Related
In this article, I am going to use 3 Huawei kits in one project:
· Map Kit, for personalizing how your map displays and interact with your users, also making location-based services work better for your users.
· Location Kit, for getting the user’s current location with fused location function, also creating geofences.
· Site Kit, for searching and exploring the nearby places with their addresses.
What is a Geo-fence?
Geofence literally means a virtual border around a geographic area. Geofencing technology is the name of the technology used to trigger an automatic alert when an active device enters a defined geographic area (geofence).
As technology developed, brands started to reach customers. Of course, at this point, with digital developments, multiple new marketing terms started to emerge. Geofencing, a new term that emerged with this development, entered the lives of marketers.
Project Setup
HMS Integration
Firstly, you need a Huawei Developer account and add an app in Projects in AppGallery Connect console. So that you can activate the Map, Location and Site kits and use them in your app. If you don’t have an Huawei Developer account and don’t know the steps please follow the links below.
· Register Huawei developer website
· Configuring app information in AppGallery Connect
· Integrating Map Kit Flutter Plugin
· Integrating Location Kit Flutter Plugin
· Integrating Site Kit Flutter Plugin
Important: While adding app, the package name you enter should be the same as your Flutter project’s package name.
Note: Before you install agconnect-services.json file, make sure the required kits are enabled.
Permissions
In order to make your kits work perfectly, you need to add the permissions below in AndroidManifest.xml file.
Code:
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
Creating Flutter Application
Add Dependencies to ‘pubspec.yaml’
After completing all the steps above, you need to add the required kits’ Flutter plugins as dependencies to pubspec.yaml file. You can find all the plugins in pub.dev with the latest versions. You can follow the steps in installing section of the following links.
· Map Kit Plugin for Flutter
· Location Kit Plugin for Flutter
· Site Kit Plugin for Flutter
Code:
dependencies:
flutter:
sdk: flutter
huawei_location: ^5.0.0+301
huawei_site: ^5.0.1+300
huawei_map: ^4.0.4+300
After adding them, run flutter pub get command.
All the plugins are ready to use!
Request Location Permission and Get Current Location
Create a PermissionHandler instance and initialize it in initState to ask for permission. Also, follow the same steps for FusedLocationProviderClient. With locationService object, we can get the user’s current location by calling getLastLocation() method.
Code:
LatLng center;
PermissionHandler permissionHandler;
FusedLocationProviderClient locationService;
@override
void initState() {
permissionHandler = PermissionHandler();
locationService = FusedLocationProviderClient();
getCurrentLatLng();
super.initState();
}
getCurrentLatLng() async {
await requestPermission();
Location currentLocation = await locationService.getLastLocation();
LatLng latLng = LatLng(currentLocation.latitude, currentLocation.longitude);
setState(() {
center = latLng;
});
}
In requestPermission() method, you can find both Location Permission and Background Location Permission.
Code:
requestPermission() async {
bool hasPermission = await permissionHandler.hasLocationPermission();
if (!hasPermission) {
try {
bool status = await permissionHandler.requestLocationPermission();
print("Is permission granted $status");
} catch (e) {
print(e.toString());
}
}
bool backgroundPermission =
await permissionHandler.hasBackgroundLocationPermission();
if (!backgroundPermission) {
try {
bool backStatus =
await permissionHandler.requestBackgroundLocationPermission();
print("Is background permission granted $backStatus");
} catch (e) {
print(e.toString);
}
}
}
When you launch the app for the first time, the location permission screen will appear.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Add HuaweiMap
Huawei Map is the main layout of this project. It will cover all the screen and also we will add some buttons on it, so we should put HuaweiMap and other widgets into a Stack widget. Do not forget to create a Huawei map controller.
Code:
static const double _zoom = 16;
Set<Marker> _markers = {};
int _markerId = 1;
Set<Circle> _circles = {};
int _circleId = 1;
_onMapCreated(HuaweiMapController controller) {
mapController = controller;
}
Stack(
fit: StackFit.expand,
children: <Widget>[
HuaweiMap(
onMapCreated: _onMapCreated,
initialCameraPosition:
CameraPosition(target: center, zoom: _zoom),
mapType: MapType.normal,
onClick: (LatLng latLng) {
placeSearch(latLng);
selectedCoordinates = latLng;
_getScreenCoordinates(latLng);
setState(() {
clicked = true;
addMarker(latLng);
addCircle(latLng);
});
},
markers: _markers,
circles: _circles,
tiltGesturesEnabled: true,
buildingsEnabled: true,
compassEnabled: true,
zoomControlsEnabled: true,
rotateGesturesEnabled: true,
myLocationButtonEnabled: true,
myLocationEnabled: true,
trafficEnabled: false,
),
],
)
We have got the current location with Location service’s getLastLocation() method and assigned it to center variables as longitude and latitude. While creating the HuaweiMap widget, assign that center variable to HuaweiMap’s target property, so that the app opens with a map showing the user’s current location.
Code:
placeSearch(LatLng latLng) async {
NearbySearchRequest request = NearbySearchRequest();
request.location = Coordinate(lat: latLng.lat, lng: latLng.lng);
request.language = "en";
request.poiType = LocationType.ADDRESS;
request.pageIndex = 1;
request.pageSize = 1;
request.radius = 100;
NearbySearchResponse response = await searchService.nearbySearch(request);
try {
print(response.sites);
site = response.sites[0];
} catch (e) {
print(e.toString());
}
}
When onClick method of HuaweiMap is triggered, call placeSearch using the Site Kit’s nearbySearch method. Thus, you will get a Site object to assign to the new geofence you will add.
Create Geofence
When the user touch somewhere on the map; a marker, a circle around the marker, a Slider widget to adjust the radius of the circle, and a button named “Add Geofence” will show up on the screen. So we will use a boolean variable called clicked and if it’s true, the widgets I have mentioned in the last sentence will be shown.
Code:
addMarker(LatLng latLng) {
if (marker != null) marker = null;
marker = Marker(
markerId: MarkerId(_markerId.toString()), //_markerId is set to 1
position: latLng,
clickable: true,
icon: BitmapDescriptor.defaultMarker,
);
setState(() {
_markers.add(marker);
});
selectedCoordinates = latLng;
_markerId++; //after a new marker is added, increase _markerId for the next marker
}
_drawCircle(Geofence geofence) {
this.geofence = geofence;
if (circle != null) circle = null;
circle = Circle(
circleId: CircleId(_circleId.toString()),
fillColor: Colors.grey[400],
strokeColor: Colors.red,
center: selectedCoordinates,
clickable: false,
radius: radius,
);
setState(() {
_circles.add(circle);
});
_circleId++;
}
Create a Slider widget wrapped with a Positioned widget and put them into Stack widget as shown below.
Code:
if (clicked)
Positioned(
bottom: 10,
right: 10,
left: 10,
child: Slider(
min: 50,
max: 200,
value: radius,
onChanged: (newValue) {
setState(() {
radius = newValue;
_drawCircle(geofence);
});
},
),
),
After implementing addMarker and drawCircle methods and adding Slider widget, now we will create AddGeofence Screen and it will appear as a ModalBottomSheet when AddGeofence button is clicked.
Code:
RaisedButton(
child: Text("Add Geofence"),
onPressed: () async {
geofence.uniqueId = _fenceId.toString();
geofence.radius = radius;
geofence.latitude = selectedCoordinates.lat;
geofence.longitude = selectedCoordinates.lng;
_fenceId++;
final clickValue = await showModalBottomSheet(
context: context,
isScrollControlled: true,
builder: (context) => SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(
bottom: MediaQuery.of(context).viewInsets.bottom),
child: AddGeofenceScreen(
geofence: geofence,
site: site,
),
),
),
);
updateClicked(clickValue);
//When ModalBottomSheet is closed, pass a bool value in Navigator
//like Navigator.pop(context, false) so that clicked variable will be
//updated in home screen with updateClicked method.
},
),
void updateClicked(bool newValue) {
setState(() {
clicked = newValue;
});
}
In the new stateful AddGeofenceScreen widget’s state class, create GeofenceService and SearchService instances and initialize them in initState.
Code:
GeofenceService geofenceService;
int selectedConType = Geofence.GEOFENCE_NEVER_EXPIRE;
SearchService searchService;
@override
void initState() {
geofenceService = GeofenceService();
searchService = SearchService();
super.initState();
}
To monitor address, radius and also to select conversion type of the geofence, we will show a ModalBottomSheet with the widgets shown below.
