Add App Links routing sample

AppLinksRouter.kt

@@ -0,0 +1,80 @@
+package com.shopify.example.storefront
+
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import com.shopify.checkoutsheetkit.DefaultCheckoutEventProcessor
+import com.shopify.checkoutsheetkit.ShopifyCheckoutSheetKit
+
+// [START app-links.route-url]
+class StorefrontUrl(private val uri: Uri) {
+    val isCheckout: Boolean
+        get() = uri.path?.contains("/checkouts/") == true
+
+    val isCart: Boolean
+        get() = uri.path == "/cart" || uri.path?.startsWith("/cart/") == true
+
+    val isThankYouPage: Boolean
+        get() = uri.path?.contains(Regex("/thank[-_]you", RegexOption.IGNORE_CASE)) == true
+}
+
+class AppLinksRouter(
+    private val activity: Activity,
+    private val checkoutEventProcessor: DefaultCheckoutEventProcessor,
+    private val navigateToCart: () -> Unit,
+) {
+    fun route(uri: Uri) {
+        val storefrontUrl = StorefrontUrl(uri)
+
+        when {
+            storefrontUrl.isCheckout && !storefrontUrl.isThankYouPage -> {
+                ShopifyCheckoutSheetKit.present(
+                    uri.toString(),
+                    activity,
+                    checkoutEventProcessor,
+                )
+            }
+            storefrontUrl.isCart -> navigateToCart()
+            else -> activity.startActivity(
+                Intent(Intent.ACTION_VIEW, uri).apply {
+                    addCategory(Intent.CATEGORY_BROWSABLE)
+                }
+            )
+        }
+    }
+}
+// [END app-links.route-url]
+
+// [START app-links.handle-intent]
+class MainActivity : ComponentActivity() {
+    private lateinit var appLinksRouter: AppLinksRouter
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        appLinksRouter = AppLinksRouter(
+            activity = this,
+            checkoutEventProcessor = DefaultCheckoutEventProcessor(this),
+            navigateToCart = { navigateToCart() },
+        )
+        handleIntent(intent)
+    }
+
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        setIntent(intent)
+        handleIntent(intent)
+    }
+
+    private fun handleIntent(intent: Intent) {
+        if (intent.action == Intent.ACTION_VIEW) {
+            intent.data?.let { appLinksRouter.route(it) }
+        }
+    }
+
+    private fun navigateToCart() {
+        // Navigate to your cart screen.
+    }
+}
+// [END app-links.handle-intent]