Sorry for interrupting.
I want to create a app, about use true QR code to get the Bingo lattice.
Are any of you free at the moment? I need a hand with..
Welcome to the community!
Are you talking about the BINGO lattice described here> Bingo-card Lattices, Equal-tempered Musical Scales or something else?
..and how do you expect this to work using a QR code?
Your question needs a more detailed explanation about what you hope to achieve.
I want to hold a scavenger hunt at elementary school.
Students can find some QR code around trees or flowers.
There are some question about trees/floewrs on every bingo lattice.
When students find the true answer(QR code),they will get the lattice.
Thanks for your reply.
Students can use the BarcodeScanner to scan bar codes on posters you 'hide' around trees or flowers. The scanner can read the QR code messages.
Apparently 'bingo lattice' has a special meaning for you. Unfortunately, we do not know what you mean by it. When students find the QR code, they 'will get the lattice' ... is that a prize or an award or is it the card the QR code is printed on?
What have you tried so far? Depending on how the game works, there are numerous ways it can be scored. You can post results using a FirebaseDB or CloudDB or GoogleSpreadsheet databases if that is necessary. Students can merely write down the numbers or message they find in the QR code.
We are glad to help. However, we need a better explanation about how the scavenger hunt is supposed to work.
Here are some ways you might use the bar code scanner in a scavenger hunt game https://livebook.manning.com/book/hello-app-inventor/chapter-10/85
When students get bingo lattice, they can play bingo game.
um..just like there is a 4*4 size bingo game, from number 1 to 16
when I choose NO.1 lattice, i'll see a question..
Question: which plant has 3 kinds color flower?
then i go to find the true plant and scan the QR code.
I can get NO.1 lattice, and so on..
The other rule is as same as bingo game.
I am new here. do you have any sample like that?
I would appreciate it if you could take a moment to explain that to me.
Thanks for your reply.
Certainly you can make a game like that. I do not have a specific example.
Make QR codes with messages using the online tool at https://eslkidsgames.com/quick-qr-code-generator .
I made an example QR code and a simple scanner you can copy.
This is the QR code made with the online tool and a graphics program on my PC.
Scan the QR code and with the scanner app below to see the message. You will probably want to do something similar but using questions.
This is the entire App Inventor scanning app I just made.
barcodeScannerScavengerHunt.aia (1.8 KB)
The Bingo cards are the next part of your Project. Someone might make a recommendation how to do that. There are some examples in the MIT gallery of projects making a BINGO game. You might adapt one of these to work with your QR cards ... https://gallery-appinventor-mit-edu.ezproxy.canberra.edu.au/search/time/bingo
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Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro and the aia files for the projects in the book are here: http://www.appinventor.org/bookFiles
How to do a lot of basic things with App Inventor are described here: http://www.appinventor.org/content/howDoYou/eventHandling .
Also look here http://kio4.com/appinventor/index.htm and here http://www.imagnity.com/tutorial-index/ for more tutorials.
Learn about components http://ai2.appinventor.mit.edu.ezproxy.canberra.edu.au/reference/components/
and visit the Library http://appinventor.mit.edu.ezproxy.canberra.edu.au/explore/library Help>Library on the MENU
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okay, I will read these resources.Thanks for your reply.
And I have another question..
Can the app use without WI-FI?
In my school, it isn't full with WI-FI everywhere.
If can, what should i do on these plant questions?
Yes. The app does not require a wifi connection to do the scan. Use the aia to make your Project. Build the apk and install on your Android and scan the QR code. You should see something like
This is your scavenger game. You know the rules so only you can make the questions. Here is an example of someone using QR codes to ask questions https://zahnerhistory.com/2015/05/5-steps-to-make-quizzes-with-qr-codes.html ; and another example that might help you decide how you want to make your questions / answers using QR codes https://www.laketech.org/wp-content/uploads/2015/01/QR-Code-Treasure-Hunt-Generator.pdf
Good luck. 
okay, thanks for your reply.