flutter_line_sdk
A Flutter plugin that lets developers access LINE's native SDKs in Flutter apps with Dart.
The plugin helps you integrate LINE Login features in your app. You can redirect users to LINE or a web page where they log in with their LINE credentials. Example:
import 'package:flutter_line_sdk/flutter_line_sdk.dart';
void login() async {
try {
final result = await LineSDK.instance.login();
setState(() {
_userProfile = result.userProfile;
// user id -> result.userProfile?.userId
// user name -> result.userProfile?.displayName
// user avatar -> result.userProfile?.pictureUrl
// etc...
});
} on PlatformException catch (e) {
// Error handling.
print(e);
}
}
For more examples, see the example app and API definitions.
Prerequisites
From version 2.0, flutter_line_sdk
supports null safety. If you are still seeking a legacy version without null safety, check version 1.3.0.
- iOS 13.0 or later as the deployment target
- Android
minSdkVersion
set to 24 or higher (Android 7.0 or later) - LINE Login channel linked to your app
To access your LINE Login channel from a mobile platform, you need some extra configuration. In the LINE Developers console, go to your LINE Login channel settings, and enter the below information on the App settings tab.
iOS app settings
Setting | Description |
---|---|
iOS bundle ID | Required. Bundle identifier of your app. In Xcode, find it in your Runner project settings, on the General tab. Must be lowercase, like com.example.app . You can specify multiple bundle identifiers by typing each one on a new line. |
iOS universal link | Optional. Set to the universal link configured for your app. For more information on how to handle the login process using a universal link, see Universal Links support. |
Android app settings
Setting | Description |
---|---|
Android package name | Required. Application's package name used to launch the Google Play store. |
Android package signature | Optional. You can set multiple signatures by typing each one on a new line. |
Android scheme | Optional. Custom URL scheme used to launch your app. |
Installation
Adding flutter_line_sdk package
Use the standard way of adding this package to your Flutter app, as described in the Flutter documentation. The process consists of these steps:
- Open the
pubspec.yaml
file in your app folder and, underdependencies
, addflutter_line_sdk:
. - Install it by running this in a terminal:
flutter pub get
Now, the Dart part of flutter_line_sdk
should be installed. Next, you need to set up LINE SDK for iOS and Android projects, respectively.
Set up LINE SDK
iOS
Open the file ios/Runner/Info.plist
in a text editor and insert this snippet just before the last </dict>
tag:
<key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleTypeRole</key>
<string>Editor</string>
<key>CFBundleURLSchemes</key>
<array>
<!-- Specify URL scheme to use when returning from LINE to your app. -->
<string>line3rdp.$(PRODUCT_BUNDLE_IDENTIFIER)</string>
</array>
</dict>
</array>
<key>LSApplicationQueriesSchemes</key>
<array>
<!-- Specify URL scheme to use when launching LINE from your app. -->
<string>lineauth2</string>
</array>
Because LINE SDK now requires iOS 13.0 or above to provide underlying native features, you must add this line in the Runner
target in ios/Podfile
:
target 'Runner' do
+ platform :ios, '13.0'
use_frameworks!
use_modular_headers!
...
Android
To ensure compatibility with the latest features, you need to update the minSdk
version in your app's build.gradle
file to 24
or higher.
Here's how you can do it:
- Open your app's
build.gradle
file. - Locate the
android
block, and within it, find thedefaultConfig
block. - In the
defaultConfig
block, replace the currentminSdk
value with24
.
Here's a diff to show what your changes might look like:
android {
defaultConfig {
- minSdk flutter.minSdkVersion
+ minSdk 24
}
}
Importing and using
Setup
Import flutter_line_sdk
to any place you want to use it in your project:
import 'package:flutter_line_sdk/flutter_line_sdk.dart';
To use the package, you need to set up your channel ID. You can do this by calling the setup
method, for example in the main
function:
- void main() => runApp(MyApp());
+ void main() {
+ WidgetsFlutterBinding.ensureInitialized();
+ LineSDK.instance.setup("${your_channel_id}").then((_) {
+ print("LineSDK Prepared");
+ });
+ runApp(App());
+ }
This is merely an example. You can call setup
any time you want, provided you call it exactly once, before calling any other LINE SDK methods.
To help you get started with this package, we list several basic usage examples below. All available flutter_line_sdk
methods are documented on the Dart Packages site.
Login
Now you are ready to let your user log in with LINE.
Get the login result by assigning the value of Future<LoginResult>
to a variable.
To handle errors gracefully, wrap the invocation in a try...on
statement:
void _signIn() async {
try {
final result = await LineSDK.instance.login();
// user id -> result.userProfile?.userId
// user name -> result.userProfile?.displayName
// user avatar -> result.userProfile?.pictureUrl
} on PlatformException catch (e) {
_showDialog(context, e.toString());
}
}
By default, login
uses ["profile"]
as its scope. In this case, when login is done, you have a userProfile
value in login result
.
If you need other scopes, pass them in a list to login
. See the Scopes documentation for more.
final result = await LineSDK.instance.login(
scopes: ["profile", "openid", "email"]
);
// user email, if user set it in LINE and granted your request.
final userEmail = result.accessToken.email;
Although it might be useless, if you do not contain a
"profile"
scope,userProfile
will be a null value.
Logout
try {
await LineSDK.instance.logout();
} on PlatformException catch (e) {
print(e.message);
}
Get user profile
try {
final result = await LineSDK.instance.getProfile();
// user id -> result.userId
// user name -> result.displayName
// user avatar -> result.pictureUrl
} on PlatformException catch (e) {
print(e.message);
}
Get current stored access token
try {
final result = await LineSDK.instance.currentAccessToken;
// access token -> result?.value
} on PlatformException catch (e) {
print(e.message);
}
If the user isn't logged in, it returns a
null
. A validresult
of this method doesn't necessarily mean the access token itself is valid. It may have expired or been revoked by the user from another device or LINE client.
Verify access token with LINE server
try {
final result = await LineSDK.instance.verifyAccessToken();
// result.data is accessible if the token is valid.
} on PlatformException catch (e) {
print(e.message);
// token is not valid, or any other error.
}
Refresh current access token
try {
final result = await LineSDK.instance.refreshToken();
// access token -> result.value
// expires duration -> result.expiresIn
} on PlatformException catch (e) {
print(e.message);
}
Normally, you don't need to refresh access tokens manually, because any API call in LINE SDK will try to refresh the access token automatically when necessary. We do not recommend refreshing access tokens yourself. It's generally easier, more secure, and more future-proof to let the LINE SDK manage access tokens automatically.
Error handling
All APIs can throw a PlatformException
with error code
and a message
. Use this information to identify when an error happens inside the native SDK.
Error codes and messages will vary between iOS and Android. Be sure to read the error definition on iOS and Android to provide better error recovery and user experience on different platforms.
Contributing
If you believe you found a vulnerability or you have an issue related to security, please DO NOT open a public issue. Instead, send us an email at dl_oss_dev@linecorp.com.
Before contributing to this project, please read CONTRIBUTING.md.
Libraries
- line_login_sdk
- A Flutter plugin for using the LINE SDKs with Dart in Flutter apps.