Android 1.5~8.0 Update history.

1. ANDROID 1.5~8.0
WALKTHROUGH
Matsumura.Yuki / 松村勇輝
AbemaTV, Inc. - Android Engineer Yuki_312

2. Smarter, faster and more powerful than ever.
The world's favorite cookie is your new favorite Android release.
Introducing Android 8.0
Android Oreo

3. <uses-sdk
android:targetSdkVersion=”25” />
“26”

4. Reduce Resource Consumption
‣ Doze and AppStandby
‣ Background limitations (Broadcast, Service, Location)

5. Design Principles: Bg. Activity
referenced https://developer.android.com/topic/performance/scheduling.html
‣ Reduce all background job
‣ Defer it to when device is on charger
‣ Coalesce it with other background job

6. DOZE PJ.SVELTE
18%50%100%0
25
50
75
100
OS
N
K
L
M
Bg. Activity limitations

7. And more…

8. CUPCAKE
OS1.5, API LV.3
‣ April 2009
‣ On screen keyboards
‣ Bluetooth A2DP
‣ AppWidgetProvider, etc.

9. DONUT
OS1.6, API LV.4
‣ September 2009
‣ Screen size diversity
‣ Battery usage indicator
‣ New Android Market UI
‣ Text-to-speech engine, etc.

10. ECLAIR
OS2.0/2.1, API LV.5~7
‣ October 2009
‣ Service API deprecated
‣ Executed on Key-up
‣ Multi-touch, Multi-account
‣ Google account sync, etc.

11. 2.0 - E
Service
‣ Service.setForeground() deprecated
‣ Add startForeground(), Required Notification icon
8.0 - O
‣ Background service limitations
‣ Add startForegroundService()

12. F.JOBDISPATCHER JOBSCHEDULER
78%100%100%0
25
50
75
100
OS
N
K
L
M
Service

13. FROYO
OS2.2, API LV.8
‣ May 2010
‣ Install on external storage
‣ Backup Manager
‣ C2DM
‣ JIT compiler, etc.

14. GINGERBREAD
OS2.3, API LV.9/10
‣ December 2010
‣ Word selection
‣ Power management
‣ Concurrent GC
‣ NFC, etc.

15. 2.2 - F
Performance
‣ Dalvik + JIT compiler
5.0 - L
‣ ART
2.3 - G
‣ Concurrent GC
7.0 - N
‣ ART + JIT Compiler

16. ART
78%100%0
25
50
75
100
OS
N
K
L
M
Performance

17. HONEYCOMB
OS3.X, API LV.11/12/13
‣ February 2011
‣ New UI design for tablets
‣ ActionBar, Fragment, Loader
‣ Hardware acceleration
‣ Holographic UI, etc.

18. ICE CREAM
SANDWICH
OS4.0, API LV.14/15
‣ October 2011
‣ Unified UI framework
‣ MENU hardware button, etc.

19. JELLY BEAN
OS4.1~4.3, API LV.16~18
‣ June 2012
‣ Project Butter
‣ Unicode6.0
‣ Notification styles, GCM, etc.
‣ Google Play Services v1.0

20. 4.3 - J
Emoji
‣ Unicode6 emoji
6.0 - M
‣ Unicode7 & 8
‣ ZWJ
5.0 - L
‣ “nonhuman” shape
7.0 - N
‣ Unicode 9
‣ “Human” shape & Skin tones

21. UNICODE6 UNICODE7/8 UNICODE9
18%50%94%100%0
25
50
75
100
OS
N
K
L
M
Emoji

22. KITKAT
OS4.4, API LV.19
‣ October 2013
‣ Support 512MB RAM device
‣ Storage Access Framework
‣ Inexact Alarm
‣ Chromium WebView, etc.

23. 4.4 - K
Alarm
‣ Alarm delivery is inexact
‣ Add setWindow(), setExact()
6.0 - M
‣ Deferred to the next maintenance window
‣ Add setAndAllowWhileIdle(), setExactAndAllowWhileIdle()

24. LOLLIPOP
OS5.0/5.1, API LV.21/22
‣ October 2014
‣ Project Volta
‣ Material Design, Vector drawable
‣ Notification update, Multi-user
‣ WebView update, ART, 64bit etc.

25. 4.4 - K
WebView
‣ Based on Chromium
7.0 - N
‣ Chrome APK
5.0 - L
‣ Updatable from Google Play
8.0 - O
‣ Multi process mode
‣ Safe Browsing

26. CHROMIUM UPDATABLE
78%93%100%0
25
50
75
100
OS
N
K
L
M
WebView

27. MARSHMALLOW
OS6.0, API LV.23
‣ October 2015
‣ RuntimePermissions
‣ Doze
‣ App Standby
‣ AutoBackup, etc.

28. 6.0 - M
Doze
‣ Screen off, on battery, stationary
7.0 - N
‣ Doze Lite
‣ Screen off, on battery, NOT stationary

29. DOZE
50%100%0
25
50
75
100
OS
N
K
L
M
Doze

30. NOUGAT
OS7.0/7.1, API LV.24/25
‣ August 2016
‣ Multi-window, Screen zoom
‣ Doze Lite
‣ File security
‣ Project Svelte, Round Icon, etc.

31. 4.3 - J
App Icon
‣ Mipmap resource
8.0 - O
‣ Adaptive icon
7.1 - N
‣ Round icon

32. OREO
OS8.0, API LV.26
‣ August 2017
‣ Background execution limits
‣ Notification dots, Adaptive icon
‣ XML font
‣ Application overlay, etc.

33. Intelligent Job-Scheduling
Scheduling this work intelligently can improve your app’s performance,
along with aspects of system health such as battery life.
referenced https://developer.android.com/topic/performance/scheduling.html

34. Be smarter, faster and more powerful than ever.
Let's make your app with 8.0 :)
Follow the new features
Androider

35. References
Migrating to WebView in Android 4.4:
https://developer.android.com/guide/webapps/migrating.html
Best Practices for Background Jobs:
https://developer.android.com/training/best-background.html
ART and Dalvik:
https://source.android.com/devices/tech/dalvik/
Getting Your Apps Ready for Nexus 6 and Nexus 9:
https://android-developers.googleblog.com/2014/10/getting-your-apps-ready-for-nexus-6-and.html
Android Emoji Changelog
https://blog.emojipedia.org/android-50-emoji-changelog/
https://blog.emojipedia.org/android-6-0-1-emoji-changelog/
https://blog.emojipedia.org/android-7-0-emoji-changelog/
https://blog.emojipedia.org/android-8-0-emoji-changelog/

36. References
Background Optimizations:
https://developer.android.com/topic/performance/background-optimization.html
Stuck Wake Locks:
https://developer.android.com/topic/performance/vitals/wakelock.html
Excessive Wakeups:
https://developer.android.com/topic/performance/vitals/wakeup.html
Optimizing for Battery Life:
https://developer.android.com/topic/performance/power/index.html
Intelligent Job-Scheduling:
https://developer.android.com/topic/performance/scheduling.html
Scheduling Repeating Alarms:
https://developer.android.com/training/scheduling/alarms.html

37. References
Chrome Custom Tabs:
https://developer.chrome.com/multidevice/android/customtabs
Android Compatibility Definition Document:
https://source.android.com/compatibility/cdd

38. Thank You!
Matsumura.Yuki / 松村勇輝
AbemaTV, Inc. - Android Engineer Yuki_312