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
   

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7. Powerful
   Lightweight
   

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8. Powerful
   

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9. Ease of
   Integration
   

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

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11. Extensible
    

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12. Extensible
    Crashlytics.start(this);
    

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

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

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

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

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17. Fluent Pattern
    Crashlytics crashlytics = new Crashlytics.Builder()
    .delay(1)
    .listener(createCrashlyticsListener())
    .pinningInfo(createPinningInfoProvider())
    .build();
    Fabric.with(this, crashlytics);
    

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

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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);
    }
    }
    

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20. Gracefully
    Degrade
    

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21. Gracefully Degrade
    if (TextUtils.isEmpty(apiKey)
    if (debuggable){
    throw new IllegalArgumentException(
    “apiKey is null!");
    } else {
    return null;
    }
    }
    

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22. Minimizing
    Permissions
    

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23. Minimizing Permissions
    
    

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

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25. Permissions:
    Runtime Detection
    protected boolean canCheckNetworkState() {
    String permission = Manifest.permission.ACCESS_NETWORK_STATE;
    int result =
    context.checkCallingOrSelfPermission(permission);
    return (result == PackageManager.PERMISSION_GRANTED);
    }
    

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26. Multiple
    Application Types
    

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

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28. UI from Application Context
    WeakReference currentActivity = new WeakReference();
    @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);
    }
    });
    }
    }
    

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

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30. Lightweight
    

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31. Binary Size
    

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32. Binary Size
    

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33. 3rd Party
    Library
    Mindfulness
    

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34. 3rd Party
    Library Mindfulness
    

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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
    

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36. 3rd Party Library Mindfulness
    PROTOBUF
    KB
    OURS
    KB
    

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37. Dalvik
    Method
    Count
    

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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
    

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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.
    : 65490
    : 3
    accessibilityservice: 6
    bluetooth: 2
    content: 248
    pm: 22
    res: 45
    ...
    com: 53881
    adjust: 283
    sdk: 283
    

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40. Minimize
    Network
    Usage
    

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

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42. Reduce
    Startup
    Time
    

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

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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;
    }
    }
    

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45. Lightweight SDKs
    Binary size
    3rd party library mindfulness
    Dalvik Method Count
    Network usage
    Startup time
    

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46. Lightweight
    Powerful
    

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47. Questions?
    dev.twitter.com
    @tsmith
    

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