This class contains the different attributes specifying how a view want to be laid out inside a ConstraintLayout. For building up constraints at run time, using ConstraintSet is recommended.

Summary

Fields
public static final int	BASELINE The baseline of the text in a view.
public int	baselineMargin The baseline margin.
public int	baselineToBaseline Constrains the baseline of a child to the baseline of a target child (contains the target child id).
public int	baselineToBottom Constrains the baseline of a child to the bottom of a target child (contains the target child id).
public int	baselineToTop Constrains the baseline of a child to the top of a target child (contains the target child id).
public static final int	BOTTOM The bottom side of a view.
public int	bottomToBottom Constrains the bottom side of a child to the bottom side of a target child (contains the target child id).
public int	bottomToTop Constrains the bottom side of a child to the top side of a target child (contains the target child id).
public static final int	CHAIN_PACKED Chain packed style
public static final int	CHAIN_SPREAD Chain spread style
public static final int	CHAIN_SPREAD_INSIDE Chain spread inside style
public static final int	CIRCLE Circle reference from a view.
public float	circleAngle The angle used for a circular constraint]
public int	circleConstraint Constrains the center of a child to the center of a target child (contains the target child id).
public int	circleRadius The radius used for a circular constraint
public boolean	constrainedHeight Specify if the vertical dimension is constrained in case both top & bottom constraints are set and the widget dimension is not a fixed dimension.
public boolean	constrainedWidth Specify if the horizontal dimension is constrained in case both left & right constraints are set and the widget dimension is not a fixed dimension.
public java.lang.String	constraintTag Define a category of view to be used by helpers and motionLayout
public java.lang.String	dimensionRatio The ratio information.
public int	editorAbsoluteX The design time location of the left side of the child.
public int	editorAbsoluteY The design time location of the right side of the child.
public static final int	END The right side of a view in left to right languages.
public int	endToEnd Constrains the end side of a child to the end side of a target child (contains the target child id).
public int	endToStart Constrains the end side of a child to the start side of a target child (contains the target child id).
public static final int	GONE_UNSET Defines an id that is not set.
public int	goneBaselineMargin The baseline margin to use when the target is gone.
public int	goneBottomMargin The bottom margin to use when the target is gone.
public int	goneEndMargin The end margin to use when the target is gone.
public int	goneLeftMargin The left margin to use when the target is gone.
public int	goneRightMargin The right margin to use when the target is gone
public int	goneStartMargin The start margin to use when the target is gone.
public int	goneTopMargin The top margin to use when the target is gone.
public int	guideBegin The distance of child (guideline) to the top or left edge of its parent.
public int	guideEnd The distance of child (guideline) to the bottom or right edge of its parent.
public boolean	guidelineUseRtl The ratio of the distance to the parent's sides
public float	guidePercent The ratio of the distance to the parent's sides
public boolean	helped
public static final int	HORIZONTAL The horizontal orientation.
public float	horizontalBias The ratio between two connections when the left and right (or start and end) sides are constrained.
public int	horizontalChainStyle If the child is the start of a horizontal chain, this attribute will drive how the elements of the chain will be positioned.
public float	horizontalWeight The child's weight that we can use to distribute the available horizontal space in a chain, if the dimension behaviour is set to MATCH_CONSTRAINT
public static final int	LEFT The left side of a view.
public int	leftToLeft Constrains the left side of a child to the left side of a target child (contains the target child id).
public int	leftToRight Constrains the left side of a child to the right side of a target child (contains the target child id).
public static final int	MATCH_CONSTRAINT Dimension will be controlled by constraints.
public static final int	MATCH_CONSTRAINT_PERCENT Set matchConstraintDefault* percent to be based on a percent of another dimension (by default, the parent) Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight
public static final int	MATCH_CONSTRAINT_SPREAD Set matchConstraintDefault* spread as much as possible within its constraints.
public static final int	MATCH_CONSTRAINT_WRAP Set matchConstraintDefault* default to the wrap content size.
public int	matchConstraintDefaultHeight Define how the widget vertical dimension is handled when set to MATCH_CONSTRAINT ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_SPREAD -- the default.
public int	matchConstraintDefaultWidth Define how the widget horizontal dimension is handled when set to MATCH_CONSTRAINT ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_SPREAD -- the default.
public int	matchConstraintMaxHeight Specify a maximum height size for the widget.
public int	matchConstraintMaxWidth Specify a maximum width size for the widget.
public int	matchConstraintMinHeight Specify a minimum height size for the widget.
public int	matchConstraintMinWidth Specify a minimum width size for the widget.
public float	matchConstraintPercentHeight Specify the percentage when using the match constraint percent mode.
public float	matchConstraintPercentWidth Specify the percentage when using the match constraint percent mode.
public int	orientation
public static final int	PARENT_ID References the id of the parent.
public static final int	RIGHT The right side of a view.
public int	rightToLeft Constrains the right side of a child to the left side of a target child (contains the target child id).
public int	rightToRight Constrains the right side of a child to the right side of a target child (contains the target child id).
public static final int	START The left side of a view in left to right languages.
public int	startToEnd Constrains the start side of a child to the end side of a target child (contains the target child id).
public int	startToStart Constrains the start side of a child to the start side of a target child (contains the target child id).
public static final int	TOP The top of a view.
public int	topToBottom Constrains the top side of a child to the bottom side of a target child (contains the target child id).
public int	topToTop Constrains the top side of a child to the top side of a target child (contains the target child id).
public static final int	UNSET Defines an id that is not set.
public static final int	VERTICAL The vertical orientation.
public float	verticalBias The ratio between two connections when the top and bottom sides are constrained.
public int	verticalChainStyle If the child is the start of a vertical chain, this attribute will drive how the elements of the chain will be positioned.
public float	verticalWeight The child's weight that we can use to distribute the available vertical space in a chain, if the dimension behaviour is set to MATCH_CONSTRAINT
public static final int	WRAP_BEHAVIOR_HORIZONTAL_ONLY
public static final int	WRAP_BEHAVIOR_INCLUDED
public static final int	WRAP_BEHAVIOR_SKIPPED
public static final int	WRAP_BEHAVIOR_VERTICAL_ONLY
public int	wrapBehaviorInParent Specify how this view is taken in account during the parent's wrap computation Can be either of: WRAP_BEHAVIOR_INCLUDED the widget is taken in account for the wrap (default) WRAP_BEHAVIOR_HORIZONTAL_ONLY the widget will be included in the wrap only horizontally WRAP_BEHAVIOR_VERTICAL_ONLY the widget will be included in the wrap only vertically WRAP_BEHAVIOR_SKIPPED the widget is not part of the wrap computation

