# ConstraintLayout.LayoutParams
Summary:[Constants](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#constants)\|[Fields](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#lfields)\|[Ctors](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#pubctors)\|[Methods](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#inhmethods)
# ConstraintLayout.LayoutParams
| This package is part of the Android[support library](https://developer.android.com/topic/libraries/support-library)which is no longer maintained. The Constraint Layout support library has been superseded by the[AndroidX Constraint Layout library](https://developer.android.com/reference/androidx/constraintlayout/classes), which is part of[Jetpack](https://developer.android.com/jetpack). The`ConstraintLayout.LayoutParams`class has been superseded by[`androidx.constraintlayout.widget.ConstraintLayout.LayoutParams`](https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayout.LayoutParams). We recommend using the AndroidX libraries in all new projects. You should also consider[migrating](https://developer.android.com/jetpack/androidx/migrate)existing projects to AndroidX.
`
public
static
class
ConstraintLayout.LayoutParams
`
`
``
extends MarginLayoutParams
``
`
|---|---|----------------------------------------------------------|
| java.lang.Object |||
| ↳ | ViewGroup.MarginLayoutParams ||
| | ↳ | android.support.constraint.ConstraintLayout.LayoutParams |
*** ** * ** ***
This class contains the different attributes specifying how a view want to be laid out inside a[ConstraintLayout](https://developer.android.com/reference/android/support/constraint/ConstraintLayout). For building up constraints at run time, using[ConstraintSet](https://developer.android.com/reference/android/support/constraint/ConstraintSet)is recommended.
## Summary
| ### Constants ||
|-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | [BASELINE](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#BASELINE) The baseline of the text in a view. |
| `int` | [BOTTOM](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#BOTTOM) The bottom side of a view. |
| `int` | [END](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#END) The right side of a view in right to left languages. |
| `int` | [LEFT](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#LEFT) The left side of a view. |
| `int` | [MATCH_CONSTRAINT](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#MATCH_CONSTRAINT) Dimension will be controlled by constraints. |
| `int` | [PARENT_ID](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#PARENT_ID) References the id of the parent. |
| `int` | [RIGHT](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#RIGHT) The right side of a view. |
| `int` | [START](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#START) The left side of a view in left to right languages. |
| `int` | [TOP](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#TOP) The top of a view. |
| `int` | [UNSET](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#UNSET) Defines an id that is not set. |
| ### Fields ||
|----------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` public static final int` | [CHAIN_PACKED](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#CHAIN_PACKED) Chain packed style |
| ` public static final int` | [CHAIN_SPREAD](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#CHAIN_SPREAD) Chain spread style |
| ` public static final int` | [CHAIN_SPREAD_INSIDE](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#CHAIN_SPREAD_INSIDE) Chain spread inside style |
| ` public static final int` | [HORIZONTAL](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#HORIZONTAL) The horizontal orientation. |
| ` public static final int` | [MATCH_CONSTRAINT_PERCENT](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#MATCH_CONSTRAINT_SPREAD) Set matchConstraintDefault\* spread as much as possible within its constraints. |
| ` public static final int` | [MATCH_CONSTRAINT_WRAP](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#MATCH_CONSTRAINT_WRAP) Set matchConstraintDefault\* default to the wrap content size. |
| ` public static final int` | [VERTICAL](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#VERTICAL) The vertical orientation. |
| ` public int` | [baselineToBaseline](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#baselineToBaseline) Constrains the baseline of a child to the baseline of a target child (contains the target child id). |
| ` public int` | [bottomToBottom](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#bottomToBottom) Constrains the bottom side of a child to the bottom side of a target child (contains the target child id). |
| ` public int` | [bottomToTop](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#bottomToTop) Constrains the bottom side of a child to the top side of a target child (contains the target child id). |
| ` public float` | [circleAngle](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#circleAngle) The angle used for a circular constraint\] |
