feat(maui): add missing Activity lifecycle events on Android

Author: jpnurmi

src/Sentry.Maui/Internal/AndroidActivityBreadcrumbsIntegration.cs

@@ -0,0 +1,39 @@
+#if ANDROID
+using Microsoft.Maui.LifecycleEvents;
+using Activity = Android.App.Activity;
+
+namespace Sentry.Maui.Internal;
+
+// Capture Android Activity lifecycle events as breadcrumbs.
+// See: https://github.com/getsentry/sentry-java/blob/ab8a72db41b2e5c66e60cef3102294dddba90b20/sentry-android-core/src/main/java/io/sentry/android/core/ActivityBreadcrumbsIntegration.java
+internal static class AndroidActivityBreadcrumbsIntegration
+{
+    public static void Register(IAndroidLifecycleBuilder lifecycle)
+    {
+        lifecycle.OnCreate((activity, _) => AddBreadcrumb(activity, "created"));
+        lifecycle.OnStart(activity => AddBreadcrumb(activity, "started"));
+        lifecycle.OnResume(activity => AddBreadcrumb(activity, "resumed"));
+        lifecycle.OnPause(activity => AddBreadcrumb(activity, "paused"));
+        lifecycle.OnStop(activity => AddBreadcrumb(activity, "stopped"));
+        lifecycle.OnSaveInstanceState((activity, _) => AddBreadcrumb(activity, "saveInstanceState"));
+        lifecycle.OnDestroy(activity => AddBreadcrumb(activity, "destroyed"));
+    }
+
+    private static void AddBreadcrumb(Activity activity, string state)
+    {
+        var breadcrumb = new Breadcrumb(
+            DateTimeOffset.UtcNow,
+            message: null,
+            type: MauiEventsBinder.NavigationType,
+            data: new Dictionary<string, string>
+            {
+                { "screen", activity.Class.SimpleName },
+                { "state", state }
+            },
+            category: MauiEventsBinder.LifecycleCategory,
+            level: BreadcrumbLevel.Info
+        );
+        SentrySdk.AddBreadcrumb(breadcrumb);
+    }
+}
+#endif

src/Sentry.Maui/Internal/SentryMauiOptionsSetup.cs

@@ -26,6 +26,11 @@ public void Configure(SentryMauiOptions options)
         _config.Bind(bindable);
         bindable.ApplyTo(options);
 
+#if __ANDROID__
+        // Disable Android Activity lifecycle breadcrumbs as Sentry.Maui already tracks these.
+        options.Native.EnableActivityLifecycleBreadcrumbs = false;
+#endif
+
 #if __ANDROID__ || __IOS__
         options.Native.AttachScreenshot = options.AttachScreenshot;
 #endif

src/Sentry.Maui/SentryMauiAppBuilderExtensions.cs

@@ -140,6 +140,8 @@ private static void RegisterMauiEventsBinder(this MauiAppBuilder builder)
 
                 lifecycle.OnStop(activity => SentryMauiEventProcessor.InForeground = false);
                 lifecycle.OnPause(activity => SentryMauiEventProcessor.InForeground = false);
+
+                AndroidActivityBreadcrumbsIntegration.Register(lifecycle);
             });
 #elif WINDOWS
             events.AddWindows(lifecycle =>