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The Rounds ProjectGrowing from thousands to millions Tips and tricks from the battlefield

What is Rounds?

What is Rounds?

Fun, eyecandy, social, viral, useful Thank you Product Team!

Scalable, fast, reliable, predictable backend Thank you Server Team!

Great Client sideThats us! The Rounds Android TeamYohay, Berry, Shay, Vadim and growing...

The Key for a Great App

Supporting as many devices, OS versions and languages as possible

Robust, Crash-free app

Responsive UI, using latest guidelines

Surprise & Delight the user

Great Client Side

Android 4.03 and above

Only about 8% of users use Froyo, Gingerbread & below

so...we only support 4.03 and above (release quicker, use newer features).

Support 24 languages

For common iOS & Android translations

Support 7130 devices

QA? Code Reviews In house test most popular devices Applause for testing all over the world TestFairy for usability videos

Support 7130 devices

Release:Start with 20% rolloutCrashlytics for amazing crash analyticsIncrease after a few days

Responsive UI ?

Used new Thread() every time Oh no! Dont do that!!

Used synchronized on UI thread Argh! Blocked it and got nasty ANRs!

Fetched again the same info from server Users had to wait

Use a ThreadPool!

Changed every call ofnew Thread(someRunable).start();

ToRoundsExecutor.get().execute(someRunable);

And the resultWith a few hours workAmazing improvement in performance!

public class RoundsExecutor {

private static ExecutorService sPool = Executors.newCachedThreadPool();

public static ExecutorService get() {return sPool;}private RoundsExecutor(){ }}

synchronized, do you really need it? avoid it completely on UI thread if yes code review anyway

pay attention where you are running.if it is a callback then who is calling?

Parallel Threads Beware

IntentService

Creates a single background thread Will process only one task at a time Send the service an intent with what to do

Use LocalBroadcastManager to broadcast event with result

Use a BroadcastReceiver to handle result on UI thread

Managing Data

ModelView

Controller

Managing Data

ModelPersist LocallyNotify when changedServersUI Widgets

Activity orFragment

Fetch from Server

Managing Data

ModelPersist LocallyNotify when changedServersUI Widgets

Activity orFragment

Fetch from ServerPersist in Server

Managing Data

ModelPersist LocallyNotify when changedServersUI Widgets

Activity orFragment

Fetch from ServerGCM / XMPP PushPersist in Server

Managing Data

ModelPersist LocallyNotify when changedServersUI Widgets

Activity orFragment

Fetch from ServerGCM / XMPP PushPersist in Server

Persisting Data

SharedPreferences for simple dataSQLLite for more complicated dataUniversalImageLoader for images

We wanted an IntentService that wouldreschedule tasks that failed schedule tasks for laterstay alive until we asked it to stop

github.com/berryve/rounds-android-goodies

FlexibleIntentService

Any component can broadcast events using LocalBroadcastManager

Any component can declare events it is interested in and how to handle thempublic interface RoundsBroadcastListener {public String [] getInterests();public void handleRoundsEvent(String action, Bundle extras);}

Event Pipeline

We developed our handler mHandler = new RoundsEventHandler(context, roundsBroadcastListener)

Base classes that implement the listenerAnd use our handlerRoundsActivityBase RoundsFragmentBase

Event Pipeline

Start listening at onResume()mHandler.registerReceivers();

Stop listening at onPause()mHandler.unregisterReceivers();

github.com/berryve/rounds-android-goodies

Event Pipeline

Surprise & Delight

yeti_eyes.xml

etc

How to make a Yeti Blink

How to make a Yeti Blink

create an animation-list xml resourcethat references frame by frame eye images

Variate duration values To mimic live object Random can be better!

On the ImageView you want to animate:yetiEyes.setBackgroundResource(R.drawable.yeti_eyes)

How to make a Yeti Blink

To start the animation on yetiEyes ImageView

AnimationDrawable eyesAnimation = (AnimationDrawable)yetiEyes.getBackground();

eyesAnimation.start();

Summary

Make great product that people want to useKeep basic design principles in mindUse tools & services for crash free appAdd Fun Surprises & DelightsCant get it perfect the first timeKeep learning and improve as you go

Thank You!berry@rounds.com | yohay@rounds.com