Code:
Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text(
"Address",
style: boldStyle,
),
Text(site.formatAddress),
Text(
"\nRadius",
style: boldStyle,
),
Text(geofence.radius.toInt().toString()),
Text(
"\nSelect Conversion Type",
style: boldStyle,
),
Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
RadioListTile<int>(
dense: true,
title: Text(
"Enter",
style: TextStyle(fontSize: 14),
),
value: Geofence.ENTER_GEOFENCE_CONVERSION,
groupValue: selectedConType,
onChanged: (int value) {
setState(() {
selectedConType = value;
});
},
),
RadioListTile<int>(
dense: true,
title: Text("Exit"),
value: Geofence.EXIT_GEOFENCE_CONVERSION,
groupValue: selectedConType,
onChanged: (int value) {
setState(() {
selectedConType = value;
});
},
),
RadioListTile<int>(
dense: true,
title: Text("Stay"),
value: Geofence.DWELL_GEOFENCE_CONVERSION,
groupValue: selectedConType,
onChanged: (int value) {
setState(() {
selectedConType = value;
});
},
),
RadioListTile<int>(
dense: true,
title: Text("Never Expire"),
value: Geofence.GEOFENCE_NEVER_EXPIRE,
groupValue: selectedConType,
onChanged: (int value) {
setState(() {
selectedConType = value;
});
},
),
],
),
Align(
alignment: Alignment.bottomRight,
child: FlatButton(
child: Text(
"SAVE",
style: TextStyle(
color: Colors.blue, fontWeight: FontWeight.bold),
),
onPressed: () {
geofence.conversions = selectedConType;
addGeofence(geofence);
Navigator.pop(context, false);
},
),
)
],
),
For each conversion type, add a RadioListTile widget.
When you click SAVE button, addGeofence method will be called to add new Geofence to the list of Geofences, then return to the Home screen with false value to update clicked variable.
In addGeofence, do not forget to call createGeofenceList method with the list you have just added the geofence in.
Code:
void addGeofence(Geofence geofence) {
geofence.dwellDelayTime = 10000;
geofence.notificationInterval = 100;
geofenceList.add(geofence);
GeofenceRequest geofenceRequest = GeofenceRequest(geofenceList:
geofenceList);
try {
int requestCode = await geofenceService.createGeofenceList
(geofenceRequest);
print(requestCode);
} catch (e) {
print(e.toString());
}
}
To listen to the geofence events, you need to use onGeofenceData method in your code.
Code:
GeofenceService geofenceService;
StreamSubscription<GeofenceData> geofenceStreamSub;
@override
void initState() {
geofenceService = GeofenceService();
geofenceStreamSub = geofenceService.onGeofenceData.listen((data) {
infoText = data.toString(); //you can use this infoText to show a toast message to the user.
print(data.toString);
});
super.initState();
}
Search Nearby Places
In home screen, place a button onto the map to search nearby places with a keyword and when it is clicked a new alertDialog page will show up.
Code:
void _showAlertDialog() {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Search Location"),
content: Container(
height: 150,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
TextField(
controller: searchQueryController,
),
MaterialButton(
color: Colors.blue,
child: Text(
"Search",
style: TextStyle(color: Colors.white),
),
onPressed: () async {
Navigator.pop(context);
_markers =
await nearbySearch(center, searchQueryController.text);
setState(() {});
},
)
],
),
),
actions: [
FlatButton(
child: Text("Close"),
onPressed: () {
Navigator.pop(context);
},
),
],
);
},
);
}
After you enter the keyword and click Search button, there will be markers related to the keyword will appear on the map.
Conclusion
In this article you have learnt how to use some of the features of Huawei Map, Location and Site kits in your projects. Also, you have learnt the geofencing concept. Now you can add geofences to your app and with geofencing, you can define an audience based on a customer’s behavior in a specific location. With location information, you can show suitable ads to the right people simultaneously, wherever they are.
Thank you for reading this article, I hope it was useful and you enjoyed it!
Huawei is the best Android smartphone devices making company. I don't know why Android creating a so much of issues. I feel bad
Can we show GIF image on huawei map at predefined locaation?
In this article, we can learn to get current and nearby places of user’s device using a Huawei Nearby Place Search API and also to implement it in Huawei Map.
If you want to provide a feature in your app that should display a list of places such as Restaurant, GYM, Banks, Hospitals, Business, Parks, Transport, etc. near the current location of user device, then you need to use Huawei Nearby place search API, MAP and Location Kit to implement it.
Environment Requirement
1) Node JS and Visual Studio.
2) The JDK version must be 1.8 or later.
3) React Native Location, Map and Site Plugin is not supported by Expo CLI. Use React Native CLI instead.
Project Setup
1) Creating New Project.
Code:
react-native init project name
2) Generating a Signing Certificate Fingerprint.
Use following command for generating certificate.
Code:
keytool -genkey -keystore <application_project_dir>\android\app\<signing_certificate_fingerprint_filename>.jks -storepass <store_password> -alias <alias> -keypass <key_password> -keysize 2048 -keyalg RSA -validity 36500
This command creates the keystore file in application_project_dir/android/app.
The next step is to obtain the SHA256 key.
To obtain it, enter the following command in terminal:
Code:
keytool -list -v -keystore <application_project_dir>\android\app\<signing_certificate_fingerprint_filename>.jks
After an authentication, user can see SHA256 in below picture
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
3) Create an app in the Huawei AppGallery Connect.
4) Provide the SHA256 Key in App Information section.
5) Enable Map and Site kit service under Manage APIs section.
6) Download and add the agconnect-services.json file in your project.
7) Copy and paste the below maven url inside the repositories of build script and all projects (project build.gradle file):
Java:
maven { url 'http://developer.huawei.com/repo/' }
8) Copy and paste the below AppGallery Connect plugin for the HMS SDK inside dependencies (project build.gradle file):
Java:
classpath 'com.huawei.agconnect:agcp:1.4.2.301'
9) Make sure that the minSdkVersion for your application project is 19 or higher.
10) Download the Huawei Location, Map and Site kit plugin using the following command.
Code:
npm i @hmscore/react-native-hms-location
npm i @hmscore/react-native-hms-map
npm i @hmscore/react-native-hms-site
11) Add Permissions in Android Manifest file.
XML:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION"/>
Nearby Places Example
Now let’s see how to use places API to get list of nearby places based on user’s current location, display them in Map and show the current location along with address on Huawei maps.
Step 1: Using the Places API requires ACCESS_FINE_LOCATION permission, so you need to request that in your JS file:
JavaScript:
HMSLocation.FusedLocation.Native.hasPermission()
.then((result) => setHasLocationPermission(result))
.catch(HMSLocation.FusedLocation.Native.requestPermission());
Step 2: Finding Current Location and Address:
JavaScript:
HMSLocation.FusedLocation.Native.getLastLocation()
.then((pos) => (position ? null : setPosition(pos)))
.catch((err) => console.log('Failed to get last location', err));
HMSLocation.FusedLocation.Native.getLastLocationWithAddress(locationRequest)
.then((pos) => (address ? null : setAddress(pos)))
.catch((err) => console.log('Failed to get last location address', err));
Step 3: Initialize the Site kit and get list of places such as Restaurant near the current location of user device:
JavaScript:
Position ? RNHMSSite.initializeService(config)
.then(() => {
nearbySearchReq = {
location: {
lat: position.latitude,
lng: position.longitude,
},
radius: 5000,
hwPoiType: RNHMSSite.HwLocationType.RESTAURANT,
poiType: RNHMSSite.LocationType.GYM,
countryCode: 'IN',
language: 'en',
pageIndex: 1,
pageSize: 20,
politicalView: 'en',
};
site.length === 0
? RNHMSSite.nearbySearch(nearbySearchReq)
.then((res) => {
setSite(res.sites);
console.log(JSON.stringify(res));
mapView.setCameraPosition({
target: {
latitude: site[0].location.lat,
longitude: site[0].location.lng,
},
zoom: 17,
});
})
.catch((err) => {
console.log(JSON.stringify(err));
})
: null;
})
.catch((err) => {
console.log('Error : ' + err);
})
Step 4: Display a list of places on Map such as Restaurant near the current location of user device:
JavaScript:
<MapView
style={{ height: 590 }}
camera={{
target: {
latitude: position.latitude,
longitude: position.longitude,
},
zoom: 15,
}}
ref={(e) => (mapView = e)}
myLocationEnabled={true}
markerClustering={true}
myLocationButtonEnabled={true}
rotateGesturesEnabled={true}
scrollGesturesEnabled={true}
tiltGesturesEnabled={true}
zoomGesturesEnabled={true}>
{site != null
? Object.keys(site).map(function (key, i) {
return (
<Marker
visible={true}
coordinate={{
latitude: site[i].location.lat,
longitude: site[i].location.lng,
}}
clusterable>
<InfoWindow
style={{
alignContent: 'center',
justifyContent: 'center',
borderRadius: 8,
}}>
<View style={style.markerSelectedHms}>
<Text
style={style.titleSelected}>{`${site[i].name}`}</Text>
</View>
</InfoWindow>
</Marker>
);
})
: null}
</MapView>
Step 5: Get Current location address:
JavaScript:
address ? (
<View style={style.bottomView,{ backgroundColor: "white"}}>
<View style={{ flexDirection: "row" ,marginStart: 10}}>
<Image source={require('../assets/home.png')} style={{ width: 40, height: 40 }}/>
<Text style={{ marginTop: 10 ,marginStart: 10 }}>My Address</Text>
</View>
<Text style={style.textStyle}> {address.featureName + ", " +address.city+", Postal Code = "+address.postalCode} </Text>
</View>
)
Nearby Places Example Output:
Complete Code:
Copy and paste following code in your App.js file:
JavaScript:
import 'react-native-gesture-handler';
import * as React from 'react';
import { StyleSheet} from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import MapComponent from './components/MapComponent';
const Stack = createStackNavigator();
function App() {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home"
component={MapComponent}
options={{ title: 'Huawei Map' }}
/>
</Stack.Navigator>
</NavigationContainer>
);
}
const styles = StyleSheet.create({
MainContainer: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
text: {
textAlign: 'center',
margin: 12,
fontSize: 22,
fontWeight: "100",
},
});
export default App;
Copy and paste following code in your MapComponent.js file:
1. Create folder components inside components, create a file called MapComponent.js.
2. Add the generated API key.
JavaScript:
import React, { Component, useState, useEffect } from 'react';
import { ActivityIndicator, SafeAreaView, View, Text , Image} from 'react-native';
import RNHMSSite from '@hmscore/react-native-hms-site';
import HMSLocation from '@hmscore/react-native-hms-location';
import MapView, { Marker, InfoWindow } from '@hmscore/react-native-hms-map';
let mapView, nearbySearchReq;const
config = {
apiKey: 'YOUR API KEY',
};
const GetPermssions = () => {
const [hasLocationPermission, setHasLocationPermission] = useState(false);
const [position, setPosition] = useState();
const [site, setSite] = useState([]);
const [address, setAddress] = useState();
locationRequest = {
priority: HMSLocation.FusedLocation.PriorityConstants.PRIORITY_HIGH_ACCURACY,
interval: 3,
numUpdates: 10,
fastestInterval: 1000.0,
expirationTime: 1000.0,
expirationTimeDuration: 1000.0,
smallestDisplacement: 0.0,
maxWaitTime: 10000.0,
needAddress: true,
language: "en",
countryCode: "en",
};
useEffect(() => {
HMSLocation.FusedLocation.Native.hasPermission()
.then((result) => setHasLocationPermission(result))
.catch(HMSLocation.FusedLocation.Native.requestPermission());
}, []);
if (hasLocationPermission) {
HMSLocation.FusedLocation.Native.getLastLocation()
.then((pos) => (position ? null : setPosition(pos)))
.catch((err) => console.log('Failed to get last location', err));
HMSLocation.FusedLocation.Native.getLastLocationWithAddress(locationRequest)
.then((pos) => (address ? null : setAddress(pos)))
.catch((err) => console.log('Failed to get last location address', err));
position
? RNHMSSite.initializeService(config)
.then(() => {
nearbySearchReq = {
location: {
lat: position.latitude,
lng: position.longitude,
},
radius: 5000,
hwPoiType: RNHMSSite.HwLocationType.RESTAURANT,
poiType: RNHMSSite.LocationType.GYM,
countryCode: 'IN',
language: 'en',
pageIndex: 1,
pageSize: 20,
politicalView: 'en',
};
site.length === 0
? RNHMSSite.nearbySearch(nearbySearchReq)
.then((res) => {
setSite(res.sites);
console.log(JSON.stringify(res));
mapView.setCameraPosition({
target: {
latitude: site[0].location.lat,
longitude: site[0].location.lng,
},
zoom: 17,
});
})
.catch((err) => {
console.log(JSON.stringify(err));
})
: null;
})
.catch((err) => {
console.log('Error : ' + err);
})
: null;
} else {
HMSLocation.FusedLocation.Native.requestPermission();
}
return (
<SafeAreaView
style={{
flex: 1,
}}>
{position ? (
<View>
<MapView
style={{ height: 590 }}
camera={{
target: {
latitude: position.latitude,
longitude: position.longitude,
},
zoom: 15,
}}
ref={(e) => (mapView = e)}
myLocationEnabled={true}
markerClustering={true}
myLocationButtonEnabled={true}
rotateGesturesEnabled={true}
scrollGesturesEnabled={true}
tiltGesturesEnabled={true}
zoomGesturesEnabled={true}>
{site != null
? Object.keys(site).map(function (key, i) {
return (
<Marker
visible={true}
coordinate={{
latitude: site[i].location.lat,
longitude: site[i].location.lng,
}}
clusterable>
<InfoWindow
style={{
alignContent: 'center',
justifyContent: 'center',
borderRadius: 8,
}}>
<View style={style.markerSelectedHms}>
<Text
style={style.titleSelected}>{`${site[i].name}`}</Text>
</View>
</InfoWindow>
</Marker>
);
})
: null}
</MapView>
</View>
) : (
<ActivityIndicator size="large" color="#0000ff" />
)}
{address ? (
<View style={style.bottomView,{ backgroundColor: "white"}}>
<View style={{ flexDirection: "row" ,marginStart: 10}}>
<Image source={require('../assets/home.png')} style={{ width: 40, height: 40 }}/>
<Text style={{ marginTop: 10 ,marginStart: 10 }}>My Address</Text>
</View>
<Text style={style.textStyle}> {address.featureName + ", " +address.city+", Postal Code = "+address.postalCode} </Text>
</View>
) : (
<ActivityIndicator s size="large" color="#0000ff" />
)}
</SafeAreaView>
);
};
export default class MapComponent extends Component {
render() {
return <GetPermssions />;
}
}
const style = (base) => ({
markerSelectedHms: {
flexDirection: 'row',
height: 50,
borderRadius: base.radius.default,
overflow: 'hidden',
alignSelf: 'center',
alignItems: 'center',
alignContent: 'center',
justifyContent: 'space-between',
},
bottomView: {
width: '100%',
height: 50,
backgroundColor: 'white',
position: 'absolute', //Here is the trick
bottom: 0, //Here is the trick
},
textStyle: {
color: '#000',
fontSize: 18,
}
});
Run the application:
Code:
react-native run-android
Tips and Tricks:
1) Do not forget to add API key in MapComponent.JS file.
2) Do not forget to enable Map and Site kit service in AGC console APP Gallery connect > Manage APIs section.
Conclusion:
In this article, you have learned to setting up your react native project for Huawei Nearby place API, getting list of places near current location of device, displaying list of places in Map with markers and displaying current location on Map with address.
Reference:
1) React native Plugin
2) Site Kit
3) Location Kit
4) Map Kit
Read In Forum
Can we search multiple POI in one requrest?
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
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"lightbox_download": "Download",
"lightbox_share": "Share",
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"lightbox_new_window": "New window",
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Article Introduction
In this article we will develop Qibla finder application for Huawei Smart Watch device using Huawei DevEco Studio (HarmonyOS). We will fetch Location and Compass API’s of HarmonyOS JS language to develop Application.
1. Create New Project
Let’s create Smart Watch Project and choosing ability template, Wearable and Empty Feature Ability (JS)
Define project name, package name and relevant directory where you want to save your project.
2. Preparing Files and Permission
Let’s first add images and permissions which we will use for project.
All project images will be under common/images folder, check below screenshot.
Next we need to add permissions for Internet and Location under config.json file.
JSON:
"reqPermissions": [
{
"name": "ohos.permission.INTERNET"
},
{
"name": "ohos.permission.LOCATION",
"reason": "get Qibla direction",
"usedScene": {
"ability": [
"default"
],
"when": "always"
}
}
]
3. Compass Development
In Compass screen development we will cover Location permission, Location fetching, location error and compass degree value.
Let’s start development without wasting more time.
