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ConstraintLayout 2.0 Nicolas Roard @camaelon John Hoford @johnhoford

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Why

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ConstraintLayout 1.x Flat hierarchy : decouple layout from the view hierarchy Support library Powerful internal engine Design Tools : UI Builder

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When : some guidance Simplify layouts of components Build UI quickly What about LinearLayout / FrameLayout ?

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ConstraintLayout 2.x Flexibility Virtual Layouts Helpers & Decorators Optimizer MotionLayout Design Tools : UI Builder, Motion Editor

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Motion Editor

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Motion Editor

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Architecture

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Architecture Linear Solver

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Architecture Constraints Model Linear Solver

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Architecture Linear Solver Constraints Model Optimizer

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Architecture Linear Solver Constraints Model Optimizer Virtual Layouts Helpers

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Architecture Linear Solver Constraints Model Optimizer MotionLayout Virtual Layouts Helpers

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ConstraintLayout

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Layout concepts Direct Constraints : relative, circular, dimensions (ratio…) Chains Helpers : Guidelines, Barriers, Layer… Decorators Virtual Layout Constraint Sets

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Helpers

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Encapsulate Behaviors ConstraintLayout utility Encapsulate a given behavior Apply it to a set of widgets ▸ Supported in Studio ▸ Can use View APIs (animation, etc.) in helpers to promote reuse

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Circular Reveal

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Circular Reveal

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@Override public void updatePostLayout(ConstraintLayout container) { super.updatePostLayout(container); if (mContainer != container) { int rad =(int) Math.hypot(mComputedMaxY - mComputedMinY, mComputedMaxX - mComputedMinX); Animator anim = ViewAnimationUtils.createCircularReveal(this, (int) mComputedCenterX-getLeft(), (int) mComputedCenterY-getTop(), 0, rad); anim.setDuration(2000); anim.start(); } mContainer = container; }

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@Override public void updatePostLayout(ConstraintLayout container) { super.updatePostLayout(container); if (mContainer != container) { int rad =(int) Math.hypot(mComputedMaxY - mComputedMinY, mComputedMaxX - mComputedMinX); Animator anim = ViewAnimationUtils.createCircularReveal(this, (int) mComputedCenterX-getLeft(), (int) mComputedCenterY-getTop(), 0, rad); anim.setDuration(2000); anim.start(); } mContainer = container; }

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Decorators

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public class MetaballsDecorator extends ConstraintHelper { public void updatePostLayout(ConstraintLayout container) { int[] ids = getReferencedIds(); final int count = ids.length; for (int i = 0; i < count; i++) { View view = container.getViewById(ids[i]); // do something } } @Override public void onDraw(Canvas canvas) { // do something } }

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Bottom Panel Decorator

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Bottom Panel Decorator

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Bottom Panel Decorator

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Bottom Panel Decorator

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Bottom Panel Decorator

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Bottom Panel Decorator

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Virtual Layouts

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MotionLayout

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MotionLayout Reflect and animate between multiple states of components Coordinating motion of multiple components Support nesting MotionLayout Drive custom views

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MotionLayout Reflect and animate between multiple states of components Coordinating motion of multiple components Support nesting MotionLayout Drive custom views

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MotionLayout Subclass of ConstraintLayout Gets its constraints from a separate xml file. Allows you to directly animate between two Constraint sets Extensive control of the Transition between the two Custom attributes — not just layout

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Motion concepts States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick A B

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Motion concepts States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick A B

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Motion concepts States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick A B

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States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick Motion concepts

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States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick Motion concepts

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States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick Motion concepts

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States (ConstraintSets) Transitions Keyframes Coordinate Systems OnSwipe/OnClick Motion concepts

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Organisation Layout file Views Helpers VirtualLayout MotionScene file OnSwipe Constraint KeyFrameSet Transition ConstraintSet

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Example

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Start & End

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Start & End

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Positioning

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Positioning

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Custom Attribute : color

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Custom Attribute : color

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Cycles

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Cycles

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How to use it?

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Coordinator Layout Collapsible Toolbar From GitHub

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Coordinator Layout Collapsible Toolbar From GitHub

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DrawerLayout From GitHub

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DrawerLayout From GitHub

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ViewPager From GitHub

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ViewPager From GitHub

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Coordination

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From GitHub Nested MotionLayout

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From GitHub Nested MotionLayout

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Start End MotionLayout 2 MotionLayout 1

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Chris Banes "I MotionLayout, creating complex UI animations is a breeze when you can define some keyframes and let MotionLayout handle the rest"

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Chris Banes "I MotionLayout, creating complex UI animations is a breeze when you can define some keyframes and let MotionLayout handle the rest"

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Cycles

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Key Cycles KeyTimeCycles & KeyCycles

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Key Cycles KeyTimeCycles & KeyCycles

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Key Cycle interpolation

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Monotonic splines • Less prone to overshoot • Needs to be differentiable and Integrable Typical Spline Monotonic Spline

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KeyCycle •Period - 1/pos across space •Offset - shifts the envelope •Attributes - set amplitude of wave

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KeyCycles

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KeyCycles

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KeyCycles Period

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KeyCycles Period

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KeyCycles Value

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KeyCycles Value

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KeyCycles offset

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KeyCycles offset

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KeyCycles waveShape

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KeyCycles waveShape

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KeyCycles multiple waves translationX translationY

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KeyCycles multiple waves translationX translationY

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KeyCycles multiple waves translationX translationY

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KeyCycles multiple waves translationX translationY

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KeyCycles multiple waves translationX translationY

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KeyCycles multiple waves translationX translationY

