react-native-maps get current location

I want to display my current location but I cannot.

I add permission code to AndroidManifest.xml like below.

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

However my emulator did not ask to me 'Allow to 00 access your location while you are using the app'.

Below is my app.js code.

import React, { Component } from 'react';
import { Alert, StyleSheet, Text, View, TouchableOpacity, PermissionsAndroid } from 'react-native';

export default class App extends Component {
    state = {
        location: null
    };

    findCoordinates = () => {
        navigator.geolocation.getCurrentPosition(
            position => {
                const location = JSON.stringify(position);

                this.setState({ location });
            },
            error => Alert.alert(error.message),
            { enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 }
        );
    };

    render() {
        return (
            <View style={styles.container}>
                <TouchableOpacity onPress={this.findCoordinates}>
                    <Text style={styles.welcome}>Find My Coords?</Text>
                    <Text>Location: {this.state.location}</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#F5FCFF'
    },
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10
    }
});