ActivityIndicator

import React from 'react';
import { ActivityIndicator, StyleSheet, View } from 'react-native';

const App = () => (
  <View style={[styles.container, styles.horizontal]}>
    <ActivityIndicator />
    <ActivityIndicator size="large" />
    <ActivityIndicator size="small" color="#0000ff" />
    <ActivityIndicator size="large" color="#00ff00" />
  </View>
);

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
  },
  horizontal: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    padding: 10,
  },
});

export default App;

import React, { useState, useEffect } from 'react';
import { ActivityIndicator, View, Text } from 'react-native';

const LoadingData = () => {
  const [loading, setLoading] = useState(true);
  const [data, setData] = useState(null);

  useEffect(() => {
    fetchData().then(result => {
      setData(result);
      setLoading(false);
    });
  }, []);

  if (loading) {
    return (
      <View style={{ flex: 1, justifyContent: 'center' }}>
        <ActivityIndicator size="large" color="#0000ff" />
      </View>
    );
  }

  return <Text>{data}</Text>;
};