Styling:
index.css:
CSS:
.stack {
width: 454px;
height: 454px;
justify-content: center;
background-color: whitesmoke;
}
.container {
background-color: whitesmoke;
}
.compass-container {
display: flex;
justify-content: center;
align-items: center;
left: 0px;
top: 0px;
width: 454px;
height: 454px;
background-color: whitesmoke;
}
.container-location-loading{
background-image: url('/common/images/background.png');
flex-direction: column;
padding-top: 0px;
padding-bottom: 0px;
height: 456px;
width: 456px;
}
.error-container {
background-image: url('/common/images/background.png');
padding-top: 0px;
padding-bottom: 0px;
height: 456px;
width: 100%;
}
.location_loading{
object-fit:contain;
height: 456px;
width: 292px;
}
.column{
display: flex;
flex-direction: column;
justify-content: center;
width: 100%;
}
.needle{
left: 0px;
top: 0px;
width: 220px;
height: 220px;
background-color: transparent;
z-index:99;
}
.compass, .compass2{
left: 0px;
top: 0px;
width: 220px;
height: 220px;
background-color: transparent;
z-index:98;
}
.qibla_style{
display: flex;
left: 0px;
top: 0px;
width: 220px;
height: 220px;
background-color: transparent;
z-index:100000;
}
.error_title{
display: flex;
color: red;
width: 100%;
height: 100%;
justify-content: center;
align-content: center;
text-align: center;
font-size: 24px;
}
.button-container{
display: flex;
flex-direction: row;
justify-content: center;
align-content: space-around;
position: absolute;
bottom: 10px;
}
Layout:
Location Loading Animation:
Code:
<stack if="{{isLocationLoading === true && isLocationError === false}}" class="container-location-loading">
<image src="../../common/images/location_animation.gif" class="location_loading" />
</stack>
Location Loading Output:
Location Error and Retry:
Code:
<stack if="{{isLocationLoading === false && isLocationError === true}}" class="error-container">
<text class="error_title">Location not fetch. Try again</text>
<div class="button-container">
<button type="circle" icon="/common/images/exit.png" onclick="exit"></button>
<button type="circle" icon="/common/images/refresh.png" onclick="retry"></button>
</div>
</stack>
Location Error Output:
Compass UI:
Code:
<stack class="compass-container" if="{{isLocationLoading === false && isLocationError === false}}">
<stack class="compass" style="transform:{{compass_transform}}">
<div class="needle" style="transform:{{needle_transform}}">
<image src="/common/images/needle.png"></image>
</div>
<div class="compass" >
<image src="/common/images/compass.png"></image>
</div>
</stack>
<div class="qibla_style">
<image src="/common/images/qibla.png"></image>
</div>
</stack>
Compass UI Output:
JS code:
Structural - Code:
Code:
import sensor from '@system.sensor';
import brightness from '@system.brightness';
import geolocation from '@system.geolocation';
import app from '@system.app';
export default {}
Data:
Code:
data: {
compass_transform: "rotate(0deg)",
needle_transform: "rotate(0deg)",
isLocationLoading: true,
isLocationError: false,
}
Common - Code:
Code:
onReady() {
this.setBrightnessKeepScreenOn();
},
onInit() {
this.initLocationCompass();
},
exit(){
app.terminate();
},
retry(){
this.isLocationLoading = true;
this.isLocationError = false;
this.initLocationCompass();
},
onDestroy() {
sensor.unsubscribeCompass();
},
// Setting the screen to be steady on
setBrightnessKeepScreenOn: function () {
brightness.setKeepScreenOn({
keepScreenOn: true,
success: function () {
console.log("handling set keep screen on success")
},
fail: function (data, code) {
console.log("handling set keep screen on fail, code:" + code);
}
});
},
onBackPress() {
sensor.unsubscribeCompass();
}
Location Fetching - Code:
Code:
initLocationCompass(){
var _this = this;
this.locationLoading().then(result => {
console.info("Location: " + result);
_this.loadCompass(result);
_this.isLocationLoading = false;
_this.isLocationError = false;
}, error => {
console.info("Location: error ->" + error);
_this.isLocationLoading = false;
_this.isLocationError = true;
});
},
locationLoading() {
return new Promise(function (resolve, reject) {
return geolocation.getLocation({
success: function (data) {
console.log('success get location data. latitude:' + data.latitude + 'long:' + data.longitude);
return resolve({
latitude: data.latitude,
longitude: data.longitude
});
},
fail: function (data, code) {
console.log('fail to get location. code:' + code + ', data:' + data);
return reject({
error: 'fail to get location. code:' + code + ', data:' + data
});
},
});
});
},
Compass - Code:
Code:
loadCompass(coordinates = {
latitude: 24.7136,
longitude: 46.6753
}) {
var _this = this;
var qiblaDirection = parseFloat(this.qibla(coordinates));
console.log("compass: qiblaDirection: " + qiblaDirection);
_this.needle_transform = "rotate(" + qiblaDirection + "deg)";
sensor.subscribeCompass({
success: function (ret) {
var direction = ret.direction;
var compassDirection = (360 - direction);
_this.compass_transform = "rotate(" + compassDirection + "deg)";
console.log("compass: compassDirection: " + direction);
},
fail: function (data, code) {
console.error('compass: subscribe compass fail, code: ' + code + ', data: ' + data);
},
});
},
Qibla Direction - Code:
Code:
qibla(coordinates) {
const makkah = {
latitude: 21.42252,
longitude: 39.82621
};
const term1 = Math.sin(this.degreesToRadians(makkah.longitude) - this.degreesToRadians(coordinates.longitude));
const term2 = Math.cos(this.degreesToRadians(coordinates.latitude)) * Math.tan(this.degreesToRadians(makkah.latitude));
const term3 = Math.sin(this.degreesToRadians(coordinates.latitude)) * Math.cos(this.degreesToRadians(makkah.longitude) - this.degreesToRadians(coordinates.longitude));
const angle = Math.atan2(term1, term2 - term3);
return this.unwindAngle(this.radiansToDegrees(angle));
},
degreesToRadians(degrees) {
return degrees * Math.PI / 180.0;
},
radiansToDegrees(radians) {
return radians * 180.0 / Math.PI;
},
normalizeToScale(number, max) {
return number - max * Math.floor(number / max);
},
unwindAngle(angle) {
return this.normalizeToScale(angle, 360.0);
},
Compass Screen Notes:
To manage Layout, we need to use <stack> to overlap UI component in layers. First we need to fetch location data and identify the Qibla direction in degree. And call Compass JS API to get compass degree and manage the UI accordingly.
4. Result
Tips and Tricks:
Requesting some data from internet, you must need to add Internet permission in config.json file.
Fetching Location data, you must need to add Internet Permission in config.json file.
Use Dev Eco Studio Previewer to check the screen layout and design. Previewer is developer friendly to Hot release changes on fly.
For better management of big application it’s a good practice to centralize you common scripts and common style in common folder. Add images folder for complete application images.
In JS script when you make some variable, in callback functions you can store the reference of this to some variable and then call reference variable. Like var _this = this.
References:
HarmonyOS JS API Official Documentation: click here
Geographic Location Documentation: click here
Sensor Documentation: click here
Conclusion:
Developers can able to fetch user location data and compass data to make Qibla finder application. While developing application for HarmonyOS developer can get benefit for both JS and JAVA language.
Original Source
IntroductionIn this article, we will be integrating Huawei Map kit and Location kit in Food Delivery application. Huawei Map kit currently allows developer to create map, interactions with map and drawing on a map.
We will be covering all three aspects as the delivery application we need to create map and we need to draw polyline from delivery agent location to user location and on interaction also we are providing i.e. on click the marker we are show popup on the map with details as shown in the result section below.
Development OverviewYou need to install Flutter and Dart plugin in IDE and I assume that you have prior knowledge about the Flutter and Dart.
Hardware Requirements
A computer (desktop or laptop) running Windows 10.
A Huawei phone (with the USB cable), which is used for debugging.
Software Requirements
Java JDK 1.7 or later.
Android studio software or Visual Studio or Code installed.
HMS Core (APK) 4.X or later.
Integration processStep 1. Create flutter project
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Step 2. Add the App level gradle dependencies. Choose inside project Android > app > build.gradle.
Code:
apply plugin:'com.huawei.agconnect'
Add root level gradle dependencies.
Code:
maven {url 'https://developer.huawei.com/repo/'}
classpath 'com.huawei.agconnect:agcp:1.4.1.300'
Add app level gradle dependencies.
Code:
implementation 'com.huawei.hms:maps:5.0.3.302'
implementation 'com.huawei.hms:location:5.0.0.301'
Step 3: Add the below permissions in Android Manifest file.
Code:
<uses-permission android:name="android.permission.INTERNET " />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />
<uses-permission android:name="com.huawei.hms.permission.ACTIVITY_RECOGNITION"/>
Step 4: Add below path in pubspec.yaml file under dependencies.
Step 5 : Create a project in AppGallery Connect.pubspec.yaml
Code:
name: sample_one
description: A new Flutter application.
# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
huawei_map:
path: ../huawei_map/
huawei_location:
path: ../huawei_location/
http: ^0.12.2
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.2
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
# assets:
# - images/a_dot_burr.jpeg
# - images/a_dot_ham.jpeg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
How to check required permissions are granted or not?
