Salt march 2011-android development for different screens and devices

Android Development for Different Screens and Devices

Rohit Ghatol

About MeRohit Ghatol

1. Architect @QuickOffice2. Project Mgr @Synerzip3. Certified Scrum Master4. Author “Beginning PhoneGap” @Apress5. Founder TechNext Pune (Pune Developer

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Topics

• Understanding UI Terms and Concepts• Building for Different Screen Sizes• Building for Different Tablets and Phone• Getting ready for Ice Cream Sandwich• Making your app run on all devices• Reference Material

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Diversity on Android

Android Devices•Handsets•Tablets•TV

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Diversity on Android

• Screen– Screen Size (2 inch to 50 inch)– DPI (120 – 320 )

• Optional Hardware (Telephony, Camera, GPS)• User Interaction

– Touch, DPAD, Trackball, Keyboard

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Making App work for different Screens

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UI Terms and Concepts

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Screen Size

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Measured in Diagonal

SmallSmall

MediumMedium

LargeLarge

Extra LargeExtra Large

Categories

Screen Density

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CategoriesDPI – Dots per inches

Low Normal

High Extra High

Orientation

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Portrait Landscape

Density Independent Pixel (dp)

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160 DPI Screen 240 DPI Screen

1 dp = 1.5 pixels1 dp = 1 pixels

Range

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• 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

Density Independence

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px

dp

Building for Different Screen Sizes

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<supports-screen>

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Screen Compatibility Mode

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For Android 3.2 and above

Screen Compatibility Mode

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For Android 3.2 and above

Stretch to Fill Zoom to Fill

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Compatibility Modes

android:requiresSmallestWidthDp•Small Width Required for this application to be installed on the given device•Currently Android Market does not use it

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Compatibility Modes

android:compatibleWidthLimitDp•Small Width supported by the application.•If Smallest Side of Device > compatibleWidthLimitDp, user is offered to run application in Compatibility mode

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Compatibility Modes

android:largestWidthLimitDpSmall Width supported by the application.•If Smallest Side of Device > largestWidthLimitDp, application is forced run application in Compatibility mode (without any option)

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Different Layouts

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UI Guidelines

• Keep Business logic separate• Keep Views independent• Keep Navigation logic out of Views

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< Android 3.1

• layout-small• layout-normal• layout-large• layout-xlarge

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>= Android 3.2

• layout-sw600dp• layout-w720dp• layout-h500dp

25http://developer.android.com/guide/practices/screens_support.html#DeclaringTabletLayouts

Now you can declare which layout to use at which width and not more vague partitions like layout-small, layout-normal, layout-large and layout-xlarge

Different Bitmaps

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Drawable-Resolution

• drawable• drawble-nodpi – Not Scaled at all• drawable-ldpi ~ 120 dpi (.75x scale)• drawable-mdpi ~ 160 dpi (baseline scale)• drawable-hdpi ~ 240 dpi (1.5x scale)• drawable-xhdpi ~ 320 dpi (2x scale)

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Icon GuideLines

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As of Android 3.0, Options menu has been superseded by Action bar

For Android 3.0+

Menu Icons Guidelines

29For Android 2.3

Status Bar Icons

30For Android 3.0+

Status Bar Icons

31For Android 2.3

Nine Patch Images

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Nine Patch Images

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Shapes XML

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Best part is these are Density Independent

MultiResolution App

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Config Qualifier

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1. Mcc & mnc

2. Lang & Regionen,fr,en-rUS

3.Smallest WidthSw320dp,Sw600dp,sw720dp

4.Available WidthW720dp,w1024dp

5.Available HeightH720dp,h1024dp

6. ScreenSizesmall,normal,large,xlarge

7.Screen Aspectlong, notlong

8.Screen Orientport,land

9.Doc Modecar, desk

10.Night Modenight,notnight

11. DPIldpi,mdpi,ldpi,xldpi,tvdpi,nodpi

12.Touch Typenotouchstylusfinger

13.Keyboard Availabilitykeysexposedkeyshiddenkeyssoft

14.Primary Text Input Methodnokeysqwerty12key

15.Navigation key Availabilitynavexposednavhidden

16. Primary NonTouch Input Method

nonavdpadtrackballwheel

17. API Levelv3v4v7

How Android finds best resource?

