The presentation on Japan Android Group Yokohama branch 15th meeting

1. Droidcon London 2012
Speaker体験談
「参加報告＋講演セッション短縮版」
2012/11/23
@korodroid（神原 健一）

2. 自己紹介
 氏名：神原 健一 @
 活動：iplatform.org（http://www.iplatform.org/）
 所属：NTTソフトウェア株式会社
主な活動（iplatform.org＠プライベート）
 Google Play向けアプリ開発（現在20本）
9 1
0
 Google Developer Day 2011 Tokyo 基調講演デモ
 Android Developer Lab Tokyo 2011 follow-up 5位入賞
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3. 目次
1.イベント概要
2.講演セッション抜粋版
3.その他トピック

4. 1.イベント概要

5. Droidcon?
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6. Droidcon London 2012
 日時：2012/10/25（木）～26（金）
 場所：London（Business Design Centre）
 参加者1000人程度
 チケット：一般£200(その他：早期割引など)
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7. 会場
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8. 会場
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9. 会場受付
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10. フロア全体
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11. セッション会場
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12. Droidcon構成
Sessions
App Demos
Community Table
Party
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13. セッション一覧
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14. 2.講演セッション抜粋版

15. 担当セッション
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16. Droidcon London 2012
抜粋版
（Start）
Developing Apps
for Android on 2.x/3.x/4.x
Kenichi Kambara (@korodroid)
October 26, 2012

17. Agenda
•Introduction
•Background
•Android Fundamentals
•Application Development Tips

18. My session topics
Some tips on developing Apps
for multi versions and multi devices.
2.x 3.x 4.x
Handsets Tablets

19. What is “Sekai Phone”?
Real time translation phone services
(Supports Android 2.x/3.x/4.x & multi devices)
)
English German
Japanese
○ ○
○
Italian
French
○ ○ Chinese
Publishe Date: Jan, 2010, over 20+ ver.up

20. Use Case (1)
Phone mode
(Auto translating to receiver’s native language)
English Japanese
Hello!
Talking Konnichiwa!
Talking
Paul Kenichi
Thanks! Arigatou!

21. Use Case (2)
Talk mode
(Auto translating on the spot)
English Japanese

22. Background

23. Platform Versions?
Honeycomb
ICS
JB
Gingerbrea
Others
d
Froyo
This data by Google on October 1, 2012
In my App:
Main Target: Android 2.2+ (2.2,2.3,3.x,4.x)

24. Screen Sizes & Densities?
This data by Google on October 1, 2012
In my App:
(normal,large,xlarge)x(mdpi,hdpi,xhdpi)

25. Android Fundamentals
省略

26. Application Development Tips

27. Support multi versions and multi
devices?
1.Designing User Interface
 Screen size
 Screen density
 Screen orientation
…
2.Using APIs
 Fragment
 Menu
…

28. 1. Designing User Interface
[Some Approaches]

29. [UI]1st Approach
Using layout-small/normal/large/xlarge
Screen Size
Classification
 Supports Android 1.6+
 Both 7” tablet and 5” handset mapped to “large”
 Pre 3.0 some devices mis-classified

30. [UI]2nd Approach
Using sw<N>dp,w<N>dp,h<N>dp
(a)layout-sw600dp Width & Height ≥ 600dp
(b)layout-w720dp Width ≥ 720dp
(c)layout-h480dp Height ≥ 480dp
 Recommended by Google
 Supports only Android 3.2+
Note: Effect by Screen Orientation

31. [UI]3rd Approach
Combination of 1st and 2nd
 res/layout-sw600dp/main.xml <- 3.2+ tablets
 res/layout-xlarge/main.xml <- 3.0/3.1 tablets
 res/layout/main.xml <- The others (Handsets)
 Supports Android 1.6
 Supports many devices (compared to 1st or 2nd)
 Any Problem?

32. [UI]4th Approach
Based on 3rd , plus some tips
• Put minimum requirement
for layouts

33. [UI]4th Approach
Based on 3rd , plus some tips (Layout Aliases)
// for Tablets
<resources>
<item name "main_layout" type="layout">
@layout/main_twopanes
</item>
<bool name="has_two_panes">
true
</bool>
</resources>

34. [UI]4th Approach
Based on 3rd , plus some tips (Layout Aliases)
// for Tablets
<resources>
<item name "main_layout" type="layout">
@layout/main_twopanes
</item>
<bool name="has_two_panes">
true
</bool>
</resources>
boolean hasTwoPanes =getResources().
getBoolean(R.bool.has_two_panes);
if (hasTwoPanes)
…
• Simple Java codes

35. 2.Using APIs?
[Some Points]

36. [API]Effect by AndroidManifest
On Android 2.x / 3.x / 4.x
Min Target 2.x 3.x 4.x
Sdk Sdk
Pattern 1 - -
Pattern 2 8 8
Pattern 3 8 16
4.x
2.x 3.x

37. [API]Multi-Versioning
Development?, Management?, APK Size?
Single APK Multiple APK
In my App:
Developed by Single APK

38. [API]Multi-Versioning
How to use the newest API on Single APK
Reflection Well known approach
Lazy loading One of Design Patterns
抜粋版
（End）

39. 3.その他トピック

40. Session①
“The Fragment Transition”
Chariot Solutions: Corey Latislaw
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41. Session②
“Fast, user-friendly and power-
efficient network
communication on Android”
Sony Mobile: Erik Hellman
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42. Session③
“Test Automation from
testdroid”
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43. 展示①
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44. 展示②
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45. 展示③
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46. App Demos ①
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47. App Demos ②
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48. App Demos ③
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49. 参加者パーティ
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50. 講演者パーティ
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51. Closing
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52. 関連URL
•Droidcon
http://droidcon.com
•Droidcon London 2012
http://uk.droidcon.com
•Droidcon London 2012 担当セッション
http://t.co/nMBfj4VR
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53. おまけ①
Androidプログラミング入門改訂２版
• 発売日:2012年8月31日
• 出版社:アスキーメディアワークス
• 著者:
- 江川崇
- 神原健一
- 山田暁通
- 佐野徹郎
- 郷田まり子
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54. おまけ②
Android APIプログラミングリファレンス
• 発売日:2012年11月30日（予定）
• 出版社:マイナビ
• 著者:
- 高見知英
- 菅野祥礼
- 神原健一
- 茶圓亮
- 松岡謙治
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55. Thank you!
•Facebook:http://fb.com/kanbara.kenichi
•Google+:+Kenichi Kambara
•Twitter:@korodroid
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