This is an Example of React Native Scan QR Code. To make a 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.
If you are making an app which needs to share small code/data/URL between users in physical presence then the 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 the QR Code Scanner Using React Native Camera.
In this example, we will make a home screen with a button to open A QR code scanner. On click of a button, we will open a Camera with QR Scan functionality and after scanning of the QR code, we will take the code back to the home screen. If the Scanned string is a link/URL then we will show an additional button to open the URL in default browser using React Native Linking Component. So let’s get started.
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 runnpm install -g react-native-clireact-native init ProjectNameInstallation 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 dependency in your package.json file.
Linking of Dependency
After installing the dependencies you need to link it with your project using
1 | react-native link |
After linking the dependency if you face Could not Compile Settings File project/android/settings.gradle error while building and installing the project then you can find the solution here.
Dependency Version for this Example Used is
1 | "react-native-camera-kit": "^6.2.4" |
Permission to use the Camera for Android
We are using a Native API Camera to scan the QR code so we need to add permission to the AndroidManifest.xml file to access it. So we are going to add the following permissions in the AndroidMnifest.xml
1 | <uses-permission android:name="android.permission.CAMERA"/> |
| Permission | Purpose |
|---|---|
| CAMERA | To access the camera |
On devices before SDK version 23, the permissions are automatically granted if they appear in the manifest but after SDK version 23 we have to ask run time permission also, so we will ask for permission in code also. For more about the permission, you can see this post.
Permission to use the Camera for IOS
1. Open the project CameraExample>ios>CameraExample.xcodeproj in XCode. Click on Project (CameraExample in my case) from the left sidebar and you will see multiple options in the workspace.
2. Select info tab which is info.plist
3. Click on the plus button to add a permission key “Privacy-Camera Usage Description” and a value which will be visible when permission dialog pops up.
Code to Make a QR Code Scanner
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | //This is an example code to Scan QR code// import React, { Component } from 'react'; //import react in our code. import { Text, View, Linking, TouchableHighlight, PermissionsAndroid, Platform, StyleSheet} 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: '', opneScanner: false, }; } 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 }); this.setState({ opneScanner: false }); } onOpneScanner() { var that =this; //To Start Scanning if(Platform.OS === 'android'){ async function requestCameraPermission() { try { const granted = await PermissionsAndroid.request( PermissionsAndroid.PERMISSIONS.CAMERA,{ 'title': 'CameraExample App Camera Permission', 'message': 'CameraExample App needs access to your camera ' } ) if (granted === PermissionsAndroid.RESULTS.GRANTED) { //If CAMERA Permission is granted that.setState({ qrvalue: '' }); that.setState({ opneScanner: true }); } else { alert("CAMERA permission denied"); } } catch (err) { alert("Camera permission err",err); console.warn(err); } } //Calling the camera permission function requestCameraPermission(); }else{ that.setState({ qrvalue: '' }); that.setState({ opneScanner: true }); } } render() { let displayModal; //If qrvalue is set then return this view if (!this.state.opneScanner) { return ( <View style={styles.container}> <Text style={styles.heading}>React Native QR Code Example</Text> <Text style={styles.simpleText}>{this.state.qrvalue ? 'Scanned QR Code: '+this.state.qrvalue : ''}</Text> {this.state.qrvalue.includes("http") ? <TouchableHighlight onPress={() => this.onOpenlink()} style={styles.button}> <Text style={{ color: '#FFFFFF', fontSize: 12 }}>Open Link</Text> </TouchableHighlight> : null } <TouchableHighlight onPress={() => this.onOpneScanner()} style={styles.button}> <Text style={{ color: '#FFFFFF', fontSize: 12 }}> Open QR Scanner </Text> </TouchableHighlight> </View> ); } return ( <View style={{ flex: 1 }}> <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> ); } } const styles = StyleSheet.create({ container: { flex: 1, alignItems: 'center', justifyContent: 'center', backgroundColor:'white' }, button: { alignItems: 'center', backgroundColor: '#2c3539', padding: 10, width:300, marginTop:16 }, heading: { color: 'black', fontSize: 24, alignSelf: 'center', padding: 10, marginTop: 30 }, simpleText: { color: 'black', fontSize: 20, alignSelf: 'center', padding: 10, marginTop: 16 } }); |
We have used this website to generate the QR Code.
To Run the React Native App
Open the terminal again and jump into your project using.cd ProjectNamereact-native run-androidreact-native run-ios (macOS only).Android
IOS
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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Great tutorial, can confirm it works. Just have one problem when flipping the camera side ways it gets distorted. Is there a fix for this? Cheers
Can you please share the screen shot on snehalagrawal1701@gmail.com for better understanding.
Hi, I am trying to follow this example but it shows me an error: Invariant Violation: requireNativeComponent: “CameraView” was not found in the UIManager.
I do not know what does it mean. I’m using Expo on Android device.
Thank you!
Hi Jaouadi Soufien,
Sorry, but it will not work in Expo environment. you have to eject from the Expo environment for this example.