Unlock Better Version of Your Mobile App (By: Abid Jamil) - DevFest 2022

Talk by Abid Jamil (https://www.linkedin.com/in/abidjamil) at DevFest Lahore 2022 by GDG Lahore.

Transcript

1. Unlock Better Version of Your Mobile App Abid Jamil 
 Engineering Manager @ Jugnu
2. 50% Stability & bugs When leaving a 1 star review, 50% of the time the user mentions the app stability and bugs Google analysis on Play reviews, top 10 English speaking countries, last 365 days of reviews
4. I need contextual insights of my crashes
5. I Never want to miss 
 critical crash
6. I want create alerts and Jira Tickets
8. Step 1: Add the Crashlytics SDK to your ap p In your module (app-level) Gradle fi le (usually <project>/<app-module>/build.gradle), add the dependency for the Crashlytics Android library.
9. In your root-level (project-level) Gradle fi le (<project>/build.gradle), add the Crashlytics Gradle plugin as a buildscript dependency: Step 2: Add the Crashlytics Gradle plugin to your ap p
10. In your module (app-level) Gradle fi le (usually <project>/<app-module>/ build.gradle), add the Crashlytics Gradle plugin:
11. But traditional firebase report is not enough
12. To give yourself more context for the events leading up to a crash, you can add custom Crashlytics logs to your app
13. To diagnose an issue, it’s often helpful to know which of your users experienced a given crash. Crashlytics includes a way to anonymously identify users in your crash reports.
14. Set user identi fi er s Add Custom Log s val crashlytics = Firebase.crashlytic s crashlytics.setCustomKeys { key("device", "android" ) key("email", user.email ) key("id", user.id ) key("name", user.name ) key("phone", user.phone ) } Add Custom Key s
17. public class MyHandler implements Thread.UncaughtExceptionHandler { private final Thread.UncaughtExceptionHandler mPriorExceptionHandler; public MyHandler(Thread.UncaughtExceptionHandler prior) { mPriorExceptionHandler = prior; } @Override public void uncaughtException(Thread thread, Throwable throwable) { // Deal with throwable here if (mPriorExceptionHandler != null) { mPriorExceptionHandler.uncaughtException(thread, throwable); } } }
18. Thread.UncaughtExceptionHandler prior = Thread.getDefaultUncaughtExceptionHandler(); Thread.setDefaultUncaughtExceptionHandler( new MyUncaughtExceptionHandler(prior));
20. Performance == Quality
21. 60% Speed, design & usability When leaving a 5 star review, 60% of the time the user mentions the speed, design or usability Google analysis on Play reviews, top 10 English speaking countries, last 365 days of reviews
24. Firebase Performance Monitoring • Runs in production • Negligible overhead • Automatic and Custom traces • Automatic HTTP/S traffic metrics
25. Trace • A report for a period of time with a well-defined beginning and end • Nominally has a duration • Also may contain "counters" for performance-related events during the trace
26. Automatic Traces - no coding necessary! • App Start (cold) • Time in foreground • Time in background
27. Automatic Traces - App Start ContentProvider.onCreate() Activity.onResume() But you might want something different!
28. Counters • Associate a string/count value to a Trace • Typically better to measure ratios than absolute values • Abs value if you want to compare similar counters between traces cache_hit++ cache_miss++ dropped_frames += 10
29. An idea for pseudo-automatic traces
30. Implement Lifecycle Callbacks public class PerfLifecycleCallbacks implements Application.ActivityLifecycleCallbacks { private static final PerfLifecycleCallbacks instance = new PerfLifecycleCallbacks() ; private PerfLifecycleCallbacks() { } public static PerfLifecycleCallbacks getInstance() { return instance ; } }
31. Implement Lifecyclecallbacks private final HashMap<Activity, Trace> traces = new HashMap<>() ; @Overrid e public void onActivityStarted(Activity activity) { String name = activity.getClass().getSimpleName() ; Trace trace = FirebasePerformance.startTrace(name) ; traces.put(activity, trace) ; } @Overrid e public void onActivityStopped(Activity activity) { Trace trace = traces.remove(activity) ; trace.stop() ; }
32. Use Annotations import com.google. fi rebase.perf.FirebasePerformance ; import com.google. fi rebase.perf.metrics.AddTrace ; // Add the `@AddTrace` annotation above the method you want to trac e @AddTrace(name = "onCreateTrace", enabled = true /* optional */ ) override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) }
33. Use Annotations val cache = ItemCache( ) val myTrace = Firebase.performance.newTrace("test_trace" ) myTrace.start( ) val item = cache.fetch("item" ) if (item != null) { myTrace.incrementMetric("item_cache_hit", 1 ) } else { myTrace.incrementMetric("item_cache_miss", 1 ) } myTrace.stop( )
34. Android Vitals - get clues for what to measure • New in the Google Play Console: • Performance-related stats • Slow rendering (jank) • Frozen frames
35. Automatic HTTP/S transaction metrics • Response time • Payload size • Success rate • URL pattern yourcdn.com/*.jpg api.yourdomain.com/ v1/users/* api.yourdomain.com/v1/ users/*/history/*
36. HTTP/S transaction metrics breakdown • App version • Device • Country • OS level • Carrier • Radio
37. How HTTP/S monitoring works Bytecode manipulation (with ASM) URL url = new URL("https://firebase.google.com"); HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(); URL url = new URL(“https://firebase.google.com”); HttpsURLConnection conn = (HttpsURLConnection) FirebasePerfUrlConnection.instrument(url.openConnection()); Decorator inside!
38. How HTTP/S monitoring works dependencies { compile 'com.google.firebase:firebase-perf:11.0.2' } apply plugin: 'com.google.firebase.firebase-perf' Uses the Transform API
48. Thank you! Abid Jamil Engineering Manager @ Jugnu