ফ্লাটার অ্যাপে ফেসবুক অথেনটিকেশন

import 'package:flutter/material.dart';
import 'package:flutter_facebook_auth/flutter_facebook_auth.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Facebook Sign-In Demo',
      home: FacebookLoginDemo(),
    );
  }
}

class FacebookLoginDemo extends StatefulWidget {
  const FacebookLoginDemo({super.key});

  @override
  State<FacebookLoginDemo> createState() => _FacebookLoginDemoState();
}

class _FacebookLoginDemoState extends State<FacebookLoginDemo> {
  Map<String, dynamic>? _userData;
  AccessToken? _accessToken;

  Future<void> _login() async {
    final LoginResult result = await FacebookAuth.instance.login(
      permissions: ['email', 'public_profile'],
    );

    if (result.status == LoginStatus.success) {
      _accessToken = result.accessToken;
      final userData = await FacebookAuth.instance.getUserData();
      setState(() {
        _userData = userData;
      });
    } else {
      print(result.status);
      print(result.message);
    }
  }

  Future<void> _logout() async {
    await FacebookAuth.instance.logOut();
    setState(() {
      _userData = null;
      _accessToken = null;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Facebook Login')),
      body: Center(
        child: _userData != null
            ? Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  CircleAvatar(
                    backgroundImage: NetworkImage(_userData!['picture']['data']['url']),
                    radius: 40,
                  ),
                  Text("Name: ${_userData!['name']}"),
                  Text("Email: ${_userData!['email']}"),
                  ElevatedButton(onPressed: _logout, child: const Text('Logout')),
                ],
              )
            : ElevatedButton(
                onPressed: _login,
                child: const Text('Login with Facebook'),
              ),
      ),
    );
  }
}

<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fbAPP-ID</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>APP-ID</string>
<key>FacebookClientToken</key>
<string>CLIENT-TOKEN</string>
<key>FacebookDisplayName</key>
<string>APP-NAME</string>

<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fb85620836</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>85620836</string>
<key>FacebookClientToken</key>
<string>72647d2f4637eacb3a625a2467d3e</string>
<key>FacebookDisplayName</key>
<string>Auth Demo</string>

 <key>LSApplicationQueriesSchemes</key>
<array>
  <string>fbapi</string>
</array>

<meta-data
    android:name="com.facebook.sdk.ApplicationId"
    android:value="@string/facebook_app_id"/>

<meta-data
    android:name="com.facebook.sdk.ClientToken"
    android:value="@string/facebook_client_token"/>

<activity
    android:name="com.facebook.FacebookActivity"
    android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
    android:label="@string/app_name" />

<activity
    android:name="com.facebook.CustomTabActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="@string/fb_login_protocol_scheme" />
    </intent-filter>
</activity>

<resources>
    <string name="app_name">Fb Login</string>
    <string name="facebook_app_id">85638d0836</string>
    <string name="facebook_client_token">72647b9a12fasdfgadfa625a2467d3e</string>
    <string name="fb_login_protocol_scheme">fb85638d0836</string>
</resources>

keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

vZ0Yzab3y7V9yE/Z1J3xE9x9u9E=