Supporting multi screen in android
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Supporting multi screen in android



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Supporting multi screen in android Supporting multi screen in android Presentation Transcript

  • Supporting Multiple Screens in Android Android多屏幕适配
  • Preface Author:  Ren Fei. Android developer  Buding Mobile / Innovation Works Announcement:  本slide大量出现英文,都是我直接从原文copy/paste过来 的,英文水平有限也不知道该怎么翻,还望读者见谅。  本slide内容全部来自互联网,以及我自己的一点臆想,如 有错误,欢迎随便指出。
  • Origin of the problem 问题的由来
  • Fragmentation 上千种android设备。  不同的平台版本。  不同的屏幕尺寸、分辨率。  不同的输入方式。
  • Platform version From v1.5 to v4.1. 8 main version. 14 sub version.
  • Screen sizes 2.6" HTC G16 3.2" 3.7" HTC G5/G7 4.0" 4.3" Samsung i9000/9100 7.0" 7.7" 8.9" Samsung Galaxy Tab 10.1" Moto Xoom …..
  • Screen Resolution iPhone iPhone  320*480  640*960 iPad  1024*768  2048*1536
  • Screen Resolution Android QVGA 240*320 WQVGA 240*400 HVGA 320*480 WVGA 480*800 FWVGA 480*854 SVGA 600*800 DVGA 960*640 WSVGA 1024*600 WXGA 1280*768 qHD 540*960 HD 1280*720 ……
  • Screen RES. iPhone vs. Android
  • Android System Support Android系统支持
  • What does android do ?
  • Some definition Screen resolution  480*800 Screen size  3.7" Screen density  252dpi DPI(dots per inch), xdpi, ydpi  DPI= RES. / SIZE DIP (Density-independent pixel)  px = dp * (dpi / 160)
  • Generalized SIZE/DPI Hdpi/mdpi/ldpi/xhdpi Small/normal/large/xlarge
  • Generalized DPI definition ldpi (Low density) 120 dpi 0.75 mdpi (Medium density) 160 dpi 1 hdpi (High density) 240 dpi 1.5 xhdpi(Extra-high density) 320 dpi 2
  • Generalized SIZE definition xlarge screens are at least 960dp x 720dp. large screens are at least 640dp x 480dp. normal screens are at least 470dp x 320dp. small screens are at least 426dp x 320dp. (Android does not currently support screens smaller than this.)
  • Relationships RES. + SIZE  DPI  DPI = RES. / SIZE DPI  G.DPI  ? SIZE  G.SIZE  ?
  • Some model device RES. px SIZE DPI G.DPI RES. dp G.SIZE HTC wildfire 240*320 2.8 in 140dpi ldpi 320*428dp small HTC hero 320*480 3.2 in 180dpi mdpi 320*480dp normal HTC desire 480*800 3.7 in 252dpi hdpi 320*533dp normal Dell Streak 480*800 5.0 in 186dp mdpi 480*800dp largeHTC sensation 540*960 4.3 in 256dpi hdpi 360*640dp normal Galaxy note 800*1280 5.3 in 284dpi xhdpi 400*640dp normal HTC Flyer 600*1024 7.0 in 170dpi mdpi 600*1024dp large Galaxy tab 600*1024 7.0 in 170dpi hdpi 400*682dp normal Xoom 800*1280 10.1 in 150dpi mdpi 800*1280dp xlarge
  • DPI  G.DPI G.DPI mostly can be inferred from DPI But some G.DPI may be very different with the real dpi.  Samsung galaxy tab has HDPI, but its real dpi is 170. G.DPI, xdpi, ydpi are set by manufacturers. Manufacturer will choose a G.DPI to make its UI looks the best.
  • SIZE  G.SIZE Only SIZE is not enough to get G.SIZE. G.SIZE can be infer from the RES. in dp unit. RES.(px) + G.DPI  RES.(dp)  G.SIZE
  • Relationships RES. + SIZE  DPI DPI  G.DPI (mostly) G.DPI + RES.  G.SIZE
  • Effect of G.DPI Developers do not need to care about real density. Different RES.(px). are aggregated to RES.(dp), which has a much smaller range.  For example, some small/normal size device. device RES. px G.DPI RES. dp G.SIZE HTC wildfire 240*320 ldpi 320*428dp small HTC hero 320*480 mdpi 320*480dp normal HTC desire 480*800 hdpi 320*533dp normal HTC sensation 540*960 hdpi 360*640dp normal Galaxy note 800*1280 xhdpi 400*640dp normal
  • Density independence The Android system scales dp units and drawable res to appropriate size based on the G.DPI. For example, a Button(100*100dp) and a icon image will looks nearly the same in different devices.
