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React Native之相机扫码

效果展示

配置

react-native link react-native-camera
// 配置andriod/app/src/build.gradle 

defaultConfig {
applicationId "com.jtyapps"
minSdkVersion rootProject.ext.minSdkVersion
targetSdkVersion rootProject.ext.targetSdkVersion
versionCode 1
versionName "1.0"
ndk {
abiFilters "armeabi-v7a", "x86"
}
// 添加这里
missingDimensionStrategy 'react-native-camera', 'general'
}

// 配置andriod/gradle/wrapper/gradle-wrapper.properties
// 本教程使用的是这个版本
distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip

添加相机权限

andriod/app/src/main/AndroidManifest.xml

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGEE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-feature android:name="android.hardware.camera" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front" android:required="false"/>

处理逻辑

// scan.js
import React, { Component } from 'react';

import {
View,
Text,
StyleSheet,
Image,
Platform,
Vibration,
TouchableOpacity,
Animated,
Easing,
Dimensions,
StatusBar
} from 'react-native';
import Icon from 'react-native-vector-icons/Feather';
const { width, height } = Dimensions.get('window');
import { Modal } from '@ant-design/react-native';

import {RNCamera} from 'react-native-camera';
import ViewFinder from './ViewFinder';

import scanLine from '../../assets/images/scan_line.png';
import { scaleSizeW, scaleSizeH, setSpText } from '../../utils/scale';

export default class MyScan extends Component {
static navigationOptions = ({ navigation, navigationOptions }) => {
return({
header: null
})
};
constructor(props) {
super(props);
this.camera = null;
this.state = {
openFlash: false,
active: true,
flag: true,
fadeInOpacity: new Animated.Value(0), // 初始值
isEndAnimation: false,//结束动画标记
key: ''
}

}
componentDidMount() {
const {navigation} = this.props;

this._startAnimation(false);
}
componentWillReceiveProps(nProps) {
const {key } = this.state;
const {navigation} = nProps;

let newKey = navigation.getParam('key');

if(key!=newKey){
this.transCode = '';
this.setState({
key: newKey
})
}
console.log('scan进来了')
}

//开始动画,循环播放
_startAnimation = (isEnd) => {
Animated.timing(this.state.fadeInOpacity, {
toValue: 1,
duration: 3000,
easing: Easing.linear
}).start(
() => {
if (isEnd) {
this.setState({
isEndAnimation: true
})
return;
}
if (!this.state.isEndAnimation) {
this.state.fadeInOpacity.setValue(0);
this._startAnimation(false)
}
}
);
// console.log("开始动画");
}
barcodeReceived (e){
const {navigation:{navigate}} = this.props;
if (e.data !== this.transCode) {
Vibration.vibrate([0, 500, 200, 500]);
this.transCode = e.data; // 放在this上,防止触发多次,setstate有延时
if (this.state.flag) {
this.changeState(false);
}
console.log("transCode=" + this.transCode);
Modal.alert('温馨提示', `确定绑定: ${this.transCode} 吗?`, [
{
text: '取消',
onPress: () => console.log('cancel'),
style: 'cancel',
},
{ text: '确定', onPress: () => {
navigate('Record')
// dispatch({
// type: 'user/bindHeartDev',
// callback: res=>{
// if(res.code == 200) {
// navigate('Record')
// }
// }
// })
} },
]);
}
}
//返回按钮点击事件
_goBack = () => {
this.setState({
isEndAnimation: true,
});
this.props.navigation.goBack();
}
//开灯关灯
_changeFlash = () => {
this.setState({
openFlash: !this.state.openFlash,
});
}
//改变请求状态
changeState = (status) => {
this.setState({
flag: status
});
console.log('status=' + status);
}

render() {
const {
openFlash,
active,
} = this.state;
return (
<View style={styles.allContainer}>
<RNCamera
barCodeTypes={[RNCamera.Constants.BarCodeType.qr]}
onBarCodeRead={this.barcodeReceived.bind(this)}
onCameraReady={() => {
console.log('ready')
}}
permissionDialogTitle={'Permission to use camera'}
permissionDialogMessage={'We need your permission to use your camera phone'}
// defaultVideoQuality={RNCamera.Constants.VideoQuality["480p"]}
style={styles.cameraStyle}
>
<View style={styles.container}>
<View style={styles.titleContainer}>
<View style={styles.leftContainer}>
<TouchableOpacity activeOpacity={1} onPress={this._goBack}>
<View>
{/* <Image style={styles.backImg} source={backIcon} /> */}
<Icon name="chevron-left" style={styles.backIcon}/>
</View>
</TouchableOpacity>
</View>
</View>
</View>
<View style={styles.centerContainer} />
<View style={{ flexDirection: 'row' }}>
<View style={styles.fillView} />
<View style={styles.scan}>
<ViewFinder />
<Animated.View style={[styles.scanLine, {
opacity: 1,
transform: [{
translateY: this.state.fadeInOpacity.interpolate({
inputRange: [0, 1],
outputRange: [0, scaleSizeH(300)]
})
}]
}]}>
<Image source={scanLine} />
</Animated.View>
</View>
<View style={styles.fillView} />
</View>
<View style={styles.bottomContainer}>
<Text
style={[
styles.text,
{
textAlign: 'center',
width: 220,
marginTop: active ? 25 : 245,
},
]}
numberOfLines={2}
>
请将手表二维码放入扫码框内
</Text>
{/** <TouchableOpacity onPress={this._changeFlash}>
<View style={styles.flash}>
<Text style={styles.icon}>(・◇・)</Text>
<Text style={styles.text}>
开灯/关灯
</Text>
</View>
</TouchableOpacity> */}

