qr_code | QR code encoder and decoder in Rust | QRCode Processing library

I've been trying to fix this for weeks but failed, when I click on login (indicated with the id "lin") to open a new activity the app crash, i don't know if it's a problem with the Intent or something else, here is the code. The manifest should be ok so I think it's a problem in the MainActivity with Intent ab. The other activity is called Qrcode. I tried to change appcompatactivty to activity but didn't work, i don't really know what to do.

Edit: I posted the code of the qrcode activity, i got it from the answers of this question : Android, How to read QR code in my application?, only for educational purpose of course.

Edit 2: logcat posted, sorry for any issues with asking this question, it's the first question i ask here.

Logcat

When I run makemigrations error is occurred. Here is models.py

I'm using QR Code Scanner in Xamarin App, when it scans the qr code, there are some operation it does which takes about a minute, while it's performing operation, I want to show a loading dialog on the screen. But, it isn't showing on the screen, and elsewhere in the app, it's working perfectly.

Code

so here is the thing. after scanning 3 different barcodes. i have created a button that will show the value of those. So it is like this.

I have a web app (using flask and python) that can read a QR code from a live video stream (using opencv). Is it possible to save the data that has been read to my MySQL database without stopping the stream? Every time I try to call the function to save the data, the stream hangs, giving me a NoneType error. I tried calling the same function outside the stream and it works.

In my model.py, I have this function. :

I'm zxing to estimate the 4 corner points of the QR Code. Following is my code to estimate the corner points.

I am seeking to create a QR code upon completion of a profile creation form for a user, and saving the QR image to a FileField. The FileField is also used for a profile_image field which already saves the image from the form to S3. I would like to do the same for the QR code (saving to S3 bucket).

Using Segno I am able to generate the QR code. How am I able to create an image of it and save it to S3 via the models.py FileField?

My code is as follows for the models.py and views.py files. Any help is appreciated.

models.py

I'm building a 2FA application, which scans a QR code. Then it parses the uri inside QR code and returns a totp code. However, I have a problem closing the CupertinoActionSheet using Navigator.of(context).pop().

I want it to work like that:

1. When a user taps on "add" button, the Action Sheet shows up.
2. When user clicks on "Scan QR code", the Action Sheet must close and then proceed with scanning.

Here's what it looks like:

Here's the error that shows ups when I have the code below: "Looking up a deactivated widget's ancestor is unsafe. At this point the state of the widget's element tree is no longer stable. To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling dependOnInheritedWidgetOfExactType() in the widget's didChangeDependencies() method."

Ok, so i have a "template.prn" that get's filled with info with a PHP script i made. The PHP generates multiple FR for every 1 data values the user gives to the script

template.prn