biometric

Description:

biometric

biometric #
A new flutter plugin project.
Flutter Plugin for biometric authentication (android)
Supported

Android

Example #
main.dart
import 'package:biometric_example/login.dart';
import 'package:biometric_example/page.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

@override
Widget build(BuildContext context) {
return MaterialApp(
routes: <String, WidgetBuilder> {
'/page': (BuildContext context) => new Page(),
},
home: Login(),
);
}
}
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login.dart
import 'package:flutter/material.dart';

import 'package:biometric/biometric.dart';
import 'package:flutter/services.dart';

class Login extends StatefulWidget {
@override
_LoginState createState() => _LoginState();
}

class _LoginState extends State<Login> {

final _formKey = GlobalKey<FormState>();

final _emailController = TextEditingController();
final _passController = TextEditingController();

final Biometric biometric = Biometric();
String _hintPass = "Password";
String _errorMessage = "";

@override
void initState() {
super.initState();

Future.delayed(Duration.zero, () {
_initializeBiometric();
});
}

Future<void> _initializeBiometric() async {

String errorMessage = "";
String erroCode = "";
bool authStatus = false;
bool authAvailable;

try {
authAvailable = await biometric.biometricAvailable();
} on PlatformException catch (e) {
print(e);
}

if (authAvailable) {

setState(() {
_hintPass = "Password or Biometric";
});

try {
authStatus = await biometric.biometricAuthenticate(keepAlive: true);
} on PlatformException catch (e) {
errorMessage = e.message.toString();
errorCode = e.message.toString();
}
if (!mounted) return;

if ( authStatus ) {
Navigator.of(context).pushReplacementNamed("/page");
} else {

if ( errorCode != "BIO-CANCEL" && errorCode != "BIO-PROGRESS") {
setState(() {
_errorMessage = errorMessage;
_initializeBiometric();
});
}
}

}

}

Future<void> _cancelAuthenticate() async {
try {
await biometric.biometricCancel();
} on PlatformException catch (e) {
print(e.toString());
}
}


@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Biometric Pluggin'),
centerTitle: true,
backgroundColor: Colors.red,
),
body: Container(
color: Colors.white,
child: Form(
key: _formKey,
child: ListView(
padding: EdgeInsets.all(16.0),
children: <Widget>[
SizedBox(height: 16.0,),
Text("Login", style: TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold), textAlign: TextAlign.center,),

SizedBox(height: 16.0,),
TextFormField(
controller: _emailController,
decoration: InputDecoration(
hintText: "Email",
),
maxLength: 14,
keyboardType: TextInputType.emailAddress,
validator: (text) {
if(text.isEmpty)
return "Email is required";
},
),

SizedBox(height: 16.0,),
TextFormField(
controller: _passController,
decoration: InputDecoration(
hintText: _hintPass,
),
obscureText: true,
maxLength: 20,
validator: (text) {
if(text.isEmpty)
return "Password is required";
},
),

SizedBox(height: 30.0,),
SizedBox(
height: 44.0,
child: RaisedButton(
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15.0)),
child: Text("Login", style: TextStyle(fontSize: 18.0),),
textColor: Colors.white,
color: Colors.red,
onPressed: (){
_cancelAuthenticate();
Navigator.of(context).pushReplacementNamed("/page");
}
),
),


SizedBox(height: 30.0,),
Text(_errorMessage, style: TextStyle(color: Colors.red),),

],
),

),
),
);;
}
}
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page.dart
import 'package:flutter/material.dart';

class Page extends StatefulWidget {
@override
_PageState createState() => _PageState();
}

class _PageState extends State<Page> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Welcome"),
centerTitle: true,
backgroundColor: Colors.red,
),
body: Center(
child: Container(
child: Text("Welcome"),
),
),
);
}
}
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Android Permission #
Update your project's AndroidManifest.xml file to include the USE_FINGERPRINT permissions:
<uses-permission android:name="android.permission.USE_FINGERPRINT"/>
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Error Codes #
List of possible errors during authentication. It can be manually replaced by local language if necessary.



errorCode
errorMessage




BIO-PROGRESS
Authentication already in progress


BIO-CANCEL
Authentication Cancelled


BIO-ERROR
Internal Error


BIO-ERROR
Phone not secured by PIN, pattern or password, or SIM is currently locked.


BIO-ERROR
No fingerprint enrolled on this device.


BIO-ERROR
Fingerprint is not available on this device.


BIO-ERROR
Generic Error


BIO-ERROR
"Error message return by device"



Getting Started #
This project is a starting point for a Flutter
plug-in package,
a specialized package that includes platform-specific implementation code for
Android and/or iOS.
For help getting started with Flutter, view our
online documentation, which offers tutorials,
samples, guidance on mobile development, and a full API reference.