</View>
</RNCamera>
</View>
)
}
}

const styles = StyleSheet.create({
allContainer: {
flex: 1,
},
container: {
...Platform.select({
ios: {
height: 64 + StatusBar.currentHeight,
},
android: {
height: 50 + StatusBar.currentHeight,
}
}),
backgroundColor: '#000',
opacity: 0.5
},
titleContainer: {
flex: 1,
...Platform.select({
ios: {
paddingTop: 15,
},
android: {
paddingTop: 0,
}
}),
flexDirection: 'row',
},
leftContainer: {
flex: 0,
justifyContent: 'center',
},
backIcon: {
marginLeft: 10,
fontSize: 30,
color: '#fff'
},
cameraStyle: {
alignSelf: 'center',
width: width,
height: height,
},
flash: {
flexDirection: 'column',
alignItems: 'center',
justifyContent: 'flex-start',
marginTop: 60,
},
flashIcon: {
fontSize: 1,
color: '#fff',
},
text: {
fontSize: 14,
color: '#fff',
marginTop: 5
},
icon: {
color: '#fff',
fontSize: 20,
fontFamily: 'iconfont'
},
scanLine: {
alignSelf: 'center',
},
centerContainer: {
...Platform.select({
ios: {
height: 80,
},
android: {
height: 60,
}
}),
width: width,
backgroundColor: '#000',
opacity: 0.5
},
bottomContainer: {
alignItems: 'center',
backgroundColor: '#000',
alignSelf: 'center',
opacity: 0.5,
flex: 1,
width: width
},
fillView: {
width: (width - scaleSizeH(300)) / 2,
height: scaleSizeH(300),
backgroundColor: '#000',
opacity: 0.5
},
scan: {
width: scaleSizeH(300),
height: scaleSizeH(300),
alignSelf: 'center'
},
info:{
color: '#fff'
}

})
// ViewFinder.js
import React, {
Component,
} from 'react';
import {
ActivityIndicator,
StyleSheet,
View,
} from 'react-native';
import { scaleSizeW, scaleSizeH, setSpText } from '../../utils/scale';


export default class Viewfinder extends Component {
constructor(props) {
super(props);

}

getBackgroundColor = () => {
return ({
backgroundColor: this.props.backgroundColor,
});
}

getEdgeColor = () => {
return ({
borderColor: this.props.color,
});
}

getSizeStyles = () => {
return ({
height: this.props.height,
width: this.props.width,
});
}

getEdgeSizeStyles = () => {
return ({
height: this.props.borderLength,
width: this.props.borderLength,
});
}

renderLoadingIndicator = () => {
if (!this.props.isLoading) {
return null;
}

return (
<ActivityIndicator
animating={this.props.isLoading}
color={this.props.color}
size="large"
/>
);
}

render() {
return (
<View style={[styles.container, this.getBackgroundColor()]}>
<View style={[styles.viewfinder, this.getSizeStyles()]}>
<View
style={[
this.getEdgeColor(),
this.getEdgeSizeStyles(),
styles.topLeftEdge,
{
borderLeftWidth: this.props.borderWidth,
borderTopWidth: this.props.borderWidth,
},
]}
/>
<View
style={[
this.getEdgeColor(),
this.getEdgeSizeStyles(),
styles.topRightEdge,
{
borderRightWidth: this.props.borderWidth,
borderTopWidth: this.props.borderWidth,
},
]}
/>
{this.renderLoadingIndicator()}
<View
style={[
this.getEdgeColor(),
this.getEdgeSizeStyles(),
styles.bottomLeftEdge,
{
borderLeftWidth: this.props.borderWidth,
borderBottomWidth: this.props.borderWidth,
},
]}
/>
<View
style={[
this.getEdgeColor(),
this.getEdgeSizeStyles(),
styles.bottomRightEdge,
{
borderRightWidth: this.props.borderWidth,
borderBottomWidth: this.props.borderWidth,
},
]}
/>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
alignItems: 'center',
justifyContent: 'center',
position: 'absolute',
top: 0,
right: 0,
bottom: 0,
left: 0,
},
viewfinder: {
alignItems: 'center',
justifyContent: 'center',
backgroundColor: 'transparent',
},
topLeftEdge: {
position: 'absolute',
top: 0,
left: 0,
},
topRightEdge: {
position: 'absolute',
top: 0,
right: 0,
},
bottomLeftEdge: {
position: 'absolute',
bottom: 0,
left: 0,
},
bottomRightEdge: {
position: 'absolute',
bottom: 0,
right: 0,
},
});


Viewfinder.defaultProps = {
backgroundColor: 'transparent',
borderWidth: 3,
borderLength: 20,
color: '#1DBAF1',
height: scaleSizeH(300),
isLoading: false,
width: scaleSizeH(300),
};
// 使用方式
onScan = ()=>{
const { navigate } = this.props.navigation;
// 跳转到扫码页面即可打开
navigate('Scan')
}
`
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