How to cancel network.download when changing scene using storyboard?

Solar2D General Questions/Discussion
#1

Hi!

For example when downloading user images from Facebook I use the network.download function. I check for every pic if it’s already in the systems.DocumentsDirectory, if not then start the download.

How can I make sure all downloads are canceled when a user leaves the scene?

If not all images are downloaded, the pics will get shown on the newly entered scene. Which is very annoying.

thx

#2

Best would be to wait until the download is finished before allowing the user to do anything else.

When download starts: native.setActivityIndicator(true)

When download finished: native.setActivityIndicator(false)

#3

You can also check if you are still in the scene when download is finished.

if storyboard.getCurrentSceneName == “mySceneName” then

   – show image

end

#4

Thx, but what will happen with a bad connection… the user will get stuck on the screen and needs to shutdown the app hard?

I see there is network.cancel function, maybe there is a way to loop tru all the running download events?

#5

You have an error listener in the NetworkListener. See http://docs.coronalabs.com/daily/api/library/network/download.html

If it times out or there is an error it will call it. So you have to hide your activity indicator in there as well.

#6

Good point, thx gonna try this out.

#7

Best would be to wait until the download is finished before allowing the user to do anything else.

When download starts: native.setActivityIndicator(true)

When download finished: native.setActivityIndicator(false)

#8

You can also check if you are still in the scene when download is finished.

if storyboard.getCurrentSceneName == “mySceneName” then

   – show image

end

#9

Thx, but what will happen with a bad connection… the user will get stuck on the screen and needs to shutdown the app hard?

I see there is network.cancel function, maybe there is a way to loop tru all the running download events?

#10

You have an error listener in the NetworkListener. See http://docs.coronalabs.com/daily/api/library/network/download.html

If it times out or there is an error it will call it. So you have to hide your activity indicator in there as well.

#11

Good point, thx gonna try this out.