An SDK for using FusionAuth in Android Apps.

Table of Contents

• Overview

• Getting Started

• Usage

• Example App

• Quickstart

• Documentation

• Upgrade Policy

Overview

This SDK allows you to use OAuth 2.0 and OpenId Connect functionality in an Android app with FusionAuth as the authorization server. It also provides a Token Manager to store, refresh, and retrieve tokens.

It's a highly standardized and simplified starting point for developers to easily integrate FusionAuth into their own custom mobile apps by taking care of all the dependencies.

Following OAuth 2.0 and OpenID Connect functionality are covered:

• OAuth 2.0 Authorization Code Grant
• OAuth 2.0 Refresh Token Grant
• OpenID Connect UserInfo
• OpenID Connect End Session

AppAuth-Android is used for the OAuth 2.0 Authorization Code Grant flow and OpenID Connect functionality.

The SDK is written in Kotlin and is compatible with Java.

Getting Started

To use the FusionAuth Android SDK, add the following dependency to your build.gradle file:

dependencies {
    implementation('io.fusionauth:fusionauth-android-sdk:<latest-version>')
}

After adding the dependency, you will need to initialize the AuthorizationManager with the AuthorizationConfiguration:

AuthorizationManager.initialize(
    AuthorizationConfiguration(
        fusionAuthUrl = "http://10.0.2.2:9011",
        clientId = "e9fdb985-9173-4e01-9d73-ac2d60d1dc8e",
        allowUnsecureConnection = true
    )
)

This will initialize the AuthorizationManager with the provided AuthorizationConfiguration. The AuthorizationManager is a singleton and can be accessed from anywhere in your app. The example configuration uses the IP address for your local machine, which is the default for the Android Emulator. If you are running the FusionAuth server on a different machine, you will need to replace the fusionAuthUrl with the correct URL.

Instead of specifying the AuthorizationConfiguration in code, you could also read it from a resource file:

AuthorizationManager.initialize(
    AuthorizationConfiguration.fromResources(this, R.raw.fusionauth_config)
)

The fusionauth_config.json file should be placed in the res/raw directory and should look like this:

{
  "fusionAuthUrl": "http://10.0.2.2:9011",
  "clientId": "e9fdb985-9173-4e01-9d73-ac2d60d1dc8e",
  "allowUnsecureConnection": true
}

By default, the SDK uses the MemoryStorage for storing tokens. This means that tokens will be lost when the app is closed. To persist tokens, you can use the SharedPreferencesStorage or implement your own TokenStorage.

Usage

To start the OAuth 2.0 Authorization Code Grant, you can use the oAuth() function on the AuthorizationManager to retrieve the OAuthAuthorizationService:

AuthorizationManager
    .oAuth(this@LoginActivity)
    .authorize(
        Intent(this@LoginActivity, TokenActivity::class.java),
        OAuthAuthorizeOptions(
            cancelIntent = Intent(this@LoginActivity, LoginActivity::class.java)
                .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP),
            state = "state-${System.currentTimeMillis()}"
        )
    )

The authorize function will start the OAuth 2.0 Authorization Code Grant flow and open the provided Intent when the flow is completed. The OAuthAuthorizeOptions allows you to specify additional options for the flow, such as the cancelIntent and the state.

If the user completes the flow, the TokenActivity will be opened, and you are required to handle the redirect:

AuthorizationManager.oAuth(this@TokenActivity)
    .handleRedirect(intent)

This will retrieve the authorization response, validates the state if it was provided, and exchanges the authorization code for an access token. The result of the exchange will be stored in the TokenManager.

After the user is authorized, you can use getUserInfo() to retrieve the User Info:

AuthorizationManager.oAuth(this@TokenActivity).getUserInfo()

To call your API with an access token, you can use the AuthorizationManager to retrieve a valid access token:

val accessToken = AuthorizationManager.freshAccessToken(this@TokenActivity)

This will retrieve a fresh access token from the TokenManager and return it. If the access token is expired, the TokenManager will refresh it automatically.

Finally, you can use the AuthorizationManager to sign out the user and remove the tokens from the TokenManager:

AuthorizationManager
    .oAuth(this@TokenActivity)
    .logout(
        Intent(this@TokenActivity, LoginActivity::class.java)
            .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
    )

If the user is signed out, the LoginActivity will be opened.

Example App

See the FusionAuth Android SDK Example for a functional example of an Android client that uses the SDK.

Quickstart

See the FusionAuth Android Quickstart for a full tutorial on using FusionAuth and Android.

Documentation

See the latest Full library documentation for the complete documentation of the SDK.

Contributing

We hope you love using FusionAuth Android SDK, but in case you encounter a bug or an issue with the SDK, please do let us know.

Please only report issues for the FusionAuth Android SDK itself if you have an issue with documentation or a client library follow these instructions.

Community Guidelines

As part of the FusionAuth community, please abide by the Code of Conduct.

Reporting an Issue

Before reporting an issue, please search through the already open issues to see if you could contribute.

To report an issue, please follow the instructions of the bug, feature and general issue templates.

Contributing Features and Fixes

Before starting with contributing, you'll want to look at and choose an issue to work on. Here is a basic workflow you want to work from:

1. Search the issue tracker for an issue that you want to work on. If your issue does not exist, please create a new one.
2. Search GitHub for an open or closed Pull Request that relates to the issue you want to work on. You may find that someone else is already working on it, or that the issue is already resolved in a different branch.

You can find all the open issues here.

Once you have found an issue you want to work on, we suggest to:

1. Fork the repository to your personal account.
2. Create a new branch with the name fix/issue-id or feat/issue-id.
3. And start working on that branch on the issue.

Development Tooling

During development of new features and fixes, we suggest using the following code quality tools which are preconfigured for this project:

• Detekt: ./gradlew clean detektRelease detektTest --continue or use an IDE plugin
• Android Lint: ./gradlew clean lint --continue
• Android Test: ./gradlew connectedAndroidTest

Submitting a Pull Request

When you are ready to submit your pull request, visit the main repository on GitHub and click the "Compare & pull request" button. Here you can select the branch you have been working on and create a pull request.

If you're creating a pull request for an issue, please include Closes #XXX in the message body where #XXX is the issue you're fixing. For example, Closes #42 would close issue #42.

After you have submitted your pull request, several checks will be run to ensure the changes meet the project's guidelines. If they do, the pull request will be reviewed by a maintainer and subsequently merged.

Upgrade Policy

This library may periodically receive updates with bug fixes, security patches, tests, code samples, or documentation changes.

These releases may also update dependencies, language engines, and operating systems, as we'll follow the deprecation and sunsetting policies of the underlying technologies that the libraries use.

This means that after a dependency (e.g. language, framework, or operating system) is deprecated by its maintainer, this library will also be deprecated by us, and may eventually be updated to use a newer version.