React Native Camera

React Native Camera Kit

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 command line interface to make our React Native App.

If you have previously installed a global react-native-cli package, please remove it as it may cause unexpected issues:

npm uninstall -g react-native-cli @react-native-community/cli

Run the following commands to create a new React Native project

npx react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

npx react-native init ProjectName --version X.XX.X

Note If the above command is failing, you may have old version of react-native or react-native-cli installed globally on your pc. Try uninstalling the cli and run the cli using npx.

This 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

cd ProjectName

Run the following command

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

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.

<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

// React Native Camera
// https://aboutreact.com/react-native-camera/

// import React in our code
import React, {useState} from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  StyleSheet,
  Text,
  View,
  PermissionsAndroid,
  Alert,
  Platform,
  TouchableHighlight,
} from 'react-native';

// import CameraKitCameraScreen
import {CameraKitCameraScreen} from 'react-native-camera-kit';

const App = () => {
  const [isPermitted, setIsPermitted] = useState(false);
  const [captureImages, setCaptureImages] = useState([]);

  const requestCameraPermission = async () => {
    try {
      const granted = await PermissionsAndroid.request(
        PermissionsAndroid.PERMISSIONS.CAMERA,
        {
          title: 'Camera Permission',
          message: 'App needs camera permission',
        },
      );
      // If CAMERA Permission is granted
      return granted === PermissionsAndroid.RESULTS.GRANTED;
    } catch (err) {
      console.warn(err);
      return false;
    }
  };

  const requestExternalWritePermission = async () => {
    try {
      const granted = await PermissionsAndroid.request(
        PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
        {
          title: 'External Storage Write Permission',
          message: 'App needs write permission',
        },
      );
      // If WRITE_EXTERNAL_STORAGE Permission is granted
      return granted === PermissionsAndroid.RESULTS.GRANTED;
    } catch (err) {
      console.warn(err);
      alert('Write permission err', err);
    }
    return false;
  };

  const requestExternalReadPermission = async () => {
    try {
      const granted = await PermissionsAndroid.request(
        PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE,
        {
          title: 'Read Storage Permission',
          message: 'App needs Read Storage Permission',
        },
      );
      // If READ_EXTERNAL_STORAGE Permission is granted
      return granted === PermissionsAndroid.RESULTS.GRANTED;
    } catch (err) {
      console.warn(err);
      alert('Read permission err', err);
    }
    return false;
  };

  const openCamera = async () => {
    if (Platform.OS === 'android') {
      if (await requestCameraPermission()) {
        if (await requestExternalWritePermission()) {
          if (await requestExternalReadPermission()) {
            setIsPermitted(true);
          } else alert('READ_EXTERNAL_STORAGE permission denied');
        } else alert('WRITE_EXTERNAL_STORAGE permission denied');
      } else alert('CAMERA permission denied');
    } else {
      setIsPermitted(true);
    }
  };

  const onBottomButtonPressed = (event) => {
    const images = JSON.stringify(event.captureImages);
    if (event.type === 'left') {
      setIsPermitted(false);
    } else if (event.type === 'right') {
      setIsPermitted(false);
      setCaptureImages(images);
    } else {
      Alert.alert(
        event.type,
        images,
        [{text: 'OK', onPress: () => console.log('OK Pressed')}],
        {cancelable: false},
      );
    }
  };

  return (
    <SafeAreaView style={{flex: 1}}>
      {isPermitted ? (
        <View style={{flex: 1}}>
          <CameraKitCameraScreen
            // Buttons to perform action done and cancel
            actions={{
              rightButtonText: 'Done',
              leftButtonText: 'Cancel'
            }}
            onBottomButtonPressed={
              (event) => 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')}
          />
        </View>
      ) : (
        <View style={styles.container}>
          <Text style={styles.titleText}>React Native Camera</Text>
          <Text style={styles.textStyle}>{captureImages}</Text>
          <TouchableHighlight
            onPress={openCamera}
            style={styles.buttonStyle}
          >
            <Text style={styles.buttonTextStyle}>Open Camera</Text>
          </TouchableHighlight>
        </View>
      )}
    </SafeAreaView>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'white',
    padding: 10,
    alignItems: 'center',
  },
  titleText: {
    fontSize: 22,
    textAlign: 'center',
    fontWeight: 'bold',
  },
  textStyle: {
    color: 'black',
    fontSize: 16,
    textAlign: 'center',
    padding: 10,
    marginTop: 16,
  },
  buttonStyle: {
    fontSize: 16,
    color: 'white',
    backgroundColor: 'green',
    padding: 5,
    marginTop: 32,
    minWidth: 250,
  },
  buttonTextStyle: {
    padding: 5,
    color: 'white',
    textAlign: 'center',
  },
});

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 ProjectName

1. Start Metro Bundler

First, you will need to start Metro, the JavaScript bundler that ships with React Native. To start Metro bundler run following command

npx react-native start

Once you start Metro Bundler it will run forever on your terminal until you close it. Let Metro Bundler run in its own terminal. Open a new terminal and run the application.

2. Start React Native Application

To run the project on an Android Virtual Device or on real debugging device

npx react-native run-android

or on the iOS Simulator by running (macOS only)

npx react-native run-ios

Download Source Code

Output Screenshots

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. 🙂