Qr code scanner that scans custom qr code and generates text in a list

MIT App Inventor Help
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#1

I’m trying to make a qr code scanner that when you scan your custom qr code it puts custom text into a pre created list, but the problem is I already have a variable that is assigned to creating a new list, as shown in my list creating code below.

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And I’m not sure how to go about the whole qr code scanning except the bare basics of the
“When btn1 is clicked, do scan”
I most likely need the extension for the qrcode block.
Also what website would be best for making a custom qr code? Some are good, but they have all the good features behind a subscription paywall

#2

Perhaps provide an example/description of what you mean by a "custom qrcode"

The native barcodeScanner should be able to scan most qrCodes....

#3

By a custom qr code, I mean one I generated online that might have my logo on it or something and that when I scan the qr code that it would add text to my list component

#4

Does anyone have any idea how to resolve this?

#5

Not sure what there is to resolve?

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Custom QRCode
(https://chart.googleapis.com/chart?cht=qr&chs=200x200&chld=L%7C2&chl=%27one,two,three%27)

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#6

Wait is it that easy? I was making like blocks on blocks of code, if this works you are my saviour!

#7

Do I need to have a label there? I just want to have the text added directly to the list, it it’s ok if not

#8

The label is just there to show the result

#9

So then if I just wanted the text item to add directly to the list, what would I use instead of the label text?

#10

sorry but I don't understand what's your question.
You want to scan a qrcode and store the result to an list? or retrieve a item from list and generate a qrcode?

#11

Yes, I want to scan a qr code and then whatever text data that is on the qr code goes into a list I made

#12

then in afterscan event, add the result to your list. Open the List drawer, you will find the blocks you need.

#13

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Would this type of code work for getting the qr codes result (aka the text) and adding it as an item to the list?

#14

Iooks good. You can try by yourself.
Two blocks same result.

#15

Neither of my options worked, and I tried tweaking the code in little bits but to no avail. I can’t seem to just simply add a text item to a list from a qr code.
When I tried the method previously shown with the label, it did work and give the data result in text, but not when it’s an item being added to a list.

And I know that it’s nothing to do with the text colour or anything trivial like that, so I’m confused.

#16

you mean you can show the result on a label, but can not add it to the list? how did you do that? show your blocks

#17

Well the blocks below were TIMAI2’s design, and they got the result and then that result showed on the label, but the design flaw was that I would only be able to have 1 piece of text on the label at a time, and if I wanted to scan a different qr code it would erase the 1st text
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So I tried both “get result from barcode scanner” and get result blocks on my code which I showed above, so I don’t get why it won’t get the result and just add the text item to the list.
Is it to do with the way my list and add/remove/clear all buttons are programmed?

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#18

you did not follow my suggestion.

try block like this:
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#19

In the blocks, would I need to have a label 1 block there?

#20

label is just for debug, it will show you if the result is saved or not.
You can choose a label or listview to show the list data.