Friday, February 28, 2014

[conference] Google Developers Summit 2014

Google Developers Summit 2014
COEX Grand Ballroom 104, 105
February 26, 2014 1PM~6:30PM
Ryosuke Matsuuchi, Mickey Kim, et al.
Google Korea
Android design guideline, Chromecast API, Google Play utilization

I.       Android design guideline [Chansuk Yang, Developer Relations]
1.       Message
1)      Basic advice
  targetSDK>19 (meaning use the most recent)
  change support package level to support minimum Android OS level
2)      What’s new in KitKat
  Home menu button: use app launcher icon as home menu button
  Visual design: when design, comply with people’s mental model so users don’t need to learn something new
  Two gestures: for zooming in and out, double touch or double touch drag
  Full screen mode: lean back mode (touching the screen in any way will bring navigation and notification bar back into place.), immersive mode (swiping down from the top or up from the bottom will bring notification bar or navigation bar respectively)
3)      Android design pattern
  Action Bar: app icon, view control, action buttons, action overflow
A       Suggestion: Android doesn’t recommend customized Action Bar
  Up and back difference
A       Up: higher category
B       Back: previous page or closing a pop-up window
  App structure
A       Tab: fixed and scrollable tabs; needs to be located at the top of the screen; needs to support swiping
B       Navigation Drawer: system bar needs to stay
  Dialogue and Toast principle
A       Principle
l  How much impact will the action bring to users? E.g. purchase brings a great impact
l  Does it allow users miss-click?
l  Can the result of the action returnable?
l  Sufficient user feedback to users? E.g. Facebook’s like button
B       Example: closing an app-> taking too much time-> consider using Dialogue window
  Notification: utilize expand and contract option
4)      Responsive design
  Need to support tablet
  Use DP (density-independent pixels) (e.g. 200 dp)
  Resource qualifier- provide different size icons

2.       Takeaway
1)      targetSDK>19 (meaning use the most recent)
2)      Home menu button: use app launcher icon as home menu button

II.      Chrome WebView Essentials [Alex Danilo, Developer Advocate]
1.       Message
1)      What does this mean?
  New capabilities:
A       indexedDB: important technology to store data (e.g. games)
B       Web Sockets: push data back and forth client and server
C       requestAnimationFrame: synchronize animation on screen (not wasting time compared to JavaScript)
D       SVG filters and Effecs: e.g. convolution blurs
E       H/W accelerated rendering (e.g. <canvas>)
  Debugging Features: Analyzing web traffic, monetizing
  Hybrid applications: Use native component, interfacing JavaScript to native
  Compatibility mode: Use targetSDK>19
  Multi-threading and thread blocking
  Custom URL Handling: URLs must conform to RFC 3986
  Viewport Changes
  Styling Changes
  Sizes are in CSS pixels instead of screen pixels
2)     Best practices
  Set SDK version to 19: <uses-sdk android:targetSdkVersion=”19”.>
  Enable hardware acceleration: <application android:hardwareAccelerated=”true” ..>
  Enable Debugging: WebView.setWebContentsDebuggingEnabled(true);
3)      The Future: Web RTC (real-time communication; P2P communication; e.g. Google Hangouts is coming

