Qr : Read and Create Qr/Bar Code offline

[vknow360]

@William_Harris

QR code to downloads and/or documents

You will have to provide a full path of the directory where you want to save the barcode.

@vknow360

The path to save in Download will be /storage/emulated/0/Download.

[Thor_Remoblas]

Hello!

I'm new to the App Inventor scene, and I wanted to try generating a QR code from your extension. Unfortunately, when I connect to the companion app, I get this error

Unable to load file: http://ai2.appinventor.mit.edu/ode/download/file/5724481720287232/assets/external_comps/com.sunny.qr/classes.jar

on the companion app. Is there somewhere I can download this file? All I have is the AIX file.

Thanks.

[Taifun]

@Thor_Remoblas

when I connect to the companion app, I get this error

Unable to load file:

what happens, if you restart the companion app?
did you upload loads of assets in the media section of your project?

Taifun

[Thor_Remoblas]

@Taifun

what happens, if you restart the companion app?

When I restarted the companion app yesterday, I got the same error.

@Taifun

did you upload loads of assets in the media section of your project?

Actually, all I have is an image, a text box, a button, and a QR Code generator extension. This also happened with some other QR Code generator extensions I was testing.

All is well today though. I just shut down the computer after about a week of hibernating. Truly, a reboot is the only thing we need most of the times.

Thanks for your response.

[Nieves_Joshua]

When I try this program made by sir vknow360 and change the path to /storage/emulated/0 nothing happens.
I might be confused

[Anke]

@Nieves_Joshua

change the path to /storage/emulated/0 nothing happens

You can no longer save a file in the root dir or an arbitrary folder of the external storage (on Android 11+). Save it in one of the Shared folders or the ASD.

See also here:

Some basics on Android storage system

From an Android point of view there are an → Internal Storage and an → External Storage . 1. Internal Storage The Internal Storage can only be accessed with a rooted device. 1.1 The app package is saved in /data/data/<packageName>/ In order to be able to debug your app, AI2 saves the assets for → Companion on devices with Android ≥ 10 (API ≥ 29): /storage/emulated/0/Android/data/edu.mit.appinventor.aicompanion3/files/assets/ Android < 10 : /storage/emulated/0/Android/data/edu.mit…

[111619]

How to return QR code picture after I created the QR code？

[Gordon_Lu]

It is in the BarCodeGenerated event. Use the filePath to get the file path in the Android storage.

Did you read the main post and the documentation? The usage is right there.

[111619]

I used this method,but its image has not changed.

[Gordon_Lu]

Please show your blocks then.

[111619]

A.aia (33.1 KB)

[Gordon_Lu]

As @Anke mentioned, starting from Android 11, do not save the file in /storage/emulated/0.

B.aia (67.9 KB)

[111619]

OK, thanks

[111619]

Can I convert my business card into QR code?

[vknow360]

Unfortunately, not possible with this extension.

[seyed_ali_mousavi_al]

how create a barcode?

[vknow360]

You can get a list of supported bar formats with BarcodeFormats method.

Qr : Read and Create Qr/Bar Code offline

Testing this in companion, I get a list of formats: ["AZTEC", "CODABAR", "CODE_39", "CODE_93", "CODE_128", "DATA_MATRIX", "EAN_8", "EAN_13", "ITF", "MAXICODE", "PDF_417", "QR_CODE", "RSS_14", "RSS_EXPANDED", "UPC_A", "UPC_E", "UPC_EAN_EXTENSION"] However, only QR_CODE and PDF_417 generate an image/code. Is there are reason for this? (tested on Android 10 and Android 11 devices)

[seyed_ali_mousavi_al]

plese tell this informaton in read me on github

[seyed_ali_mousavi_al]

plese tell this informaton in read me on github thanks

[vknow360]

Sure, but did it solve your issue?