Constructors
public	LayoutParams(Context c, AttributeSet attrs)
public	LayoutParams(ViewGroup.LayoutParams params) Create a LayoutParams base on an existing layout Params

Methods
public java.lang.String	getConstraintTag() Tag that can be used to identify a view as being a member of a group.
public ConstraintWidget	getConstraintWidget()
public void	reset() Reset the ConstraintWidget
public void	resolveLayoutDirection(int layoutDirection)
public void	setWidgetDebugName(java.lang.String text)
public void	validate() validate the layout
from java.lang.Object	clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Fields

public static final int MATCH_CONSTRAINT

Dimension will be controlled by constraints.

public static final int PARENT_ID

References the id of the parent.

public static final int UNSET

Defines an id that is not set.

public static final int GONE_UNSET

Defines an id that is not set.

public static final int HORIZONTAL

The horizontal orientation.

public static final int VERTICAL

The vertical orientation.

public static final int LEFT

The left side of a view.

public static final int RIGHT

The right side of a view.

public static final int TOP

The top of a view.

public static final int BOTTOM

The bottom side of a view.

public static final int BASELINE

The baseline of the text in a view.

public static final int START

The left side of a view in left to right languages. In right to left languages it corresponds to the right side of the view

public static final int END

The right side of a view in left to right languages. In right to left languages it corresponds to the left side of the view

public static final int CIRCLE

Circle reference from a view.

public static final int MATCH_CONSTRAINT_WRAP

Set matchConstraintDefault* default to the wrap content size. Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight

public static final int MATCH_CONSTRAINT_SPREAD

Set matchConstraintDefault* spread as much as possible within its constraints. Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight

public static final int MATCH_CONSTRAINT_PERCENT

Set matchConstraintDefault* percent to be based on a percent of another dimension (by default, the parent) Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight

public static final int CHAIN_SPREAD

Chain spread style

public static final int CHAIN_SPREAD_INSIDE

Chain spread inside style

public static final int CHAIN_PACKED

Chain packed style

public int guideBegin

The distance of child (guideline) to the top or left edge of its parent.

