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Building the Fabric SDKs - #MBLTDev (30 min)
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Ty Smith
October 28, 2014
Programming
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Building the Fabric SDKs - #MBLTDev (30 min)
Ty Smith
October 28, 2014
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Transcript
dev.twitter.com @tsmith Building the Fabric SDKs Ty Smith Sr. Android
Engineer
None
None
None
None
Fabric Sample App Cannonball Open source for iOS & Android:
github.com/twitterdev
Powerful Lightweight
Powerful
Ease of Integration
Ease of Integration Fabric.with(this, new Crashlytics());
Extensible
Extensible Crashlytics.start(this);
Extensible Crashlytics.start(this, 5); Crashlytics.setListener(createCrashlyticsListener()); Crashlytics.setPinningInfo(createPinningInfoProvider()) Crashlytics.getInstance().setDebugMode(true);
Extensible Crashlytics.setListener(createCrashlyticsListener()); Crashlytics.setPinningInfo(createPinningInfoProvider()); Crashlytics.getInstance().setDebugMode(true); Crashlytics.start(this, 5);
Extensible Crashlytics.start(this, delay, listener, pinningInfo, debugMode);
Extensible Crashlytics.start(this, 0, null, null, null, true);
Fluent Pattern Crashlytics crashlytics = new Crashlytics.Builder() .delay(1) .listener(createCrashlyticsListener()) .pinningInfo(createPinningInfoProvider())
.build(); Fabric.with(this, crashlytics);
Fluent Pattern Fabric.with(new Fabric.Builder(this) .kits(new Crashlytics()) .debuggable(true) .logger(new DefaultLogger(Log.VERBOSE)) .looper(getCustomLooper())
.executor(getCustomExecutorService()) .build());
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); } }
Gracefully Degrade
Gracefully Degrade if (TextUtils.isEmpty(apiKey) if (debuggable){ throw new IllegalArgumentException( “apiKey
is null!"); } else { return null; } }
Minimizing Permissions
Minimizing Permissions <uses-permission android:name="android.permission.INTERNET"/>
Minimizing Permissions Crashlytics.setUserEmail(“
[email protected]
”);
Permissions: Runtime Detection protected boolean canCheckNetworkState() { String permission =
Manifest.permission.ACCESS_NETWORK_STATE; int result = context.checkCallingOrSelfPermission(permission); return (result == PackageManager.PERMISSION_GRANTED); }
Multiple Application Types
Multiple Application Types package com.example; import android.app.Service; public class MyService
extends Service { }
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); } }); } }
Powerful SDKs Ease of Integration Extensibility Support all app types
Permission detection
Lightweight
Binary Size
Binary Size
3rd Party Library Mindfulness
3rd Party Library Mindfulness
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
3rd Party Library Mindfulness PROTOBUF KB OURS KB
Dalvik Method Count
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
Dalvik Method Count > git clone
[email protected]
: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
Minimize Network Usage
Network Usage 10X SMALLER 100X FASTER XML PROTOBUF
Reduce Startup Time
Startup Time Thread.start(); Executors.newSingleThreadExecutor();
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; } }
Lightweight SDKs Binary size 3rd party library mindfulness Dalvik Method
Count Network usage Startup time
Lightweight Powerful
Questions? dev.twitter.com @tsmith