Code:
void hasPermission() async {
try {
bool status = await permissionHandler.hasLocationPermission();
setState(() {
message = "Has permission: $status";
if (status) {
getLastLocationWithAddress();
//requestLocationUpdatesByCallback();
} else {
requestPermission();
}
});
} catch (e) {
setState(() {
message = e.toString();
});
}
}
How do I request permission?
Code:
void requestPermission() async {
try {
bool status = await permissionHandler.requestLocationPermission();
setState(() {
message = "Is permission granted $status";
});
} catch (e) {
setState(() {
message = e.toString();
});
}
}
How do I get location data?
Code:
void getLastLocationWithAddress() async {
try {
HWLocation location =
await locationService.getLastLocationWithAddress(locationRequest);
setState(() {
message = location.street +
" " +
location.city +
" " +
location.state +
" " +
location.countryName +
" " +
location.postalCode;
print("Location: " + message);
});
} catch (e) {
setState(() {
message = e.toString();
print(message);
});
}
}
main.dart
Code:
import 'package:flutter/material.dart';
import 'package:huawei_map/map.dart';
import 'package:sample_one/mapscreen2.dart';
import 'package:sample_one/order.dart';
void main() => runApp(App());
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Orders'),
),
body: MyApp(),
),
debugShowCheckedModeBanner: false,
);
}
}
class MyApp extends StatefulWidget {
MyApp({Key key}) : super(key: key);
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
List orders = [
Order(
imageUrl:
"https://www.namesnack.com/images/namesnack-pizza-business-names-5184x3456-20200915.jpeg",
name: "Veg Pizza Special",
username: "Naresh K",
location: new LatLng(12.9698, 77.7500)),
Order(
imageUrl:
"https://www.pizzahutcouponcode.com/wp-content/uploads/2020/12/10.jpg",
name: "Pretzel Rolls ",
username: "Ramesh",
location: new LatLng(12.9698, 77.7500)),
Order(
imageUrl:
"https://www.manusmenu.com/wp-content/uploads/2015/01/1-Chicken-Spring-Rolls-9-1-of-1.jpg",
name: "Special Veg Rolls",
username: "Mahesh N",
location: new LatLng(12.9598, 77.7540)),
Order(
imageUrl:
"https://www.thespruceeats.com/thmb/axBJnjZ_30_-iHgjGzP1tS4ssGA=/4494x2528/smart/filters:no_upscale()/thai-fresh-rolls-with-vegetarian-option-3217706_form-rolls-step-07-f2d1c96942b04dd0830026702e697f17.jpg",
name: "The Great Wall of China",
username: "Chinmay M",
location: new LatLng(12.9098, 77.7550)),
Order(
imageUrl:
"https://cdn.leitesculinaria.com/wp-content/uploads/2021/02/pretzel-rolls-fp.jpg.optimal.jpg",
name: "Pretzel Rolls",
username: "Ramesh",
location: new LatLng(12.9658, 77.7400)),
Order(
imageUrl:
"https://dinnerthendessert.com/wp-content/uploads/2019/01/Egg-Rolls-3.jpg",
name: "Egg Rolls",
username: "Preeti",
location: new LatLng(12.9618, 77.7700)),
Order(
imageUrl:
"https://images.immediate.co.uk/production/volatile/sites/30/2020/08/recipe-image-legacy-id-1081476_12-9367fea.jpg",
name: "Easy Spring Rolls",
username: "Nithin ",
location: new LatLng(12.9218, 77.7100)),
];
@override
void initState() {
// TODO: implement initState
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white60,
body: SingleChildScrollView(
child: Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
child: Stack(
children: <Widget>[
Container(
padding: EdgeInsets.only(top: 1),
height: MediaQuery.of(context).size.height,
width: double.infinity,
child: ListView.builder(
itemCount: orders.length,
itemBuilder: (context, index) {
return ListTile(
leading: Image.network(orders[index].imageUrl),
title: Text(orders[index].name),
onTap: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => MapPage(
orders[index].name, orders[index].location)));
},
subtitle: Text(orders[index].username),
);
},
),
),
],
),
),
),
);
}
}
mapscreen.dart
Code:
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:huawei_map/map.dart';
import 'package:sample_one/directionapiutil.dart';
import 'package:sample_one/routerequest.dart';
import 'package:sample_one/routeresponse.dart';
class MapPage extends StatefulWidget {
String name;
LatLng location;
MapPage(this.name, this.location);
@override
_MapPageState createState() => _MapPageState(name, location);
}
class _MapPageState extends State<MapPage> {
String name, dist = '';
LatLng location, dest_location = new LatLng(12.9709, 77.7257);
_MapPageState(this.name, this.location);
HuaweiMapController _mapController;
final Set<Marker> _markers = {};
final Set<Polyline> _polyLines = {};
final List<LatLng> _points = [];
BitmapDescriptor _markerIcon;
List<LatLng> polyList = [
LatLng(12.9970, 77.6690),
LatLng(12.9569, 77.7011),
LatLng(12.9177, 77.6238)
];
@override
void initState() {
super.initState();
_loadMarkers(location);
showDirection();
}
@override
Widget build(BuildContext context) {
//_customMarker(context);
return new Scaffold(
appBar: null,
body: Stack(
children: [
_buildMap(),
Positioned(
top: 10,
right: 40,
left: 40,
child: ButtonBar(
buttonPadding: EdgeInsets.all(15),
alignment: MainAxisAlignment.center,
children: <Widget>[
/* new RaisedButton(
onPressed: showDirection,
child: new Text("Show direction",
style: TextStyle(fontSize: 20.0)),
color: Colors.green,
),*/
Center(
child: new Text(
"$dist",
style:
TextStyle(fontSize: 20.0, backgroundColor: Colors.cyan),
),
),
/* new RaisedButton(
onPressed: _showPolygone,
child: new Text("Polygon",
style: TextStyle(fontSize: 20.0, color: Colors.white)),
color: Colors.lightBlueAccent,
),*/
],
),
)
],
),
);
}
_buildMap() {
return HuaweiMap(
initialCameraPosition: CameraPosition(
target: location,
zoom: 12.0,
bearing: 30,
),
onMapCreated: (HuaweiMapController controller) {
_mapController = controller;
},
mapType: MapType.normal,
tiltGesturesEnabled: true,
buildingsEnabled: true,
compassEnabled: true,
zoomControlsEnabled: true,
rotateGesturesEnabled: true,
myLocationButtonEnabled: true,
myLocationEnabled: true,
trafficEnabled: true,
markers: _markers,
polylines: _polyLines,
onClick: (LatLng latlong) {
setState(() {
//createMarker(latlong);
});
},
);
}
void showRouteBetweenSourceAndDestination(
LatLng sourceLocation, LatLng destinationLocation) async {
RouteRequest request = RouteRequest(
origin: LocationModel(
lat: sourceLocation.lat,
lng: sourceLocation.lng,
),
destination: LocationModel(
lat: destinationLocation.lat,
lng: destinationLocation.lng,
),
);
try {
RouteResponse response = await DirectionUtils.getDirections(request);
setState(() {
drawRoute(response);
dist = response.routes[0].paths[0].distanceText;
});
} catch (Exception) {
print('Exception: Failed to load direction response');
}
}
drawRoute(RouteResponse response) {
if (_polyLines.isNotEmpty) _polyLines.clear();
if (_points.isNotEmpty) _points.clear();
var steps = response.routes[0].paths[0].steps;
for (int i = 0; i < steps.length; i++) {
for (int j = 0; j < steps[i].polyline.length; j++) {
_points.add(steps[i].polyline[j].toLatLng());
}
}
setState(() {
_polyLines.add(
Polyline(
width: 2,
polylineId: PolylineId("route"),
points: _points,
color: Colors.blueGrey),
);
/*for (int i = 0; i < _points.length - 1; i++) {
totalDistance = totalDistance +
calculateDistance(
_points[i].lat,
_points[i].lng,
_points[i + 1].lat,
_points[i + 1].lng,
);
}*/
});
}
void _loadMarkers(LatLng location) {
if (_markers.length > 0) {
setState(() {
_markers.clear();
});
} else {
setState(() {
_markers.add(Marker(
markerId: MarkerId('marker_id_1'),
position: location,
icon: _markerIcon,
infoWindow: InfoWindow(
title: 'Delivery agent',
snippet: 'location',
),
rotation: 5));
_markers.add(Marker(
markerId: MarkerId('marker_id_2'),
position: dest_location,
draggable: true,
icon: _markerIcon,
clickable: true,
infoWindow: InfoWindow(
title: 'User',
snippet: 'location',
),
rotation: 5));
});
}
}
void _customMarker(BuildContext context) async {
if (_markerIcon == null) {
final ImageConfiguration imageConfiguration =
createLocalImageConfiguration(context);
BitmapDescriptor.fromAssetImage(
imageConfiguration, 'assets/images/icon.png')
.then(_updateBitmap);
}
}
void _updateBitmap(BitmapDescriptor bitmap) {
setState(() {
_markerIcon = bitmap;
});
}
void createMarker(LatLng latLng) {
Marker marker;
marker = new Marker(
markerId: MarkerId('Welcome'),
position: LatLng(latLng.lat, latLng.lng),
icon: BitmapDescriptor.defaultMarker);
setState(() {
_markers.add(marker);
});
}
void remove() {
setState(() {
_markers.clear();
});
}
showDirection() {
Future.delayed(const Duration(seconds: 1), () {
//setState(() {
showRouteBetweenSourceAndDestination(location, dest_location);
//});
});
}
}
Result
Tips and Tricks
Make sure you have downloaded latest plugin.
