Consistency is Key - Working with a design system (Droidcon Italy)

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CONSISTENCY IS KEY Working with a design system Maria Neumayer - @marianeum

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Consumer Restaurant Rider

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Deliveroo

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What is a design system?

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Visual Styles

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Visual Styles UI Components

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Visual Styles UI Components Guidelines

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Consistency Faster scaling Prevents duplication Single source of truth

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Consistency Faster scaling Prevents duplication Single source of truth

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Consistency Faster scaling Prevents duplication Single source of truth

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Consistency Faster scaling Prevents duplication Single source of truth

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Material Design

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⁉

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Setting up a design system

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Consumer Restaurant Rider

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Consumer Restaurant Rider UiKit

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Git Submodules

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Subproject commit cb713…070 [submodule "android-common"] path = android-common url = [email protected]:deliveroo/android-common.git

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Private Maven Repository

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implementation "com.deliveroo.android:ui-kit:1.0.0"a repositories { maven { credentials { username 'user' password 'pw' } url 'url' } }

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./gradlew assembleRelease artifactoryPublish

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implementation “com.deliveroo.android:ui-kit:1.0.0"a

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implementation "com.deliveroo.android:ui-kit:1.0.1"a

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implementation "com.deliveroo.android:ui-kit:1.0.1"a ./gradlew assembleRelease artifactoryPublish A private Maven repository for Android in 30 min  Jeroen Mols

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Major Minor Patch 1.0.0

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Major Minor Patch 1.0.0

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Major Minor Patch 1.0.0

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Major Minor Patch 1.0.0

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repositories { mavenLocal() }a ./gradlew assembleRelease publishToMavenLocal

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repositories { mavenLocal() }a ./gradlew assembleRelease publishToMavenLocal

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Creating components

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#00ccbc

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<item name="android:minHeight">@dimen/button_height</item> <item name="android:paddingStart">@dimen/padding_sides</item> <item name="android:paddingEnd">@dimen/padding_sides</item> <item name="android:paddingTop">@dimen/padding_top_bottom</item> <item name="android:paddingBottom">@dimen/padding_top_bottom</item> <item name="android:foreground">?selectableItemBackground</item> <item name="android:stateListAnimator">@animator/button_animator</item> <item name="android:background">@drawable/button_bg_primary</item> <item name="android:background">@drawable/button_bg_secondary</item> <item name="android:textStyle">normal</item> <item name="android:textColor">@color/teal_120</item>

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<item name="android:background">@drawable/button_bg_green</item>

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<item name="android:background">@drawable/button_bg_green</item> <item name="android:background">@drawable/button_bg_red</item> <item name="android:paddingStart">@dimen/padding_small</item> <item name="android:paddingEnd">@dimen/padding_small</item> <item name="android:paddingTop">@dimen/padding_small</item> <item name="android:paddingBottom">@dimen/padding_small</item> <item name="android:minHeight">@dimen/button_large</item> ⁉

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setBackgroundResource(R.drawable.button_bg_secondary) setTypeface(typeface, Typeface.NORMAL) setTextColor(context.getColorR.color.teal_120))

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Wanted Result

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Result

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Styles + Easy to setup + Easy to extend - Less consistency - Might be restrictive Custom Views + Full control + Decide properties and restrictions - Harder to extend ⚖

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Button

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Button UiKitButton

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button.type = UiKitButton.Type.PRIMARY button.text = "Hello Droidcon Italy"

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var type: Type = Type.PRIMARY set(value) { field = value updateColours() } var text: CharSequence? get() = textView.text set(value) { textView.text = value } button.type = UiKitButton.Type.PRIMARY button.text = "Hello Droidcon Italy"

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Forces consistency Simpliﬁes the component

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Forces consistency Simpliﬁes the component

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Designers + Engineers need to be aware of limitations

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Simplicity Consistency Reusability

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Simplicity Consistency Reusability

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Simplicity Consistency Reusability

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