content: import React from 'react';
  import {
    StyleSheet,
    View,
    Text,
    Dimensions,
    TouchableOpacity,
  } from 'react-native';
  
  import MapView from 'react-native-maps';
  import flagPinkImg from './assets/flag-pink.png';
  
  const { width, height } = Dimensions.get('window');
  
  const ASPECT_RATIO = width / height;
  const LATITUDE = 37.78825;
  const LONGITUDE = -122.4324;
  const LATITUDE_DELTA = 0.0922;
  const LONGITUDE_DELTA = LATITUDE_DELTA * ASPECT_RATIO;
  let id = 0;
  
  class CustomMarkers extends React.Component {
    constructor(props) {
      super(props);
  
      this.state = {
        region: {
          latitude: LATITUDE,
          longitude: LONGITUDE,
          latitudeDelta: LATITUDE_DELTA,
          longitudeDelta: LONGITUDE_DELTA,
        },
        markers: [],
      };
  
      this.onMapPress = this.onMapPress.bind(this);
    }
  
    onMapPress(e) {
      this.setState({
        markers: [
          ...this.state.markers,
          {
            coordinate: e.nativeEvent.coordinate,
            key: `foo${id++}`,
          },
        ],
      });
    }
  
    render() {
      return (
        <View style={styles.container}>
          <MapView
            provider={this.props.provider}
            style={styles.map}
            initialRegion={this.state.region}
            onPress={this.onMapPress}
          >
            {this.state.markers.map(marker => (
              <MapView.Marker
                title={marker.key}
                image={flagPinkImg}
                key={marker.key}
                coordinate={marker.coordinate}
              />
            ))}
          </MapView>
          <View style={styles.buttonContainer}>
            <TouchableOpacity
              onPress={() => this.setState({ markers: [] })}
              style={styles.bubble}
            >
              <Text>Tap to create a marker of random color</Text>
            </TouchableOpacity>
          </View>
        </View>
      );
    }
  }
  
  CustomMarkers.propTypes = {
    provider: MapView.ProviderPropType,
  };
  
  const styles = StyleSheet.create({
    container: {
      ...StyleSheet.absoluteFillObject,
      justifyContent: 'flex-end',
      alignItems: 'center',
    },
    map: {
      ...StyleSheet.absoluteFillObject,
    },
    bubble: {
      backgroundColor: 'rgba(255,255,255,0.7)',
      paddingHorizontal: 18,
      paddingVertical: 12,
      borderRadius: 20,
    },
    latlng: {
      width: 200,
      alignItems: 'stretch',
    },
    button: {
      width: 80,
      paddingHorizontal: 12,
      alignItems: 'center',
      marginHorizontal: 10,
    },
    buttonContainer: {
      flexDirection: 'row',
      marginVertical: 20,
      backgroundColor: 'transparent',
    },
  });
  
  module.exports = CustomMarkers;
  