Deep Link Instructions for Same Device Presentation (#21)

This adds instructions on configuring the same device presentation on Android apps.

MobileSdk/src/main/java/com/spruceid/mobile/sdk/ui/SameDeviceOID4VP.md

@@ -0,0 +1,39 @@
+# Same Device OpenID4VP
+
+If you already have the OpenID4VP working on your app, you need to configure a deep link to get the `openid4vp://` URL and start the flow.
+
+## Configuring the AndroidManifest.xml to Declare Intent Filters
+
+Add the following inside the `<activity android:name=".MainActivity">` tag.
+
+```xml
+<intent-filter>
+  <!-- Intent action and categories -->
+  <action android:name="android.intent.action.VIEW" />
+  <category android:name="android.intent.category.DEFAULT" />
+  <category android:name="android.intent.category.BROWSABLE" />
+  <!-- Deep link data -->
+  <data
+      android:scheme="openid4vp"
+  />
+</intent-filter>
+```
+
+## Handle the Intent
+
+Add the following inside the `override fun onCreate(...)` method.
+
+```kotlin
+super.onCreate(savedInstanceState)
+
+// ...
+
+val deepLinkUri: Uri? = intent.data
+if (deepLinkUri != null) {
+    // OID4VP flow integration
+}
+
+// ...
+```
+
+And now your app is ready to handle `openid4vp://` URLs!

README.md

@@ -33,3 +33,7 @@ called in native SDKs.
 - [Kotlin SDK](https://github.com/spruceid/mobile-sdk-kt)
 - [Swift SDK](https://github.com/spruceid/mobile-sdk-swift)
 - [Rust layer](https://github.com/spruceid/mobile-sdk-rs)
+
+## Configuring Deep Links for same device flows
+
+Click [here](./MobileSdk/src/main/java/com/spruceid/mobile/sdk/ui/SameDeviceOID4VP.md) to see how to configure the same device OpenID4VP flow.