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CONSTRAINT LAYOUT 2.0 Nicolas Roard & John Hoford @camaelon @johnhoford (Sneak peek)

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BUT FIRST…

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CL 1.1 1.1

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ConstraintLayout 2.0 preview GOOGLE MAVEN REPOSITORY dependencies { compile 'com.android.support.constraint:constraint-layout:1.1.0' }

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ConstraintLayout 2.0 preview CONSTRAINT LAYOUT 1.1 ➤ Constraints ➤ Helper objects ➤ Optimizer ➤ ton of bug fixes!

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ConstraintLayout 2.0 preview CONSTRAINTS ➤ Constrained Dimensions : percent, min/max, wrap ➤ Circular constraints ➤ Complex chains

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ConstraintLayout 2.0 preview CIRCULAR CONSTRAINTS

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ConstraintLayout 2.0 preview EXAMPLE Andrew Kelly https://medium.com/devnibbles/ constraintlayout-circular- positioning-9489b11cb0e5

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ConstraintLayout 2.0 preview EXAMPLE Andrew Kelly https://medium.com/devnibbles/ constraintlayout-circular- positioning-9489b11cb0e5

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ConstraintLayout 2.0 preview HELPER OBJECTS ➤ Barriers ➤ Groups ➤ Placeholders

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ConstraintLayout 2.0 preview BARRIERS ➤ A barrier takes the minimum or maximum of a set of widget ➤ Other widgets can then be constrained to it ➤ Allows to build more flexible layouts Helper object

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Barriers

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Barriers

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Barriers 1 2 3

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Barriers 1 2 3 4

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Barriers

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Barriers

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ConstraintLayout 2.0 preview GROUPS ➤ Define a set of widgets ➤ Apply visibility to them Helper object

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Groups textview2 textview3

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Groups Invisible Gone

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } fun select(v: View) { TransitionManager.beginDelayedTransition(main_layout) placeholder.setContentId(v.id) main_title.text= v.tag as CharSequence?;""; } } Placeholder

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } fun select(v: View) { TransitionManager.beginDelayedTransition(main_layout) placeholder.setContentId(v.id) main_title.text= v.tag as CharSequence?;""; } } Placeholder

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ConstraintLayout 2.0 preview OPTIMIZER ➤ New optimizer in 1.1 ➤ A lot more powerful :) ➤ Multiple optimizations passes available ➤ Direct & Center connections ➤ Barriers ➤ Chains (experimental) ➤ Dimensions (experimental)

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ConstraintLayout 2.0 preview OPTIMIZER ATTRIBUTE app:layout_optimizationLevel=“standard” app:layout_optimizationLevel=“direct|barriers|chains|dimensions”

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ConstraintLayout 2.0 preview OPTIMIZER CONSTRAINTS OPTIMIZER SOLVER MEASURES

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ConstraintLayout 2.0 preview OPTIMIZER Widget A

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ConstraintLayout 2.0 preview OPTIMIZER Widget A

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ConstraintLayout 2.0 preview OPTIMIZER Widget A

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ConstraintLayout 2.0 preview OPTIMIZER Widget A

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ConstraintLayout 2.0 preview OPTIMIZER Widget A Widget B

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ConstraintLayout 2.0 preview OPTIMIZER Widget A Widget B

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ConstraintLayout 2.0 preview OPTIMIZER Widget A Widget B

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ConstraintLayout 2.0 preview OPTIMIZER

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ConstraintLayout 2.0 preview OPTIMIZER

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CONSTRAINT LAYOUT 2.0Preview

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“

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CL 2.0 WHY?

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CL 2.0 UI : RAISING THE BAR

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CL 2.0 HELP!

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CL 2.0 VOCABULARY

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ConstraintLayout 2.0 preview TOOLING ➤ Integrated manipulation in the component tree (like for barriers) ➤ Exposed in the Palette ➤ Support 3rd party libraries ➤ exposing their custom views / helpers

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CL 2.0 HELPERS

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ConstraintLayout 2.0 preview THREE MAIN CATEGORIES OF HELPERS Layout Manipulation Rendering or Decorating Post-Layout Manipulation

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ConstraintLayout 2.0 preview CONSTRAINT HELPERS ➤ Keep a reference to existing views ➤ Flat hierarchy ➤ Views can be referenced by multiple helpers ➤ Essentially, it allows you to tag views, setting specific behaviors

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ConstraintLayout 2.0 preview API ➤ Access a list of views ➤ pre/post layouts callbacks ➤ normal views ➤ already used ➤ barriers ➤ groups

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ConstraintLayout 2.0 preview COLLECTION ➤ Trampoline object ➤ forward function calls to referenced views ➤ setVisibility ➤ setAlpha ➤ setRotation, etc. ➤ no getter!

