ConstraintSet

public class ConstraintSet
extends Object

java.lang.Object
   ↳ android.support.constraint.ConstraintSet


This class allows you to define programmatically a set of constraints to be used with ConstraintLayout. It lets you create and save constraints, and apply them to an existing ConstraintLayout. ConstraintsSet can be created in various ways:

  • Manually
    c = new ConstraintSet(); c.connect(....);
  • from a R.layout.* object
    c.clone(context, R.layout.layout1);
  • from a ConstraintLayout
    c.clone(clayout);

Example code:

import android.content.Context;
import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
import android.support.constraint.ConstraintSet;
import android.support.transition.TransitionManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    ConstraintSet mConstraintSet1 = new ConstraintSet(); // create a Constraint Set
    ConstraintSet mConstraintSet2 = new ConstraintSet(); // create a Constraint Set
    ConstraintLayout mConstraintLayout; // cache the ConstraintLayout
    boolean mOld = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Context context = this;
        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
    }

    public void foo(View view) {
        TransitionManager.beginDelayedTransition(mConstraintLayout);
        if (mOld = !mOld) {
            mConstraintSet1.applyTo(mConstraintLayout); // set new constraints
        }  else {
            mConstraintSet2.applyTo(mConstraintLayout); // set new constraints
        }
    }
}

Summary

Constants

int BASELINE

The baseline of the text in a view.

int BOTTOM

The bottom side of a view.

int END

The right side of a view in right to left languages.

int GONE

This view is gone, and will not take any space for layout purposes.

int HORIZONTAL_GUIDELINE

Used to create a horizontal create guidelines.

int INVISIBLE

This view is invisible, but it still takes up space for layout purposes.

int LEFT

The left side of a view.

int MATCH_CONSTRAINT

Dimension will be controlled by constraints

int PARENT_ID

References the id of the parent.

int RIGHT

The right side of a view.

int START

The left side of a view in left to right languages.

int TOP

The top of a view.

int UNSET

Used to indicate a parameter is cleared or not set

int VERTICAL_GUIDELINE

Used to create a vertical create guidelines.

int VISIBLE

This view is visible.

int WRAP_CONTENT

Dimension will set by the view's content

Fields

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 HORIZONTAL

The horizontal orientation.

public static final int MATCH_CONSTRAINT_SPREAD

Calculate the size of a view in 0 dp by reducing the constrains gaps as much as possible

public static final int MATCH_CONSTRAINT_WRAP

How to calculate the size of a view in 0 dp by using its wrap_content size

public static final int VERTICAL

The vertical orientation.

Public constructors

ConstraintSet()

Public methods

void addColorAttributes(String... attributeName)
void addFloatAttributes(String... attributeName)
void addIntAttributes(String... attributeName)
void addStringAttributes(String... attributeName)
void addToHorizontalChain(int viewId, int leftId, int rightId)

Adds a view to a horizontal chain.

void addToHorizontalChainRTL(int viewId, int leftId, int rightId)

Adds a view to a horizontal chain.

void addToVerticalChain(int viewId, int topId, int bottomId)

Adds a view to a vertical chain.

void applyTo(ConstraintLayout constraintLayout)

Apply the constraints to a ConstraintLayout.

void center(int centerID, int firstID, int firstSide, int firstMargin, int secondId, int secondSide, int secondMargin, float bias)

Center widget between the other two widgets.

void centerHorizontally(int centerID, int leftId, int leftSide, int leftMargin, int rightId, int rightSide, int rightMargin, float bias)

Centers the widget horizontally to the left and right side on another widgets sides.

void centerHorizontally(int viewId, int toView)

Centers the view horizontally relative to toView's position.

void centerHorizontallyRtl(int viewId, int toView)

Centers the view horizontally relative to toView's position.

void centerHorizontallyRtl(int centerID, int startId, int startSide, int startMargin, int endId, int endSide, int endMargin, float bias)

Centers the widgets horizontally to the left and right side on another widgets sides.

void centerVertically(int viewId, int toView)

Centers the view vertically relative to toView's position.

void centerVertically(int centerID, int topId, int topSide, int topMargin, int bottomId, int bottomSide, int bottomMargin, float bias)

