Android Design Tools : New features and tools for rapid UI development

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Android Design Tools Nicolas Roard +NicolasRoard @camaelon

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Goals

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Goals Visualize

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Goals Visualize Create

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Goals Visualize Create Easy

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Goals Visualize Create Easy Efﬁciently

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Android Studio Designer

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Android Studio Designer Layout Lib

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Android Studio Designer Layout Lib Libraries

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Android Studio Designer Layout Lib Libraries Project code & resources

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Android Studio Designer Layout Lib Libraries Layout Handlers Project code & resources

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time ignore speciﬁc lint issues https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time ignore speciﬁc lint issues shows this layout embedded in another one https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time ignore speciﬁc lint issues shows this layout embedded in another one which layout to use for a fragment https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time ignore speciﬁc lint issues shows this layout embedded in another one which layout to use for a fragment which layout for a list item https://developer.android.com/studio/write/tool-attributes.html

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Tools attributes • tools: • tools:ignore • tools:showIn • tools:layout • tools:listitem • tools:parentTag override attributes at design time ignore speciﬁc lint issues shows this layout embedded in another one which layout to use for a fragment which layout for a list item deﬁne which layout to use as parent for merge tag https://developer.android.com/studio/write/tool-attributes.html

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Useful shortcuts • to select a parent group • to switch between XML and Design mode • double-click on included elements

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ConstraintLayout

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Why

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ConstraintLayout • Flat Layouts • Expressive Layouts • Visual Editor

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Vertical LinearLayout

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Vertical LinearLayout RelativeLayout Image Image

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout TextView

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout TextView Horizontal LinearLayout EditText TextView

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout TextView Horizontal LinearLayout EditText TextView Horizontal LinearLayout EditText TextView

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout TextView Horizontal LinearLayout EditText TextView Horizontal LinearLayout EditText TextView TextView

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Vertical LinearLayout RelativeLayout Image Image Vertical LinearLayout TextView Horizontal LinearLayout EditText TextView Horizontal LinearLayout EditText TextView TextView Horizontal LinearLayout Button Button

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ConstraintLayout

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ConstraintLayout Image Image TextView EditText TextView EditText TextView TextView Button Button

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ConstraintLayout Image Image TextView EditText TextView EditText TextView TextView Button Button

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What

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Constraints

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Constraints No Constraints…

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Constraints

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Constraints Vertical + Horizontal Constraints

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Constraints

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Constraints at least one horizontal one vertical

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver Linear System Solver

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver Linear System Solver Constraints System

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver Linear System Solver Direct Resolution Constraints System

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver Linear System Solver Direct Resolution Constraints System UI Builder

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What • Small (130 Kb) • Unbundled Library • Flexible foundation • Direct Resolution • Linear System Solver Linear System Solver Direct Resolution Constraints System UI Builder Inference

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1.0.2 • 16 updates since Google IO’16 • Faster! • New Features • Improved Visual Editor support • Default Layout in Android Studio

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Constraints

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Relative Positioning Chains Guidelines Gone Dimension Relative Positions

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Relative Positioning Chains Guidelines Gone Dimension Relative Positions

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Text Baseline Chains Guidelines Gone Dimension Relative Positions

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Text Baseline Chains Guidelines Gone Dimension Relative Positions

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Bias Chains Guidelines Gone Dimension Relative Positions

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Bias Chains Guidelines Gone Dimension Relative Positions

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Dimensions • wrap_content • match_constraint (0dp) • ﬁxed size Chains Guidelines Gone Dimension Relative Positions

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Dimensions • wrap_content • match_constraint (0dp) • ﬁxed size android:layout_height=“wrap_content" android:layout_height="0dp" android:layout_height="42dp" Chains Guidelines Gone Dimension Relative Positions

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Dimensions wrap match ﬁxed Chains Guidelines Gone Dimension Relative Positions

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Match Constraint • default behavior (spread vs wrap) • ratio • weights (in chains) • min & max Chains Guidelines Gone Dimension Relative Positions

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Match Constraint : max Chains Guidelines Gone Dimension Relative Positions

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Match Constraint : max Chains Guidelines Gone Dimension Relative Positions

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Aspect Ratio Chains Guidelines Gone Dimension Relative Positions

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Aspect Ratio Chains Guidelines Gone Dimension Relative Positions