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CL 2.0 DECORATORS

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ConstraintLayout 2.0 preview DECORATORS ➤ Can reference views ➤ Easily build decorators that depends on views location / visibility / etc

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ConstraintLayout 2.0 preview METABALLS 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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Decorator Canvas ImageViews

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Decorator Canvas ImageViews

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Decorator Canvas ImageViews

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Metaballs Decorator

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Metaballs Decorator

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Metaballs Decorator

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Metaballs Decorator

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ConstraintLayout 2.0 preview LAYER DECORATOR ➤ Group ++ ➤ Manipulate graphically a collection of views ➤ Supports transforms, etc. ➤ Can be set as the bounding box of the referenced views

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ConstraintLayout 2.0 preview LET’S CREATE A DRAWABLE…

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ConstraintLayout 2.0 preview LAYER DECORATOR

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ConstraintLayout 2.0 preview LAYER DECORATOR

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ConstraintLayout 2.0 preview LAYER DECORATOR

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ConstraintLayout 2.0 preview LAYER DECORATOR

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ConstraintLayout 2.0 preview LAYERS : PROGRAMMATIC ACCESS Layer layer = findViewById(R.id.layer); layer.setRotation(angle); layer.setScaleX(1+(180 - Math.abs(angle-180))/20f); layer.setScaleY(1+(180 - Math.abs(angle-180))/20f); float shift_x = 500 * (float) Math.sin(Math.toRadians(angle*5)); float shift_y = 500 * (float) Math.sin(Math.toRadians(angle*7)); layer.setTranslationX(shift_x); layer.setTranslationY(shift_y);

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY-IN DECORATOR

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ConstraintLayout 2.0 preview FLY IN DECORATOR @Override public void updatePostLayout(ConstraintLayout container) { update(); } void update(){ if (mContainer == null) { return; } mComputedCenterX = Float.NaN; mComputedCenterY = Float.NaN; View[] views = getViews(mContainer); calcCenters(); float shift = myFlyValue-1; for (int i = 0; i < mCount; i++) { View view = views[i]; int x = (view.getLeft() + view.getRight()) / 2; int y = (view.getTop() + view.getBottom()) / 2; view.setTranslationX((x - mComputedCenterX)*shift); view.setTranslationY((y - mComputedCenterY)*shift); } }

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ConstraintLayout 2.0 preview FLY IN DECORATOR @Override public void updatePreLayout(ConstraintLayout container) { if (mContainer!=container) { setFlyIn(10); ObjectAnimator.ofFloat(this, "FlyIn", 1f) .setDuration(1000).start(); } mContainer = container; } public void setFlyIn(float flyIn) { myFlyValue = flyIn; update(); }

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ConstraintLayout 2.0 preview FLY IN DECORATOR: XML

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ConstraintLayout 2.0 preview (BONUS CODE) public void calcCenters() { if (!(Float.isNaN(mComputedCenterX) || Float.isNaN(mComputedCenterY))) { return; } if (Float.isNaN(mCenterX) || Float.isNaN(mCenterY)) { int minx = Integer.MAX_VALUE, miny= Integer.MAX_VALUE; int maxx= Integer.MIN_VALUE,maxy= Integer.MIN_VALUE; View []views = getViews(mContainer); for (int i = 0; i < mCount; i++) { View view = views[i]; minx = Math.min(minx, view.getLeft()); miny = Math.min(miny, view.getTop()); maxx = Math.max(maxx, view.getRight()); maxy = Math.max(maxy, view.getBottom()); } mComputedCenterX = (Float.isNaN(mCenterX))?(minx + maxx) / 2:mCenterX; mComputedCenterY = (Float.isNaN(mCenterY))?(miny + maxy) / 2:mCenterY; } else { mComputedCenterY = mCenterY; mComputedCenterX = mCenterX; } }

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ConstraintLayout 2.0 preview CIRCULAR REVEAL

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ConstraintLayout 2.0 preview CIRCULAR REVEAL

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ConstraintLayout 2.0 preview CIRCULAR REVEAL @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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ConstraintLayout 2.0 preview DECORATOR HELPERS ➤ Tag your views with behavior ➤ Encapsulate behavior ➤ Declaratively use them

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CL 2.0 VIRTUAL LAYOUTS

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ConstraintLayout 2.0 preview VIRTUAL LAYOUTS ➤ Layout the referenced views ➤ Still keep flat hierarchy ➤ Linear ➤ Flow

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ConstraintLayout 2.0 preview LINEAR ➤ Create horizontal or vertical chains ➤ Somewhat similar to linear layout, but as a helper

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ConstraintLayout 2.0 preview LINEAR

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ConstraintLayout 2.0 preview LINEAR

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ConstraintLayout 2.0 preview

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ConstraintLayout 2.0 preview LINEAR

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ConstraintLayout 2.0 preview FLOW ➤ Implements FlexboxLayout-like semantics ➤ Overflow elements will be pushed to the next row ➤ Still flat layout! ➤ Able to position outside elements relative to the ones in Flow

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ConstraintLayout 2.0 preview FLOW

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ConstraintLayout 2.0 preview REFERENCE BUTTONS

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ConstraintLayout 2.0 preview FLOW

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ConstraintLayout 2.0 preview FLOW

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ConstraintLayout 2.0 preview FLOW

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CL 2.0 LAYOUT MANAGEMENT

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ConstraintLayout 2.0 preview MANAGING STATES

