The method will be called inside the onCreate() method. To achieve this we will create the method “requestCamera()” to check that we have the consent from the user to use the camera and if we don’t to prompt them in the user interface. In addition to this due to the fact that Android considers the camera permission to be a dangerous permission, we will need to request the user’s consent to use the camera permission at run time through a prompt started from our activity.

See a sample app manifest below that requests the use of the camera permission with the “uses-permission” tag along with a request to use any camera available on the device with the “uses-feature” tag. To retrieve the ZXing dependency using gradle, add the following dependency to your app level adle file.īecause we will be using the camera in our Android app to scan for the QR code we will need to add the permission for the camera inside the app’s manifest file. ZXing can process images for scanning different sorts of codes such as UPCs, EAN codes as well as QR codes. ZXing, also known as Zebra Crossing, is an open-source free to use bar code scanning library for Java and Android. This can be down by adding a compileOptions section inside android block after the buildTypes section as per the sample adle file below. The CameraX library requires you to have Java 8 in your app, so you will need to include the Java 8 dependencies in your app level adle file. To retrieve the CameraX dependencies using gradle, add the following dependencies to your app level adle file. Video can’t be loaded because JavaScript is disabled: Android Jetpack: CameraX Beta () To learn more about what CameraX from the Android Jetpack library is all about check out this short video below from the Android Developers YouTube channel. In addition to this, we will use the image analysis capabilities from CameraX to retrieve the image frames retrieved from the device’s camera to process with a QR code scanning library. We will be using CameraX to show a live preview from the camera inside the app. CameraX reduces the complexity of having to factor in specifics of the device when designing an app that uses the camera. The CameraX Android Jetpack library, which is currently in beta at the time of writing (August 2020), is a support library that makes it easier to build Android apps that use the camera. Retrieve the Dependencies for CameraX and ZXing with Gradleįor the QR code scanner app we will be creating in Android will we require two dependencies CameraX from the Android Jetpack library and the ZXing library for bar code scanning. All of the code shared in this tutorial for the QR code scanner app for Android is available in GitHub for free at the link below. This tutorial for creating a QR code scanner Android app in Java will be broken down into five steps. Tutorial for Creating a QR Code Scanner Android App in Java In this tutorial for creating a QR code scanner app in Android using the CameraX and ZXing libraries I have documented each of these steps and have included code samples written in Java to help you along the way. Test It Out on the Emulator or on Your Device.Set up Image Analysis to Scan Frames From the Camera for QR Codes Using CameraX and ZXing.Set up a Live Preview of the Camera With CameraX.Retrieve the Dependencies for CameraX and ZXing with Gradle.To create a QR code scanner app in Android using CameraX and ZXing perform the following steps. As a part of the series of blog posts for creating apps from scratch, I have created a tutorial walking you through how to create a QR code scanner app for Android using the CameraX and ZXing libraries.

CameraX is a powerful Android Jetpack library that can drastically simplify the development effort for creating apps that use the camera.

Android qr code reader