Генерация qr кода android studio

How to Generate QR Code in Android?

QR codes are used in many apps for displaying data in machine-readable form. These codes are used to represent data in a secured manner that is readable only by machines and not by humans. We have seen many apps that provide QR codes that and we can scan that QR codes with our mobile device. In this article, we will take a look at how we can generate a QR Code for our app. So for implementing this feature we will be using a library from GitHub.

Implementation of QR Code Generator in Android

We will be creating a simple QR Code generator app in which we will be adding data from the app and generate a QR Code that will display the data inside it. Below is the sample GIF in which you will get a basic idea of what we are going to do in this article. Not that we are using Java language for building this project.

Step by Step Implementation

Step 1: Create a New Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.

Step 2: Add dependency to build.gradle(Module:app)

Navigate to the Gradle Scripts > build.gradle(Module:app) and add the below dependency in the dependencies section.

Now sync the project from the top right corner option of Sync now.

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Генерируем и сканируем QR/BAR коды

В статье приводится короткий пример, как встроить в своё приложение генератор и/или сканер QR кодов (или штрих-кодов), и тем самым облегчить себе задачу передачи с устройства на устройство коротких объемов информации.

QR-коды пришли на смену устаревшим штрих-кодам (далее вместо ‘Bar code’) и все плотнее входят в нашу жизнь, их используют в десятках различных решений от передачи ссылок на сайт, до сложных систем авторизаций и покупок.

Подробно узнать что такое QR-код можно в подробностях узнать из статьи Читаем QR код

Для выполнения поставленой задачи нам понадобится 2 библиотеки из двух проектов:

• ZBar bar code reader
• ZXing («Zebra Crossing»)

Сканируем QR-коды

Тут есть одна особенность, result = scanner.scanImage(codeImage) иногда возвращет корректный результат, даже когда нет никакого QR-кода перед камерой. То есть, камера иногда распознает что то даже в обычной размытой картинке. Поэтому рекомендую ввести дополнительную проверку на размер прочитанного кода или на соответствие ожидаемому формату.

Генерируем QR-коды

В этом случае уже будут задействованы ресурсы библиотеки ZXing.
Входные парамеры encodeAsBitmap: текст или код для кодирования, стандарт в который мы кодируем, размеры картинки на выходе.

Что на счёт Штрих-кодов?

Сканер понимает все виды штрих-кодов без каких-либо модификаций, из коробки.

Генератор же модифицируется не просто, а очень просто:
в функцию encodeAsBitmap передаем в поле format вместо BarcodeFormat.QR_CODE, что нибудь вроде BarcodeFormat.CODE_128, что будет соответствовать штрих-коду стандарта Code 128

Пару советов напоследок

Имейте ввиду, что работа с камерой может иметь свои особенности на разных платформах

Замечено, что метод
постоянно теряет память (есть Memory Leak) ввиду того что буфер кадра постоянно создается и очищается на каждом новом превью кадре с камеры.
Для того, что бы этого избежать, есть возможность использовать CallbackBuffer для выделения статичного буфера под превью кадры.
Это действительно помогает избавится от утечек памяти и даже увеличивает фрейм-рейт у превью картинки с камеры.
Но!, нашлась модель телефона, которая ни в какую не захотела работать с превью буфером и не факт что не найдутся еще, поэтому оставил в примере более надежный способ.

Генерация штрихкодов имеет ограничения согласно выбранному стандарту: максимальный размер в байтах, разрешенные смиволы и т.д.
Изучите особенности линейных штрикодов, для того что бы обеспечить совместимость отображаемых вами штрих-кодов с магазинными сканерами

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Generate QR Code Using Zxing Android Studio Programmatically

Hello, geeks. Welcome to Generate QR Code Using Zxing Android Studio example tutorial.

You will learn how to generate QR code in Generate QR Code Using Zxing Android Studio example.

You can generate QR Code from any string using ZXing library.

We will also save generated QRCode to internal storage.

First check output then we will develop Generate QR Code Using Zxing Android Studio example.

Download Source Code For Generate QR Code Using Zxing Android Tutorial

Creating generate create QR Code ZXing Android step by step

Step 1: Create a new project in Android Studio.

Step 2: Updating build.gradle(Module:app) file

add following code into dependencies<>

Step 3: Adding colors in colors.xml

Move to res->values->colors.xml directory and add following

Step 4: Updating AndroidManifest.xml file

Note: If you are targeting SDK version above 22 (Above Lollipop) then you need to ask a user for granting runtime permissions. Check marshmallow runtime permission for more information.

Final code for AndroidManifest.xml file

Step 5: Updating activity_main.xml file

Copy and paste below source code in activity_main.xml file

Step 6: Preparing MainActivity.java class

Add following source code in MainActivity.java class

Step 7: Description of MainActivity.java

Following method saves the QRcode image.

IMAGE_DIRECTORY is the folder in which image is saved.

Image will be saved in the internal memory of android device.

You can change the value of IMAGE_DIRECTORY variable to customize the location to which you want to save generated QRCode image.

Below method will generate QRCode from given string.

Above method will use various classes of ZXing library to create QRCode from given string.

Implementation of a button click.

If there is no string is entered, a message is printed to enter a string.

Otherwise, QRcode is generated and saved.

So all for generate create QR code ZXing Android Studio programmatically example tutorial. Thank you.