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ConstraintLayout 2.0 preview MANAGING STATES

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ConstraintLayout 2.0 preview STATE XML

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ConstraintLayout 2.0 preview JAVA-SIDE @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout); cl = findViewById(R.id.root); cl.setLayoutDescription(R.xml.layout_states); }

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ConstraintLayout 2.0 preview JAVA-SIDE @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout); cl = findViewById(R.id.root); cl.setLayoutDescription(R.xml.layout_states); } public void change(View v) { cl.setState(closed ? R.id.large : R.id.small); closed = !closed; }

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ConstraintLayout 2.0 preview STATE XML : SIZE QUALIFIERS

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ConstraintLayout 2.0 preview ON CONFIGURATION CHANGE @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); cl.setState(newConfig.screenWidthDp, newConfig.screenHeightDp); }

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview LIVE RESIZE

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ConstraintLayout 2.0 preview CALLBACK cl.setOnConstraintsChanged(new ConstraintsChangedListener() { @Override public void preLayoutChange(int state,int layoutId) { TransitionManager.beginDelayedTransition(cl); } });

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ConstraintLayout 2.0 preview ANIMATED LIVE RESIZE (TRANSITION MANAGER)

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ConstraintLayout 2.0 preview ANIMATED LIVE RESIZE (TRANSITION MANAGER)

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ConstraintLayout 2.0 preview LAYOUT MANAGEMENT ➤ Centralize multiple layouts in a single XML ➤ Allows to easily initialize and deal with different representations for your layout ➤ Size qualifiers & live resize

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CL 2.0 FLUENT API

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ConstraintLayout 2.0 preview FLUENT API ➤ ConstraintSet: great to capture full state and manage it ➤ …But not that ideal for direct manipulation ➤ Fluent API to change layout params directly

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ConstraintLayout 2.0 preview FLUENT API new Constraints(view).margin(ConstraintProperties.TOP,23).apply(); Constraints.on(view) .margin(TOP, 16) .margin(BOTTOM, 16) .margin(LEFT, 16) .margin(RIGHT, 16) .apply(); Constraints.on(view) .center(R.id.button1, LEFT, 23, R.id.button2, RIGHT, 23,.05f) .connect(TOP,PARENT_ID, TOP, 32) .apply();

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ConstraintLayout 2.0 preview EXAMPLE : CENTER Constraints.on(myView) .center(R.id.button1, LEFT, R.id.button2, RIGHT) .horizontalBias(.5f) .top(PARENT_ID,TOP,32) .apply();

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ConstraintLayout 2.0 preview center(int firstID, int firstSide, int firstMargin, int secondId, int secondSide, int secondMargin, f centerHorizontally(int leftId, int leftSide, int leftMargin, int rightId, int rightSide, int rightMar centerHorizontallyRtl(int startId, int startSide, int startMargin, int endId, int endSide, int endMar centerVertically(int topId, int topSide, int topMargin, int bottomId, int bottomSide, int bottomMargi centerHorizontally(int toView) centerHorizontallyRtl(int toView) centerVertically(int toView) removeConstraints(int anchor) margin(int anchor, int value) goneMargin(int anchor, int value) horizontalBias(float bias) verticalBias(float bias) dimensionRatio(String ratio) visibility(int visibility) alpha(float alpha) elevation(float elevation) rotation(float rotation) rotationX(float rotationX) rotationY(float rotationY) scaleX(float scaleX) scaleY(float scaleY) CONSTRAINTS API… translationX(float translationX) translationY(float translationY) translation(float translationX, float translationY) translationZ(float translationZ) constrainHeight(int height) constrainWidth(int width) constrainMaxHeight(int height) constrainMaxWidth(int width) constrainMinHeight(int height) constrainMinWidth(int width) constrainDefaultHeight(int height) constrainDefaultWidth(int width) horizontalWeight(float weight) verticalWeight(float weight) horizontalChainStyle(int chainStyle) verticalChainStyle(int chainStyle) addToHorizontalChain(int leftId, int rightId) addToHorizontalChainRTL(int leftId, int rightId) addToVerticalChain(int topId, int bottomId) removeFromVerticalChain() removeFromHorizontalChain() connect(int startSide, int endID, int endSide, int margin

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ConstraintLayout 2.0 preview CONSTRAINT LAYOUT 2.0 - SUMMARY ➤ Virtual Layouts ➤ Layers & Transitions ➤ Decorators ➤ State management & Live Resize ➤ Fluent API for LayoutParams ➤ …more to come!

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THANKS! Nicolas Roard & John Hoford @camaelon @johnhoford

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CL 2.0 TO BE CONTINUED… … at Google IO 2018!

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ConstraintLayout 2.0 preview DOCUMENTATION ➤ http://www.constraintlayout.com ➤ https://developer.android.com/reference/android/support/constraint/package- summary.html ➤ https://developer.android.com/training/constraint-layout/index.html ➤ https://codelabs.developers.google.com/codelabs/constraint-layout ➤ https://medium.com/google-developers/building-interfaces-with- constraintlayout-3958fa38a9f7