We all usually need a camera in our app and Wix has provided a very good library named react-native-camera-kit. Which is very easy to integrate into your app.
In this example, we will make a home screen to open Camera and in the camera, we will have a capture button, a front to back camera switch button, a flash setting button, and a cancel button to close the camera. 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 the react-native-cli command line utility. Open the terminal and go to the workspace and run
npm install -g react-native-cliRun the following commands to create a new React Native project
react-native init ProjectNameIf you want to start a new project with a specific React Native version, you can use the --version argument:
react-native init ProjectName --version X.XX.Xreact-native init ProjectName --version react-native@nextThis will make a project structure with an index file named App.js in your project directory.
Installation 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.
Installation of Pod
React Native 0.60 brings the auto-linking feature which links the library automatically and you just need to install the pod file using the following command
1 | cd ios && pod install && cd .. |
Permission to use the Camera for Android
We are using a Native API Camera so we need to add some permission into the AndroidManifest.xml file.
Please add the following permissions in your AndroidMnifest.xml. Go to CameraExample -> android -> app -> main -> AndroidMnifest.xml.
1 2 3 | <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> |
| Permission | Purpose |
|---|---|
| CAMERA | To access the camera |
| WRITE_EXTERNAL_STORAGE | To store the content in the SD card |
| READ_EXTERNAL_STORAGE | To view the content of the SD card |
For more about the permission, you can see this post.
Permission to use the Camera for IOS
Please follow the below steps to add the permission in iOS project to use the camera.
Open the project CameraExample -> ios -> ScannerExample.xcworkspace in Xcode.
1. After opening the project in Xcode click on the project 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 Run Camera in React Native Application
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | //This is an example code for the camera// import React from 'react'; //import react in our code. import { StyleSheet, Text, View, Alert, ActivityIndicator, PermissionsAndroid, Platform, TouchableOpacity, } from 'react-native'; //import all the basic components we are going to use. import { CameraKitCameraScreen } from 'react-native-camera-kit'; //import CameraKitCameraScreen we are going to use. export default class App extends React.Component { state = { isPermitted: false }; constructor(props) { super(props); } onPress() { var that = this; 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 //Calling the WRITE_EXTERNAL_STORAGE permission function requestExternalWritePermission(); } else { alert('CAMERA permission denied'); } } catch (err) { alert('Camera permission err', err); console.warn(err); } } async function requestExternalWritePermission() { try { const granted = await PermissionsAndroid.request( PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE, { title: 'CameraExample App External Storage Write Permission', message: 'CameraExample App needs access to Storage data in your SD Card ', } ); if (granted === PermissionsAndroid.RESULTS.GRANTED) { //If WRITE_EXTERNAL_STORAGE Permission is granted //Calling the READ_EXTERNAL_STORAGE permission function requestExternalReadPermission(); } else { alert('WRITE_EXTERNAL_STORAGE permission denied'); } } catch (err) { alert('Write permission err', err); console.warn(err); } } async function requestExternalReadPermission() { try { const granted = await PermissionsAndroid.request( PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE, { title: 'CameraExample App Read Storage Read Permission', message: 'CameraExample App needs access to your SD Card ', } ); if (granted === PermissionsAndroid.RESULTS.GRANTED) { //If READ_EXTERNAL_STORAGE Permission is granted //changing the state to re-render and open the camera //in place of activity indicator that.setState({ isPermitted: true }); } else { alert('READ_EXTERNAL_STORAGE permission denied'); } } catch (err) { alert('Read permission err', err); console.warn(err); } } //Calling the camera permission function requestCameraPermission(); } else { this.setState({ isPermitted: true }); } } onBottomButtonPressed(event) { const captureImages = JSON.stringify(event.captureImages); if (event.type === 'left') { this.setState({ isPermitted: false }); } else { Alert.alert( event.type, captureImages, [{ text: 'OK', onPress: () => console.log('OK Pressed') }], { cancelable: false } ); } } render() { if (this.state.isPermitted) { return ( <CameraKitCameraScreen // Buttons to perform action done and cancel actions={{ rightButtonText: 'Done', leftButtonText: 'Cancel' }} onBottomButtonPressed={event => this.onBottomButtonPressed(event)} flashImages={{ // Flash button images on: require('./assets/flashon.png'), off: require('./assets/flashoff.png'), auto: require('./assets/flashauto.png'), }} cameraFlipImage={require('./assets/flip.png')} captureButtonImage={require('./assets/capture.png')} /> ); } else { return ( <View style={styles.container}> <TouchableOpacity style={styles.button} onPress={this.onPress.bind(this)}> <Text>Open Camera</Text> </TouchableOpacity> </View> ); } } } const styles = StyleSheet.create({ container: { flex: 1, alignItems: 'center', justifyContent: 'center', backgroundColor: 'white', }, button: { alignItems: 'center', backgroundColor: '#DDDDDD', padding: 10, width: 300, marginTop: 16, }, }); |
Before running the app you need to make a directory called “assets ” to keep the images that we have used. Download and put all the images in assets as shown
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 Camera. 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. 🙂
The code works fine on android but does not work properly on IOS. It seems the permission functions are only for android so the code keeps getting stuck in the try catch. Any ideas?
Hello,
I have tried it on IOS also but let me confirm if there is any update in it..
We will confirm you soon.
Mean while if you found the problem and solution for that please comment to help others..
in this package. in the galleryScreen. if i tap on image the image url is only appended to the state.
how can i append the full image object with all the attributes i.e filename, size, url etc
onTapImage(event) {
const uri = event.nativeEvent.selected;
if (this.state.images[uri]) {
delete this.state.images[uri];
} else {
this.state.images[uri] = true;
}
this.setState({ images: {…this.state.images }})
}
Hi! I am trying to do as you but there is one problem. nvariant Violation: Invariant Violation: requireNativeComponent: “CameraView” was not found in the UIManager. I do not know what does it mean(((
I use expo. Is it possible use this library with expo?
Thank you!
Actually, we are using a native feature of the device which needs to add some additional code in the native structure manually or with the “react-native link” but in case of expo it is not possible as it gives you a sandboxed environment to start working.
So sorry it is not possible on Expo.
i’ve been tried your tutorial about RN Camera, which the icon can small size, i don’t know the size u wear in assets folder.
and i want to ask you, how can i set the size in this code ?
im surely want to know how set the size.
thankyou before 🙂
Sorry but there is no way to set the size of the icon. You have to manually reduce the size of the icon. I have tried it on the request of 1 AboutReact family member like you but it wasn’t worked.
I have used 32px*32px icon in the example.
Followed your instructions to the letter – I get this error:
https://drive.google.com/open?id=1sMoxNTaASzOErYC5C9WmikJ2pZHLhqyX
I assumed that it might be the testing area that caused it, so I created a signed release build, and ran adb logcat – and found the exact same error, outputted.
How do I fix this, within your method?
Ok, I’ll check for it and will revert you as soon as possible.
Can you please check the updated example?
plz add expo way +
you’re explaining is very clear
But why do you need for the expo. At the end you have to build in this way.
Hi i am trying scan Barcode.
and read JAN code.
please teach how to read JAN code.
Can you please look at the below example. If you still facing the issue then please revert me on aboutreact11@gmail.com
https://aboutreact.com/react-native-scan-qr-code/