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App.js
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App.js
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import React, {Component} from 'react';
import {Button, StyleSheet, Text, View, PermissionsAndroid, Alert, Dimensions} from 'react-native';
import {RNCamera} from 'react-native-camera';
export default class App extends Component {
state = {
hasCameraPermission: null,
scanned: false,
};
componentWillMount(): void {
this.requestCameraPermission();
}
async requestCameraPermission() {
try {
const status = await PermissionsAndroid.request(
PermissionsAndroid.PERMISSIONS.CAMERA,
{
title: 'Cool Photo App Camera Permission',
message:
'Cool Photo App needs access to your camera ' +
'so you can take awesome pictures.',
buttonNeutral: 'Ask Me Later',
buttonNegative: 'Cancel',
buttonPositive: 'OK',
},
);
this.setState({hasCameraPermission: status === 'granted'});
} catch (err) {
console.warn(err);
}
}
render() {
const {hasCameraPermission, scanned} = this.state;
if (hasCameraPermission === null) {
return <Text>Requesting for camera permission</Text>;
}
if (hasCameraPermission === false) {
return <Text>No access to camera</Text>;
}
const {height, width} = Dimensions.get('window');
const maskRowHeight = Math.round((height - 300) / 20);
const maskColWidth = (width - 300) / 2;
return (
<View
style={{
flex: 1,
justifyContent: 'flex-end',
}}>
<RNCamera
onBarCodeRead={scanned ? undefined : this.handleBarCodeScanned}
ref={ref => {
this.camera = ref;
}}
style={{
flex: 1,
justifyContent: 'flex-end',
alignItems: 'center',
}}
>
<View style={styles.maskOuter}>
<View style={[{flex: maskRowHeight}, styles.maskRow, styles.maskFrame]}/>
<View style={[{flex: 30}, styles.maskCenter]}>
<View style={[{width: maskColWidth}, styles.maskFrame]}/>
<View style={styles.maskInner}/>
<View style={[{width: maskColWidth}, styles.maskFrame]}/>
</View>
<View style={[{flex: maskRowHeight}, styles.maskRow, styles.maskFrame]}/>
</View>
</RNCamera>
{scanned && (
<Button
title={'Scan Again'}
onPress={() => this.setState({scanned: false})}
/>
)}
</View>
);
}
handleBarCodeScanned = async ({type, data}) => {
if (!this.state.scanned) {
this.setState({scanned: true});
await Alert.alert(
'Barcode Type & Data',
'Type: ' + type.toString() + ' Data: ' + data.toString(),
[
{text: 'Ok', onPress: () => null}
]
);
}
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
cameraView: {
flex: 1,
justifyContent: 'flex-start',
},
maskOuter: {
position: 'absolute',
top: 0,
left: 0,
width: '100%',
height: '100%',
alignItems: 'center',
justifyContent: 'space-around',
},
maskInner: {
width: 300,
backgroundColor: 'transparent',
borderColor: 'white',
borderWidth: 1,
},
maskFrame: {
backgroundColor: 'rgba(1,1,1,0.6)',
},
maskRow: {
width: '100%',
},
maskCenter: {flexDirection: 'row'},
});