[Huawei Developers] HMS Community:
Introduction

In this article, we will be integrating Huawei Account, Push kit and Analytics kit in Flutter DietApp. Here we can see on filling form diet plan i.e. what kind of food you can have to gain/loose the weight with images, we can see in the diet screen with paid diet plan. Flutter plugin provides simple and convenient way to experience authorization of users. Flutter Account Plugin allows users to connect to the Huawei ecosystem using their Huawei IDs from the different devices such as mobiles phones and tablets, added users can login quickly and conveniently sign in to apps with their Huawei IDs after granting initial access permission.

Huawei Push kit is a messaging service provided for you. It establishes a messaging channel from the cloud to devices. By integrating Push Kit, you can send messages to your apps on user’s devices in real time. This helps you to maintain closer ties with users and increases user awareness and engagement with your apps.

Huawei Analytics is a one-stop solution to get user behavior analysis in different platforms for all yours products such as mobile apps, web apps and quick apps. It helps developers to get detailed analysis report and also provides crash reports by default. It offers scenario-specific data collection, management, analysis, and usage, helping enterprises to achieve effective user acquisition, product optimization, precise operations, and business growth.

We will also learn to integrate Huawei Crash Service in this application. It is a responsibility of the developer to build crash free i.e. unexpected exit of application, it is very difficult to find the cause of the crash in huge application code base. This unexpected crash makes app users annoying and may lead to business loss and reduce market value of the product and the company. To avoid such crashes Huawei provides Crash service which makes developer to find the crash and cause of unexpected exit of the application in AG-console. Crash SDK provides very simple and developer need not code much to implementation crash service. You can also download the detailed crash report whenever required.

Previous article

Please check my previous articles, if you have not gone through, click on part-3.

Development Overview

You 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.

Android 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 process

Step 1: Create Flutter project.

Step 2: Add the App level gradle dependencies. Choose inside project Android > app > build.gradle.

apply plugin: 'com.android.application'

apply plugin: 'com.huawei.agconnect'

Root level gradle dependencies

maven {url 'https://developer.huawei.com/repo/'}

classpath 'com.huawei.agconnect:agcp:1.5.2.300'

Step 3: Add the below permissions in Android Manifest file.

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

Step 4: Download flutter push kit plugins

Step 5: Add downloaded file into parent directory of the project. Declare plugin path in pubspec.yaml file under dependencies.

Add path location for asset image.

Lets start coding

SplashScreen.dart

[/B]
class SplashScreen extends StatefulWidget {
@override
_SplashScreenState createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen> {
@override
void initState() {
super.initState();
Timer(
Duration(seconds: 3),
() => Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) => const LoginScreen())));
}

@override
Widget build(BuildContext context) {
return Container(
color: Colors.white, child: Image.asset('images/logo_huawei.png'));
}
}

[B]

loginScreen.dart

[/B][/B]
class LoginScreen extends StatelessWidget {
const LoginScreen({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: LoginDemo(),
);
}
}

class LoginDemo extends StatefulWidget {
@override
_LoginDemoState createState() => _LoginDemoState();
}

class _LoginDemoState extends State<LoginDemo> {
final HMSAnalytics _hmsAnalytics = new HMSAnalytics();
@override
void initState() {
_enableLog();
super.initState();
}

Future<void> _enableLog() async {
_hmsAnalytics.setUserId("TestUserDietApp");
await _hmsAnalytics.enableLog();
}

