documentation of flutter_downloader 1.0.4 Download flutter_downloader 1.0.4 archive
1.0.3 Sep 29, 2018 Go to the documentation of flutter_downloader 1.0.3 Download flutter_downloader 1.0.3 archive
1.0.2 Sep 20, 2018 Go to the documentation of flutter_downloader 1.0.2 Download flutter_downloader 1.0.2 archive
1.0.1 Sep 20, 2018 Go to the documentation of flutter_downloader 1.0.1 Download flutter_downloader 1.0.1 archive

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We analyzed this package on Dec 5, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.1.0
  • pana: 0.12.7
  • Flutter: 1.0.0


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.20.1 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies