which rnpm || npm install -g rnpmrnpm link react-native-camerarnpm link react-native-barcodescanner

https://github.com/lwansbrough/react-native-camera#manual-installhttps://github.com/ideacreation/react-native-barcodescanner#installation

import com.eguma.barcodescanner.BarcodeScannerPackage;//导入

public class MainApplication extends Application implements ReactApplication {    // (...)    @Override    protected List<ReactPackage> getPackages() {      return Arrays.<ReactPackage>asList(        new MainReactPackage(),        new BarcodeScannerPackage() // add this statement      );    }}

import React, { Component } from ‘react‘;import {  AppRegistry,  StyleSheet,  Text,  View} from ‘react-native‘;import BarcodeScanner from ‘react-native-barcode-scanner-universal‘export default class qrcode extends Component {　//解析数据  parseData(pdata){      var ptype = pdata.type;      var data =http://www.mamicode.com/ pdata.data;      fetch(data)          .then((response) => response.json())          .then((responseJson) => {              console.log(responseJson);          })          .catch((error) => {              console.error(error);          });  }  render() {    let scanArea = null    scanArea = (        <View style={styles.rectangleContainer}>          <View style={styles.rectangle} />        </View>    )    return (      <BarcodeScanner        onBarCodeRead={  this.parseData.bind(this)  }        style={styles.camera}      >        {scanArea}      </BarcodeScanner>    );  }}const styles = StyleSheet.create({    camera: {    flex: 1  },    rectangleContainer: {    flex: 1,    alignItems: ‘center‘,    justifyContent: ‘center‘,    backgroundColor: ‘transparent‘  },    rectangle: {    height: 250,    width: 250,    borderWidth: 2,    borderColor: ‘#00FF00‘,    backgroundColor: ‘transparent‘  }});