The Curious Case of Android Button - Yelp Engineering

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The Curious Case of Android Button Nicola Corti @cortinico [email protected]

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Yelp Mission Connecting people with great local businesses.

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About me Nicola Corti Android @ BizCore @cortinico Community Lover !✈

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CC-by hisgett

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Consistency First

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Quick Button’s History

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Skeuomorphic UI • Android 2.3 - iOS 6 • Easy of use

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Flat UI • Windows Phone 7 (2010) • iOS 7+ (2013) • Streamlined & lighter • Responsive UI

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Almost Flat (aka Flat 2.0) • Google Material Design (2014) • Shadows and  Subtle Gradients

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How to craft your buttons?

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Shape

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Rectangular Shadows Corners More about rounded corners: http://bit.ly/roundedcorner

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Credits: Material Design - Elevation & Shadows

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Key + Ambient = Result

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Brand Platform CC kevint3141

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Time to deep dive!

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What’s actually an Android Button?

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What’s actually an Android Button? java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳ android.widget.Button ↳ android.support.v7.widget.AppCompatButton

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What’s actually an Android Button? java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳ android.widget.Button ↳ android.support.v7.widget.AppCompatButton

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What’s actually an Android Button? java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳ android.widget.Button ↳ android.support.v7.widget.AppCompatButton

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What’s actually an Android Button? java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳ android.widget.Button ↳ android.support.v7.widget.AppCompatButton

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What’s actually an Android Button? java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳ android.widget.Button ↳ android.support.v7.widget.AppCompatButton

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What’s actually an Android Button? java.lang.Object (554) ↳ android.view.View (26488) ↳ android.widget.TextView (11969) ↳ android.widget.Button (182) ↳ android.support.v7.widget.AppCompatButton (187)

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Just a Button

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Just a Button

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Just a Button

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Just a Button

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Just a Button /** * *

This will automatically be used when you use {@link Button} in your layouts */ public class AppCompatButton extends Button implements TintableBackgroundView, AutoSizeableTextView {

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Just a Button /** * *

This will automatically be used when you use {@link Button} in your layouts */ public class AppCompatButton extends Button implements TintableBackgroundView, AutoSizeableTextView {

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Just a Button /** * … * *

This will automatically be used when you use {@link Button} in your layouts * … */ public class AppCompatButton extends Button implements TintableBackgroundView, AutoSizeableTextView {

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4 defaults styles for a Button

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4 defaults styles for a Button <style name="Widget.AppCompat.Button.Colored"/> <style name="Widget.AppCompat.Button.Borderless"/> <style name="Widget.AppCompat.Button.Borderless.Colored"/>

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4 defaults styles for a Button <style name="Widget.AppCompat.Button.Colored"/> <style name="Widget.AppCompat.Button.Borderless"/> <style name="Widget.AppCompat.Button.Borderless.Colored"/> API 21+

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4 defaults styles for a Button <style name="Widget.AppCompat.Button.Borderless"/> <style name="Widget.AppCompat.Button.Borderless.Colored"/> <style name="Widget.AppCompat.Button.Colored"/> <style name="Base.Widget.AppCompat.Button" parent="android:Widget.Material.Button"/> API 21+

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data/res/values/styles_material.xml

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data/res/values/styles_material.xml

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data/res/values/styles_material.xml <item name="background">@drawable/btn_default_material</item> <item name="textAppearance">?attr/textAppearanceButton</item> <item name="minHeight">48dip</item> <item name="minWidth">88dip</item> <item name="stateListAnimator">@anim/ button_state_list_anim_material</item> <item name="focusable">true</item> <item name="clickable">true</item> <item name="gravity">center_vertical|center_horizontal</item>

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data/res/drawable/btn_default_material.xml

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data/res/drawable/btn_default_material.xml

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data/res/drawable/btn_default_material.xml

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data/res/drawable/btn_default_material.xml

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Typography

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Typography • Use a verb • On Android, buttons are ALL CAPS • Principle of Least astonishment

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Typography

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Typography

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Typography

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Typography

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res/values/styles_material.xml

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res/values/styles_material.xml <item name="background">@drawable/btn_default_material</item> <item name="textAppearance">?attr/textAppearanceButton</item> <item name="minHeight">48dip</item> <item name="minWidth">88dip</item> <item name="stateListAnimator">@anim/ button_state_list_anim_material</item> <item name="focusable">true</item> <item name="clickable">true</item> <item name="gravity">center_vertical|center_horizontal</item> <item name="textSize">@dimen/text_size_button_material</item> <item name="fontFamily">@string/font_family_button_material</item>