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KeyCycles imagination is the limit translationY rotation translationY rotation

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KeyCycles imagination is the limit translationY rotation translationY rotation

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Introducing CycleEditor • Explore the capabilities of KeyCycles • XML shown compatible with alpha3 • Features: • Graph multiple cycles • Simulate keyCycles effect on a button

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KeyTimeCycle •Period - 1/s (Hz) •Offset - shifts the envelope •Attributes - set amplitude of wave Same attributes as KeyCycle

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KeyTimeCycles Period (Hz) KeyTimeCycle Attribute translationX

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KeyTimeCycles Period (Hz) KeyTimeCycle Attribute translationX

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KeyTimeCycles (KeyPosition) Change the KeyPosition

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KeyTimeCycles (KeyPosition) Change the KeyPosition

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KeyTimeCycles (Attribute) Changing value of android:translationX

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KeyTimeCycles (Attribute) Changing value of android:translationX

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KeyTimeCycles Changing value of motion:waveOffset waveOffset

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KeyTimeCycles Changing value of motion:waveOffset waveOffset

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KeyTimeCycles Changing value of motion:waveShape

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KeyTimeCycles Changing value of motion:waveShape

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What’s new

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Alpha 3 MotionLayout

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alpha 3 New XML format KeyTimeCycle KeyTrigger

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Alpha 4 MotionLayout

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alpha 4 Richer behaviors for OnClick actions CustomAttributes support for customPixelDimensions ImageFilterView overlay support KeyTrigger collision support Attributes rename

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MotionLayout Alpha 5

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alpha 5 MotionTarget string matching OnSwipe regions Automatic transitions Derived ConstraintSets 


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Target Matching

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MotionTarget matching Two Tags: layout_constraintTag … Label a View motionTarget … Takes ID or Regular Expressions Apply one keyframe to many views

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layout_constraintTag & motionTarget In Layout…

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layout_constraintTag & motionTarget In Layout…

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layout_constraintTag & motionTarget In Layout… Or in MotionScene … />

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layout_constraintTag & motionTarget In Layout… Or in MotionScene … /> Now apply in MotionScene />

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Region Swipe

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Region Swipe Limiting Swipe to regions

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Region Swipe Limiting Swipe to regions

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dragDirection dragUp dragDown dragRight dragLeft touchAnchorId touchAnchorSide top bottom left right touchRegionId

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Example

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Example

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Auto Transition

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Auto Transition A B Transition

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Auto Transition A B Transition

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Auto Transition On start animation

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Auto Transition On start animation

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Auto Transition On start animation START Transition A B Transition

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Auto Transition "jumpToStart" "jumpToEnd" "animateToStart" "animateToEnd"

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Derived Constraints

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Derived Constraint Base layout

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Derived Constraint Base layout + view1 gone

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Derived Constraint Base layout + view1 gone + view2 gone

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Derived Constraint Base layout + view1 gone + view2 gone + view3 gone

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Virtual Layout Alpha 5

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Flow

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Flow : Virtual Layout Helper : reference objets Keep a Flat Hierarchy On the fly changes

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Flow modes 1. Apply an horizontal or vertical chain to the elements 2. Wrap elements as needed, using chains 3. Wrap elements as needed, aligning in rows & columns

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Flow : a view

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Flow : a view Flow is a perfectly normal view You can ask it to wrap_content or be of a given size You can set up a background

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Flow : XML

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Flow : chains

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Flow mode : chains A B C Spread

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Flow mode : chains A B C Spread Inside

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Flow mode : chains A B C Packed

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Flow : XML

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Flow : XML

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Flow : XML

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Flow : Wrap Chains

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Flow mode : wrap chains A B C D E F

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Flow mode : wrap chains A B C D E F

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Flow mode : wrap chains A B C D E F Wrapping Add a new chain

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Flow mode : wrap chains A B C D E F Wrapping Spread Chain

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Flow mode : wrap chains A B C D E F Wrapping Spread Chain Packed Chain

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Flow mode : wrap chains A B C D E F Wrapping : max elements = 3 (wrap_content)

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Flow mode : wrap chains A B C D E F No Table?

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Flow : Wrap Align

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Flow mode : wrap chains A B C D E F Wrap : chains

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Flow mode : wrap align A B C D E F Wrap : Align

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Example

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Calculator

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MotionLayout & Flow

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MotionLayout with Flow

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MotionLayout with Flow

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MotionLayout with Flow

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MotionLayout with Flow

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RecyclerView + MotionLayout

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How it works Handle Gesture Provide a similar view Add view to Placeholder in MotionLayout Recompute bounds Run transition

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Handling new PlaceholderGestureHandler( motionLayout, recyclerView, view, viewType ) gestureHandler.onTouchEvent(event)

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Basic start to end motion

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Basic start to end motion

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Add size delay

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Add size delay

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Add tilt

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Add tilt

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Wrapping up…

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Timeline… Alpha 4 : released April 4th Alpha 5 : in the next few days! Beta 1 around Google IO Motion Editor : resume work after Google IO

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developer.android.com https://developer.android.com/reference/android/support/constraint/classes.html Medium Articles: Introduction to MotionLayout part I http://bit.ly/2O4AmIz Introduction to MotionLayout part II http://bit.ly/2uPuWbw Introduction to MotionLayout part III http://bit.ly/2zRjCSj Introduction to MotionLayout part IV http://bit.ly/2QqfJaF Github: https://github.com/googlesamples/android-ConstraintLayoutExamples Documentation

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Give us feedback! http://issuetracker.google.com ConstraintLayout component

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Thanks! Nicolas Roard @camaelon John Hoford @johnhoford