Firebase Crashlytics integration in mobile app

NOVASOLUTIONS.TECHNOLOGY is engaged in the development, support and maintenance of iOS, Android, PWA mobile applications. We have extensive experience and expertise in publishing mobile applications in popular markets like Google Play, App Store, Amazon, AppGallery and others.
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Development and support of all types of mobile applications:
Information and entertainment mobile applications
News apps, games, reference guides, online catalogs, weather apps, fitness and health apps, travel apps, educational apps, social networks and messengers, quizzes, blogs and podcasts, forums, aggregators
E-commerce mobile applications
Online stores, B2B apps, marketplaces, online exchanges, cashback services, exchanges, dropshipping platforms, loyalty programs, food and goods delivery, payment systems.
Business process management mobile applications
CRM systems, ERP systems, project management, sales team tools, financial management, production management, logistics and delivery management, HR management, data monitoring systems
Electronic services mobile applications
Classified ads platforms, online schools, online cinemas, electronic service platforms, cashback platforms, video hosting, thematic portals, online booking and scheduling platforms, online trading platforms

These are just some of the types of mobile applications we work with, and each of them may have its own specific features and functionality, tailored to the specific needs and goals of the client.

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Firebase Crashlytics integration in mobile app
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Firebase Crashlytics Integration in Mobile Applications

Crash on cold startup in 0.3% of users. Device logs show EXC_BAD_ACCESS without stack. Without Crashlytics, this means hours of searching: can't reproduce, device is different, iOS version is different. Crashlytics collects symbolicated stack trace, OS version, device, previous user actions and delivers it to console within minutes of crash.

SDK Connection

iOS via Swift Package Manager: add FirebaseCrashlytics from firebase-ios-sdk repository. Initialization happens automatically via FirebaseApp.configure() in AppDelegate or via @main + FirebaseOptions.

Mandatory step often skipped: dSYM upload. Without symbol files, Crashlytics shows memory addresses instead of function names. For automatic upload add run script in Build Phases:

"${PODS_ROOT}/FirebaseCrashlytics/run"
# or via SPM:
"${BUILD_DIR%Build/*}SourcePackages/checkouts/firebase-ios-sdk/Crashlytics/run"

On Android SDK connects via Gradle plugin: id 'com.google.firebase.crashlytics' in app/build.gradle. ProGuard/R8 mapping uploads automatically on release build if firebaseCrashlytics { mappingFileUploadEnabled = true } is configured.

Custom Keys and Logs

Automatic crash report is baseline minimum. Real value is context around crash:

// iOS
Crashlytics.crashlytics().setCustomValue(userID, forKey: "user_id")
Crashlytics.crashlytics().setCustomValue("checkout", forKey: "last_screen")
Crashlytics.crashlytics().log("CartViewModel: starting checkout, items=\(cart.count)")

// Non-fatal error — lands in Crashlytics without app crash
Crashlytics.crashlytics().record(error: NetworkError.timeout)

// Android
Firebase.crashlytics.setCustomKey("user_id", userId)
Firebase.crashlytics.setCustomKey("last_screen", "checkout")
Firebase.crashlytics.log("CartViewModel: checkout, items=${cart.size}")

Firebase.crashlytics.recordException(NetworkTimeoutException("checkout API"))

recordException / record(error:) is powerful for tracking errors that don't crash app but affect UX: expired token, empty API response, broken deeplink.

ANR and non-fatal on Android

On Android, Crashlytics automatically captures ANR (Application Not Responding) from SDK 18.3+. If app hangs for >5 seconds, console gets ANR report with thread dump state. Separate from crashes, often related to main thread blocking via synchronous disk or network operations.

Crashlytics + Alerts

In Firebase console configure velocity alerts: if new version gets crash-free rate below threshold (usually 99.5%) within hour of release, email/Slack notification arrives. Catches regression before it hits entire audience.

Typical Integration Error

dSYMs don't upload for bitcode builds (relevant for old iOS projects). Apple recompiles bitcode on their servers, final symbols differ from local. Solution: in Firebase Console → Project Settings → App → "Upload dSYMs" upload archive manually, or configure fastlane with firebase_app_distribution plugin and upload_symbols_to_crashlytics.

What's Included in Work

  • SDK connection (SPM / CocoaPods on iOS, Gradle on Android)
  • Auto-upload setup for dSYM / mapping files
  • Custom keys for context: user_id, screen, session state
  • recordException for non-fatal errors in key flows
  • Velocity alert in console

Timeline

Full integration with custom keys and non-fatal errors: 1 day. Cost estimated individually.