Show my location in map react-native - react-native

Question

i'm React-Native newbie
I have created a google map but i want when i open my app, it will show my location first. How can i do it ?
Here is my code
export default class GoogleMapApi extends Component {
state = {
mapRegion: null,
lastLat: null,
lastLong: null,
}
componentDidMount() {
this.watchID = navigator.geolocation.watchPosition((position) => {
let region = {
latitude: position.coords.latitude,
longitude: position.coords.longitude,
latitudeDelta: 0.00922*1.5,
longitudeDelta: 0.00421*1.5
}
this.onRegionChange(region, region.latitude, region.longitude);
});
}
onRegionChange(region, lastLat, lastLong) {
this.setState({
mapRegion: region,
// If there are no new values set use the the current ones
lastLat: lastLat || this.state.lastLat,
lastLong: lastLong || this.state.lastLong
});
}
And
componentWillUnmount() {
navigator.geolocation.clearWatch(this.watchID);
}
onMapPress(e) {
console.log(e.nativeEvent.coordinate.longitude);
let region = {
latitude: e.nativeEvent.coordinate.latitude,
longitude: e.nativeEvent.coordinate.longitude,
latitudeDelta: 0.00922*1.5,
longitudeDelta: 0.00421*1.5
}
this.onRegionChange(region, region.latitude, region.longitude);
}
render() {
return (
<View style={{flex: 1}}>
<MapView
style={styles.map}
region={this.state.mapRegion}
showsUserLocation={true}
followUserLocation={true}
onRegionChange={this.onRegionChange.bind(this)}
onPress={this.onMapPress.bind(this)}>
<MapView.Marker
coordinate={{
latitude: (this.state.lastLat + 0.00050) || -36.82339,
longitude: (this.state.lastLong + 0.00050) || -73.03569,
}}>
<View>
<Text style={{color: '#000'}}>
{ this.state.lastLong } / { this.state.lastLat }
</Text>
</View>
</MapView.Marker>
</MapView>
</View>
);
}
}

Answer 1

To get your current location you can use GeoLocation library of react-native, the docs for that is here(geoLocation).
`static getCurrentPosition(geo_success, geo_error?, geo_options?)`
docs for above method avaible here.
You have to use this method to get your current location coordinates and use those coordinates to see your location in maps.