One Size Fits All Sprint

8/14/2019 One Size Fits All Sprint

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Creating one APK for multiple screen

One Size Fits All

Tuesday, October 27, 2009


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That was then...



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...this is now...



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...this is now...



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...this is now...HVGA

QVGA

WVGA



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...what the future holdsHVGA

QVGA

WVGA



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...what the future holdsHVGA

QVGA

WVGA



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Agenda

Basics of multiple screens

What your application can do

What Android can do



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Multi Screen Basics



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Physical Size

QVGA HVGAWVGA



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Available Pixels

WVGA

QVGA

HVGA



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Resource resolution

$resource_type-$qualifier1-$qualifier2-...

drawable-normal-hdpidrawable-notlong-port-normal-ldpidrawable-fr-rCA-large-long-land-mdpi-finger-keyssoft



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Pardon the mess

Resource resolution

$resource_type-$qualifier1-$qualifier2-...

drawable-normal-hdpi-v4drawable-notlong-port-normal-ldpi-v4drawable-fr-rCA-large-long-land-mdpi-finger-v3



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Framework Goals

Present UI with physically consistent size

Reduce complexity for developers Help apps run on unforeseen screens

Allow full control if the app wants it



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Developer Goals

Build best app for every configuration

Crisp graphics Maximum use of screen space

Minimize of complexity



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Steps to optimization

AndroidManifest.xml: tell the system what you support

Provide custom drawables

Create custom layouts



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Telling Android what you support

AndroidManifest.xml



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Considering Density

QVGA HVGA WVGA



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What density are default resources?

Considering Density



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Considering size

Screen space grows slower than resolution

Adjust layouts to take advantage of screen space RelativeLayout can help here

Screen sizes: small, normal, and large



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SiP-ing and DIP-ing your way to success

Building good layouts

Take a !sp" from column A Considers screen density and user settings

And a !dip" in column B

Considers just screen density



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Working wtih UI dimensions in Java code

Pixel Math

import android.util.DisplayMetrics;...

private int dipsToPixels(int dipValue) {DisplayMetrics thisDisplay =

new DisplayMetrics();Float dipSize = new Float(

dipValue * thisDisplay.density);return dipSize.intValue();

}



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Just in case...

Ask not what Android can do

for you, ask what you can dofor Android.



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Resource pre-scaling

In the platform from day 1 Always happens

hdpi resource displayed on ldpi screen is 2X downsampled



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Resource pre-scaling

In the platform from day 1 Always happens

hdpi resource displayed on ldpi screen is 2X downsampled

mdpi resource scaled up 1.5X on hdpi screens



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Density compatibility

Creates the illusion of being on an mdpi screen FWVGA, hdpi screen will report 569x320

Can convert to physical pixels using DisplayMetrics.density



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Size compatibility Stretching for !similar" screens

Scaling to smaller screens

Letter boxing on larger screens



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Q&A

Documents

One Size Fits All Sprint