Centers the widgets Vertically to the top and bottom side on another widgets sides.

void clear(int viewId, int anchor)

Remove a constraint from this view.

void clear(int viewId)

Remove all constraints from this view.

void clone(ConstraintLayout constraintLayout)

Copy the layout parameters of a ConstraintLayout.

void clone(Constraints constraints)

Copy the layout parameters of a ConstraintLayout.

void clone(ConstraintSet set)

Copy the constraints from a layout.

void clone(Context context, int constraintLayoutId)

Copy the constraints from a layout.

void connect(int startID, int startSide, int endID, int endSide, int margin)

Create a constraint between two widgets.

void connect(int startID, int startSide, int endID, int endSide)

Create a constraint between two widgets.

void constrainCircle(int viewId, int id, int radius, float angle)

Constrain the view on a circle constraint

void constrainDefaultHeight(int viewId, int height)

Sets how the height is calculated ether MATCH_CONSTRAINT_WRAP or MATCH_CONSTRAINT_SPREAD.

void constrainDefaultWidth(int viewId, int width)

Sets how the width is calculated ether MATCH_CONSTRAINT_WRAP or MATCH_CONSTRAINT_SPREAD.

void constrainHeight(int viewId, int height)

Sets the height of the view.

void constrainMaxHeight(int viewId, int height)

Sets the maximum height of the view.

void constrainMaxWidth(int viewId, int width)

Sets the maximum width of the view.

void constrainMinHeight(int viewId, int height)

Sets the height of the view.

void constrainMinWidth(int viewId, int width)

Sets the width of the view.

void constrainPercentHeight(int viewId, float percent)

Sets the height of the view as a percentage of the parent.

void constrainPercentWidth(int viewId, float percent)

Sets the width of the view as a percentage of the parent.

void constrainWidth(int viewId, int width)

Sets the width of the view.

void create(int guidelineID, int orientation)

Creates a ConstraintLayout virtual object.

void createBarrier(int id, int direction, int... referenced)

Creates a ConstraintLayout Barrier object.

void createHorizontalChain(int leftId, int leftSide, int rightId, int rightSide, int[] chainIds, float[] weights, int style)

Spaces a set of widgets horizontal between the view startID and endId.

void createHorizontalChainRtl(int startId, int startSide, int endId, int endSide, int[] chainIds, float[] weights, int style)

Spaces a set of widgets horizontal between the view startID and endId.

void createVerticalChain(int topId, int topSide, int bottomId, int bottomSide, int[] chainIds, float[] weights, int style)

Spaces a set of widgets vertically between the view topId and bottomId.

boolean getApplyElevation(int viewId)

return with the constraint set will apply elevation for the specified view.

HashMap<StringConstraintAttribute> getCustomAttributeSet()
ConstraintSet.Constraint getParameters(int mId)
void load(Context context, XmlPullParser parser)

Load a constraint set from a constraintSet.xml file

void load(Context context, int resourceId)

Load a constraint set from a constraintSet.xml file.

void parseColorAttributes(ConstraintSet.Constraint set, String attributes)
void parseFloatAttributes(ConstraintSet.Constraint set, String attributes)
void parseIntAttributes(ConstraintSet.Constraint set, String attributes)
void parseStringAttributes(ConstraintSet.Constraint set, String attributes)
void readFallback(ConstraintLayout constraintLayout)
void removeAttribute(String attributeName)
void removeFromHorizontalChain(int viewId)

Removes a view from a horizontal chain.

void removeFromVerticalChain(int viewId)

Removes a view from a vertical chain.

void setAlpha(int viewId, float alpha)

Adjust the alpha of a view.

void setApplyElevation(int viewId, boolean apply)

set if elevation will be applied to the view.

void setBarrierType(int id, int type)
void setColorValue(int viewId, String attributeName, int value)
void setDimensionRatio(int viewId, String ratio)

Constrains the views aspect ratio.

void setElevation(int viewId, float elevation)

Adjust the elevation of a view.

void setFloatValue(int viewId, String attributeName, float value)
void setGoneMargin(int viewId, int anchor, int value)

Sets the gone margin.

void setGuidelineBegin(int guidelineID, int margin)

Set the guideline's distance form the top or left edge.

