Overview

The LINE SDK for Android provides a modern way of implementing LINE APIs. The features included in this SDK will help you develop an Android app with engaging and personalized user experience.

Features

The LINE SDK for Android provides the following features.

User authentication

This feature allows users to log in to your service with their LINE accounts. With the help of the LINE SDK for Android, it has never been easier to integrate LINE Login into your app. Your users will automatically log in to your app without entering their LINE credentials if they are already logged in to LINE on their Android devices. This offers a great way for users to get started with your app without having to go through a registration process.

Utilizing user data with OpenID support

Once the user is authorized, you can get the user’s LINE profile. You can utilize the user's information registered in LINE without building your user system.

The LINE SDK supports the OpenID Connect 1.0 specification. You can get ID tokens that contain the user’s LINE profile when you retrieve the access token.

Setup

Pre-request

Create your own LINE Channel and follow the instructions here to link your app to your channel.

Package signatures

Package signatures are crucial for enhancing authentication interactions between your app and the LINE app. This field is optional; however, you can configure it by referring to the Set Package Signatures section on the LINE Developers site.

Gradle

Add mavenCentral to your repositories if it's not added yet.

repositories {
    ...
	mavenCentral()
}

Import line-sdk dependency

dependencies {
    implementation 'com.linecorp.linesdk:linesdk:$linesdk_version'
    ...
}

Quickstart

A pre-defined LINE login button is provided. You can add it to the user interface of your app to provide your users with a quick way to log in as below

Add login buton to layout xml

<com.linecorp.linesdk.widget.LoginButton
    android:id="@+id/line_login_btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

Use it in code

LoginButton loginButton = rootView.findViewById(R.id.line_login_btn);

// if the button is inside a Fragment, this function should be called.
loginButton.setFragment(this); 

// replace the string to your own channel id.
loginButton.setChannelId("the channel id you created");

// configure whether login process should be done by LINE App, or by WebView.
loginButton.enableLineAppAuthentication(true);

// set up required scopes. 
loginButton.setAuthenticationParams(new LineAuthenticationParams.Builder()
        .scopes(Arrays.asList(Scope.PROFILE))
        .build()
);

// A delegate for delegating the login result to the internal login handler. 
private LoginDelegate loginDelegate = LoginDelegate.Factory.create();
loginButton.setLoginDelegate(loginDelegate);

loginButton.addLoginListener(new LoginListener() {
    @Override
    public void onLoginSuccess(@NonNull LineLoginResult result) {
        Toast.makeText(getContext(), "Login success", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onLoginFailure(@Nullable LineLoginResult result) {
        Toast.makeText(getContext(), "Login failure", Toast.LENGTH_SHORT).show();
    }
});

Handle errors due to incorrect package signatures

In the onLoginFailure callback, result.responseCode will be AUTHENTICATION_AGENT_ERROR if the package signatures configured in the LINE Channel are incorrect.

To resolve this issue, you can either clear the package signatures field or configure it with the correct package signatures.

For more information, refer to the LINE SDK for Android guide on the LINE Developers site.

Known Issues

Motorola Android Devices Login Issue

We've identified an issue affecting LINE Login functionality specifically on Motorola Android devices. The problem is caused by the Phishing detection feature in the Moto Secure app that comes pre-installed on these devices.

Solution for Developers

If your users report login failures on Motorola devices, please guide them through these steps:

1. Open the Moto Secure app on their Motorola device
2. Navigate to "Phishing detection"
3. Temporarily disable this feature
4. Attempt to log in to your app using LINE Login
5. Once login is successful, they can safely re-enable the "Phishing detection" feature

Consider displaying them when detecting login failures on Motorola devices to improve user experience.

We are investigating the root cause and its solution.

Try the starter app

To have a quick look at the features of the LINE SDK, try our starter app by following the steps below:

1. Clone the repository.

   git clone https://github.com/line/line-sdk-android.git

2. Build the starter app.

   ./gradlew app:assembleDebug

The starter app apk file will be built as app/build/outputs/apk/debug/app-debug.apk.

Contributing

If you believe you have discovered a vulnerability or have an issue related to security, please DO NOT open a public issue. Instead, send us a mail to dl_oss_dev@linecorp.com.

For contributing to this project, please see CONTRIBUTING.md.