What is workmanager?

Schedule background jobs with workmanager.

What is workmanager?

The workmanager package is used to schedule background tasks that run even when the app is closed. It is initialized with Workmanager().initialize and tasks are registered. The package wraps the WorkManager API on Android and the BGTaskScheduler API on iOS.

Workmanager().initialize(callbackDispatcher, isInDebugMode: true);

Workmanager initialization

Before using Workmanager you call the initialize method. Its first parameter is the background callback, callbackDispatcher. This call is made in the app's main function and runs only once.

void main() {
  Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
}

Exercise Initialize Workmanager

Define a callbackDispatcher function (takes task as parameter, returns true). In main call Workmanager().initialize and print 'ok'.

Show example solution

class Workmanager {
  void initialize(Function dispatcher, {bool isInDebugMode = false}) {}
}

bool callbackDispatcher(String task) {
  return true;
}

void main() {
  Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
  print('ok');
}

Test yourself

What does the workmanager package provide?
- Drawing the user interface
- Speeding up database queries
- Running animations in the foreground
- Scheduling background tasks while the app is closed
Show answer

Scheduling background tasks while the app is closed — workmanager schedules background tasks that can run even when the app is closed; it has nothing to do with animations, UI drawing, or database speedups.

Initialize Workmanager

Workmanager().____(callbackDispatcher, isInDebugMode: true);

Show answer

Workmanager().initialize(callbackDispatcher, isInDebugMode: true);

workmanager parts

Workmanager

Background task package
initialize

Initialization method
callbackDispatcher

Background callback
background

Background

Next lesson: callbackDispatcher

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies