perf(android): Gate Compose class probes behind their features

The Compose gesture and view hierarchy class lookups ran during init
regardless of configuration. Gate the gesture locators behind
enableUserInteractionBreadcrumbs/Tracing and the Compose view hierarchy
exporter behind attachViewHierarchy, so the Compose class probes only
run when a feature that consumes them is enabled. Repeated probes of the
Compose class across both blocks are deduplicated by LoadClass's cache.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: runningcode

sentry-android-core/src/main/java/io/sentry/android/core/AndroidOptionsInitializer.java

@@ -211,15 +211,18 @@ static void initializeIntegrationsAndProcessors(
 
     final @NotNull LazyEvaluator<Boolean> isAndroidXScrollViewAvailable =
         loadClass.isClassAvailableLazy("androidx.core.view.ScrollingView", options);
-    final boolean isComposeUpstreamAvailable =
-        loadClass.isClassAvailable(COMPOSE_CLASS_NAME, options);
 
-    if (options.getGestureTargetLocators().isEmpty()) {
+    // Gated behind the features that actually consume these so the Compose class lookups only run
+    // when user interaction tracking or view hierarchy capture is enabled. Repeated COMPOSE_CLASS
+    // probes across both blocks are deduplicated by LoadClass's cache.
+    final boolean isUserInteractionEnabled =
+        options.isEnableUserInteractionBreadcrumbs() || options.isEnableUserInteractionTracing();
+    if (isUserInteractionEnabled && options.getGestureTargetLocators().isEmpty()) {
       final List<GestureTargetLocator> gestureTargetLocators = new ArrayList<>(2);
       gestureTargetLocators.add(new AndroidViewGestureTargetLocator(isAndroidXScrollViewAvailable));
 
       final boolean isComposeAvailable =
-          (isComposeUpstreamAvailable
+          (loadClass.isClassAvailable(COMPOSE_CLASS_NAME, options)
               && loadClass.isClassAvailable(
                   SENTRY_COMPOSE_GESTURE_INTEGRATION_CLASS_NAME, options));
 
@@ -229,8 +232,9 @@ static void initializeIntegrationsAndProcessors(
       options.setGestureTargetLocators(gestureTargetLocators);
     }
 
-    if (options.getViewHierarchyExporters().isEmpty()
-        && isComposeUpstreamAvailable
+    if (options.isAttachViewHierarchy()
+        && options.getViewHierarchyExporters().isEmpty()
+        && loadClass.isClassAvailable(COMPOSE_CLASS_NAME, options)
         && loadClass.isClassAvailable(
             SENTRY_COMPOSE_VIEW_HIERARCHY_INTEGRATION_CLASS_NAME, options)) {
 

sentry-android-core/src/test/java/io/sentry/android/core/AndroidOptionsInitializerTest.kt

@@ -806,6 +806,51 @@ class AndroidOptionsInitializerTest {
     assertTrue { fixture.sentryOptions.gestureTargetLocators[1] is ComposeGestureTargetLocator }
   }
 
+  @Test
+  fun `does not set gesture target locators when user interaction tracking is disabled`() {
+    fixture.sentryOptions.isEnableUserInteractionBreadcrumbs = false
+    fixture.sentryOptions.isEnableUserInteractionTracing = false
+
+    fixture.initSutWithClassLoader(
+      classesToLoad =
+        listOf(
+          AndroidOptionsInitializer.COMPOSE_CLASS_NAME,
+          AndroidOptionsInitializer.SENTRY_COMPOSE_GESTURE_INTEGRATION_CLASS_NAME,
+        )
+    )
+
+    assertTrue { fixture.sentryOptions.gestureTargetLocators.isEmpty() }
+  }
+
+  @Test
+  fun `does not set compose view hierarchy exporter when attachViewHierarchy is disabled`() {
+    // attachViewHierarchy defaults to false
+    fixture.initSutWithClassLoader(
+      classesToLoad =
+        listOf(
+          AndroidOptionsInitializer.COMPOSE_CLASS_NAME,
+          AndroidOptionsInitializer.SENTRY_COMPOSE_VIEW_HIERARCHY_INTEGRATION_CLASS_NAME,
+        )
+    )
+
+    assertTrue { fixture.sentryOptions.viewHierarchyExporters.isEmpty() }
+  }
+
+  @Test
+  fun `sets compose view hierarchy exporter when attachViewHierarchy is enabled and compose is available`() {
+    fixture.sentryOptions.isAttachViewHierarchy = true
+
+    fixture.initSutWithClassLoader(
+      classesToLoad =
+        listOf(
+          AndroidOptionsInitializer.COMPOSE_CLASS_NAME,
+          AndroidOptionsInitializer.SENTRY_COMPOSE_VIEW_HIERARCHY_INTEGRATION_CLASS_NAME,
+        )
+    )
+
+    assertTrue { fixture.sentryOptions.viewHierarchyExporters.size == 1 }
+  }
+
   @Test
   fun `AndroidMemoryCollector is set to options`() {
     fixture.initSut()