Make sure that updated plugin path in yaml.
Make sure that plugin unzipped in parent directory of project.
Makes sure that agconnect-services.json file added.
Make sure dependencies are added build file.
Run flutter pug get after adding dependencies.
Generating SHA-256 certificate fingerprint in android studio and configure in Ag-connect.
ConclusionIn this article, we have learnt how to integrate Huawei Map kit and Location kit in Flutter for the DeliveryApp, where application gets the list of orders and delivery agent click on the order to navigate to map. Similar way you can use Huawei Map kit as per user requirement in your application.
Thank you so much for reading, I hope this article helps you to understand the Huawei Map kit and Location kit in flutter.
ReferencesFlutter map
Flutter plugin
Location Kit
Original Source
What are all the different types of maps it will supports?
can we implement start navigation feature like google map feature?
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Article Introduction
In this article we will develop Prayer Times application for Huawei Smart Watch device using Huawei DevEco Studio (HarmonyOS). We will fetch Location using HarmonyOS JS language API’s and use some of the npm libraries (adhan, moment, moment-timezone, tz-lookup) to develop complete Real world Prayer Times Calculation Application.
1. Create New Project
Let’s create Smart Watch Project and choosing ability template, Empty Ability (JS)
Define project name, package name and relevant directory where you want to save your project. Choose the Device type “wearable” for which we are developing the application.
2. Preparing Files and Permission
Let’s first add images and permissions which we will use for project.
All project images will be under common/images folder, check below screenshot.
Next we need to add Location and Internet permissions under config.json file.
Code:
"reqPermissions": [
{
"name": "ohos.permission.INTERNET"
},
{
"name": "ohos.permission.LOCATION",
"reason": "get user location to show prayer time",
"usedScene": {
"ability": [
"default"
],
"when": "always"
}
}
]
3. NPM libraries installation
We need to install following NPM libraries in the application:
adhan
moment
moment-timezone
tz-lookup
First we need to open the terminal under our DevEco studio project.
We need to change directory to entry folder.
Code:
cd entry
Now we need to install all the required libraries for our project.
Code:
npm i adhan moment moment-timezone tz-lookup -s
After installation our package.json file look like below:
Code:
{
"dependencies": {
"adhan": "^4.1.0",
"moment": "^2.29.1",
"moment-timezone": "^0.5.33",
"tz-lookup": "^6.1.25"
}
}
4. Prayer Time App Development
In Prayer time screen development we will cover Location permission, Location fetching, location error layout, prayer timer screen and today all prayers dialog screen.
Let’s start development without wasting more time.
Styling:
index.css: (Common screen styling)
Code:
/* common styling */
.container {
background-color: black;
justify-content: center;
}
.container-sub {
display: flex;
width: 100%;
justify-content: center;
align-items: center;
flex-direction: column;
padding-top: 24px;
}
.container-location-loading {
flex-direction: column;
padding-top: 0px;
padding-bottom: 0px;
height: 456px;
width: 456px;
}
.column {
display: flex;
flex-direction: column;
justify-content: center;
width: 100%;
background-color: transparent;
}
.row {
display: flex;
flex-direction: row;
justify-content: space-between;
width: 80%;
height: 25px;
background-color: transparent;
}
.title {
text-align: center;
display: flex;
font-size: 16px;
}
.center {
text-align: center;
}
.location_loading {
object-fit: contain;
height: 456px;
width: 240px;
text-align: center;
align-items: center;
}
.current_time {
font-size: 18px;
text-align: center;
}
.mosque {
margin-top: 5px;
text-align: center;
fit-original-size: true;
}
.prayer_name {
text-align: center;
font-size: 16px;
margin-top: 2px;
margin-bottom: 5px;
}
.remaining_timer {
text-align: center;
font-size: 14px;
}
.button-circle {
background-color: transparent;
}
index.css: (Prayer BG & Color styling)
Code:
/* prayer BG & Color */
.prayer_bg {
background-position: top center;
background-size: 100% 280px;
}
.fajr_bg {
background-image: url('/common/images/prayer_bg/fajr.jpg');
}
.fajr_color {
background-color: #30170d;
}
.dhuhr_bg {
background-image: url('/common/images/prayer_bg/dhuhr.jpg');
}
.dhuhr_color {
background-color: #021823;
}
.asr_bg {
background-image: url('/common/images/prayer_bg/asr.jpg');
}
.asr_color {
background-color: #172B34;
}
.maghrib_bg {
background-image: url('/common/images/prayer_bg/maghrib.jpg');
}
.maghrib_color {
background-color: #010101;
}
.isha_bg {
background-image: url('/common/images/prayer_bg/isha.jpg');
}
.isha_color {
background-color: #082C44;
}
.night_bg {
background-image: url('/common/images/prayer_bg/night.jpg');
}
.night_color {
background-color: #131C39;
}
index.css: (Dialog styling)
Code:
/*Dialog styling*/
.dialog-main {
width: 100%;
}
.dialog-div {
display: flex;
flex-direction: column;
align-items: center;
}
.inner-txt {
width: 100%;
height: 300px;
flex-direction: column;
align-items: center;
}
.inner-btn {
width: 100%;
height: 154px;
align-items: center;
}
index.css: (List styling)
Code:
/*list styling*/
.list-wrapper {
width: 100%;
flex-direction: column;
}
.list-items {
width: 100%;
flex-direction: column;
padding: 0 24px;
}
.item-wrapper {
flex-direction: row;
justify-content: space-between;
align-items: center;
width: 100%;
height: 34px;
margin: 8px 0;
}
.item-icon-wrapper {
width: 24px;
}
.item-icon {
width: 24px;
height: 24px;
object-fit: contain;
}
.item-name-description-wrapper {
flex-direction: column;
justify-content: center;
align-items: center;
flex-grow: 1;
flex-shrink: 1;
width: 50%;
margin-right: 24px;
margin-left: 24px;
}
.item-name {
text-align: left;
color: #DBFFFFFF;
font-size: 16px;
}
.item-description {
text-align: left;
opacity: 0.75;
color: #99FFFFFF;
font-size: 14px;
}
.item-right-part-wrapper {
flex-direction: row;
justify-content: flex-end;
align-items: center;
}
.item-right-text {
margin-right: 4px;
margin-left: 8px;
font-size: 14px;
opacity: 0.75;
}
.item-right-arrow {
width: 12px;
height: 24px;
object-fit: contain;
}
.line {
stroke-width: 1px;
width: 100%;
background-color: #33FFFFFF;
margin-left: 40px;
}
index.css: (Birds animation styling)
Code:
/* Birds animation */
.birds_animation {
object-fit: scale-down;
position: absolute;
top: 0px;
left: -200px;
animation-name: Fly;
animation-duration: 15s;
animation-timing-function: ease;
animation-iteration-count: infinite;
}
@keyframes Fly {
from {
transform: translateX(-200px);
}
to {
transform: translateX(1000px);
}
}
Layout:
Index.hml: (Location Loading Animation)
Code:
<div if="{{ isLocationLoading === true }}" class="container-location-loading">
<image src="common/images/location_animation.gif" class="location_loading"/>
</div>
Index.hml: (Location Loading Output):
Index.hml: (Location Error & Retry)
Code:
<div class="column" if="{{ isLocationLoading === false && isLocationError === true }}">
<text class="title">Location not fetch, please try again later.</text>
</div>
Index.hml: (Prayer timer UI)
Code:
<div class="container-sub prayer_bg {{ prayer_bg }}" if="{{ isLocationLoading === false && isLocationError === false }}">
<image src="common/images/birds.gif" class="birds_animation"></image>
<text class="current_time">{{ currentTime }}</text>
<image class="mosque" src="common/images/mosque.png"></image>
<text class="prayer_name">{{nextPrayer}} {{nextPrayerTime}}</text>
<text if="{{isShowTargetTime}}" class="remaining_timer">{{nextPrayerRemaining}}</text>
<button type="circle" class="button-circle"
ontouchend="showPrayer" icon="common/images/down-arrow.png"></button>
</div>
Index.hml: (Prayer timer UI Output)
Index.hml: (Dialog all Prayer times)
Code:
