expo Map method

map.js

import React from 'react';
import { Platform} from 'react-native';
import { MapView,Location, Permissions,Constants } from 'expo';

export default class App extends React.Component {
  
  state = {
    location: null,
    errorMessage: null,
  };
  
  componentWillMount() {
    if (Platform.OS === 'android' && !Constants.isDevice) {
      this.setState({
        errorMessage: 'Oops, this will not work on Sketch in an Android emulator. Try it on your device!',
      });
    } else {
      this._getLocationAsync();
    }
  }

  _getLocationAsync = async () => {
    let { status } = await Permissions.askAsync(Permissions.LOCATION);
    if (status !== 'granted') {
      this.setState({
        errorMessage: 'Permission to access location was denied',
      });
    }

    let location = await Location.getCurrentPositionAsync({});
    this.setState({ location });
    console.log(this.state.location)
  };
  render() {
    return (
      <MapView
        style={{ flex: 1 }}
        initialRegion={{
          latitude:110.4323532 ,
          longitude:21.2353182,
          latitudeDelta: 0.0922,
          longitudeDelta: 0.0421,
        }}
      />
    );
  }
}