@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
title: Text("Login"),
backgroundColor: Colors.blue,
),
body: RefreshIndicator(
onRefresh: showToast,
child: SingleChildScrollView(
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 90.0),
child: Center(
child: Container(
width: 320,
height: 220,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(50.0)),
child: Image.asset('images/logo_huawei.png')),
),
),
Padding(
padding: EdgeInsets.only(
left: 40.0, right: 40.0, top: 15, bottom: 0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Email',
hintText: 'Enter valid email id '),
),
),
Padding(
padding: const EdgeInsets.only(
left: 40.0, right: 40.0, top: 10, bottom: 0),
child: TextField(
obscureText: true,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Password',
hintText: 'Enter password'),
),
),
FlatButton(
onPressed: () {
//TODO FORGOT PASSWORD SCREEN GOES HERE
},
child: Text(
'Forgot Password',
style: TextStyle(color: Colors.blue, fontSize: 15),
),
),
Container(
height: 50,
width: 270,
decoration: BoxDecoration(
color: Colors.red, borderRadius: BorderRadius.circular(20)),
child: FlatButton(
onPressed: () async {
try {
try {
final bool result = await AccountAuthService.signOut();
if (result) {
final bool response =
await AccountAuthService.cancelAuthorization();
}
} on Exception catch (e) {
print(e.toString());
}
} on Exception catch (e) {
print(e.toString());
}
},
child: GestureDetector(
onTap: () async {
try {
final bool response =
await AccountAuthService.cancelAuthorization();
} on Exception catch (e) {
print(e.toString());
}
},
child: Text(
'Login',
style: TextStyle(color: Colors.white, fontSize: 22),
),
),
),
),
SizedBox(
height: 20,
),
Container(
height: 50,
width: 270,
decoration:
BoxDecoration(borderRadius: BorderRadius.circular(5)),
child: HuaweiIdAuthButton(
theme: AuthButtonTheme.FULL_TITLE,
buttonColor: AuthButtonBackground.RED,
borderRadius: AuthButtonRadius.MEDIUM,
onPressed: () {
signInWithHuaweiID();
}),
),
SizedBox(
height: 30,
),
GestureDetector(
onTap: () {
//showBannerAd();
},
child: Text('New User? Create Account'),
),
],
),
),
),
);
}

void signInWithHuaweiID() async {
AccountAuthParamsHelper helper = new AccountAuthParamsHelper();
String name = '';
helper.setAuthorizationCode();
try {
// The sign-in is successful, and the user's ID information and authorization code are obtained.

Future<AuthAccount> account = AccountAuthService.signIn();
account.then(
(value) => Navigator.push(
context,
MaterialPageRoute(
builder: (_) => MyHomePage(
title: value.displayName.toString(),
),
),
),
);
} on Exception catch (e) {
print(e.toString());
}
}

Future<void> showToast() async {
Fluttertoast.showToast(
msg: "Refreshing.. ",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.lightBlue,
textColor: Colors.white,
fontSize: 16.0);
}
}

[B][B]

main.dart

[/B][/B][/B]
void main() {
runApp(MyApp());
}

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Exercise&DietApp',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: SplashScreen(),
);
}
}

class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);

final String title;

@override
State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
late double? age, height, weight, tagetWeight, days;
TextEditingController ageController = TextEditingController();
TextEditingController genderController = TextEditingController();
TextEditingController heightController = TextEditingController();
TextEditingController weightController = TextEditingController();
TextEditingController targetWeightController = TextEditingController();
TextEditingController inDaysWeightController = TextEditingController();
TextEditingController dietPlanController = TextEditingController();
TextEditingController activeLevelPlanController = TextEditingController();
late SharedPreferences prefs;

String _genderLabel = "Male";
String _dietLabel = "Veg";
String _activeLable = "Low-Active";
final _genderList = ["Male", "Women"];
final _dietPlanList = ["Veg", "Non Veg", "Egg"];
final _activeLevelList = ["Low-Active", "Mid-Active", "Very Active"];
String _token = '';

void initState() {
initPreferences();
initTokenStream();
super.initState();
}

Future<void> initTokenStream() async {
if (!mounted) return;
Push.getTokenStream.listen(_onTokenEvent, onError: _onTokenError);

getToken();
}

void getToken() async {
// Call this method to request for a token
Push.getToken("");
}

void _onTokenEvent(String event) {
// Requested tokens can be obtained here
setState(() {
_token = event;
print("TokenEvent: " + _token);
});
}

void _onTokenError(Object error) {
print("TokenErrorEvent: " + error.toString());
PlatformException? e = error as PlatformException?;
}

@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
resizeToAvoidBottomInset: true,
appBar: AppBar(
title: Text(widget.title.toString()),
automaticallyImplyLeading: false,
),
body: Center(
child: SingleChildScrollView(
reverse: true,
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 0.0),
child: Center(
child: Container(
width: 120,
height: 120,
decoration: BoxDecoration(
color: Colors.black,
borderRadius: BorderRadius.circular(60.0)),
child: Image.asset('images/nu_icon.png')),
),
),
Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 15, bottom: 0),
child: TextField(
controller: ageController,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Age',
hintText: 'Enter valid age '),
),
),

Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 15, bottom: 0),
child: TextField(
controller: heightController,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Height',
hintText: 'Enter height '),
),
),
Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 15, bottom: 0),
child: TextField(
controller: weightController,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Weight',
hintText: 'Enter Weight '),
),
),
Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 15, bottom: 0),
child: TextField(
controller: targetWeightController,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Target Weight',
hintText: 'Enter target Weight '),
),
),
Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 15, bottom: 0),
child: TextField(
controller: inDaysWeightController,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'In days',
hintText: 'How quickly you want loose/gain weight '),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
const Text('Gender :'),
DropdownButton(
items: _genderList
.map((String item) => DropdownMenuItem<String>(
child: SizedBox(
height: 22,
width: 100,
child: Text(item,
style: TextStyle(fontSize: 20))),
value: item))
.toList(),
onChanged: (value) {
setState(() {
_genderLabel = value.toString();
});
},
value: _genderLabel,
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('Diet Plan :'),
DropdownButton(
items: _dietPlanList
.map((String item) => DropdownMenuItem<String>(
child: SizedBox(
height: 22,
width: 100,
child: Text(item,
style: TextStyle(fontSize: 20))),
value: item))
.toList(),
onChanged: (value) {
setState(() {
_dietLabel = value.toString();

print('Diet plan changed to $value');
});
},
value: _dietLabel,
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('Active Level :'),
DropdownButton(
items: _activeLevelList
.map((String item) => DropdownMenuItem<String>(
child: SizedBox(
height: 22,
width: 100,
child: Text(item,
style: TextStyle(fontSize: 20))),
value: item))
.toList(),
onChanged: (value) {
setState(() {
_activeLable = value.toString();
print('Active level changed to $value');
});
},
value: _activeLable,
)
],
)
,
Padding(
padding: const EdgeInsets.only(
left: 22.0, right: 22.0, top: 20, bottom: 0),
child: MaterialButton(
child: const Text(
'Next',
style: TextStyle(
fontSize: 22,
color: Colors.white,
fontWeight: FontWeight.w300),
),
height: 45,
minWidth: 140,
color: Colors.lightBlue,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
onPressed: () {
print('Button clicked.....');
age = double.parse(ageController.text);
height = double.parse(heightController.text);
weight = double.parse(weightController.text);
tagetWeight = double.parse(targetWeightController.text);
days = double.parse(inDaysWeightController.text);

storeDataLocally();
},
),
),
],
),
),
),
),
);
}

Future<void> storeDataLocally() async {
prefs.setString("name", widget.title.toString());
prefs.setDouble("age", age!);
prefs.setDouble("height", height!);
prefs.setString("gender", _genderLabel);
prefs.setDouble("weight", weight!);
prefs.setString("dietPlan", _dietLabel);
prefs.setDouble("targetWeight", tagetWeight!);
prefs.setString("activeLevel", _activeLable);
prefs.setDouble("inDays", days!);

Navigator.push(
context,
MaterialPageRoute(builder: (context) => const DietPlanScreen()),
);
}

Future<void> initPreferences() async {
prefs = await SharedPreferences.getInstance();
showData();
}

void showData() {
print("Gender ===>" + prefs.getString('gender').toString());
print("Diet Plan ===>" + prefs.getString('dietPlan').toString());
print("Active Level ===>" + prefs.getString('activeLevel').toString());
if (prefs.getDouble('age')! > 10) {
ageController.text = prefs.getDouble('age').toString();
heightController.text = prefs.getDouble('height').toString();
targetWeightController.text = prefs.getDouble('targetWeight').toString();
genderController.text = prefs.getString('gender').toString();
dietPlanController.text = prefs.getString('dietPlan').toString();
weightController.text = prefs.getDouble('weight').toString();
inDaysWeightController.text = prefs.getDouble('inDays').toString();
activeLevelPlanController.text =
prefs.getString('activeLevel').toString();
if (prefs.getString('gender').toString() != null &&
prefs.getString('gender').toString() != '') {
_genderLabel = prefs.getString('gender').toString();
}
if (prefs.getString('dietPlan').toString() != null) {
_dietLabel = prefs.getString('dietPlan').toString();
}
if (prefs.getString('activeLevel').toString() != null) {
_activeLable = prefs.getString('activeLevel').toString();
}
}
}
}

[B][B][B]

paidPlanScreen.dart

[/B][/B][/B][/B]
class PaidPlanScreen extends StatelessWidget {
String plan = '';
PaidPlanScreen(this.plan, {Key? key}) : super(key: key);

// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: '$plan',
home: MyHomePage(
title: '$plan',
),
);
}
}

class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);

final String title;

@override
State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
late SharedPreferences prefs;

String dietPlan = '', wt_lg = '';
double wt = 0;

bool isGain = false;

void initState() {
initPreference();
super.initState();
}

@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(
title: Text(widget.title.toString()),
backgroundColor: Colors.blue,
automaticallyImplyLeading: false,
centerTitle: true,
),
body: SingleChildScrollView(
child: Card(
color: Colors.white,
child: Center(
child: Padding(
padding: EdgeInsets.all(15),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Card(
elevation: 3,
shape: Border(
right: BorderSide(color: Colors.red, width: 5)),
child: Padding(
padding: EdgeInsets.all(20),
child: Text(
dietPlan,
style: const TextStyle(
fontSize: 19, color: Colors.deepOrange),
),
),
),
Card(
elevation: 3,
shape: Border(
right:
BorderSide(color: Colors.greenAccent, width: 5)),
child: Padding(
padding: EdgeInsets.all(5),
child: ExpansionTile(
title: Text('Week 1',
style:
TextStyle(fontSize: 22, color: Colors.teal)),
children: <Widget>[
ListTile(
title: getTile('Day 1'),
),
Padding(
padding: EdgeInsets.all(15),
child: Image.asset('images/day1.png'),
),
Text(
'Breakfast: 1 serving Avocado-Egg Toast (271 calories)'
'A.M. Snack: 1 medium orange (62 calories)'
'Lunch: 1 serving Butternut Squash Soup with Avocado & Chickpeas (402 calories)'
'P.M. Snack: 1 medium kiwi (42 calories)'
'Dinner: 1 serving Citrus Poached Salmon with Asparagus with 3/4 cup Cauliflower Rice (451 calories)'
'Daily Totals: 1,228 calories, 58 g protein, 126 g carbohydrates, 30 g fiber, 59 g fat, 1,709 mg sodium.'
'',
style:
TextStyle(color: Colors.green, fontSize: 20),
),
ListTile(
title: Column(
children: <Widget>[
ListTile(
title: getTile('Day 2'),
),
Padding(
padding: EdgeInsets.all(15),
child: Image.asset('images/day2.png'),
),
Text(
'Breakfast: 1 serving Blueberry-Banana Overnight Oats (285 calories)'
'A.M. Snack: 1 serving Apple Cider Vinegar Tonic (22 calories)'
'Lunch: 1 1/2 cups Slow-Cooker Vegetable Soup with 1 slice Everything Bagel Avocado Toast (347 calories)'
'P.M. Snack: 1/2 cup edamame (in pods) sprinkled with a pinch of coarse sea salt (100 calories)'
'Dinner: 1 serving Vegan Coconut Chickpea Curry (471 calories)'
'Meal-Prep Tip: Prepare the Blueberry-Banana Overnight Oats so its ready to grab-and-go in the morning of Day 3.'
'Daily Totals: 1,225 calories, 41 g protein, 181 g carbohydrates, 36 g fiber, 41 g fat, 1,842 mg sodium.',
style: TextStyle(
color: Colors.green, fontSize: 20),
),
/* Image.asset('images/day3.jpg'),
ListTile(
title: getTile('Day 3 '),
),
Image.asset('images/eggfat.jpeg'),
ListTile(
title: getTile('Dried fruits'),
),
Image.asset('images/dryfruit.jpg'),*/
],
),
),
],
),
),
),
Card(
elevation: 3,
shape: Border(
right:
BorderSide(color: Colors.greenAccent, width: 5)),
child: Padding(
padding: EdgeInsets.all(5),
child: ExpansionTile(
title: Text('Week 2',
style:
TextStyle(fontSize: 22, color: Colors.teal)),
children: <Widget>[
ListTile(
title: getTile('Day 1'),
),
Padding(
padding: EdgeInsets.all(15),
child: Image.asset('images/day1.png'),
),
Text(
'Breakfast: 1 serving Avocado-Egg Toast (271 calories)'
'A.M. Snack: 1 medium orange (62 calories)'
'Lunch: 1 serving Butternut Squash Soup with Avocado & Chickpeas (402 calories)'
'P.M. Snack: 1 medium kiwi (42 calories)'
'Dinner: 1 serving Citrus Poached Salmon with Asparagus with 3/4 cup Cauliflower Rice (451 calories)'
'Daily Totals: 1,228 calories, 58 g protein, 126 g carbohydrates, 30 g fiber, 59 g fat, 1,709 mg sodium.'
'',
style:
TextStyle(color: Colors.green, fontSize: 20),
),
ListTile(
title: Column(
children: <Widget>[
ListTile(
title: getTile('Day 2'),
),
Padding(
padding: EdgeInsets.all(15),
child: Image.asset('images/day2.png'),
),
Text(
'Breakfast: 1 serving Blueberry-Banana Overnight Oats (285 calories)'
'A.M. Snack: 1 serving Apple Cider Vinegar Tonic (22 calories)'
'Lunch: 1 1/2 cups Slow-Cooker Vegetable Soup with 1 slice Everything Bagel Avocado Toast (347 calories)'
'P.M. Snack: 1/2 cup edamame (in pods) sprinkled with a pinch of coarse sea salt (100 calories)'
'Dinner: 1 serving Vegan Coconut Chickpea Curry (471 calories)'
'Meal-Prep Tip: Prepare the Blueberry-Banana Overnight Oats so its ready to grab-and-go in the morning of Day 3.'
'Daily Totals: 1,225 calories, 41 g protein, 181 g carbohydrates, 36 g fiber, 41 g fat, 1,842 mg sodium.',
style: TextStyle(
color: Colors.green, fontSize: 20),
),
/* Image.asset('images/day3.jpg'),
ListTile(
title: getTile('Day 3 '),
),
Image.asset('images/eggfat.jpeg'),
ListTile(
title: getTile('Dried fruits'),
),
Image.asset('images/dryfruit.jpg'),*/
],
),
),
],
),
),
),
],
),
),
),
),
),
),
);
}