45 thoughts on “Generate QR Code Using Zxing Android Studio Programmatically”

Your King bro, thanks 🙂

Sorry, You are King bro 🙂

Please let me know how to send a payment request to the customer for UPI payment using android

Thanks,
please consider to change the code below as it is consuming a lot of resources :

Instead of this in the loop:
for loop
getResources().getColor(R.color.black):getResources().getColor(R.color.white);

do this:
int bgColor = getResources().getColor(R.color.black);
int color = getResources().getColor(R.color.white);

for loop
bgColor:color;

sir not save in folder
pls help me

Give all required permissions if you have not given yet.

sir It not showing Qr I give all the permission

Is your app crashing? or are you able to scan barcode..

yes my app is crashing

It is very help to me. Thanks bro.
Be happy!

Hey,, i generate a QR using this one. my problem is…. how to make the generated QR pop out in my screen?

bitmap = TextToImageEncode(etqr.getText().toString());
This code is generate QR, you can used it in dialog pop up

How to add Images in the center of the QR code using this method ?

WHERE TO ADD IMAGE ? GENERATED QRCODE ITSELF IS AN IMAGE.

i have one requirement.
Ex if i am taking one image how to capture inside image value,on that value i will shows in edittext.

Please explain in details. I can not understand what you really want?

how to insert the image from qrcode into database? thank you 🙂

Do you want to upload qrcode image to server darabase or in sqlite?

getresources().getcolor() is deprecated
The Best Approach to use :
ContextCompat.getColor(context, R.color.color_name)

Thank you very much for useful attention!

How can you make a qrcode generator with multiple line texts for input? For example you may want the user to input Name, Age and Gender and you may want it to convert to a single qr code

You can do this by writing all the details in one line. For example : Vincent Van Fundal 25 Male

Where is the rest of the article? It stops at the beginning of step 4.
Thanks

It may happen for many reasons like you have ad blocker in your browser,slow internet connection or heavy load on your PC or browser etc.
If you have ad blocker then please remove it first, and delete history of your browser. and again reload the page.
P.S. : I am able to see full article on my laptop, I have checked in both chrome and mozilla.

I have run my code successfully by your method !!

Cannot solve symbol DATA_MATRIX
Help me

hi buddy, I did all project work but app doesnt create anyfile which name is QRcodeDemonuts,app generate qrcode but not save in any file pls help me? thanks

Same problem here java.io.IOException: No such file or directory

Is there any way of reading a document (pdf, doc) and then converting the resource into a QR code?

I will try to makes separate tutorial for this.

my app is crashing .i did everything alike in the tutorial but still.

How to insert multiple inputs in qr code?

I would like to know how to insert multiple inputs inside qr code like
Name
Add
Email id

You have to create single string which includes all details . For eg. hardik+hello@gmail.com+123

Hi Mr. Hardik, I’m a beginner in android studio app develop, I want to generate QR code and store it in mysql database using volley library, how I can achieve it.
Help please.

You will be able to generate QR code in image format with this tutorial itself. Now you can send this image to server and mysql using below tutorial : https://demonuts.com/android-upload-image-using-volley/

Hi this code works but It will not save the
Bitmap,java.io.IOException: No such file or directory

After some editing it finally saved my QR code, but how to add some text above the qrcode so we know the value of the qrcode on the image.

You may try this : take one linear layout. In that, take text view and set value of QR code in text view. Take image view in the same linear layout and preview QR code in it. Now take screen shot of this linear layout.

When I scan QR code it should generate URL in android studio ? Can anyone please help me out to solve this problem

Thank you. This was an enormous help to a significant activity in my project, wallet address qr code generation. I had to update the getExternalStorageDirectory method to (getApplicationContext().getExternalFilesDir(null).getAbsolutePath() + IMAGE_DIRECTORY) for the save method to work due to deprecation.

But besides that, it works wonderfully. Thank you. I just need to implement scanning/reading-in QR codes now in another activity and that is the core of my functionality sorted.

Any suggestions on source code for scanning QRs using Zxing and/or how I might upload QRs from the internal storage to read them in?

Creating a verification activity that involves scanning in or uploading a QR, which is then unencrypted into a string(crypto-wallet address) that I can use to query a database.

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Creating a Barcode Scanner using Android Studio

Step by step guide to building a barcode scanning application using Android Studio.

What is this article about

This article will guide you through creating an android application using which you can make use of your mobile camera to scan a barcode and read the data in them.

Prerequisite

1. The latest version of Android Studio installed. ( download from here )
2. A mobile device to test the application. (you can make use of the inbuild android emulator but in some pc, it may cause some issues.)
3. Knowledge of java or any object-oriented programing language.

Let’s write some code

1. Create a new application in android studio and name it Barcode Scanner.
2. Open up your app-level Gradle file and add the below dependency there.

3. Now hit on Sync now button and wait for the build to complete. Once the build is complete open up your manifest file and add the necessary permissions.

also, add the metadata field in your manifest file, inside the application tag and above the activity tag.

here’s a full view of my manifest file

4. Now you have set up all the dependency needed for the barcode scanner to work and all the permission necessary. Let’s build the UI for the app.

5. Open your activity_main.xml file and write the below code inside.

Now your view should look something like this

here we have something called a sufaceview in android and a textview field to display the text scanned by the barcode.

SurfaceView: It provides a dedicated drawing surface embedded inside the view hierarchy.

You have completed the UI code for the Barcode App, now let’s write the java code to make wonders happen.

6. Open MainActivity.java file and you will see the following code.

let’s add some code of our own

7. First, we need to bind the views.

8. Now we will write the method to scan the image for a barcode.

this method will help us scan and display the text in the textview we created in the XML file.

9. The complete java code will look something like this.

Now try scanning this barcode and you will see the value that is embedded in the barcode in the textview.

The final screen should something like this.

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