| ` public int` | [circleConstraint](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#circleConstraint) Constrains the center of a child to the center of a target child (contains the target child id). |
| ` public int` | [circleRadius](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#circleRadius) The radius used for a circular constraint |
| ` public boolean` | [constrainedHeight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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 String` | [constraintTag](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#constraintTag) Define a category of view to be used by helpers and motionLayout |
| ` public String` | [dimensionRatio](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#dimensionRatio) The ratio information. |
| ` public int` | [editorAbsoluteX](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#editorAbsoluteX) The design time location of the left side of the child. |
| ` public int` | [editorAbsoluteY](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#editorAbsoluteY) The design time location of the right side of the child. |
| ` public int` | [endToEnd](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#endToEnd) Constrains the end side of a child to the end side of a target child (contains the target child id). |
| ` public int` | [endToStart](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#endToStart) Constrains the end side of a child to the start side of a target child (contains the target child id). |
| ` public int` | [goneBottomMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneBottomMargin) The bottom margin to use when the target is gone. |
| ` public int` | [goneEndMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneEndMargin) The end margin to use when the target is gone. |
| ` public int` | [goneLeftMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneLeftMargin) The left margin to use when the target is gone. |
| ` public int` | [goneRightMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneRightMargin) The right margin to use when the target is gone |
| ` public int` | [goneStartMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneStartMargin) The start margin to use when the target is gone. |
| ` public int` | [goneTopMargin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#goneTopMargin) The top margin to use when the target is gone. |
| ` public int` | [guideBegin](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#guideBegin) The distance of child (guideline) to the top or left edge of its parent. |
| ` public int` | [guideEnd](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#guideEnd) The distance of child (guideline) to the top or left edge of its parent. |
| ` public float` | [guidePercent](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#guidePercent) The ratio of the distance to the parent's sides |
| ` public boolean` | [helped](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#helped)
|
| ` public float` | [horizontalBias](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#horizontalBias) The ratio between two connections when the left and right (or start and end) sides are constrained. |
| ` public int` | [horizontalChainStyle](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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 int` | [leftToLeft](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#leftToLeft) Constrains the left side of a child to the left side of a target child (contains the target child id). |
| ` public int` | [leftToRight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#leftToRight) Constrains the left side of a child to the right side of a target child (contains the target child id). |
| ` public int` | [matchConstraintDefaultHeight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintDefaultHeight) Define how the widget vertical dimension is handled when set to MATCH_CONSTRAINT - -- the default.
|
| ` public int` | [matchConstraintDefaultWidth](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintDefaultWidth) Define how the widget horizontal dimension is handled when set to MATCH_CONSTRAINT - -- the default.
|
| ` public int` | [matchConstraintMaxHeight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintMaxHeight) Specify a maximum height size for the widget. |
| ` public int` | [matchConstraintMaxWidth](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintMaxWidth) Specify a maximum width size for the widget. |
| ` public int` | [matchConstraintMinHeight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintMinHeight) Specify a minimum height size for the widget. |
| ` public int` | [matchConstraintMinWidth](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintMinWidth) Specify a minimum width size for the widget. |
| ` public float` | [matchConstraintPercentHeight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintPercentHeight) Specify the percentage when using the match constraint percent mode. |
| ` public float` | [matchConstraintPercentWidth](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#matchConstraintPercentWidth) Specify the percentage when using the match constraint percent mode. |
