Production MotionLayout

by Jason Pearson

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Production MotionLayout Jason Pearson NYC Android Developers Meetup - Jan 2020

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@layout/activity_main Creating our ﬁrst MotionScene @kaeawc

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@layout/activity_main Creating our ﬁrst MotionScene @layout/activity_main @kaeawc

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@layout/activity_main Creating our ﬁrst MotionScene Need to create a MotionScene @layout/activity_main @kaeawc

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src/ ├── java/ └── res/ ├── drawable ├── layout │ └── ├── mipmap └── values Creating our ﬁrst MotionScene activity_main.xml @kaeawc

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Creating our ﬁrst MotionScene src/ ├── java/ └── res/ ├── drawable ├── layout │ └── ├── mipmap ├── values └── xml activity_main.xml @kaeawc

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src/ ├── java/ └── res/ ├── drawable ├── layout │ └── ├── mipmap ├── values └── xml └── motion_scene.xml activity_main.xml Creating our ﬁrst MotionScene xml motion_scene @kaeawc

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@xml/motion_scene Creating our ﬁrst MotionScene motion_scene xml @kaeawc

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@xml/motion_scene @layout/activity_main Creating our ﬁrst MotionScene @layout/activity_main

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@xml/motion_scene @layout/activity_main Creating our ﬁrst MotionScene @layout/activity_main

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@xml/motion_scene @layout/activity_main Creating our ﬁrst MotionScene @layout/activity_main

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@layout/activity_main @layout/activity_main Creating our ﬁrst MotionScene @xml/motion_scene

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@layout/activity_main Adding ﬁrst child to MotionScene @kaeawc

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@layout/activity_main Adding ﬁrst child to MotionScene @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet Omitting schemas from now on @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet @xml/motion_scene @kaeawc

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@xml/motion_scene Adding ﬁrst ConstraintSet @xml/motion_scene motion_scene.xml ConstraintSet start @kaeawc

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Adding second ConstraintSet @xml/motion_scene motion_scene.xml ConstraintSet start @kaeawc

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Adding second ConstraintSet @xml/motion_scene motion_scene.xml ConstraintSet start ConstraintSet end @kaeawc

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Adding second ConstraintSet @xml/motion_scene motion_scene.xml ConstraintSet start ConstraintSet end @kaeawc

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Adding second ConstraintSet @xml/motion_scene motion_scene.xml ConstraintSet start ConstraintSet end @kaeawc

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@xml/motion_scene

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@xml/motion_scene

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@xml/motion_scene Adding ﬁrst Transition @xml/motion_scene motion_scene.xml ConstraintSet start ConstraintSet end Transition start @kaeawc

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@xml/motion_scene Adding ﬁrst Transition @xml/motion_scene motion_scene.xml ConstraintSet start ConstraintSet end Transition start end @kaeawc

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@xml/motion_scene

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@xml/motion_scene

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@xml/motion_scene

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@xml/motion_scene

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motion_scene.xml It works! " ConstraintSet start ConstraintSet end Transition OnClick square start end @kaeawc

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@xml/motion_scene motion_scene.xml @xml/motion_scene ConstraintSet start ConstraintSet end OnClick Transition OnClick square start end @kaeawc

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@xml/motion_scene motion_scene.xml @xml/motion_scene ConstraintSet start ConstraintSet end OnClick Transition OnClick square start end @kaeawc

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@xml/motion_scene OnClick motion_scene.xml ConstraintSet start ConstraintSet end Transition OnClick square start end @kaeawc

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OnClick motion_scene_with_click.xml Transition OnClick square start end ConstraintSet start ConstraintSet end @kaeawc

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motion_scene_with_click.xml motion_scene_with_swipe.xml OnSwipe OnClick ConstraintSet start ConstraintSet end Transition OnClick square start end Transition OnSwipe square start end start end ConstraintSet start ConstraintSet end @kaeawc

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Transition OnClick square start Transition end OnSwipe square start end OnSwipe OnClick @kaeawc

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@xml/motion_scene_with_swipe @xml/motion_scene_with_click @xml/motion_scene_with_click @xml/motion_scene_with_swipe OnSwipe OnClick @kaeawc

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@xml/motion_scene_with_swipe @xml/motion_scene_with_click OnSwipe OnClick @xml/motion_scene_with_click @xml/motion_scene_with_swipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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OnSwipe @xml/motion_scene_with_swipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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@xml/motion_scene_with_swipe OnSwipe @kaeawc

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autoComplete stop decelerate @kaeawc

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@xml/swiping_scene Adding another state swiping_scene.xml ConstraintSet start ConstraintSet end @kaeawc

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@xml/swiping_scene Adding another state swiping_scene.xml ConstraintSet start ConstraintSet end ConstraintSet middle @kaeawc

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@xml/swiping_scene Adding another state swiping_scene.xml ConstraintSet start Transition swipe_a OnSwipe square start middle Transition swipe_b OnSwipe square middle end @kaeawc

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Adding another state swiping_scene.xml ConstraintSet start ConstraintSet end ConstraintSet middle Transition swipe_a OnSwipe square start middle Transition swipe_b OnSwipe square middle end

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@xml/motion_scene @xml/motion_scene Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic @xml/motion_scene Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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easeInOut easeIn easeOut linear standard bounce cubic(0.42,0,1,1) app:motionInterpolator=" "a Interpolation @kaeawc

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app:motionInterpolator="cubic(0.42,0,1,1)" https://cubic-bezier.com/#.42,0,1,1 Interpolation @kaeawc

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Interpolation app:motionInterpolator="cubic(0.42,0,1,1)" https://cubic-bezier.com/#.42,0,1,1 @kaeawc

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https://cubic-bezier.com/#.42,0,1,1

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Sub Elements @kaeawc

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Sub Elements @kaeawc

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Sub Elements @kaeawc

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Sub Elements :-PropertySet @kaeawc

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Sub Elements :-PropertySet @kaeawc

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Sub Elements :-Motion @kaeawc

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Linear Horizontal Vertical @kaeawc

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Horizontal Linear Vertical @kaeawc

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@xml/motion_scene @xml/motion_scene Sub Elements :-Motion @kaeawc

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Sub Elements :-Motion @xml/motion_scene @kaeawc

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Sub Elements: Transform @kaeawc

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swiping_scene.xml Sub Elements: Transform ConstraintSet start ConstraintSet end Transition toggle OnClick square start end @kaeawc

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swiping_scene.xml Sub Elements: Transform ConstraintSet start ConstraintSet end Transition toggle OnClick square start end Transform @kaeawc

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swiping_scene.xml Sub Elements: Transform ConstraintSet start ConstraintSet end Transition toggle OnClick square start end Transform rotate 360 @kaeawc

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swiping_scene.xml Sub Elements: Transform ConstraintSet start ConstraintSet end Transition toggle OnClick square start end Transform rotate 360 rotateX 360 @kaeawc

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swiping_scene.xml Sub Elements: Transform ConstraintSet start ConstraintSet end Transition toggle OnClick square start end Transform rotate 360 rotateX 360 @kaeawc

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Sub Elements: Transform swiping_scene.xml ConstraintSet start ConstraintSet end Transition toggle OnClick square start end Transform rotate 360 rotateX 360 @kaeawc

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Sub Elements: Transform swiping_scene.xml ConstraintSet start ConstraintSet end Transition toggle OnClick square start end KeyFrameSet Transform rotate 360 rotateX 360 @kaeawc

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Sub Elements: Transform swiping_scene.xml ConstraintSet start ConstraintSet end Transition toggle OnClick square start end KeyFrameSet KeyFrame 33 KeyFrame 66 translateX -64dp translateX 64dp Transform rotate 360 rotateX 360 @kaeawc

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KeyFrameSet Sub Elements: Transform swiping_scene.xml ConstraintSet start ConstraintSet end Transition toggle OnClick square start end KeyFrameSet KeyFrame 33 KeyFrame 66 translateX -64dp translateX 64dp Transform rotate 360 rotateX 360 @kaeawc

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KeyFrameSet KeyFrameSets @kaeawc

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KeyFrameSet KeyFrameSets @kaeawc

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KeyFrameSets KeyFrameSet KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet 100 0 25 50 75 KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet 100 0 25 50 75 KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet 100 0 25 50 75 KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet 100 0 25 50 75 KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets KeyFrameSet 100 0 25 50 75 KeyFrames let you specify a change at a point in time during transition @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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KeyFrameSets: Key Attribute @kaeawc

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Practical Examples

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Swipe To Reveal Action in a List @layout/activity_swipe_items @kaeawc

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@layout/activity_swipe_items Swipe To Reveal Action in a List @kaeawc

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@layout/activity_swipe_items @xml/swipe_item_scene Swipe To Reveal Action in a List @kaeawc

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@xml/swipe_item_scene Swipe To Reveal Action in a List @kaeawc

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@xml/swipe_item_scene Swipe To Reveal Action in a List @kaeawc

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@xml/swipe_item_scene Swipe To Reveal Action in a List @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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There is no change in horizontal position of any side in the foreground view, therefore MotionLayout cannot determine how to interpolate between the two states Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal @kaeawc

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Swipe To Reveal Action in a List @kaeawc

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Or do not specify a touchAnchor and then there is no need to create clever hidden views. Swipe To Reveal Action in a List @kaeawc

