Youverify Liveness Android SDK

Software Development Kit for Youverify's Liveness Check

Installation

To install, add the following line to your app's build.gradle file:

implementation("co.youverify:liveness-sdk-android:<version>")

Add this configuration to your app module's build.gradle.kts file

defaultConfig {
    ...
    ndk {
        abiFilters.addAll(listOf("armeabi-v7a", "arm64-v8a", "x86"))
    }
    ...
}

Usage

1. Create a view model to initialize the package, here's a snippet:

private val yvAndroidSDK by viewModels<YVAndroidSDK>(factoryProducer = {
    return@viewModels object : ViewModelProvider.Factory {
        override fun <T : ViewModel> create(modelClass: Class<T>): T {
            return YVAndroidSDK(initializers) as T
        }
    }
})

where initializers are the parameters you will be passing into the SDK, such as a collection of tasks.

For a list of the valid options, check this out

1. Start the process, like so:

yvAndroidSDK.start();

This could also be called with an array of tasks represented as TaskProperties. The supplied tasks override those provided during initialization.

let livenessTasks = listOf(TaskProperties(task = Task.COMPLETE_THE_CIRCLE, timeout = TIMEOUT))
yvAndroidSDK.start(tasks = livenessTasks)

1. Start the UI, like so:

AppTheme {
    yvAndroidSDK.StartUI()
}

Full Example:

private val yvAndroidSDK by viewModels<YVAndroidSDK>(factoryProducer = {
    return@viewModels object : ViewModelProvider.Factory {
        override fun <T : ViewModel> create(modelClass: Class<T>): T {
            return YVAndroidSDK(
              tasks = listOf(TaskProperties(task = Task.COMPLETE_THE_CIRCLE, timeout = TIMEOUT)),
              publicKey = "MY_PUBLIC_KEY",
              ...,
              onSuccess = { data -> 
                // do something with data here
              }
            ) as T
        }
    }
})

AppTheme {
    yvAndroidSDK.StartUI() // to start the UI
}

Initializers

Option	Type	Required	Description	Default Value	Possible Values
sandboxEnvironment	Boolean	No	Sets whether session should run in sandbox or live mode	true	true, false
tasks	List	No	Sets tasks that need to be performed for liveness to be confirmed	null	See tasks
user	SDKUser	No	Sets details of user for which liveness check is being performed	null	See nested options below
user.firstName	String	Yes	First name of user	-	Any string
user.lastName	String	No	Last name of user	null	Any string
user.email	String	No	Email of user	null	Any string
branding	Branding	No	Customizes UI to fit your brand	null	See nested options below
branding.color	String	No	Sets your branding color	null	Valid hex or RGB string
branding.logo	String	No	Sets your logo	null	Valid image link
onClose	Function	No	Callback function that gets triggered when modal is closed	null	Any valid function
onSuccess	Function	No	Callback function that gets triggered when all tasks have been completed and passed. Called with completion data	null	Any valid function
onFailure	Function	No	Callback function that gets triggered when at least one task fails. Called with completion data	null	Any valid function

Tasks

A task is a series of instructions for users to follow to confirm liveness. Find below a list of tasks.

PS: We aim to frequently add to this list a variety of fun and yet intuitive ways of confirming liveness, so be on the lookout for more tasks!

Complete The Circle

User passes task by completing imaginary circle with head movement.

CTCTaskOptions

Option	Type	Required	Description	Default Value	Possible Values
task	Task	Yes	Id of task	-	Task.COMPLETE_THE_CIRCLE
difficulty	TaskDifficulty	No	Sets difficulty of task	TaskDifficulty.Medium	.Easy, .Medium, .Hard
timeout	Long	No	Sets time in milliseconds after which task automatically fails	20000L	Any number in milliseconds(Long)

Yes Or No

User passes task by answering a list of arbitrary questions set by you with the tilting of the head; right for a yes and left for a no.

YesOrNoTaskOptions

Option	Type	Required	Description	Default Value	Possible Values
task	Task	Yes	Id of task	-	Task.YES_OR_NO
difficulty	TaskDifficulty	No	Sets difficulty of task	TaskDifficulty.Medium	.Easy, .Medium, .Hard
timeout	Long	No	Sets time in milliseconds after which task automatically fails	20000L	Any number in milliseconds(Long)
questions	List	No	A set of questions to ask user	null	See nested options below
questions.question	String	Yes	Question to ask user. Should be a true or false type question. Eg: "Are you ready"	-	Any string
questions.answer	Boolean	Yes	Answer to the question	-	true, false
questions.errorMessage	String	No	Error message to display if user gets question wrong	undefined	Any string

Motions

User passes task by performing random motions in random sequences, which include nodding, blinking and opening of mouth.

MotionTaskOptions

Option	Type	Required	Description	Default Value	Possible Values
task	Task	Yes	Id of task	-	Task.MOTIONS
difficulty	TaskDifficulty	No	Sets difficulty of task	TaskDifficulty.Medium	.Easy, .Medium, .Hard
timeout	Long	No	Sets time in milliseconds after which task automatically fails	20000L	Any number in milliseconds(Long)
maxNods	Int	No	Maximum amount of nods a user is asked to perform	5	Any integer
maxBlinks	Int	No	Maximum amount of nods a user is asked to perform	5	Any integer

Liveness Data

The onSuccess and onFailure callbacks (if supplied) are passed the following data:

Option	Type	Description
data	LivenessData	Data passed through callback
data.faceImage	String	Face Image of user performing liveness check
data.livenessClip	String	Video of user performing liveness check
data.passed	Boolean	Indicator on whether liveness check passed or failed
data.metadata	Map<String, Any>	Metadata passed in during initialization

Credits

This SDK is developed and maintained solely by Youverify