<dialog id="simpledialog" class="dialog-main">
<div class="dialog-div {{ dialog_bg }}">
<button type="circle" class="button-circle"
ontouchend="closePrayer" icon="common/images/close.png"></button>
<div class="inner-txt">
<div class="prayers-list">
<div class="list-items-left">
<list class="list-wrapper" initialindex="{{ initial_index_value }}">
<block for="{{ prayer_data }}">
<list-item class="list-items" @click="changeList($idx)" id="{{ $idx }}">
<div class="item-wrapper">
<div class="item-icon-wrapper">
<image class="item-icon" src="{{ $item.item_icon }}"></image>
</div>
<div class="item-name-description-wrapper">
<text class="item-name">{{ $item.item_name }}</text>
<text class="item-description">{{ $item.item_description }}</text>
</div>
<div class="item-right-part-wrapper">
<image class="item-right-arrow" src="common/images/right_arrow_dark_mode.png"></image>
</div>
</div>
<div class="divider-line">
<divider class="line"></divider>
</div>
</list-item>
</block>
</list>
</div>
</div>
</div>
</div>
</dialog>
Index.hml: (Dialog all Prayer times Ouput)
Index.hml: (Complete code)
Code:
<div class="container {{ (isLocationLoading === false) ? 'column' : '' }}">
<div if="{{ isLocationLoading === true }}" class="container-location-loading">
<image src="common/images/location_animation.gif" class="location_loading"/>
</div>
<div class="column" if="{{ isLocationLoading === false && isLocationError === true }}">
<text class="title">Location not fetch, please try again later.</text>
</div>
<div class="container-sub prayer_bg {{ prayer_bg }}" if="{{ isLocationLoading === false && isLocationError === false }}">
<image src="common/images/birds.gif" class="birds_animation"></image>
<text class="current_time">{{ currentTime }}</text>
<image class="mosque" src="common/images/mosque.png"></image>
<text class="prayer_name">{{nextPrayer}} {{nextPrayerTime}}</text>
<text if="{{isShowTargetTime}}" class="remaining_timer">{{nextPrayerRemaining}}</text>
<button type="circle" class="button-circle"
ontouchend="showPrayer" icon="common/images/down-arrow.png"></button>
</div>
<dialog id="simpledialog" class="dialog-main">
<div class="dialog-div {{ dialog_bg }}">
<button type="circle" class="button-circle"
ontouchend="closePrayer" icon="common/images/close.png"></button>
<div class="inner-txt">
<div class="prayers-list">
<div class="list-items-left">
<list class="list-wrapper" initialindex="{{ initial_index_value }}">
<block for="{{ prayer_data }}">
<list-item class="list-items" @click="changeList($idx)" id="{{ $idx }}">
<div class="item-wrapper">
<div class="item-icon-wrapper">
<image class="item-icon" src="{{ $item.item_icon }}"></image>
</div>
<div class="item-name-description-wrapper">
<text class="item-name">{{ $item.item_name }}</text>
<text class="item-description">{{ $item.item_description }}</text>
</div>
<div class="item-right-part-wrapper">
<image class="item-right-arrow" src="common/images/right_arrow_dark_mode.png"></image>
</div>
</div>
<div class="divider-line">
<divider class="line"></divider>
</div>
</list-item>
</block>
</list>
</div>
</div>
</div>
</div>
</dialog>
</div>
JS code:
index.js: (Structural - Code)
Code:
import geolocation from '@system.geolocation';
import adhan from 'adhan';
import moment from 'moment';
import tz from 'moment-timezone';
var tzlookup = require("tz-lookup");
const TAG = 'app_log [index]';
export default {}
index.js: (Data - Code)
Code:
data: {
config: {
isTesting: true,
locationCoordinates: {
"latitude": 24.65382908421087,
"longitude": 46.73552629355017
},
timeZone: "Asia/Riyadh",
fakeDateTime: "2021-06-12 18:13:01"
},
prayer_data: [
{
item_id: "fajr",
item_icon: "common/images/prayer_icon/fajr.png",
item_name: 'Fajr',
item_description: ''
},
{
item_id: "dhuhr",
item_icon: "common/images/prayer_icon/dhuhr.png",
item_name: 'Dhuhr',
item_description: ''
},
{
item_id: "asr",
item_icon: "common/images/prayer_icon/asr.png",
item_name: 'Asr',
item_description: ''
},
{
item_id: "maghrib",
item_icon: "common/images/prayer_icon/maghrib.png",
item_name: 'Maghrib',
item_description: ''
},
{
item_id: "isha",
item_icon: "common/images/prayer_icon/isha.png",
item_name: 'Isha',
item_description: ''
},
],
defaultPrayerSetting: {
allowNotification: false,
prayerSetting: {
Madhab: 'Shafi',
calculationMethod: 'UmmAlQura',
adjustments: {
fajr: "0",
sunrise: "0",
dhuhr: "0",
asr: "0",
maghrib: "0",
isha: "0"
}
}
},
initial_index_value: 2,
isLocationError: false,
isLocationLoading: true,
locationCoordinates: null,
currentTime: null,
timeUpdateTimer: null,
nextPrayer: 'Night',
nextPrayerTime: '',
nextPrayerRemaining: '',
isShowTargetTime: true,
date: moment().toDate(),
prayer_bg: "night_bg",
dialog_bg: "night_color"
},
index.js: (Common - Code)
Code:
onInit() {
console.log(TAG + 'onInit');
if(this.config.isTesting === true){
this.locationCoordinates = this.config.locationCoordinates
moment.tz.setDefault(this.config.timeZone);
this.date = moment(this.config.fakeDateTime).toDate();
}
this.currentTime = moment(this.date).format('ddd LT');
this.timeUpdateTimer = setInterval(this.updateTimer, 2000);
},
onReady() {
console.log(TAG + 'onReady');
var _this = this;
if (this.locationCoordinates !== null) {
setTimeout(() => {
_this.calculatePrayerTime();
_this.isLocationLoading = false;
_this.isLocationError = false;
}, 4000);
} else {
this.locationLoading().then(result => {
_this.locationCoordinates = result;
console.info(TAG + "Location: " + result);
_this.calculatePrayerTime();
_this.isLocationLoading = false;
_this.isLocationError = false;
}, error => {
console.info(TAG + "Location: error ->" + error);
_this.isLocationLoading = false;
_this.isLocationError = true;
});
}
},
onShow() {
console.log(TAG + 'onShow');
},
onDestroy() {
console.log(TAG + 'onDestroy');
clearInterval(this.timeUpdateTimer);
this.timeUpdateTimer = null;
clearInterval(this.countDownTimer);
this.countDownTimer = null;
},
updateTimer() {
this.currentTime = moment().format('ddd LT');
if(this.config.isTesting === true){
this.currentTime = moment(this.config.fakeDateTime).format('ddd LT');
}
},
index.js: (Dialog - Code)
Code:
showPrayer(e) {
this.$element('simpledialog').show();
},
closePrayer(e) {
this.$element('simpledialog').close();
},
index.js: (Location Fetching - Code)
Code:
locationLoading() {
return new Promise(function (resolve, reject) {
return geolocation.getLocation({
success: function (data) {
console.log('success get location data. latitude:' + data.latitude + 'long:' + data.longitude);
return resolve({
latitude: data.latitude,
longitude: data.longitude
});
},
fail: function (data, code) {
console.log('fail to get location. code:' + code + ', data:' + data);
return reject({
error: 'fail to get location. code:' + code + ', data:' + data
});
},
});
});
},
index.js: (Prayer times - Code)
Code:
calculatePrayerTime() {
var _this = this;
var prayerSettings = this.defaultPrayerSetting;
console.log(TAG + 'prayer_setting: getPrayerSetting() ' + JSON.stringify(prayerSettings));
if (prayerSettings !== null) {
this.prayerSettings = prayerSettings;
var params = this.getPrayerParameter(this.prayerSettings);
var coordinates = new adhan.Coordinates(_this.locationCoordinates.latitude, _this.locationCoordinates.longitude);
var date = this.date;
var prayerTimes = new adhan.PrayerTimes(coordinates, date, params);
console.info(TAG + 'locationCoordinates ' + JSON.stringify(_this.locationCoordinates));
var timezone = tzlookup(_this.locationCoordinates.latitude, _this.locationCoordinates.longitude)
if(this.config.isTesting === true){
timezone = this.config.timeZone
}
console.log(TAG + "timezone: " + timezone);
var nextPrayer = prayerTimes.nextPrayer(date);
var currentPrayer = prayerTimes.currentPrayer(date);
console.info(TAG + 'nextPrayer ' + nextPrayer);
console.info(TAG + 'currentPrayer ' + currentPrayer);
if (nextPrayer.toString() === "none") {
_this.isShowTargetTime = false
_this.nextPrayer = "Night";