  • Support general handset 如何支持普通手机?
  • Handset features Small and Normal devices take over 90%. These devices are nearly all handset.
  • Handset qualifier G.SIZE: small/normal Default Orientation: portrait RES.(dp): 426dp x 320dp - 640dp x 480dp.
  • How to support? Develop a scalable app.  Use wrap_content, fill_parent.  Use dp not px.  Use LinearLayout/RelativeLayout, not AbsoluteLayout.  Provide different drawables for different dpi.  Use more 9-patch drawable.  …
  • A simple demo 720*1280px 540*960px xhdpi 480*800px hdpi320*480px hdpimdpi
  • Support more devices (handset & tablet) 如何支持更多的设备?
  • The first guideline Develop one app for all devices.  There is no dividing line between handsets and tablets. Maintaining multi apps for different devices is not working well.
  • Official Guidelines Build your activity designs based on fragments Use the action bar Implement flexible layouts
  • Implement flexible layouts How to implement flexible layouts in one app?  Official answer: Think like a web designer.
  • Responsive web design Build something that works on any possible width or device instead of something that works on all current widths and devices. Use css3 media queries to implement. Usually combine with fluid web design.
  • Media queries Sample:  <link media="screen and (max-device-width: 800px)" href=“common.css" /> Media queries contain two components:  A media type. (screen, print)  A media feature(max-device-width) and query value(800px). Use media queries to filter css depend on device info.
  • Website demo design/ex/ex-site-FINAL.html Use 3 media queries to divide consistent width to 4 part. @media (max-width: 400px) @media (max-width: 600px) @media (min-width: 1300px)
  • Responsive mobile design Same content, same logical, but different representation. Use configuration qualifiers, especially screen size qualifiers to provide different layout for different devices.
  • Configuration qualifiers Screen Size:  Small/normal/large/xlarge Density:  Ldpi/mdpi/hdpi/xhdpi… Orientation:  Port/land Platform version:  V3/v4/v11/v13… Language:  En/fr…
  • New screen size qualifiers Smallest Width  sw600dp Available Width  w600dp Available height  h600dp
  • Web design vs Android design CSS vs Layout CSS pixel vs Dip Ems vs Sp CSS3 media query vs Configuration qualifiers Fluid web design vs Scalable design Responsive web design vs Responsive mobile design
  • App demos IOSched2011 IOSched2012 Google Play
  • IOSched2011 3 fragments 4 layouts
  • IOSched2011 layout/ layout-land/
  • IOSched2011 layout-xlarge-land-v11/ layout-xlarge-v11
  • IOSched2012 4 fragments 4 layouts
  • IOSched2012
  • IOSched2012 layout/ layout-land/
  • IOSched2012 layout-large-v11/ layout-large- land-v11/
  • Google Play Version: 3.4.4 4 layouts generic_details.xml
  • Google Play layout/ layout-land/
  • Google Play layout-w600dp-h540dp/ layout-w800dp- h540dp/
  • UI Design Patterns UI设计模式
  • Android UI design patterns A UI design pattern describes a general solution to a recurring question. Mature UI patterns have flexible layouts towards different devices. They are self-adaptive to multi- screen. Here we introduce some useful patterns.  Action Bar  Workspace  Dashboard  Slide navigation
  • Action Bar Replace the old TitleBar. Many functions:  Menu  Search  Navigation  Tab  Spinner  Up  Action Mode  Split Action Bar
  • Action Bar Navigation(Tab)
  • Action Bar Navigation(Spinner)/Split Action Bar/Action Mode
  • Action Bar
  • Workspace A scrollable TabView. Could combine with ActionBar.
  • Workspace
  • Dashboard Acted as the landing page and holds all main functions.
  • Dashboard
  • Slide navigation Could replace the Dashboard. Make the navigation easier. Appearance is better in tablets.
  • Slide navigation
  • Conclusion Density independence in android could handles most of work to adapt apps to each devices. What you should do is supporting flexible, dynamic layouts.(think like a web designer) Remember developing one app for all devices. Follow platform guideline and use more UI design patterns.
  • The EndThanks for watching
  • Contact 欢迎各种交流与切磋 @Renfei 期待你的加入,与布丁一起创造、成长! Welcome to Buding Mobile(布丁移动)
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