QrCodeScanner | 融合Zxing和Zbar扫码框架，对条形码二维码高兼容，扫码效率奇高！

I implemented firebase MLKit to scan QRCode, it is scanning, but it is scanning all QRcode on screen. I need to scan only QRCode that are captured on the center (has arrow ImageView on the center), how can I do it?

I tried to crop on the Analisys function (inside analysisUseCase?.setAnalyzer)

imageProxy.cropRect()

I tried to crop on the processImageProxy function. But with no success, I think that I can't crop with this

i'm new in React Native and stuck to passing data to another page. in this case i want to sent data from QR Reader to another Page.

this is my code on first screen:

I'm looking for a few days how I can read a QR code using ML Kit and CameraX. The process of the input image returns always a failure "IllegalStateException: Image is already closed". I have looked on different forums, but I can not find what I'm doing wrong. I think I'm following the Google documentation, but it won't work.

This is what I'm doing in my MainActivity:

1. I create a textureView which shows me the input of my camera
2. I start my camera (after checking the necessary rights)
3. I setup a "preview" use case
4. I setup a "Image Analysis" use case
5. I set an analyzer which creates an InputImage which is passed to the Barcode scanner process
6. Set my LifeCycle with the use cases "preview" and "image analysis"

I'm using CameraX version "1.0.0-alpha04" and "com.google.mlkit:barcode-scanning:16.0.3".

build.gradle

I use the library zxing-android-embedded in my Android App. Before calling initiateScan() method to start the scanner from my activity, I set a class variable scanedItemId to know on which item I clicked to scan.

My issue is that when the scanner activity finished, it goes back to my activity, but in a new instance and not the initial one (I checked with a break point in the onCreate method). So, my class variable is null. What can I do to keep my initial activity instance live and be sure the scanner goes back to it?

I use the library zxing-android-embedded in my Android App. Before calling initiateScan() method to start the scanner from my activity, I set a class variable scanedItemId to know on which item I clicked to scan:

I was trying to make a QR code marker like this pic below.

So I'm wondering how to make those 4 corners instead of a full border marker.

I was currently using react-native-qrcode-scanner.

The default marker is like this:

and here is the code that I have:

Could not find multidex.jar (com.android.support:multidex:1.0.2). Searched in the following locations: https://jcenter.bintray.com/com/android/support/multidex/1.0.2/multidex

I have just installed latest version of Android Studio 3.1.3 When i tried to sync my project it shows failed to resolve : multidex

Also i tried https://jcenter.bintray.com/com/android/support/multidex/1.0.2/multidex this link which shows 404 error. Please help

Project Level :

Current code:

fairly new to React Native. I have read the stack navigator docs and still don't get how to do this.

So I have a bottom tab navigator, and I want to implement a stack navigator in one of the tabs, so I can navigate from the main tab screen to the second screen, but from the second screen to third screen I cannot navigate as it can't find the variable "navigation", which is understandable because I'm using different js files for each screen. How do I pass over the navigation variable to the other screen? Below is my code:

OrderScreen.js: