The activity widget draws an animated indicator that tells the user something is happening in the background. Unlike the ProgressBar it does not communicate how much work is left, so reach for it when the duration of a task is unknown.

Create one with widget.NewActivity(), which takes no parameters. The animation does not run until you call Start(), and it should be stopped with Stop() once the work has completed so that the app is not animating needlessly.

The indicator will fill the space it is given, so it is common to place it in a container that keeps it at its minimum size, such as container.NewCenter(). Remember to hide the widget, or replace it with the results of your work, when the task is done.

  package main

import (
	"time"

	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
)

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("Activity Widget")

	activity := widget.NewActivity()
	activity.Start()

	go func() {
		time.Sleep(time.Second * 5) // pretend to do some work
		activity.Stop()
		activity.Hide()
	}()

	myWindow.SetContent(container.NewCenter(activity))
	myWindow.ShowAndRun()
}