BitMatrix | BitMatrix 以 ArrayBuffer 为基础 , 以 bit | Math library

I have a NxN array A, a NxN array B and a NxN mask (BitMatrix) M. Now I want to copy / assign the values of B to A only for the indices for which M is true. What is the best way to do that?

I have Bitmaps on my project and I want download my bitmap to gallery from url . How Can I ?

I did use this for create QR code

I have generated QR code using com.google.zxing this library. QRCode generations work fine but I want to display Data of QRcode below QRcode.

I want to generate QR code like attached below.

Here is my code.

Below i have created a QR code generator using zxing library. The way it works now is that the user inputs text into the editText and when they tap on the Generate button, it displays a QR code with that text.

My question is, is there a way for me to alter the below code so that it gets the current userID (from firebase Authentication when the users signs up) and prints it to the editText button?

My goal is for the QR code to take the current user that is signed in and get their userID from Firebase and create a QR code based only on the userID.

If so id appreciate any help or if their is an easier way im open to suggestions - Thanks in advance.

CodeQR.java

So i'm trying to make a QR code that when scanned it returns a text. Here's the code.

I have a Newland MT90 barcode reader android mobile. I am creating an application in which I want to scan two barcode. When I am running my code and I press any button first time then it is working fine. At the same time when I press another button then it is replacing Bar Code in both TextView. How can I resolve this ?

I'm creating an app right now and I'm a little confused. I have 2 files, MainActivity and QrCodeGernerator. Im am doing this for a data collection app. The user inputs data into the MainActivity and the shares it with the QrCodeGenerator which then creates a qr code. The issue is the qr code keeps being null. Any help would be appreciated. MainACtivity is first(I've included snipets related to the question not my whole code)

I am trying to create an EAN 13 barcode. I was able to create a Code128 barcode but EAN 13 seems to not work correctly. I have looked around SO and the web but nothing seems to work. Any assistance on resolving this issue is greatly appreciated.

BarcodeActivity.kt

I'm trying to write a colored qrcode using Google's zxing library in Java. It works fine with this example, which seems to use ARGB colors.

Unfortunately I have to use HTML/Hex values for colors in my application, so I tried to figure out how I can build or convert it.

I've alreday build an RGB color and used the alpha value as its prefix. But while a RGB value could be up to 255 - 3 digits, the parameter in MatrixToImageWriter only seems to work with 8 digits. That means that there are only two digits per color.

What Kind of value ist this "MatrixToImageConfig(-10223615,-1)"? Can somebody please explain me those color values or give me an example how to calculate HTML to this?

Thank you!