zxing | Android-ZXing 二维码扫描和生成二维码Demo

The development team is using Tomcat 7 on Ubuntu server. I downloaded that Tomcat from the server and deployed locally and it works okay.

Now, I developed a spring-boot module, wrapped it into WAR file and wanted to deploy it in the same Tomcat. However, catalina.bat run fails to start my spring-boot application. The original application (called ROOT) is working fine.

My pom.xml:

After upgrading to android 12, the application is not compiling. It shows

"Manifest merger failed with multiple errors, see logs"

Error showing in Merged manifest:

Merging Errors: Error: android:exported needs to be explicitly specified for . Apps targeting Android 12 and higher are required to specify an explicit value for android:exported when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details. main manifest (this file)

I have set all the activity with android:exported="false". But it is still showing this issue.

My manifest file:

I am trying to implement barcode scanning in my Xamarin form, but no success.
I am able to get the camera working, but I don't see the red line on the screen and it simply refuses to scan anything

I tried this answer. I can see thru my camera, but no red line appears. But I can put the torch on and off

XAML code:

I am generate qrCode using zxing. Ordinary QR codes can be created, but I want to create QR codes that are empty in the center or contain LOGO in the center. Can we create a QR code that recognizes well regardless of the size of LOGO? I want to like this image

My pom includes the itext7-core artifact.

Im new in xamarin, Im trying to make a Button that opens a scanner form that scans qr/barcode that is MVVM method. Im trying to get the result and display it into a label. this is my best guest but it doesn't work, hope someone can help.

I am trying to use the ZXing Intent Integrator and Library to scan barcodes into my app. When I click the scan button, it will always prompt to install the Barcode Scanner app. Even when I already have it installed. Per the docmentation I call the scanner using

I am using ZXing.Net.Mobile in a Xamarin.Forms project. It works fine on iOS, but on Android, the first time I use the scanner, I get the camera permissions popup, and grant them.

There is no image from the camera immediately after the permissions. If I quit the app and re-launch, the camera works fine from that point forward. How can I get it to work right away? Even if I close my view, dispose and re-initialize it, it still doesn't work until the app restarts.

Here is relevant code:

Firt thing, this is not the case like in this link

Apache FOP in a Java Applet - No ImagePreloader found for data

Since all images (including PNG) are displayed normally except the one generated dinamically by a Spring mapping.

So, that said, I have the following situation. I have a controller with this mapping: