qrscan | QR codes in PDF files | QRCode Processing library

im so confuse why my sliverappbar doesnt collapse when i'm scrolling listviewbuilder

so what i want is Appbar will colapse but the bottom is pinned, also when im scrolling to up the appbar will show'n

I have a page, on this page I show data cards. I receive this data on request(getTaskDetails). I get an array of data and show this data on the cards. But the problem is that I want to make these queries every 20 seconds. That the data which will be on my page are updated. Here is my code:

I'm trying to encrypt URL parameter ID in ASP.NET. I have built a simple project with IDataProtector. But I am getting a Null reference error in the line pointed in the sample code.

Controller:

I want to link a TextView value to my database item ID. And then get the children that are under my database item in a TextView.

When I scan a Barcode with the value 7, I also want the to populate a TextView with for example toolName from the database Item with ID 7.

I've tried and tried, but I don't know how to complete this.

MainActivity:

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

I create page with bottom_nav_bar, but now i cant open it in emulator, bcs error Error: A value of type '_MainPage' can't be assigned to a variable of type 'Widget'.

Problem here: '/Main': (BuildContext context) => _MainPage(),

Here code:

I want to navigate to QrScan screen once the icons get pressed, instead, I got an error!! setState() or markNeedsBuild() called during build I want to navigate to that screen and get data from QR Codes, after that I want this data to be shown on another screen!

It says:

This Overlay widget cannot be marked as needing to build because the framework is already in the process of building widgets. A widget can be marked as needing to be built during the build phase only if one of its ancestors is currently building. This exception is allowed because the framework builds parent widgets before children, which means a dirty descendant will always be built. Otherwise, the framework might not visit this widget during this build phase.

The widget on which setState() or markNeedsBuild() was called was: Overlay- [LabeledGlobalKey#a5a46]

The widget which was currently being built when the offending call wasmade was: builder

i wanna make a Basic Plus int1+ int2 = int3 like this one, my first Integer is my Local TextFeld-myController , also its the Number what i wrote on the Phone. Second Integer is my Aktuel number in Flutter RTDP , Third Integer is First Integer + Second Integer , The function working like this right now,

App run, Admin Layout, Get UID from a Scan QR Packet - then get Point from UID , and Get Point 2 from Point, its actually work but if i make a Basic Plus then its showing to me a wrong result, I got 150 Point in RTDP , and i wanna add 50 Point more to my Customer Account, its adding 1000 Point, and Result 1150 , can somebody say to me why is not working this Math Function ? I tried it with num - double -int , but not worked. Thanks. Regards

I want to open my app from a URL from QRScan , which is common when your custom URL looks like this "myappname://productid". my problem is that I want my app to open from a Website type URL which is something like this "https://myappname.com/productid"

How can i achieve this ?