void getPlan() {
double? days = prefs.getDouble('inDays');
double? tagetWeight = prefs.getDouble('targetWeight');
double? weight = prefs.getDouble('weight');
print('Target $tagetWeight');
print('weight $weight');

setState(() {
if (tagetWeight! > weight!) {
setState(() {
isGain = true;
});
wt_lg = 'gain';
wt = tagetWeight - weight;
dietPlan = 'Aim is to $wt_lg $wt kg weight in $days days.';
} else {
setState(() {
isGain = false;
});

wt_lg = 'loose';
wt = weight - tagetWeight;
dietPlan = 'Aim is to $wt_lg $wt kg weight in $days days.';
}
});
}

Future<void> initPreference() async {
prefs = await SharedPreferences.getInstance();
getPlan();
}

RichText getTile(String item) {
return RichText(
text: TextSpan(
text: '• ',
style: TextStyle(
color: Colors.lightBlue,
),
children: <TextSpan>[
TextSpan(text: '$item', style: TextStyle(fontSize: 18)),
],
),
);
}
}

[B][B][B][B]

How do I report a crash?

[/B][/B][/B][/B]
void crashTest() {
CrashService.enableCollection();
AGCCrash.instance.setUserId("TestDietApp");
AGCCrash.instance.setCustomKey("Test",
"This is test crash for crash service while login button click.");
AGCCrash.instance.setCustomKey("LoginCLickTestCrash", "Crash Test");
AGCCrash.instance.testIt();
}
[B][B][B][B]

Result

Tricks and Tips

Make sure that downloaded plugin is unzipped in parent directory of project.

Makes sure that agconnect-services.json file added.

Make sure dependencies are added yaml file.

Run flutter pug get after adding dependencies.

Make sure that service is enabled in agc.

Makes sure images are defined in yaml file.

Conclusion

In this article, we have learnt how to integrate Huawei Account kit, Push kit and Crash kit in Flutter DietApp. Once Account kit integrated, users can login quickly and conveniently sign in to apps with their Huawei IDs after granting initial access permission. Push kit enables you to send push notification to user device in real time, you can see the push notification in the result part. Huawei Crash service which provides developers to quickly detect, locate and fix the crash or unexpected exit of application. Hence improves stability and reliability of application.

Thank you so much for reading. I hope this article helps you to understand the integration of Huawei Account kit, Push kit and Crash kit in flutter DietApp.

Reference

Crash Kit

Account Kit – Training Video

Push Kit – Training Video

Crash Kit – Training Video

Checkout in forum