Demo app: Manual instrumentation

demo-app/src/main/java/io/opentelemetry/android/demo/shop/ui/Navigation.kt

@@ -12,6 +12,7 @@ import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.rememberNavController
 import androidx.compose.material3.*
+import io.opentelemetry.android.demo.OtelDemoApplication
 
 
 sealed class BottomNavItem(val route: String, val icon: ImageVector, val label: String) {
@@ -29,9 +30,9 @@ object MainDestinations {
 
 @Composable
 fun rememberAstronomyShopNavController(navController: NavHostController = rememberNavController())
-: AstronomyShopNavController = remember(navController)
+        : InstrumentedAstronomyShopNavController = remember(navController)
 {
-    AstronomyShopNavController(navController)
+    InstrumentedAstronomyShopNavController(AstronomyShopNavController(navController))
 }
 
 @Stable
@@ -52,7 +53,44 @@ class AstronomyShopNavController(
     fun navigateToCheckoutInfo(){
         navController.navigate(MainDestinations.CHECKOUT_INFO_ROUTE)
     }
+}
+
+class InstrumentedAstronomyShopNavController(
+    private val delegate : AstronomyShopNavController
+){
+    val navController: NavHostController
+        get() = delegate.navController
+
+    val currentRoute: String?
+        get() = delegate.currentRoute
+
+    fun upPress() {
+        delegate.upPress()
+    }
 
+    fun navigateToProductDetail(productId: String) {
+        delegate.navigateToProductDetail(productId)
+        generateNavigationEvent(
+            eventName = "navigate.to.product.details",
+            payload = mapOf("product.id" to productId)
+        )
+    }
+
+    fun navigateToCheckoutInfo() {
+        delegate.navigateToCheckoutInfo()
+        generateNavigationEvent(
+            eventName = "navigate.to.checkout.info",
+            payload = emptyMap()
+        )
+    }
+
+    private fun generateNavigationEvent(eventName: String, payload: Map<String, String>) {
+        val eventBuilder = OtelDemoApplication.eventBuilder("otel.demo.app.navigation", eventName)
+        payload.forEach { (key, value) ->
+            eventBuilder.put(key, value)
+        }
+        eventBuilder.emit()
+    }
 }
 
 @Composable

demo-app/src/main/java/io/opentelemetry/android/demo/shop/ui/cart/Cart.kt

@@ -12,6 +12,7 @@ import io.opentelemetry.android.demo.shop.ui.products.ProductCard
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
+import io.opentelemetry.android.demo.OtelDemoApplication
 import io.opentelemetry.android.demo.shop.clients.ProductCatalogClient
 import io.opentelemetry.android.demo.shop.clients.RecommendationService
 import io.opentelemetry.android.demo.shop.ui.products.RecommendedSection
@@ -41,7 +42,7 @@ fun CartScreen(
                 contentAlignment = Alignment.TopEnd
             ) {
                 OutlinedButton(
-                    onClick = { cartViewModel.clearCart() },
+                    onClick = { clearCart(cartViewModel) },
                     modifier = Modifier
                 ) {
                     Text("Empty Cart", color = Color.Red)
@@ -90,3 +91,14 @@ fun CartScreen(
         }
     }
 }
+
+private fun clearCart(cartViewModel: CartViewModel) {
+    generateEmptiedCartEvent(cartViewModel)
+    cartViewModel.clearCart()
+}
+
+private fun generateEmptiedCartEvent(cartViewModel: CartViewModel) {
+    val eventBuilder = OtelDemoApplication.eventBuilder("otel.demo.app", "cart.emptied")
+    eventBuilder.put("cart.total.value", cartViewModel.getTotalPrice())
+        .emit()
+}