If you are making an app which needs to share small code/data/URL between users in physical presence then QR Code is the cool thing to integrate into your App. For this process, we have to implement a QR Code Scanner and QR Code Generators in our app. In this example, you will make QR Code Scanner Using React Native.
To make QR Code Scanner in our React Native Wix has provided a very good library named react-native-camera-kit. Which is very easy to integrate into your app. So let’s get started.
As we want to use the native Camera API we need to do some additional changes in different files to access the camera in android.
To Make a React Native App
Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install thereact-native-cli command line utility. Open the terminal and go to the workspace and runInstallation of Dependency
To use <CameraKitCameraScreen /> we need to install react-native-camera-kit package. To install this
Open the terminal and jump into your project
1 | cd ProjectName |
Run the following command
1 | npm install react-native-camera-kit --save |
This command will copy all the dependencies into your node_module directory, You can find the directory in node_module the directory named react-native-camera-kit.
–save is optional, it is just to update the react-native-camera-kit dependancy in your package.json file.
Dependency Version for this Example Used is
1 | "react-native-camera-kit": "^6.2.4" |
Permission to Use the Camera and Other Configurations
We are using an Android Native API Camera so we need to add some permission to the AndroidManifest.xml file. On devices before SDK version 23, the permissions are automatically granted if they appear in the manifest but after SDK version 23 android applies new permissions model. For more about the permission, you can see this post.
So we are going to add the following permissions in the AndroidMnifest.xml
1 | <uses-permissionandroid:name="android.permission.CAMERA"/> |
CAMERA: To access the camera
By adding permission in AndroidManifest.xml you are able to work with the CAMERA in devices which are lower than API 23. But if you want to access the CAMERA in higher level devices you also need to ask for the runtime permission.
For this example, we also need to add some additional libraries and lines to do a suitable configuration. Please do check your compileSdkVersion and targetSdkVersion is above or equal 23. Go to the QRCodeScannerExample > android > app > build.gradle.
For the example, I am using this configuration. With the extra line multiDexEnabled true which is to solve the problem of multidex faced many times.
1 2 3 4 5 6 7 8 9 10 11 12 | compileSdkVersion 26 defaultConfig { applicationId "com.qrcodescannerexample" minSdkVersion 16 targetSdkVersion 26 versionCode 1 versionName "1.0" ndk { abiFilters "armeabi-v7a", "x86" } multiDexEnabled true } |
After that scroll down and add the following dependencies.
1 2 | compile project(":rncamerakit") compile 'com.android.support:multidex:1.0.3' |
Open QRCodeScannerExample > android > settings.gradle and add the following lines
1 2 | include ':rncamerakit' project(':rncamerakit').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-camera-kit/android/') |
Open QRCodeScannerExample > android > app > src > main > java > com > qrcodescannerexample > MainApplication.java and add following lines in imports
1 | import com.wix.RNCameraKit.RNCameraKitPackage; |
and in getPackages after new MainReactPackage() add a comma(,) and add
1 | new RNCameraKitPackage() |
Open App.js in any code editor and replace the code with the following code.
App.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | //This is an example code to Scan QR code// import React, { Component } from 'react'; //import react in our code. import { Text, View, StatusBar, Dimensions, Vibration, Linking, TouchableHighlight, Alert, } from 'react-native'; // import all basic components import { CameraKitCameraScreen, } from 'react-native-camera-kit'; //import CameraKitCameraScreen we are going to use. export default class App extends Component { constructor() { super(); this.state = { //variable to hold the qr value qrvalue: '', }; } onOpenlink() { //Function to open URL, If scanned Linking.openURL(this.state.qrvalue); //Linking used to open the URL in any browser that you have installed } onBarcodeScan(qrvalue) { //called after te successful scanning of QRCode/Barcode this.setState({ qrvalue: qrvalue }); } onContinueScan() { //To continue Scanning this.setState({ qrvalue: '' }); } componentDidMount() { //Setting up Status Bar StatusBar.setBarStyle('light-content'); } render() { let displayModal; //If qrvalue is set then return this view if (this.state.qrvalue) { displayModal = ( <View style={{ backgroundColor: 'rgba(00, 00, 00 , 0.8)', position: 'absolute', marginTop: 100, height: Dimensions.get('window').height - 100, width: Dimensions.get('window').width, }}> <View style={{ alignSelf: 'center', padding: 10, marginTop: 30 }}> <Text style={{ color: '#FFFFFF', fontSize: 24 }}>SCANNED</Text> </View> <View style={{ alignSelf: 'center' }}> <Text style={{ color: '#FFFFFF', fontSize: 18 }} onPress={() => this.onOpenlink()}> QR Code:{' '} <Text style={{ color: 'lightblue' }}>{this.state.qrvalue}</Text> </Text> </View> <TouchableHighlight onPress={() => this.onOpenlink()} style={{ marginTop: 180, alignSelf: 'center', padding: 10, backgroundColor: '#2C3539', }}> <View> <Text style={{ color: '#FFFFFF', fontSize: 12 }}>Open Link</Text> </View> </TouchableHighlight> <TouchableHighlight onPress={() => this.onContinueScan()} style={{ marginTop: 10, alignSelf: 'center', padding: 10, backgroundColor: '#2C3539', }}> <View> <Text style={{ color: '#FFFFFF', fontSize: 12 }}> Continue Scanning </Text> </View> </TouchableHighlight> </View> ); return displayModal; } //Initial/After Reset return this view return ( <View style={{ flex: 1 }}> <View style={{ height: 100, backgroundColor: '#000000', paddingTop: 20 }}> <Text style={{ color: '#FFFFFF', fontSize: 32, marginTop: 20, marginLeft: 20,}}> QRCodeScannerExample </Text> </View> <CameraKitCameraScreen showFrame={false} //Show/hide scan frame scanBarcode={true} //Can restrict for the QR Code only laserColor={'blue'} //Color can be of your choice frameColor={'yellow'} //If frame is visible then frame color colorForScannerFrame={'black'} //Scanner Frame color onReadCode={event => this.onBarcodeScan(event.nativeEvent.codeStringValue) } /> </View> ); } } |
To Run the React Native App
Open the terminal again and jump into your project using.
That was the React Native Scan QR Code. If you have any doubt or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!
Hope you liked it. 🙂
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