App.js

import React from 'react';
import { StyleSheet, Text, View, TouchableOpacity } from 'react-native';
import MainHRMap from './HRMap.js';
import { NativeModules } from 'react-native';
let HEREMap = NativeModules.HRMapManager;
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));


export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      routeParams: {
        OriginLat: 0,
        OriginLng: 0,
        DestinationLat: 0,
        DestinationLng: 0
      },
      initCoords: {
        Lat: 40.668727,
        Lng: -73.992850
      },
      ButtonText: 'Create Route'
    }
    this.createRoute = this.createRoute.bind(this);
  }

  createRoute() {
    if (this.state.ButtonText !== 'Navigate') {
      this.setState({
        routeParams: {
          OriginLat: 40.668727,
          OriginLng: -73.992850,
          DestinationLat: 41.070640,
          DestinationLng: -71.860219
        },
        ButtonText: 'Navigate'
      })
    } else {
      sleep(100).then(() => HEREMap.Action('Navigate'));
    }


  }

  render() {
    return (
      <View style={styles.container}>

        <MainHRMap

          InitCoords={this.state.initCoords}
          routeParams={this.state.routeParams}

          style={{
            justifyContent: 'center',
            alignItems: 'center',
            backgroundColor: '#FF0000',
            height: 400,
            width: 400
          }}

        />
        <TouchableOpacity style={styles.button} onPress={this.createRoute}><Text>{this.state.ButtonText}</Text></TouchableOpacity>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  button: {
    width: 200,
    height: 30,
    backgroundColor: '#ccc',
    alignItems: 'center',
    justifyContent: 'center'
  }
});