| ` public int` | [orientation](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#orientation)
|
| ` public int` | [rightToLeft](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#rightToLeft) Constrains the right side of a child to the left side of a target child (contains the target child id). |
| ` public int` | [rightToRight](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#rightToRight) Constrains the right side of a child to the right side of a target child (contains the target child id). |
| ` public int` | [startToEnd](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#startToEnd) Constrains the start side of a child to the end side of a target child (contains the target child id). |
| ` public int` | [startToStart](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#startToStart) Constrains the start side of a child to the start side of a target child (contains the target child id). |
| ` public int` | [topToBottom](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#topToBottom) Constrains the top side of a child to the bottom side of a target child (contains the target child id). |
| ` public int` | [topToTop](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#topToTop) Constrains the top side of a child to the top side of a target child (contains the target child id). |
| ` public float` | [verticalBias](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#verticalBias) The ratio between two connections when the top and bottom sides are constrained. |
| ` public int` | [verticalChainStyle](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#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 constructors ||
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[ConstraintLayout.LayoutParams](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#ConstraintLayout.LayoutParams(android.support.constraint.ConstraintLayout.LayoutParams))`(`[ConstraintLayout.LayoutParams](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams)` source) ` Create a LayoutParams base on an existing layout Params |
| ` `[ConstraintLayout.LayoutParams](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#ConstraintLayout.LayoutParams(Context,%20AttributeSet))`(Context c, AttributeSet attrs) ` |
| ` `[ConstraintLayout.LayoutParams](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#ConstraintLayout.LayoutParams(ViewGroup.LayoutParams))`(ViewGroup.LayoutParams source) ` |
| ### Public methods ||
|-----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` String` | ` `[getConstraintTag](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#getConstraintTag())`() ` Tag that can be used to identify a view as being a member of a group. |
| ` void` | ` `[reset](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#reset())`() ` |
| ` void` | ` `[resolveLayoutDirection](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#resolveLayoutDirection(int))`(int layoutDirection) `
|
| ` void` | ` `[validate](https://developer.android.com/reference/android/support/constraint/ConstraintLayout.LayoutParams#validate())`() ` |
| ### Inherited methods |
|-----------------------|---|
| From class` java.lang.Object ` |-------------------|-------------------------------| | ` Object` | ` clone() ` | | ` boolean` | ` equals(Object arg0) ` | | ` void` | ` finalize() ` | | ` final Class` | ` getClass() ` | | ` int` | ` hashCode() ` | | ` final void` | ` notify() ` | | ` final void` | ` notifyAll() ` | | ` String` | ` toString() ` | | ` final void` | ` wait(long arg0, int arg1) ` | | ` final void` | ` wait(long arg0) ` | | ` final void` | ` wait() ` | ||
## Constants
### BASELINE
```
public static final int BASELINE
```
The baseline of the text in a view.
Constant Value: 5 (0x00000005)
### BOTTOM
```
public static final int BOTTOM
```
The bottom side of a view.
Constant Value: 4 (0x00000004)
### END
```
public static final int END
```
The right side of a view in right to left languages. In right to left languages it corresponds to the left side of the view
Constant Value: 7 (0x00000007)
### LEFT
```
public static final int LEFT
```
The left side of a view.
Constant Value: 1 (0x00000001)
### MATCH_CONSTRAINT
```
public static final int MATCH_CONSTRAINT
```
Dimension will be controlled by constraints.
Constant Value: 0 (0x00000000)
### PARENT_ID
```
public static final int PARENT_ID
```
References the id of the parent.
Constant Value: 0 (0x00000000)
### RIGHT
```
public static final int RIGHT
```
The right side of a view.
Constant Value: 2 (0x00000002)
### START
```
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
Constant Value: 6 (0x00000006)
### TOP
```
public static final int TOP
```
The top of a view.
Constant Value: 3 (0x00000003)
### UNSET
```
public static final int UNSET
```
Defines an id that is not set.
Constant Value: -1 (0xffffffff)
## Fields
### CHAIN_PACKED
```
public static final int CHAIN_PACKED
```
Chain packed style
### CHAIN_SPREAD
```
public static final int CHAIN_SPREAD
```
Chain spread style
### CHAIN_SPREAD_INSIDE
```
public static final int CHAIN_SPREAD_INSIDE
```
Chain spread inside style
### HORIZONTAL
```
public static final int HORIZONTAL
```
The horizontal orientation.