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Collapsing Toolbar @layout/activity_collapsing_toolbar @kaeawc

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Collapsing Toolbar @xml/collapse_on_scroll_scene @kaeawc

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Collapsing Toolbar @xml/collapse_on_scroll_scene @kaeawc

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android:layout_height="128dp" app:layout_constraintTop_toTopOf="parent"/> Collapsing Toolbar @xml/collapse_on_scroll_scene @kaeawc

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android:layout_height="128dp" app:layout_constraintTop_toTopOf="parent"/> Collapsing Toolbar - Derived Constraints @xml/collapse_on_scroll_scene @kaeawc

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Nested MotionLayout @kaeawc

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@layout/activity_collapsing_toolbar Nested MotionLayout @layout/activity_collapsing_toolbar @kaeawc

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@layout/activity_collapsing_toolbar Nested MotionLayout @layout/activity_collapsing_toolbar @kaeawc

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Nested MotionLayout Header - Scaling Text @xml/collapsing_header_scene @kaeawc

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@xml/collapsing_header_scene Nested MotionLayout Header - Scaling Text @kaeawc

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Scaling Text @kaeawc

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Scaling Text @kaeawc

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Scaling Text @kaeawc

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textSize via CustomAttribute scaleX&Y via Transform @kaeawc

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Nested MotionLayout Header @xml/collapsing_header_scene @kaeawc

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Nested MotionLayout @xml/collapse_on_scroll_scene @kaeawc

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Nested MotionLayout @xml/collapse_on_scroll_scene @kaeawc

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Nested MotionLayout @xml/collapse_on_scroll_scene @kaeawc

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tionScene> Changing Text in MotionLayout @xml/collapsing_header_scene @kaeawc

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Changing Constraints Programmatically • MotionLayout is just an extension of ConstraintLayout • After making changes to a ConstraintSet we must call motionLayout.updateState(constraintSetId, constraintSet) motionLayout.setTransition(start, end) motionLayout.transitionToEnd() @kaeawc

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constraintSet.connect(viewId, TOP, R.id.boundaries, TOP, 0) constraintSet.connect(viewId, START, R.id.boundaries, START, 0) constraintSet.connect(viewId, END, R.id.boundaries, END, 0) constraintSet.connect(viewId, BOTTOM, R.id.boundaries, BOTTOM, 0) constraintSet.setElevation(view.id, 1f) motion_layout.updateState(R.id.zoomed_in, constraintSet) Changing Constraints Programmatically PhotoGridActivity.kt @xml/grid_zoom_scene @kaeawc

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RecyclerView & MotionLayout Placeholder • Calculate ViewHolder View position • Update a placeholder view within the starting ConstraintSet • Show hidden MotionLayout with placeholder @kaeawc

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RecyclerView & MotionLayout Placeholder @kaeawc

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AutoTransitions @kaeawc

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Changing Transitions on the ﬂy

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Constraints - Limitations • Some problems cannot be solved with derived Constraints. • Creating a very large number of ConstraintSets and Transitions is infeasible. @kaeawc

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Constraints - Limitations N!/2 States Each requires a handwritten ConstraintSet This 2x2 board has 12 states A 3x3 board would have 181440 states @kaeawc

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Constraints - Limitations @kaeawc

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Other Practical Examples

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Swiping Items with Collapsing Toolbar @kaeawc

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Progress Indicator @kaeawc

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ProgressBar @kaeawc

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TabLayout & Many NestedScrollViews MainActivity.kt override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) view_pager?.apply { adapter = MainAdapter(supportFragmentManager) tab_layout?.setupWithViewPager(this) addOnPageChangeListener(object: ViewPager.OnPageChangeListener { override fun onPageScrollStateChanged(state: Int) {} override fun onPageScrolled(...) {} override fun onPageSelected(position: Int) { if (root_layout?.progress != 0f) { root_layout?.transitionToStart() } } }) } } internal fun onVerticalScroll(scroll: Int) { root_layout?.progress = Math.min(scroll / 1000f, 1f) } @kaeawc

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Summary

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Why You Should Try MotionLayout • Reduces context switching • Makes some hard animations much easier • Allows us to make animations reentrant, continuous, & smooth @kaeawc

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Challenges in using MotionLayout • It’s still in beta • Lack of official learning materials • Debugging is a bit of trial and error https://codelabs.developers.google.com/codelabs/motion-layout/ But its so much easier now with MotionEditor @kaeawc

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11 MotionLayout in Hinge's production app Onboarding Flow @kaeawc

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Questions? 11 MotionLayout in Hinge's production app Proﬁle Flows @kaeawc

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Questions? bit.ly/prod-motionlayout-nyc-meetup-jan-2020 ﬁnd me on Twitter / Github @kaeawc