iProov.NET.Android 10.0.2

iProov.NET.Android NuGet

Introduction

The iProov.NET.Android NuGet enables you to integrate iProov's SDK into your .NET Android projects.

This NuGet wraps iProov's existing native Android SDK behind a .NET interface for use from within your .NET app.

For a more extensive documentation on iProov's .NET packages check the public GitHub repository here.

Use Flows and Coroutines

Since version 10.0.0 of the Android SDK the use of Flows is necessary to collect information from a claim.

When using iProov.NET.Android integrators need to use the .NET libraries for Flows and Coroutines and create the necessary classes to handle the values returned by the SDK. This is all explained in the How to use it section and the code for the necessary classes can be found here.

As an alternative solution, integrators can use the iProov.NET.MAUI package instead (here), which already wraps the iProov.NET.Android package into a callback based API.

Requirements

• NET 8 (net8-android)
• Android API Level 26 (Android 8) and above

How to use it

The approach presented next assumes the following classes are used:

• IStateListener interface to to be implemented to receive iProov.State updates.
• FlowCollector to collect the states from a Session and notify those changes to the IStateListener
• FlowContinuation necessary to collect values from a flow.

1. Using the NuGet Package Manager, add the iProov.NET.Android package to your project.

2. Import the package into your project with using iProov.NET.Android;

3. Create a class which implements IStateListener to handle the callbacks from the Android SDK:

    public class IProovListener : IStateListener
    {
   
    	public void OnConnected()
    	{
       		// Called when the SDK is connecting to the server. You should provide an indeterminate
       		// progress indication to let the user know that the connection is being established.
    	}
   
    	public void OnConnecting()
    	{
       		// The SDK has connected, and the iProov user interface will now be displayed. You
       		// should hide any progress indication at this point.
    	}
   
    	public void OnCanceled(IProov.Canceler canceler)
    	{
       		// Either the user canceled iProov by pressing the Close button at the top right or
    		// the Home button (canceler == USER)
    		// The session was canceled by the integrator using Session.cancel() (canceler == INTEGRATION).
    		// You should use this to determine the next step in your flow.
    	}
   
    	public void OnError(IProovException error)
    	{
    		// The user was not successfully verified/enrolled due to an error (e.g. lost internet connection)
    		// along with an IProovException.
    		// It will be called once, or never.
    	}
   
    	public void OnFailure(IProov.FailureResult result)
    	{
    		// The user was not successfully verified/enrolled, as their identity could not be verified,
    		// or there was another issue with their verification/enrollment. A reason (as a string resource id)
    		// is provided as to why the claim failed, along with a feedback code from the back-end.
   
    		var feedbackCode = result.FeedbackCode;
    		var reason = result.Reason.Description;
    	}
   
    	public void OnProcessing(double progress, string message)
    	{
    		// The SDK will update your app with the progress of streaming to the server and authenticating
    		// the user. This will be called multiple times as the progress updates.
    	}
   
    	public void OnSuccess(IProov.SuccessResult result)
    	{
    		// The user was successfully verified/enrolled and the token has been validated.
    		// You must always independently validate the token server-side (using the /validate API call) 
    		// before performing any authenticated user actions.
    	}
   
    }
   
   

   Alternatively you could just implement IStateListener on your Activity class.

4. Create an instance of FlowCollector passing your IStateListener in the constructor.

    private void launchIProov() {
    	...
    	IProovListener listener = new IProovListener();
    	FlowCollector flowCollector = new FlowCollector(listener);
    	...
    }
   

5. Once you have obtained a token (either via the .NET API Client or other means), you can now launch iProov. To do so, first you need to create a Session and set up the collection of State values for it (use FlowContinuation here), after that you can start the session:

    private void launchIProov() {
    	...
    	IProovListener listener = new IProovListener();
    	FlowCollector flowCollector = new FlowCollector(listener);
    	FlowContinuation continuation = new FlowContinuation();
   
    	IProov.Options options = new IProov.Options();
   
       IProov.ISession session = IProov.Instance.CreateSession(this, "wss://eu.rp.secure.iproov.me/ws", token, options);
       session.State.Collect(flowCollector, continuation);
       session.Start();
    }
   

👉 You should now familiarise yourself with the iProov Android SDK documentation which provides comprehensive details about the available customization options and other important details regarding the Android SDK usage.

Canceling the session

Under normal circumstances, a session will be canceled by the user (Canceler.USER) by pressing the back button or the close button. However, there may be situations where an integrator may need to cancel an ongoing session. For those situations, integrators can invoke the Cancel() method from the ISession created to perform a scan.

IProov.ISession session = IProov.Instance.CreateSession(context, wss_url, token, options);

session.Cancel();

Additional code

IStateListener

namespace <YOUR_NAMESPACE>;

using iProov.NET.Android;

public interface IStateListener
    {
        void OnCanceled(IProov.Canceler canceler);
        void OnConnected();
        void OnConnecting();
        void OnError(IProovException exception);
        void OnFailure(IProov.FailureResult failure);
        void OnProcessing(double progress, string? message);
        void OnSuccess(IProov.SuccessResult successResult);
    }

FlowCollector

namespace <YOUR_NAMESPACE>;

using iProov.NET.Android;
using Xamarin.KotlinX.Coroutines.Flow;
using Kotlin.Coroutines;

public class FlowCollector : Java.Lang.Object, IFlowCollector
    {
        private IStateListener listener;
        public FlowCollector(IStateListener callbackListener) {
            listener = callbackListener;
        }
        
        public Java.Lang.Object? Emit(Java.Lang.Object? value, IContinuation p1)
        {
            if (value != null && value is IProov.State state) {
                notifyListener(state);
                p1.ResumeWith(value);
            }

            return value;
        }

        private void notifyListener(IProov.State state) {
            switch (state)
            {
                case IProov.State.Connected:
                    listener.OnConnected();
                    break;
                case IProov.State.Connecting:
                    listener.OnConnecting();
                    break;
                case IProov.State.Processing:
                    if (state is IProov.State.Processing processing)
                        listener.OnProcessing(processing.Progress, processing.Message);
                    break;
                case IProov.State.Canceled:
                    if (state is IProov.State.Canceled canceled)
                        listener.OnCanceled(canceled.Canceler);
                    break;
                case IProov.State.Error:
                    if (state is IProov.State.Error error)
                        listener.OnError(error.Exception);
                    break;
                case IProov.State.Failure:
                    if (state is IProov.State.Failure failure)
                        listener.OnFailure(failure.FailureResult);
                    break;
                case IProov.State.Success:
                    if (state is IProov.State.Success success)
                        listener.OnSuccess(success.SuccessResult);
                    break;
            }
        }
    }

FlowContinuation

namespace <YOUR_NAMESPACE>;

using Kotlin.Coroutines;
public class FlowContinuation : Java.Lang.Object, IContinuation
    {
        public ICoroutineContext Context => EmptyCoroutineContext.Instance;
        public void ResumeWith(Java.Lang.Object result){}
    }