Building the Fabric SDKs - #MBLTDev (30 min)

Transcript

1. dev.twitter.com @tsmith Building the Fabric SDKs Ty Smith Sr. Android

   Engineer
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6. Fabric Sample App Cannonball Open source for iOS & Android:

   github.com/twitterdev

7. Powerful Lightweight

8. Powerful

9. Ease of Integration

10. Ease of Integration Fabric.with(this, new Crashlytics());

11. Extensible

12. Extensible Crashlytics.start(this);

13. Extensible Crashlytics.start(this, 5); Crashlytics.setListener(createCrashlyticsListener()); Crashlytics.setPinningInfo(createPinningInfoProvider()) Crashlytics.getInstance().setDebugMode(true);

14. Extensible Crashlytics.setListener(createCrashlyticsListener()); Crashlytics.setPinningInfo(createPinningInfoProvider()); Crashlytics.getInstance().setDebugMode(true); Crashlytics.start(this, 5);

15. Extensible Crashlytics.start(this, delay, listener, pinningInfo, debugMode);

16. Extensible Crashlytics.start(this, 0, null, null, null, true);

17. Fluent Pattern Crashlytics crashlytics = new Crashlytics.Builder() .delay(1) .listener(createCrashlyticsListener()) .pinningInfo(createPinningInfoProvider())

    .build(); Fabric.with(this, crashlytics);

18. Fluent Pattern Fabric.with(new Fabric.Builder(this) .kits(new Crashlytics()) .debuggable(true) .logger(new DefaultLogger(Log.VERBOSE)) .looper(getCustomLooper())

    .executor(getCustomExecutorService()) .build());

19. Extensible Classes class MyApiClient extends TwitterApiClient { interface MyService {

    @GET(“/1.1/statuses/show.json”) Tweet getTweet(@Query(“id”) int id); } MyService getMyService() { return getService(MyService.class); } }

20. Gracefully Degrade

21. Gracefully Degrade if (TextUtils.isEmpty(apiKey) if (debuggable){ throw new IllegalArgumentException( “apiKey

    is null!"); } else { return null; } }

22. Minimizing Permissions

23. Minimizing Permissions <uses-permission android:name="android.permission.INTERNET"/>

24. Minimizing Permissions Crashlytics.setUserEmail(“appuser@domain.com”);

25. Permissions: Runtime Detection protected boolean canCheckNetworkState() { String permission =

    Manifest.permission.ACCESS_NETWORK_STATE; int result = context.checkCallingOrSelfPermission(permission); return (result == PackageManager.PERMISSION_GRANTED); }

26. Multiple Application Types

27. Multiple Application Types package com.example; import android.app.Service; public class MyService

    extends Service { }

28. UI from Application Context WeakReference<Activity> currentActivity = new WeakReference<Activity>(); @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)

    void registerLifecycleCallbacks() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) { final Application app = ((Application)context); app.registerActivityLifecycleCallbacks( new ActivityLifecycleCallbacks() { @Override public void onActivityResumed(Activity activity) { currentActivity.set(activity); } }); } }

29. Powerful SDKs Ease of Integration Extensibility Support all app types

    Permission detection

30. Lightweight

31. Binary Size

32. Binary Size

33. 3rd Party Library Mindfulness

34. 3rd Party Library Mindfulness

35. How big are Fabric AARs? Fabric: 190kb Crashlytics: 90kb Beta:

    13kb Answers: 20kb Twitter API & SSO: 296kb Tweet UI: 120kb Tweet Composer: 5kb Digits: 236kb

36. 3rd Party Library Mindfulness PROTOBUF KB OURS KB

37. Dalvik Method Count

38. Dalvik Method Count >./gradlew assemble … Unable to execute dex:

    method ID not in [0, 0xffff]: 65536 Conversion to Dalvik format failed: Unable to execute dex: method ID not in [0, 0xffff]: 65536

39. Dalvik Method Count > git clone git@github.com:mihaip/dex-method-counts.git > cd dex-method-counts

    > ant jar > ./dex-method-counts path/to/App.apk Read in 65490 method IDs. <root>: 65490 : 3 accessibilityservice: 6 bluetooth: 2 content: 248 pm: 22 res: 45 ... com: 53881 adjust: 283 sdk: 283

40. Minimize Network Usage

41. Network Usage 10X SMALLER 100X FASTER XML PROTOBUF

42. Reduce Startup Time

43. Startup Time Thread.start(); Executors.newSingleThreadExecutor();

44. Startup Time class MyThreadFactory implements ThreadFactory { @Override public Thread

    newThread(Runnable runnable) { final Thread thread = new Thread(runnable); thread.setPriority(Process.THREAD_PRIORITY_BACKGROUND); return thread; } }

45. Lightweight SDKs Binary size 3rd party library mindfulness Dalvik Method

    Count Network usage Startup time

46. Lightweight Powerful

47. Questions? dev.twitter.com @tsmith