Hybrid - Android

You can hook up your web view to the SDK in only a few steps and immediately provide a much more pleasant experience when using Klarna products on mobile.


Your checkout screen when Klarna is selected as payment method.	Klarna purchase flow starts when customer confirms to Continue with Klarna.	Your order confirmation screen after a successful payment.

Integration Steps

Prepare: Make sure you have a web checkout integrated with Klarna Payments.
Set up your app (Mobile App): Set up return URL to your application.
Present your web checkout (Mobile App): Present you web checkout using System WebView.

This guide will lead you through all the steps required to accept Klarna Payments in your mobile app using your web integration. At the end, you will be able to accept payments with Klarna with very few native changes.

This guide assumes that you already have a web checkout integrated with Klarna Payments and you intend to use it in your mobile application. If you haven't done such web integration, we suggest you to check the web payments documentation.

Set up your app

Import the SDK

Add the Repository

Add the Klarna Mobile SDK maven repository:

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repositories {
    maven("https://x.klarnacdn.net/mobile-sdk/")
}

Add the Dependency

Add the SDK as a dependency to your app:

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dependencies {
    implementation("com.klarna.mobile:sdk:2.x.x")
}

To read more about Mobile SDK versioning policy, check out this section.

Set up your app

Return URL

Klarna purchase flows might require authorizations in other applications (e.g. bank apps) or do a handover to the Klarna app. In such cases, a return URL to your application ensures seamless return to the flow in your app, hence setting up a return URL is required. It is expected that redirects to this URL should only open your application without any changes in the UI state, ensuring the customer can continue the flow prior to external navigation.

You can read more about how deep links and intent filters work on the Android Developers site.

You can set up a Return URL app scheme for your application by registering an intent-filter for the Activity you integrated Klarna, in your app’s AndroidManifest.xml:

XML

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<application...>
    <activity...>
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="<your-custom-scheme>" />
            <data android:host="<your-custom-host>" />
        </intent-filter>
    </activity>

Important: Construct the return URL string passed to Klarna by combining the attributes defined in your <intent-filter>'s <data> tags, following the standard URL format: <your-custom-scheme>://<your-custom-host>

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override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)
    intent?.data?.let { uri ->
        if (uri.host == Contants.klarnaReturnUrl.host && uri.host == Contants.klarnaReturnUrl.host) {
            // This is a return URL for Klarna – skip deep linking
            return
        }
        // This was not a return URL for Klarna
    }
}

The hosting Activity should be using launchMode of type singleTask or singleTop to prevent a new instance from being created when returning from an external application.

Present your web checkout

Create a WebView

In order to use your web integration in the app, first step would be to create a WebView for loading your checkout URLs. You can simply do this by initiating the WebView first.

Retrieve WebView inflated from XML

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val webView = findViewById(R.id.webView)
webView.webViewClient = this
webView.loadUrl("https://www.merchant.com/checkout") // Load your checkout page where Klarna Payments is integrated

Create a new WebView from code

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webView = WebView(context)
webView.webViewClient = this
webView.loadUrl("https://www.merchant.com/checkout") // Load your checkout page where Klarna Payments is integrated

Having an implementation for WebViewClient is important as you will need it in the following steps.

Create an Hybrid SDK instance

Initialize the Hybrid SDK by creating a new instance of KlarnaHybridSDK. You should hold a strong reference to the SDK. It will deallocate all its resources if you null it. You only need a single instance of the SDK, regardless of how many web views you have, but if you need to, you can create several SDKs.

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val hybridSDK = KlarnaHybridSDK(returnUrl, null, null)
hybridSDK.eventHandler = this

Creating an Instance

Param	Type	Description
returnUrl	String	A URL that the SDK can use to return customers to your app.
eventCallback	KlarnaEventCallback?	Event Callback interface that will notify you about messages and errors. This is not required as you will be using the KlarnaEventHandler.
fullscreenEventCallback	KlarnaFullscreenEventCallback?	Fullscreen event Callback interface that will notify you about fullscreen transition events. This is not required.

KlarnaEventHandler

The SDK will notify you of events and errors via event callback object that you’ll need to implement. The SDK also notifies you about different events during fullscreen transition via fullscreen event callback. You will need to implement the KlarnaEventHandler interface in order to receive events and errors from the SDK. This will let your app be notified about relevant events and errors that happen inside the web view that the SDK is observing.

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    class MyActivity: AppCompatActivity(), KlarnaEventHandler {
        override fun onEvent(klarnaComponent: KlarnaComponent, event: KlarnaProductEvent) {
            // Implementation for dispatched event
        }

        override fun onError(klarnaComponent: KlarnaComponent, error: KlarnaMobileSDKError) {
            // Implementation for encountered error
        }
    }

Add your WebView

You need to add the web views that the SDK should track. The SDK will hold weak references to these web views, so if they’re deallocated, the SDK will lose track of them.

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hybridSDK.addWebView(webView)

Notify the SDK

There are two instances at which you’ll need to notify the SDK of events in your web view (as we don’t override your WebViewClient).

You should notify the SDK about upcoming navigations by calling the SDK’s shouldFollowNavigation from your WebViewClient.

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class MyWebViewClient(): WebViewClient() {
    override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
        return !hybridSDK.shouldFollowNavigation(url)
    }
}

You need to notify the SDK after a page has loaded by calling the SDK’s newPageLoad from your WebViewClient.

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class MyWebViewClient(): WebViewClient() {
    override fun onPageFinished(view: WebView, url: String) {
        hybridSDK.newPageLoad(view)
    }
}

As you are re-using your web integration, this integration approach assumes that you have implemented order creation via the integration that exists in web. Hence, this documentation does not cover this step, if you would like to learn more about authorizing a session and creating an order in web, check out these documentations:

Optional

Enable logging

The SDK will log events and errors while it’s running, which you can read in logcat console. You can set the logging level for the SDK through the loggingLevel property of integration instance.

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hybridSdk.loggingLevel = KlarnaLoggingLevel.Verbose

KlarnaLoggingLevel

Value	Description
KlarnaLoggingLevel.Off	No logging
KlarnaLoggingLevel.Error	Log error messages only
KlarnaLoggingLevel.Verbose	Log all messages (debug and error)

What's next

Klarna Mobile SDK provides a full suite of mobile-first integrations, including Klarna products like:


Sign in with Klarna	On-site Messaging	Express Checkout

On-site Messaging: Show contextual messaging let your customers know about the available payment options in pre-checkout: click here to learn more.
Sign in with Klarna: Seamlessly identify and let users login via their Klarna account: click here to learn more.
Express Checkout: Accelerate your checkout process and boost conversion by offering a one-click checkout, click here to learn more (Mobile SDK support available soon).

Complete your integration with

Hybrid - Android

Integration Steps

Prepare

Set up your app

Import the SDK

Add the Repository

Add the Dependency

Set up your app

Return URL

Present your web checkout

Create a WebView

Retrieve WebView inflated from XML

Create a new WebView from code

Create an Hybrid SDK instance

Creating an Instance

KlarnaEventHandler

Add your WebView

Notify the SDK

Before a Navigation

After a Navigation

Optional

Enable logging

KlarnaLoggingLevel

What's next