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Scanner.js
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Scanner.js
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import React, { useState, useEffect } from 'react';
import { Text, View, StyleSheet, Button } from 'react-native';
import { BarCodeScanner } from 'expo-barcode-scanner';
export default function Scanner( {navigation} ) {
const [hasPermission, setHasPermission] = useState(null);
const [scanned, setScanned] = useState(false);
useEffect(() => {
(async () => {
const { status } = await BarCodeScanner.requestPermissionsAsync();
setHasPermission(status === 'granted');
})();
}, []);
const handleBarCodeScanned = ({ type, data }) => {
setScanned(true);
alert(`Bar code with type ${type} and data ${data} has been scanned!`);
str = 'https://api.nal.usdCCa.gov/fdc/v1/foods/search?api_key=DEMO_KEY&query=' + id;
console.log(str);
const calories = fda_api;
const TextInANest = () => {
const [titleText, setTitleText] = useState("Calories:");
const bodyText = calories;
return (
<Text style={styles.baseText}>
<Text style={styles.titleText} onPress={onPressTitle}>
{titleText}
{"\n"}
{"\n"}
</Text>
<Text numberOfLines={5}>{bodyText}</Text>
</Text>
);
};
if (hasPermission === null) {
return <Text>Requesting for camera permission</Text>;
}
if (hasPermission === false) {
return <Text>No access to camera</Text>;
}
return (
<View style={styles.container}>
<BarCodeScanner
onBarCodeScanned={scanned ? undefined : handleBarCodeScanned}
style={StyleSheet.absoluteFillObject}
/>
{scanned && <Button title={'Tap to Scan Again'} onPress={() => setScanned(false)} />}
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: 'column',
justifyContent: 'center',
},
});