Demystifying Android Design

•

1 like•628 views

This document provides an overview of some key aspects of Android development including: 1. There is significant device fragmentation in Android, with over 11,000 distinct devices seen in 2013. 2. Android uses code names for version releases in alphabetical order. The most recent versions are KitKat and L. 3. There are different pixel densities that developers must account for, including mdpi, hdpi, xhdpi and xxhdpi. Proper asset organization and naming is important to support different densities.

Design

Demystifying Android
The Basics
!
LinkedIn UED Ofﬁce Hours
June 10, 2014
!
Rob Schill

Device Fragmentation
11,868 distinct Android devices seen in 2013

Android Releases
!
A (alpha)
B (beta)
Cupcake
Donut
Eclair
Froyo (frozen yoghurt)
Gingerbread
Honeycomb
Ice Cream Sandwich
Jelly Bean
KitKat
L?

JellyBean
KitKat
Froyo
Gingerbread
Honeycomb
Ice Cream
Sandwich
Installations

mdpi
1x
hdpi
1.5x
xhdpi
2x
xxhdpi
3x
Non-Retina
1x
Retina
2x
Pixel Density

mdpi
medium density
hdpi
high density
xhdpi
extra high density
xxhdpi
extra extra high density
Samsung Galaxy SIII HTC OneGoogle Nexus SLG Optimus S
Examples of Screen Densities

xhdpi
xxhdpi
ldpi
mdpi
hdpi
tvdpi
Distribution

Spacing & Density Independent Pixels (dp)
1 pixel = 1 dp

Typographic Scale - sp (scale independent pixels)
Text Size Micro
Text Size Small
Text Size Medium
Text Size Large
12sp
14sp
18sp
22sp
1 pixel = 1 sp

File Naming
Asset Type Preﬁx Example
Icons ic_ ic_star.png
Launcher Icons ic_launcher ic_launcher_calendar.png
Action Bar Icons ic_menu ic_menu_archive
Status Bar Icons ic_stat_notify ic_stat_notify_msg.png
Tab Icons ic_tab ic_tab_recent.png
Dialog Icons ic_dialog ic_dialog_info.png

File Naming
State Sufﬁx Example
Normal _normal btn_order_normal.9.png
Pressed _pressed btn_order_pressed.9.png
Focused _focused btn_order_focused.9.png
Disabled _disabled btn_order_disabled.9.png
Selected _selected btn_order_selected.9.png

Directory Structure
rating_favorite
drawable-mdpi
drawable-hdpi
drawable-xhdpi
ic_action_favorite.png
drawable-xxhdpi

drawable-mdpi
drawable-hdpi
drawable-xhdpi
ic_action_favorite.png
drawable-xxhdpi
ic_action_favorite.png
ic_action_favorite.png
ic_action_favorite.png

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Demystifying Android Design

1. Demystifying Android The Basics ! LinkedIn UED Ofﬁce Hours June 10, 2014 ! Rob Schill

3. Device Fragmentation 11,868 distinct Android devices seen in 2013

4. Android Releases ! A (alpha) B (beta) Cupcake Donut Eclair Froyo (frozen yoghurt) Gingerbread Honeycomb Ice Cream Sandwich Jelly Bean KitKat L?

5. JellyBean KitKat Froyo Gingerbread Honeycomb Ice Cream Sandwich Installations

6. Density

7. Non-Retina 1x Retina 2x Pixel Density

8. mdpi 1x hdpi 1.5x xhdpi 2x xxhdpi 3x Non-Retina 1x Retina 2x Pixel Density

9. mdpi 1x hdpi 1.5x xhdpi 2x xxhdpi 3x Non-Retina 1x Retina 2x Pixel Density

10. mdpi medium density hdpi high density xhdpi extra high density xxhdpi extra extra high density Samsung Galaxy SIII HTC OneGoogle Nexus SLG Optimus S Examples of Screen Densities

11. xhdpi xxhdpi ldpi mdpi hdpi tvdpi Distribution

12. Independence

13. Spacing & Density Independent Pixels (dp) 1 pixel = 1 dp

14. Typographic Scale - sp (scale independent pixels) Text Size Micro Text Size Small Text Size Medium Text Size Large 12sp 14sp 18sp 22sp 1 pixel = 1 sp

15. Default Typeface

16. Naming

17. File Naming Asset Type Preﬁx Example Icons ic_ ic_star.png Launcher Icons ic_launcher ic_launcher_calendar.png Action Bar Icons ic_menu ic_menu_archive Status Bar Icons ic_stat_notify ic_stat_notify_msg.png Tab Icons ic_tab ic_tab_recent.png Dialog Icons ic_dialog ic_dialog_info.png

18. File Naming State Sufﬁx Example Normal _normal btn_order_normal.9.png Pressed _pressed btn_order_pressed.9.png Focused _focused btn_order_focused.9.png Disabled _disabled btn_order_disabled.9.png Selected _selected btn_order_selected.9.png

19. Directory Structure rating_favorite drawable-mdpi drawable-hdpi drawable-xhdpi ic_action_favorite.png drawable-xxhdpi

20. drawable-mdpi drawable-hdpi drawable-xhdpi ic_action_favorite.png drawable-xxhdpi ic_action_favorite.png ic_action_favorite.png ic_action_favorite.png

21. Notiﬁcations

22. Back Button

23. Iconography

24. Don’t use bottom tab bars

25. Don't use labeled back buttons on action bars

26. Don't use right-pointing carets on line items