first step form auth by fingerprint

android/app/src/main/kotlin/com/example/doctor_app_flutter/MainActivity.kt

@@ -4,9 +4,10 @@ import androidx.annotation.NonNull;
 import io.flutter.embedding.android.FlutterActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugins.GeneratedPluginRegistrant
+import io.flutter.embedding.android.FlutterFragmentActivity
 
-class MainActivity: FlutterActivity() {
-    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
+class MainActivity: FlutterFragmentActivity() {
+     override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
         GeneratedPluginRegistrant.registerWith(flutterEngine);
     }
 }

android/app/src/profile/AndroidManifest.xml

@@ -4,4 +4,6 @@
          to allow setting breakpoints, to provide hot reload, etc.
     -->
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
+
 </manifest>

lib/widgets/auth/known_user_login.dart

@@ -1,10 +1,13 @@
 import 'dart:collection';
+import 'dart:ffi';
 
 import 'package:doctor_app_flutter/config/config.dart';
 import 'package:doctor_app_flutter/util/dr_app_shared_pref.dart';
 import 'package:doctor_app_flutter/widgets/shared/dr_app_circular_progress_Indeicator.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:hexcolor/hexcolor.dart';
+import 'package:local_auth/local_auth.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 DrAppSharedPreferances SharedPref = new DrAppSharedPreferances();
@@ -16,13 +19,16 @@ class KnownUserLogin extends StatefulWidget {
 
 class _KnownUserLoginState extends State<KnownUserLogin> {
   Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
+  final LocalAuthentication auth = LocalAuthentication();
+  String _authorized = "not Authorized";
+  bool _isAuthenticating = false;
   Future<String> loggedUserFuture;
   var loggedUser;
   Future<void> getSharedPref() async {
     SharedPref.getObj('loggedUser').then((userInfo) {
       // if(loggedUser == null){}
       loggedUser = userInfo;
-      print('dddddddddddddddd${loggedUser}');
+      // print('dddddddddddddddd${loggedUser}');
     });
   }
 
@@ -41,7 +47,6 @@ class _KnownUserLoginState extends State<KnownUserLogin> {
     return FutureBuilder(
         future: loggedUserFuture,
         builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
-          print('SnapShot ${snapshot}');
           switch (snapshot.connectionState) {
             case ConnectionState.waiting:
               return DrAppCircularProgressIndeicator();
@@ -151,16 +156,14 @@ class _KnownUserLoginState extends State<KnownUserLogin> {
       child: Column(
         children: <Widget>[
           RaisedButton(
-            onPressed: () {
-              silentLogin();
-            },
+            onPressed:_authenticate,
             elevation: 0.0,
             child: Container(
               width: double.infinity,
               height: 50,
               child: Center(
                 child: Text(
-                  "Verify using FingerPRint".toUpperCase(),
+                  "Verify using FingerPRint ${_authorized}".toUpperCase(),
                   // textAlign: TextAlign.center,
                   style: TextStyle(
                       color: Colors.white,
@@ -207,7 +210,50 @@ class _KnownUserLoginState extends State<KnownUserLogin> {
     Navigator.of(context).pushNamed('routeName');
   }
 
-  silentLogin(){
-    
+  silentLogin() {
+    _authenticate();
+  }
+ 
+ 
+ Future<void> _authenticate() async {
+   _getAvailableBiometrics();
+    bool authenticated = false;
+    try {
+      setState(() {
+        _isAuthenticating = true;
+        _authorized = 'Authenticating';
+      });
+      authenticated = await auth.authenticateWithBiometrics(
+          localizedReason: 'Scan your fingerprint to authenticate',
+          useErrorDialogs: true,
+          stickyAuth: true);
+      setState(() {
+        _isAuthenticating = false;
+        _authorized = 'Authenticating';
+      });
+    } on PlatformException catch (e) {
+      print(e);
+    }
+    if (!mounted) return;
+
+    final String message = authenticated ? 'Authorized' : 'Not Authorized';
+    setState(() {
+      print('_authorized'+_authorized);
+      _authorized = message;
+    });
+  }
+
+    Future<void> _getAvailableBiometrics() async {
+    List<BiometricType> availableBiometrics;
+    try {
+      availableBiometrics = await auth.getAvailableBiometrics();
+    } on PlatformException catch (e) {
+      print(e);
+    }
+    if (!mounted) return;
+
+    setState(() {
+      print('availableBiometrics $availableBiometrics');
+    });
   }
 }

pubspec.lock

@@ -209,6 +209,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.4"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.6"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -317,6 +324,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
+  local_auth:
+    dependency: "direct main"
+    description:
+      name: local_auth
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.1+3"
   logging:
     dependency: transitive
     description:
@@ -394,6 +408,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.4.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.1"
   pool:
     dependency: transitive
     description:

pubspec.yaml

@@ -28,6 +28,7 @@ dependencies:
   shared_preferences: ^0.5.6+3
   imei_plugin: ^1.1.6
   flutter_flexible_toast: ^0.1.4
+  local_auth: ^0.6.1+3