Generating qr code android

Wifi QR Code Generator

An android app that generates QR codes from your saved wifi networks.

The app needs root access to read your saved wifi information.
Tap a wifi entry to display its QR code.
Hold a wifi entry to display more details.

What I’m working on next (from highest to lowest significance)

Bug fixes (always at the top of the list)
Sort networks alphabetically Done.
An xposed component that adds an option in the stock wifi settings to display the QR code/password Done.
Backport to older android versions Done.
An about page Done.
Setting to choose the quality of the QR code generated Done.
A dark theme Done.
Make new bugs

I need feedback to see if these are only happening to some people or if they’re happening to everyone.

The list of network may disapear when returning from the settings screen.
WEP networks may cause an error. Fixed.

Parsing and data management code by David-Mawer has been used, adapted, and converted to Kotlin.
QRGen: A simple QRCode generation api for java built on top ZXING
RecyclerView-FastScroll: A simple FastScroller for Android’s RecyclerView
About Page — Android: An Android library for easily creating an about page for your Android apps

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by (at your option) any later version.

This program is distributed in the hope that it will be useful, MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

About

An android app that generates QR codes from your saved wifi networks.

Источник

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.

Источник

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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