_this.managePrayerTime(prayerTimes, timezone, nextPrayer, currentPrayer)
} else {
_this.isShowTargetTime = true
_this.nextPrayer = nextPrayer;
var nextPrayerTime = prayerTimes.timeForPrayer(nextPrayer);
_this.nextPrayerTime = moment(nextPrayerTime).tz(timezone).format('h:mm A');
_this.setTimeInfo(nextPrayerTime.getTime());
_this.managePrayerTime(prayerTimes, timezone, nextPrayer, currentPrayer)
}
}
},
managePrayerTime(prayerTimes, timezone, nextPrayer, currentPrayer) {
var _this = this;
var fajrTime = moment(prayerTimes.fajr).tz(timezone).format('h:mm A');
var sunriseTime = moment(prayerTimes.sunrise).tz(timezone).format('h:mm A');
var dhuhrTime = moment(prayerTimes.dhuhr).tz(timezone).format('h:mm A');
var asrTime = moment(prayerTimes.asr).tz(timezone).format('h:mm A');
var maghribTime = moment(prayerTimes.maghrib).tz(timezone).format('h:mm A');
var ishaTime = moment(prayerTimes.isha).tz(timezone).format('h:mm A');
_this.prayer_data.map(item => {
if (item.item_id === "fajr") {
item.item_description = fajrTime;
}
if (item.item_id === "dhuhr") {
item.item_description = dhuhrTime;
}
if (item.item_id === "asr") {
item.item_description = asrTime;
}
if (item.item_id === "maghrib") {
item.item_description = maghribTime;
}
if (item.item_id === "isha") {
item.item_description = ishaTime;
}
if (nextPrayer.toString().toLowerCase() === item.item_id) {
_this.prayer_bg = item.item_id + "_bg";
_this.dialog_bg = item.item_id + "_color";
}
});
},
getPrayerParameter(prayerSettings) {
var params = adhan.CalculationMethod.UmmAlQura();
var prayerSetting = prayerSettings.prayerSetting;
if (prayerSetting.calculationMethod === 'MuslimWorldLeagueMuslimWorldLeague') {
params = adhan.CalculationMethod.MuslimWorldLeague();
} else if (prayerSetting.calculationMethod === 'Egyptian') {
params = adhan.CalculationMethod.Egyptian();
} else if (prayerSetting.calculationMethod === 'Karachi') {
params = adhan.CalculationMethod.Karachi();
} else if (prayerSetting.calculationMethod === 'Dubai') {
params = adhan.CalculationMethod.Dubai();
} else if (prayerSetting.calculationMethod === 'MoonsightingCommittee') {
params = adhan.CalculationMethod.MoonsightingCommittee();
} else if (prayerSetting.calculationMethod === 'NorthAmerica') {
params = adhan.CalculationMethod.NorthAmerica();
} else if (prayerSetting.calculationMethod === 'Kuwait') {
params = adhan.CalculationMethod.Kuwait();
} else if (prayerSetting.calculationMethod === 'Qatar') {
params = adhan.CalculationMethod.Qatar();
} else if (prayerSetting.calculationMethod === 'Singapore') {
params = adhan.CalculationMethod.Singapore();
} else if (prayerSetting.calculationMethod === 'Other') {
params = adhan.CalculationMethod.Other();
}
if (prayerSetting.Madhab === 'Shafi') {
params.madhab = adhan.Madhab.Shafi;
} else {
params.madhab = adhan.Madhab.Hanafi;
}
params.adjustments.fajr = parseInt(prayerSetting.adjustments.fajr) || 0;
params.adjustments.sunrise = parseInt(prayerSetting.adjustments.sunrise) || 0;
params.adjustments.dhuhr = parseInt(prayerSetting.adjustments.dhuhr) || 0;
params.adjustments.asr = parseInt(prayerSetting.adjustments.asr) || 0;
params.adjustments.maghrib = parseInt(prayerSetting.adjustments.maghrib) || 0;
params.adjustments.isha = parseInt(prayerSetting.adjustments.isha) || 0;
return params;
},
index.js: (Count down timer - Code)
Code:
setTimeInfo(next_time) {
console.log(TAG + "next_time: " + next_time);
this.CaculateTime(next_time);
this.countDownTimer = setInterval(() => {
this.CaculateTime(next_time);
}, 1000);
},
CaculateTime(timeObj) {
var myDate = new Date();
if (this.config.isTesting === true) {
this.date = moment(this.date).add(500, 'milliseconds').toDate();
myDate = this.date;
}
let currentTime = myDate.getTime();
var targetTime = parseInt(timeObj);
var remainTime = parseInt(targetTime - currentTime);
if (remainTime > 0) {
this.isShowTargetTime = true;
this.setRemainTime(remainTime);
//this.setTargetTime(targetTime);
}
},
setRemainTime(remainTime) {
let days = this.addZero(Math.floor(remainTime / (24 * 3600 * 1000))); // Calculate the number of days
let leavel = remainTime % (24 * 3600 * 1000); // Time remaining after counting days
let hours = this.addZero(Math.floor(leavel / (3600 * 1000))); // Calculate the number of hours remaining
let leavel2 = leavel % (3600 * 1000); // Number of milliseconds remaining after calculating the remaining hours
let minutes = this.addZero(Math.floor(leavel2 / (60 * 1000))); // Calculate the number of minutes remaining
// Calculate the difference seconds.
let leavel3 = leavel2 % (60 * 1000); // Number of milliseconds remaining after minutes are calculated
let seconds = this.addZero(Math.round(leavel3 / 1000));
this.nextPrayerRemaining = hours + ':' + minutes + ':' + seconds;
},
setTargetTime(targetTime) {
var _this = this
var times = new Date(targetTime);
let date = times.toLocaleDateString(); //Gets the current date
var tempSetHours = times.getHours(); //Gets the current number of hours (0 - 23)
let hours = this.addZero(tempSetHours)
var tempSetMinutes = times.getMinutes(); //Gets the current number of minutes (0 - 59)
let minutes = this.addZero(tempSetMinutes)
var tempSetSeconds = times.getSeconds(); //Gets the current number of seconds (0 - 59)
let seconds = this.addZero(tempSetSeconds)
this.targetTime = `${hours}:${minutes}:${seconds}`;
},
addZero: function (i) {
return i < 10 ? "0" + i : i + "";
},
Prayer time Screen Notes:
To manage different state of application on single screen, we can able to use logic layouts using if=”true/false” or show=”true/false” conditions on containers.
For testing of custom date and time developer need to modify config data variable (isTesting: true).
For production we need to apply isTesting: false and relay on real date and time.
For prayer time parameter we implement adhan npm libraries, developer can have access on prayer time adjustment (plus/minus) in minutes.
For better management of prayer time parameters always use local storage (key/value), to save user preferences in storage and adjust prayer time.
5. Result
Tips & Tricks:
HarmonyOS JS project while installing any NPM libraries, in terminal must be on entry folder of your project module.
For testing of any date and time, developer need to modify config data variable (isTesting: true)
For production or realtime device, developer need to modify config data variable (isTesting: false)
For prayer time adjustment developer can modify defaultPrayerSetting data variable and could store user preference in storage.
Requesting some data from internet, you must need to add Internet permission in config.json file.
Fetching Location data, you must need to add Internet Permission in config.json file.
Use Dev Eco Studio Previewer to check the screen layout and design. Previewer is developer friendly to Hot release changes on fly.
For better management of big application it’s a good practice to centralize you common scripts and common style in common folder. Add images folder for complete application images.
In JS script when you make some variable, in callback functions you can store the reference of this to some variable and then call reference variable. Like var _this = this.
References:
HarmonyOS JS API Official Documentation: https://developer.harmonyos.com/en/docs/documentation/doc-references/js-apis-overview-0000001056361791
Geographic Location Documentation: https://developer.harmonyos.com/en/docs/documentation/doc-references/js-apis-system-location-0000000000626089
Conclusion:
Developers can able to develop real world Prayer time calculation application, while fetch user location data and using npm ready-made libraries. While developing application for HarmonyOS developer can get benefit for both JS and JAVA language. Benefit for developing JS based HarmonyOS application developer can able to use npm based libraries and can reduce development time.
Original Source
Useful sharing, thanks!!
Very useful. Thanks for sharing