Before starting to add the Sign in with Klarna button or using the Sign in with Klarna SDK you will need to do two things:

1. Setting the return URL
2. Defining an event handler

<activity android:name="com.klarna.mobile.sdk.activity.KlarnaRedirectReceiverActivity" android:exported="true" tools:node="replace">
   <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-SCHEME>" android:host="<YOUR-HOST>"/>
   </intent-filter>
</activity>

When setting the returnURL parameter for KlarnaSignInButton or KlarnaSignInSDK , you need to concatenate the scheme and host you specified in AndroidManifest.xml into one value using :// as the separator, as shown here.

val button = KlarnaSignInButton(... returnURL =  “<YOUR-SCHEME>://<YOUR-HOST>”)

val eventHandler = object : KlarnaEventHandler {
   override fun onEvent(klarnaComponent: KlarnaComponent, event: KlarnaProductEvent) {
      when(event.action) {
         KlarnaSignInEvent.USER_TAPPED_BUTTON -> {
            // User tapped the KlarnaSignInButton, auth process starting
         }
         KlarnaSignInEvent.USER_AUTH -> {
            // User completed interactive auth, tokens will be fetched
         }
         KlarnaSignInEvent.USER_CANCELLED -> {

To integrate the button for Sign in with Klarna as a native view in your Android app, you need to create an instance of it, add it to your view hierarchy, and receive the results once the flow is completed.

The button for Sign in with Klarna native view in Android is called KlarnaSignInButton. You can create an instance programmatically or inflate it from an XML layout file. You can set the parameters of the button both programatically or in the XML layout file.

//Create an instance of KlarnaSignInButton
val button = KlarnaSignInButton(...)

// Add it to your container with desired layout parameters
val layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
containerViewGroup.addView(button, 0, layoutParams)

 <com.klarna.mobile.sdk.api.signin.KlarnaSignInButton
      android:id="@+id/klarnaSignInButton"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      …
/>

You can set the parameters of the Sign in with Klarna button either by setting them on the button instance or by setting them as attributes in the XML layout file.

In addition the the parameters list above, Klarna offers several themes, labels, and shapes to customize the button's appearance to match the look and feel of your app.

The KlarnaButtonTheme enumeration defines which style is applied to the button, depending on either the app’s configuration or the system settings.

In order for the button to fit into the aesthetic of your app, we offer different button shapes:

To integrate the Sign in with Klarna SDK in your Android app, you need to create an instance of KlarnaSignInSDK, call its signIn() function, and receive the results once the flow is completed.

To create an instance of the SDK you need to specify the following parameters:

To initiate the sign in flow for the user, you need to call the signIn() function of the SDK and specify the following parameters:

After calling the signIn() function you will receive the events in the event handler that you've passed to the SDK.