2.       Resources
1)      documentation:,
2)      samples:
3)      twitter: @alexanderdanilo; g+

III.     New AdMob- profitability, convenience and control [Siyoung Choi, PBS AdMob Lead]
1.       Message
1)      Best practice
  Why it got popular:
A       YouTube video review (subscription 3 M)
B       Review: ## reviews
C       Community BBS
D       Siyoung’s insight: Low requirement, short game time, free
  Ways to purchase mobile app contents: Freemium, in-app purchase, download
  수익= 매출 - 비용
A       운영서버, 퍼블리싱, 분석도구, 마케팅채널, 보안솔루션, 결제솔루션
B       매출: DL x재방문율x결제율x ARPPU
C       매출 결정 변수: 마케팅x In app 설계x service balance x결제지원수단, 개인별 결제 한도
  모바일 광고: 사용자는 돈을 내지 않고 광고주가 대신 지불+손쉬운 적용, 안정적 수익, 적은 투자
2)      AdMob 특장점
  Reach and scale: Google Play global target, localization languages
  Innovative ads: 전면 동영상 등 creative
  High fill-rate: traffic이 수익화에 적용
3)      광고 수익의 규모는
  계산: 10M user, 노출율 90%, CPC 100 KRW, xxx -> 9M KRW
4)      New AdMob
  편의성: 빨라진 지급주기, 앱 개발자에게 최적화 된 UI (수익화/홍보 지원), 앱 업데이트 없이 mediation, house ad 적용
  수익성: 전환최적화 기능 (자동으로 단가 최적화), 수익 극대화 (mediation 활용- Optimize AdMob Network)
  컨트롤: 세분화된 필터링 (140여개 예. 경쟁사 광고 제외), 광고 심사 센터
5)      광고 수익화를 위한 적용 Tip  
  Refresh rate: 30~60 seconds
  광고와 컨텐츠의 경계
  Smart banner 사용: portrait <-> landscape
  전면광고: 사용자 별로 노출횟수 조절, 사용자가 즐거울 때, user flow 끊기는 지점, 호출과 노출분리, 최신 SDK 사용, Google Analytics 사용

2.       Takeaway
1)      Request to convert to New AdMob at
2)      광고 수익화를 위한 적용 Tip
  Refresh rate: 30~60 seconds
  광고와 컨텐츠의 경계할 것
  Smart banner 사용: portrait <-> landscape
  전면광고: 사용자 별로 노출횟수 조절, 사용자가 즐거울 때, user flow 끊기는 지점, 호출과 노출분리, 최신 SDK 사용, Google Analytics 사용

IV.    Chromecast [Mickey Kim, Head of Asia Pacific, Chromecast]
1.       Message
1)      Lesson Google learned
  need setup experience to be easy
  need nothing new to learn
  need to support cross platforms and devices
  need to support second screen (smartphone, tablet, laptop)- because 77% of the time while watching a TV, second screen has been used; the bigger the screen, the more YouTube people watch
2)      setup process: plug in-> connect to Wi-Fi-> cast (bringing optimized resolution depending on screen size)
3)      benefit
  video and audio cast to TV
  Chrome web browser tab mirroring

2.       Takeaway
1)      Just add code from Cast SDK at into your smartphone, tablet and website
2)      Review the Cast UX requirements and integrate

V.      Google Cast SDK Overview [Chansuk Yang, Developer Relations]
1.       Message
1)      Download SDK at
2)      Google Cast 구성요소
  Sender Application:
  Receiver Application:
  Cast Device
  Streamiing media server
3)      Check out
  User Experience with Google Cast at
  Google Cast Design Checklist:
4)      Google Cast SDK 구성요소
  Sender SDK- Android (google Play Service), iOS (SDK), Chrome (JavaScript)
  Receiver SDK- Receiver Library & Media Player Library (JavaScript)
  Cast Developer Console
5)      시작하기
  Google Cast Developer Console 계정 등록- $5 onetime fee, receiver app/device registration and management
  Receiver app 등록: Ap ID 발급
  Cast Device 등록 (unlock)- 개발, 디버깅, 테스팅을 위해
6)      Sender Application: cast device 검색, receiver app 실행, 보안 채널 연결, UI control, media message sending, custom message sending
7)      Receiver application: 단순 웹 어플리케이션, 컨텐츠를 표시하기 위한 인터페이스 제공, 미디어 컨텐츠를 컨트롤 하기 위한 메시지 수신 및 처리, 앱에 특화된 사용자 정의 메시지 수신
8)      Receiver application 종류: default receiver, styled receiver (CSS 만 등록), custom receiver,
9)      Supported media: most open format
10)    Google Cast Sample apps:
11)    Stack Overflow: #google-cast

2.       Takeaway
1)      Include Chrome Cast in your app