App.js

import React from 'react';
import {Alert} from "react-native";
import Loading from "./Loading";
import * as Location from 'expo-location';

export default class extends React.Component {
  state = {
    isLoading: true
  };

  getLocation = async() => {
    try {
      await Location.requestPermissionsAsync();
      const { 
        coords: { latitude, longitude }
      } = await Location.getCurrentPositionAsync();
      // console.log(coords.latitude, coords.longitude); 
      this.setState({ isLoading: false });
      // Send to API and get microdust
    } catch (error) {
      Alert.alert("Can't find you.", "Try Again.")
    }
  };

  componentDidMount(){ 
    this.getLocation();
  };

  render() {
    const { isLoading } = this.state;
    return isLoading ? <Loading /> : null;
  };
}