Introduction to Motion Layout

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Introduction to Motion Layout Saurabh Arora Rakuten Viki @saurabh_arora90

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Dev asked to work on animations

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Devs after motion layout

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Constraint Layout ● Complex layouts with a flat hierarchy ● Specifying constraints on views w.r.t other views ● Helpers such as Barriers, Groups & Guidelines

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Constraint Set ● Create another layout file with end state ● Pick constraints from end state layout file ● Apply constraints to constraint layout ● Use transition manager for smooth transition

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private val start: ConstraintSet by lazy { val set = ConstraintSet() set.clone(this, R.layout.start) set }

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private val start: ConstraintSet by lazy { val set = ConstraintSet() set.clone(this, R.layout.start) set } private val end: ConstraintSet by lazy { val set = ConstraintSet() set.clone(this, R.layout.end) set }

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onClick() { TransitionManager.beginDelayedTransition(layoutRoot) end.applyTo(constraintLayoutRoot) }

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Constraint Set

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Constraint Set (Cons) ● Uninterruptible ● Multiple Layout files ● Ignores style attributes

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Motion Layout

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Motion Layout ● Introduced in ConstraintLayout 2.0 ● Subclass of ConstraintLayout ● Works with touch system ● Support for intermediate states (keyframes) ● Fully declarative

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Motion Scene Constraint Set Transition Constraints Attributes OnClick OnSwipe KeyFrame Set KeyPosition KeyAttribute

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Attribute Constraint Layout Params Standard Attributes Visibility Alpha Custom Attributes Elevation Scale Rotation Translation ● Reflection ● String, color, float,int or boolean

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Examples

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01: Migrate from Constraint Set

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02: Self Contained Scene

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03: Attributes

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Attribute Constraint Layout Params Standard Attributes Visibility Alpha Custom Attributes Elevation Scale Rotation Translation ● Reflection ● String, color, float,int or boolean

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Custom Attributes ● Call "set"Name method via reflection ● Case sensitive. ● Supports color, string, int, float, boolean & dimension

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04. Keyframes

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Motion Scene Constraint Set Transition Constraints Attributes OnClick OnSwipe KeyFrame Set KeyPosition KeyAttribute

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Motion Scene Constraint Set Transition Constraints Attributes OnClick OnSwipe KeyFrame Set KeyPosition KeyAttribute

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05: Motion Progress

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}ViewPager

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viewPager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() { })

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viewPager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() { override fun onPageScrolled(pos: Int, offset: Float, pixels: Int) { } })

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viewPager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() { override fun onPageScrolled(pos: Int, offset: Float, pixels: Int) { motionRoot.progress = (position + positionOffset) / (COUNT - 1) } })

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}RecyclerView }AppBarLayout

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AppBarLayout.addOnOffsetChangedListener(this) override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) { }

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AppBarLayout.addOnOffsetChangedListener(this) override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) { progress = -verticalOffset / appBarLayout.totalScrollRange.toFloat() }

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Recap ● Part of constraint layout 2.0 - alpha release ● Works with both position/layout and styling attributes ● Interruptible and can set progress

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A mix between the property animation framework, layout transitions with TransitionManager, and CoordinatorLayout - Nicolas Roard

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Devs after motion layout

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Didn't cover ● States and Variants ● Transition easing ● KeyCycles

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What’s next ● Better Tooling ● Motion editor

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Resources ● Google IO'18 Talk ● Introduction to Motion Layout by Nicolas Roard ● Github : MotionLayout-Playground : https://github.com/saurabharora90/MotionLayout-Playground