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<item name="background">@drawable/btn_default_material</item> <item name="textAppearance">?attr/textAppearanceButton</item> <item name="minHeight">48dip</item> <item name="minWidth">88dip</item> <item name="stateListAnimator">@anim/ button_state_list_anim_material</item> <item name="focusable">true</item> <item name="clickable">true</item> <item name="gravity">center_vertical|center_horizontal</item> <item name="textSize">@dimen/text_size_button_material</item> <item name="fontFamily">@string/font_family_button_material</item> <item name="textAllCaps">true</item> <item name=“textColor">?attr/textColorPrimary</item>

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Hierarchy

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Hierarchy • First, define your color palette • Use contrast to define hierarchy • Primary: high • Negative: medium • Secondary: low

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Hierarchy

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Hierarchy <style name="Widget.AppCompat.Button.Colored"/> <style name="Widget.AppCompat.Button.Borderless"/> <style name="Widget.AppCompat.Button.Borderless.Colored"/>

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Hierarchy <style name="Widget.AppCompat.Button.Colored"/> <style name="Widget.AppCompat.Button.Borderless"/> <style name="Widget.AppCompat.Button.Borderless.Colored"/> API 23+

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Hierarchy <style name=“Widget.AppCompat.Button.Colored” parent=“Base.Widget.AppCompat.Button.Colored”/> <style name="Widget.AppCompat.Button.Borderless"/> <style name=“Widget.AppCompat.Button.Borderless.Colored"/> <style name=“Base.Widget.AppCompat.Button.Colored" parent=“android:Widget.Material.Button.Colored”/> API 23+

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data/res/values/styles_material.xml

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data/res/values/styles_material.xml ...

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data/res/values/styles_material.xml

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data/res/values/styles_material.xml <item name="background">@drawable/btn_colored_material</item> <item name="textAppearance">@style/ TextAppearance.Material.Widget.Button.Colored</item>

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data/res/values/styles_material.xml <item name="background">@drawable/btn_colored_material</item> <item name="textAppearance">@style/ TextAppearance.Material.Widget.Button.Colored</item>

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data/res/values/styles_material.xml <item name="background">@drawable/btn_colored_material</item> <item name="textAppearance">@style/ TextAppearance.Material.Widget.Button.Colored</item>

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data/res/values/styles_material.xml <item name="background">@drawable/btn_colored_material</item> <item name="textAppearance">@style/ TextAppearance.Material.Widget.Button.Colored</item>

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data/res/drawable/btn_colored_material.xml

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data/res/drawable/btn_colored_material.xml

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data/res/drawable/btn_colored_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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Secondary color? • Use a ThemeOverlay (XML only) • Use backgroundTint

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color

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Secondary Color <item name=“android:colorAccent">@color/red</item>

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Secondary Color <item name=“android:colorAccent">@color/red</item>

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All works fine but…? .isEnabled = false with ThemeOverlay with backgroundTint with ThemeOverlay with backgroundTint

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Secondary Color

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data/res/color/btn_colored_background_material.xml

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data/res/color/btn_colored_background_material.xml

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All works fine but…? • You need a ColorStateList  for the backgroundTint • Delegate creations of drawables/CSL  to a UtilClass

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Feedback

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Feedback • Buttons are alive! • They have states (ColorStateList/StateListDrawable) • Use Ripples (they handle states) • Animate Shadows (StateListAnimator)

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Credits: Vadim Gomov - Dribbble Z-Value = Elevation + TranslationZ

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Shadow

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Shadow

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Shadow

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Shadow

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Shadow Why?

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res/values/styles_material.xml

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data/res/anim/button_state_list_anim_material.xml

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data/res/anim/button_state_list_anim_material.xml

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data/res/anim/button_state_list_anim_material.xml

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp 0dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp 0dp

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data/res/anim/button_state_list_anim_material.xml 2dp + 6dp 2dp 0dp

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Takeaways

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Consistency first!

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Don’t be afraid to deep dive

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Buttons are alive!

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Thanks! CC-by hisgett

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We are hiring! www.yelp.com/careers/

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Nicola Corti @cortinico [email protected] @YelpEngineering github.com/yelp yelp.com/careers engineeringblog.yelp.com