### MATCH_CONSTRAINT_PERCENT
```
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
### MATCH_CONSTRAINT_SPREAD
```
public static final int MATCH_CONSTRAINT_SPREAD
```
Set matchConstraintDefault\* spread as much as possible within its constraints. Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight
### MATCH_CONSTRAINT_WRAP
```
public static final int MATCH_CONSTRAINT_WRAP
```
Set matchConstraintDefault\* default to the wrap content size. Use to set the matchConstraintDefaultWidth and matchConstraintDefaultHeight
### VERTICAL
```
public static final int VERTICAL
```
The vertical orientation.
### baselineToBaseline
```
public int baselineToBaseline
```
Constrains the baseline of a child to the baseline of a target child (contains the target child id).
### bottomToBottom
```
public int bottomToBottom
```
Constrains the bottom side of a child to the bottom side of a target child (contains the target child id).
### bottomToTop
```
public int bottomToTop
```
Constrains the bottom side of a child to the top side of a target child (contains the target child id).
### circleAngle
```
public float circleAngle
```
The angle used for a circular constraint\]
### circleConstraint
```
public int circleConstraint
```
Constrains the center of a child to the center of a target child (contains the target child id).
### circleRadius
```
public int circleRadius
```
The radius used for a circular constraint
### constrainedHeight
```
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.
### constrainedWidth
```
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.
### constraintTag
```
public String constraintTag
```
Define a category of view to be used by helpers and motionLayout
### dimensionRatio
```
public String dimensionRatio
```
The ratio information.
### editorAbsoluteX
```
public int editorAbsoluteX
```
The design time location of the left side of the child. Used at design time for a horizontally unconstrained child.
### editorAbsoluteY
```
public int editorAbsoluteY
```
The design time location of the right side of the child. Used at design time for a vertically unconstrained child.
### endToEnd
```
public int endToEnd
```
Constrains the end side of a child to the end side of a target child (contains the target child id).
### endToStart
```
public int endToStart
```
Constrains the end side of a child to the start side of a target child (contains the target child id).
### goneBottomMargin
```
public int goneBottomMargin
```
The bottom margin to use when the target is gone.
### goneEndMargin
```
public int goneEndMargin
```
The end margin to use when the target is gone.
### goneLeftMargin
```
public int goneLeftMargin
```
The left margin to use when the target is gone.
### goneRightMargin
```
public int goneRightMargin
```
The right margin to use when the target is gone
### goneStartMargin
```
public int goneStartMargin
```
The start margin to use when the target is gone.
### goneTopMargin
```
public int goneTopMargin
```
The top margin to use when the target is gone.
### guideBegin
```
public int guideBegin
```
The distance of child (guideline) to the top or left edge of its parent.
### guideEnd
```
public int guideEnd
```
The distance of child (guideline) to the top or left edge of its parent.
### guidePercent
```
public float guidePercent
```
The ratio of the distance to the parent's sides
### helped
```
public boolean helped
```
### horizontalBias
```
public float horizontalBias
```
The ratio between two connections when the left and right (or start and end) sides are constrained.
### horizontalChainStyle
```
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:
- -- the elements will be spread out
- -- similar, but the endpoints of the chain will not be spread out
- -- 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
**See also:**
- [ERROR(/CHAIN_SPREAD)](https://developer.android.com/)
- [ERROR(/CHAIN_SPREAD_INSIDE)](https://developer.android.com/)
- [ERROR(/CHAIN_PACKED)](https://developer.android.com/)
### horizontalWeight
```
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
### leftToLeft
```
public int leftToLeft
```
Constrains the left side of a child to the left side of a target child (contains the target child id).
### leftToRight
```
public int leftToRight
```
Constrains the left side of a child to the right side of a target child (contains the target child id).
### matchConstraintDefaultHeight
```
public int matchConstraintDefaultHeight
```
Define how the widget vertical dimension is handled when set to MATCH_CONSTRAINT
- -- the default. The dimension will expand up to the constraints, minus margins
- -- DEPRECATED -- use instead WRAP_CONTENT and constrainedHeight=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.
- -- The dimension will be a percent of another widget (by default, the parent)
**See also:**
- [ERROR(/MATCH_CONSTRAINT_SPREAD)](https://developer.android.com/)
- [ERROR(/MATCH_CONSTRAINT_WRAP)](https://developer.android.com/)
- [ERROR(/MATCH_CONSTRAINT_PERCENT)](https://developer.android.com/)
### matchConstraintDefaultWidth
```
public int matchConstraintDefaultWidth
```
Define how the widget horizontal dimension is handled when set to MATCH_CONSTRAINT
- -- the default. The dimension will expand up to the constraints, minus margins
- -- 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.
- -- The dimension will be a percent of another widget (by default, the parent)
**See also:**
- [ERROR(/MATCH_CONSTRAINT_SPREAD)](https://developer.android.com/)
- [ERROR(/MATCH_CONSTRAINT_WRAP)](https://developer.android.com/)
- [ERROR(/MATCH_CONSTRAINT_PERCENT)](https://developer.android.com/)
### matchConstraintMaxHeight
```
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 an vertical chain.
### matchConstraintMaxWidth
```
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 an horizontal chain.
### matchConstraintMinHeight
```
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 an vertical chain.
### matchConstraintMinWidth
```
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 an horizontal chain.
### matchConstraintPercentHeight
```
public float matchConstraintPercentHeight
```
Specify the percentage when using the match constraint percent mode. From 0 to 1.
### matchConstraintPercentWidth
```
public float matchConstraintPercentWidth
```
Specify the percentage when using the match constraint percent mode. From 0 to 1.
### orientation
```
public int orientation
```
### rightToLeft
```
public int rightToLeft
```
Constrains the right side of a child to the left side of a target child (contains the target child id).
### rightToRight
```
public int rightToRight
```
Constrains the right side of a child to the right side of a target child (contains the target child id).
### startToEnd
```
public int startToEnd
```
Constrains the start side of a child to the end side of a target child (contains the target child id).
### startToStart
```
public int startToStart
```
Constrains the start side of a child to the start side of a target child (contains the target child id).
### topToBottom
```
public int topToBottom
```
Constrains the top side of a child to the bottom side of a target child (contains the target child id).
### topToTop
```
public int topToTop
```
Constrains the top side of a child to the top side of a target child (contains the target child id).
### verticalBias
```
public float verticalBias
```
The ratio between two connections when the top and bottom sides are constrained.
### verticalChainStyle
```
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:
- -- the elements will be spread out
- -- similar, but the endpoints of the chain will not be spread out
- -- 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
**See also:**
- [ERROR(/CHAIN_SPREAD)](https://developer.android.com/)
- [ERROR(/CHAIN_SPREAD_INSIDE)](https://developer.android.com/)
- [ERROR(/CHAIN_PACKED)](https://developer.android.com/)
### verticalWeight
```
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 constructors
### ConstraintLayout.LayoutParams
```
public ConstraintLayout.LayoutParams (ConstraintLayout.LayoutParams source)
```
Create a LayoutParams base on an existing layout Params
| Parameters ||
|----------|------------------------------------------------------------------------|
| `source` | `ConstraintLayout.LayoutParams`: the Layout Params to be copied
|
### ConstraintLayout.LayoutParams
```
public ConstraintLayout.LayoutParams (Context c,
AttributeSet attrs)
```
| Parameters ||
|---------|-----------------------|
| `c` | `Context`
|
| `attrs` | `AttributeSet`
|
### ConstraintLayout.LayoutParams
```
public ConstraintLayout.LayoutParams (ViewGroup.LayoutParams source)
```
| Parameters ||
|----------|---------------------------------|
| `source` | `ViewGroup.LayoutParams`
|
## Public methods
### getConstraintTag
```
public 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 ||
|----------|------------------------------------------|
| `String` | tag string or null if not defined
|
### reset
```
public void reset ()
```
### resolveLayoutDirection
```
public void resolveLayoutDirection (int layoutDirection)
```
| Parameters ||
|-------------------|--------------|
| `layoutDirection` | `int`
|
### validate
```
public void validate ()
```