void setGuidelineEnd(int guidelineID, int margin)

Set a guideline's distance to end.

void setGuidelinePercent(int guidelineID, float ratio)

Set a Guideline's percent.

void setHorizontalBias(int viewId, float bias)

Adjust the horizontal bias of the view (used with views constrained on left and right).

void setHorizontalChainStyle(int viewId, int chainStyle)

How the elements of the horizontal chain will be positioned.

void setHorizontalWeight(int viewId, float weight)

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

void setIntValue(int viewId, String attributeName, int value)
void setMargin(int viewId, int anchor, int value)

Sets the margin.

void setRotation(int viewId, float rotation)

Adjust the post-layout rotation about the Z axis of a view.

void setRotationX(int viewId, float rotationX)

Adjust the post-layout rotation about the X axis of a view.

void setRotationY(int viewId, float rotationY)

Adjust the post-layout rotation about the Y axis of a view.

void setScaleX(int viewId, float scaleX)

Adjust the post-layout scale in X of a view.

void setScaleY(int viewId, float scaleY)

Adjust the post-layout scale in Y of a view.

void setStringValue(int viewId, String attributeName, String value)
void setTransformPivot(int viewId, float transformPivotX, float transformPivotY)

Set X,Y location of the pivot point around which the view will rotate and scale.

void setTransformPivotX(int viewId, float transformPivotX)

Set X location of the pivot point around which the view will rotate and scale.

void setTransformPivotY(int viewId, float transformPivotY)

Set Y location of the pivot point around which the view will rotate and scale.

void setTranslation(int viewId, float translationX, float translationY)

Adjust the post-layout translation of a view.

void setTranslationX(int viewId, float translationX)

Adjust the post-layout X translation of a view.

void setTranslationY(int viewId, float translationY)

Adjust the post-layout Y translation of a view.

void setTranslationZ(int viewId, float translationZ)

Adjust the translation in Z of a view.

void setVerticalBias(int viewId, float bias)

Adjust the vertical bias of the view (used with views constrained on left and right).

void setVerticalChainStyle(int viewId, int chainStyle)

How the elements of the vertical chain will be positioned.

void setVerticalWeight(int viewId, float weight)

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

void setVisibility(int viewId, int visibility)

Adjust the visibility of a view.

Inherited methods

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)

GONE

public static final int GONE

This view is gone, and will not take any space for layout purposes. Use with setVisibility(int, int) and android:visibility.

Constant Value: 8 (0x00000008)

HORIZONTAL_GUIDELINE

public static final int HORIZONTAL_GUIDELINE

Used to create a horizontal create guidelines.

Constant Value: 0 (0x00000000)

INVISIBLE

public static final int INVISIBLE

This view is invisible, but it still takes up space for layout purposes. Use with setVisibility(int, int) and android:visibility.

Constant Value: 4 (0x00000004)

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. Used in:

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

Used to indicate a parameter is cleared or not set

Constant Value: -1 (0xffffffff)

VERTICAL_GUIDELINE

public static final int VERTICAL_GUIDELINE

Used to create a vertical create guidelines. see create(int, int)

Constant Value: 1 (0x00000001)

VISIBLE

public static final int VISIBLE

This view is visible. Use with setVisibility(int, int) and android:visibility.

Constant Value: 0 (0x00000000)

WRAP_CONTENT

public static final int WRAP_CONTENT

Dimension will set by the view's content

Constant Value: -2 (0xfffffffe)

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_SPREAD

public static final int MATCH_CONSTRAINT_SPREAD

Calculate the size of a view in 0 dp by reducing the constrains gaps as much as possible

MATCH_CONSTRAINT_WRAP

public static final int MATCH_CONSTRAINT_WRAP

How to calculate the size of a view in 0 dp by using its wrap_content size

VERTICAL

public static final int VERTICAL

The vertical orientation.

Public constructors

ConstraintSet

public ConstraintSet ()

Public methods

addColorAttributes

public void addColorAttributes (String... attributeName)

Parameters
attributeName String

addFloatAttributes

public void addFloatAttributes (String... attributeName)

Parameters
attributeName String

addIntAttributes

public void addIntAttributes (String... attributeName)

Parameters
attributeName String

addStringAttributes

public void addStringAttributes (String... attributeName)

Parameters
attributeName String

addToHorizontalChain

public void addToHorizontalChain (int viewId, 
                int leftId, 
                int rightId)

Adds a view to a horizontal chain.

Parameters
viewId int: view to add

leftId int: view in chain to the left

rightId int: view in chain to the right

addToHorizontalChainRTL

public void addToHorizontalChainRTL (int viewId, 
                int leftId, 
                int rightId)

Adds a view to a horizontal chain.

Parameters
viewId int: view to add

leftId int: view to the start side

rightId int: view to the end side

addToVerticalChain

public void addToVerticalChain (int viewId, 
                int topId, 
                int bottomId)

Adds a view to a vertical chain.

Parameters
viewId int: view to add to a vertical chain

topId int: view above.

bottomId int: view below

applyTo

public void applyTo (ConstraintLayout constraintLayout)

Apply the constraints to a ConstraintLayout.

Parameters
constraintLayout ConstraintLayout: to be modified

center

public void center (int centerID, 
                int firstID, 
                int firstSide, 
                int firstMargin, 
                int secondId, 
                int secondSide, 
                int secondMargin, 
                float bias)

Center widget between the other two widgets.

Parameters
centerID int: ID of the widget to be centered

firstID int: ID of the first widget to connect the left or top of the widget to

firstSide int: the side of the widget to connect to

firstMargin int: the connection margin

secondId int: the ID of the second widget to connect to right or top of the widget to

secondSide int: the side of the widget to connect to

secondMargin int: the connection margin

bias float: the ratio between two connections

centerHorizontally

public void centerHorizontally (int centerID, 
                int leftId, 
                int leftSide, 
                int leftMargin, 
                int rightId, 
                int rightSide, 
                int rightMargin, 
                float bias)

Centers the widget horizontally to the left and right side on another widgets sides.

Parameters
centerID int: ID of widget to be centered

leftId int: The Id of the widget on the left side

leftSide int: The side of the leftId widget to connect to

leftMargin int: The margin on the left side

rightId int: The Id of the widget on the right side

rightSide int: The side of the rightId widget to connect to

rightMargin int: The margin on the right side

bias float: The ratio of the space on the left vs. right sides 0.5 is centered (default)

centerHorizontally

public void centerHorizontally (int viewId, 
                int toView)

Centers the view horizontally relative to toView's position.

Parameters
viewId int: ID of view to center Horizontally

toView int: ID of view to center on (or in)

centerHorizontallyRtl

public void centerHorizontallyRtl (int viewId, 
                int toView)

Centers the view horizontally relative to toView's position.

Parameters
viewId int: ID of view to center Horizontally

toView int: ID of view to center on (or in)

centerHorizontallyRtl

public void centerHorizontallyRtl (int centerID, 
                int startId, 
                int startSide, 
                int startMargin, 
                int endId, 
                int endSide, 
                int endMargin, 
                float bias)

Centers the widgets horizontally to the left and right side on another widgets sides.

Parameters
centerID int: ID of widget to be centered

startId int: The Id of the widget on the start side (left in non rtl languages)

startSide int: The side of the startId widget to connect to

startMargin int: The margin on the start side

endId int: The Id of the widget on the start side (left in non rtl languages)

endSide int: The side of the endId widget to connect to

endMargin int: The margin on the end side

bias float: The ratio of the space on the start vs end side 0.5 is centered (default)

centerVertically

public void centerVertically (int viewId, 
                int toView)

Centers the view vertically relative to toView's position.

Parameters
viewId int: ID of view to center Horizontally

toView int: ID of view to center on (or in)

centerVertically

public void centerVertically (int centerID, 
                int topId, 
                int topSide, 
                int topMargin, 
                int bottomId, 
                int bottomSide, 
                int bottomMargin, 
                float bias)

Centers the widgets Vertically to the top and bottom side on another widgets sides.

Parameters
centerID int: ID of widget to be centered

topId int: The Id of the widget on the top side

topSide int: The side of the leftId widget to connect to

topMargin int: The margin on the top side

bottomId int: The Id of the widget on the bottom side

bottomSide int: The side of the bottomId widget to connect to

bottomMargin int: The margin on the bottom side

bias float: The ratio of the space on the top vs. bottom sides 0.5 is centered (default)

clear

public void clear (int viewId, 
                int anchor)

Remove a constraint from this view.

Parameters
viewId int: ID of view to center on (or in)

anchor int: the Anchor to remove constraint from

clear

public void clear (int viewId)

Remove all constraints from this view.

Parameters
viewId int: ID of view to remove all connections to

clone

public void clone (ConstraintLayout constraintLayout)

Copy the layout parameters of a ConstraintLayout.

Parameters
constraintLayout ConstraintLayout: The ConstraintLayout to be copied

clone

public void clone (Constraints constraints)

Copy the layout parameters of a ConstraintLayout.

Parameters
constraints Constraints: The ConstraintLayout to be copied

clone

public void clone (ConstraintSet set)

Copy the constraints from a layout.

Parameters
set ConstraintSet: constraint set to copy

clone

public void clone (Context context, 
                int constraintLayoutId)

Copy the constraints from a layout.

Parameters
context Context: the context for the layout inflation

constraintLayoutId int: the id of the layout file

connect

public void connect (int startID, 
                int startSide, 
                int endID, 
                int endSide, 
                int margin)

Create a constraint between two widgets.

Parameters
startID int: the ID of the widget to be constrained

startSide int: the side of the widget to constrain

endID int: the id of the widget to constrain to

endSide int: the side of widget to constrain to

margin int: the margin to constrain (margin must be positive)

connect

public void connect (int startID, 
                int startSide, 
                int endID, 
                int endSide)

Create a constraint between two widgets.

Parameters
startID int: the ID of the widget to be constrained

startSide int: the side of the widget to constrain

endID int: the id of the widget to constrain to

endSide int: the side of widget to constrain to

constrainCircle

public void constrainCircle (int viewId, 
                int id, 
                int radius, 
                float angle)

Constrain the view on a circle constraint

Parameters
viewId int: ID of the view we constrain

id int: ID of the view we constrain relative to

radius int: the radius of the circle in degrees

angle float: the angle

constrainDefaultHeight

public void constrainDefaultHeight (int viewId, 
                int height)

Sets how the height is calculated ether MATCH_CONSTRAINT_WRAP or MATCH_CONSTRAINT_SPREAD. Default is spread.

Parameters
viewId int: ID of view to adjust its matchConstraintDefaultHeight

height int: MATCH_CONSTRAINT_WRAP or MATCH_CONSTRAINT_SPREAD

constrainDefaultWidth

public void constrainDefaultWidth (int viewId, 
                int width)

Sets how the width is calculated ether MATCH_CONSTRAINT_WRAP or MATCH_CONSTRAINT_SPREAD. Default is spread.

Parameters
viewId int: ID of view to adjust its matchConstraintDefaultWidth

width int: SPREAD or WRAP

constrainHeight

public void constrainHeight (int viewId, 
                int height)

Sets the height of the view. It can be a dimension, WRAP_CONTENT or MATCH_CONSTRAINT.

Parameters
viewId int: ID of view to adjust its height

height int: the height of the view

constrainMaxHeight

public void constrainMaxHeight (int viewId, 
                int height)

Sets the maximum height of the view. It is a dimension, It is only applicable if height is #MATCH_CONSTRAINT}.

Parameters
viewId int: ID of view to adjust it height

height int: the maximum height of the constraint

constrainMaxWidth

public void constrainMaxWidth (int viewId, 
                int width)

Sets the maximum width of the view. It is a dimension, It is only applicable if width is #MATCH_CONSTRAINT}.

Parameters
viewId int: ID of view to adjust its max height

width int: the maximum width of the view

constrainMinHeight

public void constrainMinHeight (int viewId, 
                int height)

Sets the height of the view. It is a dimension, It is only applicable if height is #MATCH_CONSTRAINT}.

Parameters
viewId int: ID of view to adjust its min height

height int: the minimum height of the view

constrainMinWidth

public void constrainMinWidth (int viewId, 
                int width)

Sets the width of the view. It is a dimension, It is only applicable if width is #MATCH_CONSTRAINT}.

Parameters
viewId int: ID of view to adjust its min height

width int: the minimum width of the view

constrainPercentHeight

public void constrainPercentHeight (int viewId, 
                float percent)

Sets the height of the view as a percentage of the parent.

constrainPercentWidth

public void constrainPercentWidth (int viewId, 
                float percent)

Sets the width of the view as a percentage of the parent.

constrainWidth

public void constrainWidth (int viewId, 
                int width)

Sets the width of the view. It can be a dimension, WRAP_CONTENT or MATCH_CONSTRAINT.

Parameters
viewId int: ID of view to adjust its width

width int: the width of the view

create

public void create (int guidelineID, 
                int orientation)

Creates a ConstraintLayout virtual object. Currently only horizontal or vertical GuideLines.

Parameters
guidelineID int: ID of guideline to create

orientation int: the Orientation of the guideline

createBarrier

public void createBarrier (int id, 
                int direction, 
                int... referenced)

Creates a ConstraintLayout Barrier object.

Parameters
direction int: Barrier.{LEFT,RIGHT,TOP,BOTTOM,START,END}

createHorizontalChain

public void createHorizontalChain (int leftId, 
                int leftSide, 
                int rightId, 
                int rightSide, 
                int[] chainIds, 
                float[] weights, 
                int style)

Spaces a set of widgets horizontal between the view startID and endId. Widgets can be spaced with weights.

Parameters
leftId int: The id of the widget to connect to or PARENT_ID

leftSide int: the side of the start to connect to

rightId int: The id of the widget to connect to or PARENT_ID

rightSide int: the side of the right to connect to

chainIds int: The widgets in the chain

weights float: The weight to assign to each element in the chain or null

style int: The type of chain

createHorizontalChainRtl

public void createHorizontalChainRtl (int startId, 
                int startSide, 
                int endId, 
                int endSide, 
                int[] chainIds, 
                float[] weights, 
                int style)

Spaces a set of widgets horizontal between the view startID and endId. Widgets can be spaced with weights.

Parameters
startId int: The id of the widget to connect to or PARENT_ID

startSide int: the side of the start to connect to

endId int: The id of the widget to connect to or PARENT_ID

endSide int: the side of the end to connect to

chainIds int: The widgets in the chain

weights float: The weight to assign to each element in the chain or null

style int: The type of chain

createVerticalChain

public void createVerticalChain (int topId, 
                int topSide, 
                int bottomId, 
                int bottomSide, 
                int[] chainIds, 
                float[] weights, 
                int style)

Spaces a set of widgets vertically between the view topId and bottomId. Widgets can be spaced with weights.

Parameters
topId int: The id of the widget to connect to or PARENT_ID

topSide int: the side of the start to connect to

bottomId int: The id of the widget to connect to or PARENT_ID

bottomSide int: the side of the right to connect to

chainIds int: widgets to use as a chain

weights float: can be null

style int: set the style of the chain

getApplyElevation

public boolean getApplyElevation (int viewId)

return with the constraint set will apply elevation for the specified view.

Parameters
viewId int

Returns
boolean true if the elevation will be set on this view (default is false)

getCustomAttributeSet

public HashMap<StringConstraintAttribute> getCustomAttributeSet ()

Returns
HashMap<StringConstraintAttribute>

getParameters

public ConstraintSet.Constraint getParameters (int mId)

Parameters
mId int

Returns
ConstraintSet.Constraint

load

public void load (Context context, 
                XmlPullParser parser)

Load a constraint set from a constraintSet.xml file

Parameters
context Context: the context for the inflation

parser XmlPullParser: id of xml file in res/xml/

load

public void load (Context context, 
                int resourceId)

Load a constraint set from a constraintSet.xml file. Note. Do NOT use this to load a layout file. It will fail silently as there is no efficient way to differentiate.

Parameters
context Context: the context for the inflation

resourceId int: id of xml file in res/xml/

parseColorAttributes

public void parseColorAttributes (ConstraintSet.Constraint set, 
                String attributes)

Parameters
set ConstraintSet.Constraint

attributes String

parseFloatAttributes

public void parseFloatAttributes (ConstraintSet.Constraint set, 
                String attributes)

Parameters
set ConstraintSet.Constraint

attributes String

parseIntAttributes

public void parseIntAttributes (ConstraintSet.Constraint set, 
                String attributes)

Parameters
set ConstraintSet.Constraint

attributes String

parseStringAttributes

public void parseStringAttributes (ConstraintSet.Constraint set, 
                String attributes)

Parameters
set ConstraintSet.Constraint

attributes String

readFallback

public void readFallback (ConstraintLayout constraintLayout)

Parameters
constraintLayout ConstraintLayout

removeAttribute

public void removeAttribute (String attributeName)

Parameters
attributeName String

removeFromHorizontalChain

public void removeFromHorizontalChain (int viewId)

Removes a view from a horizontal chain. This assumes the view is connected to a horizontal chain. Its behaviour is undefined if not part of a horizontal chain.

Parameters
viewId int: the view to be removed

removeFromVerticalChain

public void removeFromVerticalChain (int viewId)

Removes a view from a vertical chain. This assumes the view is connected to a vertical chain. Its behaviour is undefined if not part of a vertical chain.

Parameters
viewId int: the view to be removed

setAlpha

public void setAlpha (int viewId, 
                float alpha)

Adjust the alpha of a view.

Parameters
viewId int: ID of view to adjust the vertical

alpha float: the alpha

setApplyElevation

public void setApplyElevation (int viewId, 
                boolean apply)

set if elevation will be applied to the view. Elevation logic is based on style and animation. By default it is not used because it would lead to unexpected results.

Parameters
viewId int

apply boolean: true if this constraint set applies elevation to this view

setBarrierType

public void setBarrierType (int id, 
                int type)

Parameters
id int

type int

setColorValue

public void setColorValue (int viewId, 
                String attributeName, 
                int value)

Parameters
viewId int

attributeName String

value int

setDimensionRatio

public void setDimensionRatio (int viewId, 
                String ratio)

Constrains the views aspect ratio. For Example a HD screen is 16 by 9 = 16/(float)9 = 1.777f.

Parameters
viewId int: ID of view to constrain

ratio String: The ratio of the width to height (width / height)

setElevation

public void setElevation (int viewId, 
                float elevation)

Adjust the elevation of a view.

Parameters
viewId int: ID of view to adjust the elevation

elevation float: the elevation

setFloatValue

public void setFloatValue (int viewId, 
                String attributeName, 
                float value)

Parameters
viewId int

attributeName String

value float

setGoneMargin

public void setGoneMargin (int viewId, 
                int anchor, 
                int value)

Sets the gone margin.

Parameters
viewId int: ID of view to adjust the margin on

anchor int: The side to adjust the margin on

value int: The new value for the margin

setGuidelineBegin

public void setGuidelineBegin (int guidelineID, 
                int margin)

Set the guideline's distance form the top or left edge.

Parameters
guidelineID int: ID of the guideline

margin int: the distance to the top or left edge

setGuidelineEnd

public void setGuidelineEnd (int guidelineID, 
                int margin)

Set a guideline's distance to end.

Parameters
guidelineID int: ID of the guideline

margin int: the margin to the right or bottom side of container

setGuidelinePercent

public void setGuidelinePercent (int guidelineID, 
                float ratio)

Set a Guideline's percent.

Parameters
guidelineID int: ID of the guideline

ratio float: the ratio between the gap on the left and right 0.0 is top/left 0.5 is middle

setHorizontalBias

public void setHorizontalBias (int viewId, 
                float bias)

Adjust the horizontal bias of the view (used with views constrained on left and right).

Parameters
viewId int: ID of view to adjust the horizontal

bias float: the new bias 0.5 is in the middle

setHorizontalChainStyle

public void setHorizontalChainStyle (int viewId, 
                int chainStyle)

How the elements of the horizontal chain will be positioned. if the dimension behaviour is set to MATCH_CONSTRAINT. 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

Parameters
viewId int: ID of view to adjust its HorizontalChainStyle

chainStyle int: the weight that we can use to distribute the horizontal space

setHorizontalWeight

public void setHorizontalWeight (int viewId, 
                float weight)

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

Parameters
viewId int: ID of view to adjust its HorizontalWeight

weight float: the weight that we can use to distribute the horizontal space

setIntValue

public void setIntValue (int viewId, 
                String attributeName, 
                int value)

Parameters
viewId int

attributeName String

value int

setMargin

public void setMargin (int viewId, 
                int anchor, 
                int value)

Sets the margin.