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Gone behavior Chains Guidelines Gone Dimension Relative Positions

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Gone behavior Chains Guidelines Gone Dimension Relative Positions

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Chains Guidelines Gone Dimension Relative Positions

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Inadapted Margins? Chains Guidelines Gone Dimension Relative Positions

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Chains Guidelines Gone Dimension Relative Positions

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Gone Margins! Chains Guidelines Gone Dimension Relative Positions

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Guidelines Chains Guidelines Gone Dimension Relative Positions

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Guidelines Chains Guidelines Gone Dimension Relative Positions

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Chains A B Chain bi-directional constraints Chains Guidelines Gone Dimension Relative Positions

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Different Chain Styles A B C Spread A B C Spread Inside A B C Weighted A B C Packed Chains Guidelines Gone Dimension Relative Positions

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Different Chain Styles A B C Spread A B C Spread Inside A B C Weighted A B C Packed + bias Chains Guidelines Gone Dimension Relative Positions

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Chains Guidelines Gone Dimension Relative Positions

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Chains Guidelines Gone Dimension Relative Positions

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Constraint Layout Tools

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Tools

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Tools

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Tools

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Tools

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Tools

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Tools

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Tools

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Tools • Automatically makes constraints • Control for simple moving of views

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Tools • Automatically makes constraints • Control for simple moving of views

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Inference Automatically create constraints • Based on probability a model for connections • Constrains unconstrained views • Does not move views (not an alignment tool)

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Inference Automatically create constraints • Based on probability a model for connections • Constrains unconstrained views • Does not move views (not an alignment tool)

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Animation

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Animation

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Animation

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ConstraintSet

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ConstraintSet ConstraintSet mConstraintSet1 = new ConstraintSet(); // create a Constraint Set ConstraintSet mConstraintSet2 = new ConstraintSet(); // create a Constraint Set

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ConstraintSet ConstraintSet mConstraintSet1 = new ConstraintSet(); // create a Constraint Set ConstraintSet mConstraintSet2 = new ConstraintSet(); // create a Constraint Set mConstraintSet2.clone(context, R.layout.state2); // get constraints from layout setContentView(R.layout.state1); mConstraintLayout = (ConstraintLayout) findViewById(R.id.activity_main); mConstraintSet1.clone(mConstraintLayout); // get constraints from ConstraintSet

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• Programmatically change individual parameters • Use TransitionManager to smooth animation Individual View Animation

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• Programmatically change individual parameters • Use TransitionManager to smooth animation Individual View Animation

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• Programmatically change individual parameters • Use TransitionManager to smooth animation Individual View Animation //Find the view you are over and set minimum height TransitionManager.beginDelayedTransition(myConstraintLayout); View child = myConstraintLayout.getChildAt(current); child.setMinimumHeight(400);

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A few examples…

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Row

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Row

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Tip: tools attributes tools:listitem=“@layout/row” https://developer.android.com/ studio/write/tool-attributes.html

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How it works • Vertical Chain, packed • ImageView with height=0dp • ImageView with default height behavior to “wrap”

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How it works • Vertical Chain, packed • ImageView with height=0dp • ImageView with default height behavior to “wrap”

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How it works • Horizontal Chain, packed • Bias to 0 • Resizable element set to default=wrap

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Dialog

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Dialog

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Landscape

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Rotation

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Rotation

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Animation…

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Animation…

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• | 2 layouts

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Custom Animations • ConstraintSet • Custom TransitionSet • Support library physics

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Custom Animations • ConstraintSet • Custom TransitionSet • Support library physics

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What’s next • Android Studio 2.4 • default RTL support in ConstraintLayout editor • Component Tree • ConstraintLayout 1.1 • Barriers • Groups

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Barriers • “min” and “max” for constraints • implemented as a virtual helper

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Barriers • “min” and “max” for constraints • implemented as a virtual helper

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Groups • Apply operations on a group of widget • opacity • translate • elevation • visibility

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Component Tree

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Slice Editor

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Slice Editor

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Slice Editor

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Slice Editor

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Fin

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Contact Nicolas Roard @camaelon +NicolasRoard John Hoford @johnhoford +johnhoford Documentation https://developer.android.com/ reference/android/support/constraint/ package-summary.html File Bugs! http://b.android.com