public int guideEnd

The distance of child (guideline) to the bottom or right edge of its parent.

public float guidePercent

The ratio of the distance to the parent's sides

public boolean guidelineUseRtl

The ratio of the distance to the parent's sides

public int leftToLeft

Constrains the left side of a child to the left side of a target child (contains the target child id).

public int leftToRight

Constrains the left side of a child to the right side of a target child (contains the target child id).

public int rightToLeft

Constrains the right side of a child to the left side of a target child (contains the target child id).

public int rightToRight

Constrains the right side of a child to the right side of a target child (contains the target child id).

public int topToTop

Constrains the top side of a child to the top side of a target child (contains the target child id).

public int topToBottom

Constrains the top side of a child to the bottom side of a target child (contains the target child id).

public int bottomToTop

Constrains the bottom side of a child to the top side of a target child (contains the target child id).

public int bottomToBottom

Constrains the bottom side of a child to the bottom side of a target child (contains the target child id).

public int baselineToBaseline

Constrains the baseline of a child to the baseline of a target child (contains the target child id).

public int baselineToTop

Constrains the baseline of a child to the top of a target child (contains the target child id).

public int baselineToBottom

Constrains the baseline of a child to the bottom of a target child (contains the target child id).

public int circleConstraint

Constrains the center of a child to the center of a target child (contains the target child id).

public int circleRadius

The radius used for a circular constraint

public float circleAngle

The angle used for a circular constraint]

public int startToEnd

Constrains the start side of a child to the end side of a target child (contains the target child id).

public int startToStart

Constrains the start side of a child to the start side of a target child (contains the target child id).

public int endToStart

Constrains the end side of a child to the start side of a target child (contains the target child id).

public int endToEnd

Constrains the end side of a child to the end side of a target child (contains the target child id).

public int goneLeftMargin

The left margin to use when the target is gone.

public int goneTopMargin

The top margin to use when the target is gone.

public int goneRightMargin

The right margin to use when the target is gone

public int goneBottomMargin

The bottom margin to use when the target is gone.

public int goneStartMargin

The start margin to use when the target is gone.

public int goneEndMargin

The end margin to use when the target is gone.

public int goneBaselineMargin

The baseline margin to use when the target is gone.

public int baselineMargin

The baseline margin.

public float horizontalBias

The ratio between two connections when the left and right (or start and end) sides are constrained.

public float verticalBias

The ratio between two connections when the top and bottom sides are constrained.

public java.lang.String dimensionRatio

The ratio information.

public float horizontalWeight

The child's weight that we can use to distribute the available horizontal space in a chain, if the dimension behaviour is set to MATCH_CONSTRAINT

public float verticalWeight

The child's weight that we can use to distribute the available vertical space in a chain, if the dimension behaviour is set to MATCH_CONSTRAINT

public int horizontalChainStyle

If the child is the start of a horizontal chain, this attribute will drive how the elements of the chain will be positioned. The possible values are:

ConstraintLayout.LayoutParams.CHAIN_SPREAD -- the elements will be spread out
ConstraintLayout.LayoutParams.CHAIN_SPREAD_INSIDE -- similar, but the endpoints of the chain will not be spread out
ConstraintLayout.LayoutParams.CHAIN_PACKED -- the elements of the chain will be packed together. The horizontal bias attribute of the child will then affect the positioning of the packed elements

public int verticalChainStyle

If the child is the start of a vertical chain, this attribute will drive how the elements of the chain will be positioned. The possible values are:

ConstraintLayout.LayoutParams.CHAIN_SPREAD -- the elements will be spread out
ConstraintLayout.LayoutParams.CHAIN_SPREAD_INSIDE -- similar, but the endpoints of the chain will not be spread out
ConstraintLayout.LayoutParams.CHAIN_PACKED -- the elements of the chain will be packed together. The vertical bias attribute of the child will then affect the positioning of the packed elements

public int matchConstraintDefaultWidth

Define how the widget horizontal dimension is handled when set to MATCH_CONSTRAINT

ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_SPREAD -- the default. The dimension will expand up to the constraints, minus margins
ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_WRAP -- DEPRECATED -- use instead WRAP_CONTENT and constrainedWidth=true
The dimension will be the same as WRAP_CONTENT, unless the size ends up too large for the constraints; in that case the dimension will expand up to the constraints, minus margins This attribute may not be applied if the widget is part of a chain in that dimension.
ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_PERCENT -- The dimension will be a percent of another widget (by default, the parent)

public int matchConstraintDefaultHeight

Define how the widget vertical dimension is handled when set to MATCH_CONSTRAINT

ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_SPREAD -- the default. The dimension will expand up to the constraints, minus margins
ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_WRAP -- DEPRECATED -- use instead WRAP_CONTENT and constrainedWidth=true
The dimension will be the same as WRAP_CONTENT, unless the size ends up too large for the constraints; in that case the dimension will expand up to the constraints, minus margins This attribute may not be applied if the widget is part of a chain in that dimension.
ConstraintLayout.LayoutParams.MATCH_CONSTRAINT_PERCENT -- The dimension will be a percent of another widget (by default, the parent)

public int matchConstraintMinWidth

Specify a minimum width size for the widget. It will only apply if the size of the widget is set to MATCH_CONSTRAINT. Don't apply if the widget is part of a horizontal chain.

public int matchConstraintMinHeight

Specify a minimum height size for the widget. It will only apply if the size of the widget is set to MATCH_CONSTRAINT. Don't apply if the widget is part of a vertical chain.

public int matchConstraintMaxWidth

Specify a maximum width size for the widget. It will only apply if the size of the widget is set to MATCH_CONSTRAINT. Don't apply if the widget is part of a horizontal chain.

public int matchConstraintMaxHeight

Specify a maximum height size for the widget. It will only apply if the size of the widget is set to MATCH_CONSTRAINT. Don't apply if the widget is part of a vertical chain.

public float matchConstraintPercentWidth

Specify the percentage when using the match constraint percent mode. From 0 to 1.

public float matchConstraintPercentHeight

Specify the percentage when using the match constraint percent mode. From 0 to 1.

public int editorAbsoluteX

The design time location of the left side of the child. Used at design time for a horizontally unconstrained child.

public int editorAbsoluteY

The design time location of the right side of the child. Used at design time for a vertically unconstrained child.

public int orientation

public boolean constrainedWidth

Specify if the horizontal dimension is constrained in case both left & right constraints are set and the widget dimension is not a fixed dimension. By default, if a widget is set to WRAP_CONTENT, we will treat that dimension as a fixed dimension, meaning the dimension will not change regardless of constraints. Setting this attribute to true allows the dimension to change in order to respect constraints.

public boolean constrainedHeight

Specify if the vertical dimension is constrained in case both top & bottom constraints are set and the widget dimension is not a fixed dimension. By default, if a widget is set to WRAP_CONTENT, we will treat that dimension as a fixed dimension, meaning the dimension will not change regardless of constraints. Setting this attribute to true allows the dimension to change in order to respect constraints.

public java.lang.String constraintTag

Define a category of view to be used by helpers and motionLayout

public static final int WRAP_BEHAVIOR_INCLUDED

public static final int WRAP_BEHAVIOR_HORIZONTAL_ONLY

public static final int WRAP_BEHAVIOR_VERTICAL_ONLY

public static final int WRAP_BEHAVIOR_SKIPPED

public int wrapBehaviorInParent

Specify how this view is taken in account during the parent's wrap computation Can be either of: WRAP_BEHAVIOR_INCLUDED the widget is taken in account for the wrap (default) WRAP_BEHAVIOR_HORIZONTAL_ONLY the widget will be included in the wrap only horizontally WRAP_BEHAVIOR_VERTICAL_ONLY the widget will be included in the wrap only vertically WRAP_BEHAVIOR_SKIPPED the widget is not part of the wrap computation

public boolean helped

Constructors

public LayoutParams(ViewGroup.LayoutParams params)

Create a LayoutParams base on an existing layout Params

Parameters:

params: the Layout Params to be copied

public LayoutParams(Context c, AttributeSet attrs)

Methods

public ConstraintWidget getConstraintWidget()

public void setWidgetDebugName(java.lang.String text)

Parameters:

text:

public void reset()

Reset the ConstraintWidget

public void validate()

validate the layout

public void resolveLayoutDirection(int layoutDirection)

public java.lang.String getConstraintTag()

Tag that can be used to identify a view as being a member of a group. Which can be used for Helpers or in MotionLayout

Returns:

tag string or null if not defined

Interfaces

Classes

Enums

ConstraintLayout.LayoutParams

Subclasses:

Overview

Summary

Fields

Constructors

Parameters:

Methods

Parameters:

Returns: