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App.js
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App.js
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import React, { useState, useEffect } from 'react';
import { FlatList, Text, View, StyleSheet, ActivityIndicator } from 'react-native';
const generateData = (start, end) => {
const data = [];
for (let i = start; i <= end; i++) {
data.push({ id: i.toString(), value: `Item ${i}` });
}
return data;
};
const App = () => {
const [data, setData] = useState([]);
const [page, setPage] = useState(1);
const [loading, setLoading] = useState(false);
const pageSize = 10000000; // Number of items to load per page
useEffect(() => {
loadMoreData();
}, [page]);
const loadMoreData = () => {
if (loading) return;
setLoading(true);
const newData = generateData((page - 1) * pageSize + 1, page * pageSize);
setData(prevData => [...prevData, ...newData]);
setLoading(false);
};
const renderItem = ({ item }) => (
<View style={styles.item}>
<Text>{item.value}</Text>
</View>
);
const handleEndReached = () => {
setPage(prevPage => prevPage + 1);
};
return (
<View style={styles.container}>
<FlatList
data={data}
renderItem={renderItem}
keyExtractor={item => item.id}
onEndReached={handleEndReached}
onEndReachedThreshold={0.5}
ListFooterComponent={loading && <ActivityIndicator size="large" color="#0000ff" />}
/>
</View>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop: 20,
},
item: {
padding: 20,
borderBottomWidth: 1,
borderBottomColor: '#ccc',
},
});
export default App;