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Available Resources

drawable/drawable-en/drawable-fr-rCA/drawable-en-port/drawable-en-notouch-12key/drawable-port-ldpi/drawable-port-notouch-12key/

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Device Configuration

Locale = en-GB Screen orientation = port Screen pixel density = hdpi Touchscreen type = notouch Primary text input method = 12key

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Step 1 Remove Contradictory Entry

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Step 2-5 Start Filtering

Locale = en-GB Screen orientation = port Screen pixel density = hdpi Touchscreen type = notouch Primary text input method = 12key

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22

88

1111

1212

1414

## Config Precedence order

Step 2- 5 Filter by Language

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Step 2-5 Filter by Orientation

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Building for Tablets & Handsets

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HoneyComb UI

New UI Elements•Fragments•Action Bar

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Before Fragments

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Before Fragments

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Let’s see some code

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Fragments Example

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ActionBar

Fragment

ListFragment

55Portrait Landscape

Afghanistan….Bhutan….Cuba….Germany


This Country is a Independent

State. The Capital is Kabul.



CountryList

CountryInfo







Activity

Fragment







CountryListFragment CountryInfoFragment

OnCountrySelectedListenerOnCountrySelectedListener

void onCountrySelect(int position)



CountryListFragment

OnCountrySelectedListenerOnCountrySelectedListener

void onCountrySelect(int position)

CountryListActivity

Country Select Event

Country Select Event

58Portrait Landscape







CountryList

CountryInfo







Activity

Fragment

Send Intent

Directly Tell Fragment


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ActionBar Example

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But all this is for > Android 3.x

Welcome Android Compatibility Pack

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Android Compatibility Pack

• Provides limited support for HoneyComb widgets for pre 3.0 Android devices

• Support for Fragments present (with some api change)

• No Support for ActionBar

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Fragments on Android 2.x

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What about ActionBar Support for Android 2.x

Welcome ActionBarSherlock

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ActionBarSherLock Example

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Getting ready for Ice-cream sandwich

http://android-developers.blogspot.com/2011/09/

preparing-for-handsets.html

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What happens to Honey Comb Apps?

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Make Apps Tablets Only Support Smaller Screens

Make Apps Tablet Only

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Support Smaller Screens

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Support Smaller Screens

• Keep Business logic separate• Keep Views(Fragments) independent• Keep Navigation logic out of Views

(Fragments)

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ActionBar on Smaller Screens

• Use ifRoom instead of “always”• Provide icons for all action items and use

showAsAction=“ifRoom|withText”.

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ActionBar on Smaller Screens

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ListViews

• Use different layouts for list items for– Tablets (show more information)– Handsets (show less information)

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Making App work on all devices

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Maximum Reach, Assume nothing

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Type/Capabilities

Telephony

2G/3G/4G

Wifi GPS Accelerometer/Compass

Camera

Phone Yes Yes Yes Yes Yes Yes

Tablets No Optional

Yes Yes Yes Yes

Google TV

No No Optional

No No Nohttp://www.google.com/events/developerday/2010/moscow/sessions/your-app-can-run-on-every-android.html

Use <uses-feature> judiciary

In the Application Manifest: <uses-feature>•For any hardware your app uses •For any hardware which your app does NOT need to execute, explicitly specify a value of required=false•(Remember TV does not have telephony,GPS or Camera)

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Currently available Features to be declared by<uses-feature>:(see PackageManager class)

• CAMERA• CAMERA_AUTOFOCUS• CAMERA_FLASH• LOCATION• LOCATION_GPS• LOCATION_NETWORK• MICROPHONE• SENSOR_COMPASS• SENSOR_ACCELEROMETER• SENSOR_LIGHT SENSOR_PROXIMITY

• TELEPHONY • TELEPHONY_CDMA • TELEPHONY_GSM TOUCHSCREEN

TOUCHSCREEN_MULTITOUCH • TOUCHSCREEN_MULTITOUCH_DISTI

NCT• WIFI • BLUETOOTH

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Feature availability at runtime

• PackageManager.hasSystemFeature(FEATURE_NAME)

• Check if feature present then only expose the feature to end user (like menu item for it)

• Build a Degradable App

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Q & A

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More about Me• Twitter - http://twitter.com/#!/rohitghatol • TechGig -

http://www.techgig.com/rohitghatol • LinkedIn -

http://www.linkedin.com/in/rohitghatol• Presentations -

www.slideshare.net/rohitsghatol/ • YouTube Tutorials -

http://www.youtube.com/user/rohitssghatol

Technology

Salt march 2011-android development for different screens and devices