Parameters
viewId int: ID of view to adjust the margin on

anchor int: The side to adjust the margin on

value int: The new value for the margin

setRotation

public void setRotation (int viewId, 
                float rotation)

Adjust the post-layout rotation about the Z axis of a view.

Parameters
viewId int: ID of view to adjust th Z rotation

rotation float: the rotation about the X axis

setRotationX

public void setRotationX (int viewId, 
                float rotationX)

Adjust the post-layout rotation about the X axis of a view.

Parameters
viewId int: ID of view to adjust th X rotation

rotationX float: the rotation about the X axis

setRotationY

public void setRotationY (int viewId, 
                float rotationY)

Adjust the post-layout rotation about the Y axis of a view.

Parameters
viewId int: ID of view to adjust the Y rotation

rotationY float: the rotationY

setScaleX

public void setScaleX (int viewId, 
                float scaleX)

Adjust the post-layout scale in X of a view.

Parameters
viewId int: ID of view to adjust the scale in X

scaleX float: the scale in X

setScaleY

public void setScaleY (int viewId, 
                float scaleY)

Adjust the post-layout scale in Y of a view.

Parameters
viewId int: ID of view to adjust the scale in Y

scaleY float: the scale in Y

setStringValue

public void setStringValue (int viewId, 
                String attributeName, 
                String value)

Parameters
viewId int

attributeName String

value String

setTransformPivot

public void setTransformPivot (int viewId, 
                float transformPivotX, 
                float transformPivotY)

Set X,Y location of the pivot point around which the view will rotate and scale. use Float.NaN to clear the pivot value. Note: once an actual View has had its pivot set it cannot be cleared.

Parameters
viewId int: ID of view to adjust the transforms pivot point

transformPivotX float: X location of the pivot point.

transformPivotY float: Y location of the pivot point.

setTransformPivotX

public void setTransformPivotX (int viewId, 
                float transformPivotX)

Set X location of the pivot point around which the view will rotate and scale. use Float.NaN to clear the pivot value. Note: once an actual View has had its pivot set it cannot be cleared.

Parameters
viewId int: ID of view to adjust the transforms pivot point about X

transformPivotX float: X location of the pivot point.

setTransformPivotY

public void setTransformPivotY (int viewId, 
                float transformPivotY)

Set Y location of the pivot point around which the view will rotate and scale. use Float.NaN to clear the pivot value. Note: once an actual View has had its pivot set it cannot be cleared.

Parameters
viewId int: ID of view to adjust the transforms pivot point about Y

transformPivotY float: Y location of the pivot point.

setTranslation

public void setTranslation (int viewId, 
                float translationX, 
                float translationY)

Adjust the post-layout translation of a view.

Parameters
viewId int: ID of view to adjust its translation in X & Y

translationX float: the translation in X

translationY float: the translation in Y

setTranslationX

public void setTranslationX (int viewId, 
                float translationX)

Adjust the post-layout X translation of a view.

Parameters
viewId int: ID of view to translate in X

translationX float: the translation in X

setTranslationY

public void setTranslationY (int viewId, 
                float translationY)

Adjust the post-layout Y translation of a view.

Parameters
viewId int: ID of view to to translate in Y

translationY float: the translation in Y

setTranslationZ

public void setTranslationZ (int viewId, 
                float translationZ)

Adjust the translation in Z of a view.

Parameters
viewId int: ID of view to adjust

translationZ float: the translationZ

setVerticalBias

public void setVerticalBias (int viewId, 
                float bias)

Adjust the vertical bias of the view (used with views constrained on left and right).

Parameters
viewId int: ID of view to adjust the vertical

bias float: the new bias 0.5 is in the middle

setVerticalChainStyle

public void setVerticalChainStyle (int viewId, 
                int chainStyle)

How the elements of the vertical chain will be positioned. in a chain, if the dimension behaviour is set to MATCH_CONSTRAINT

  • -- 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

Parameters
viewId int: ID of view to adjust its VerticalChainStyle

chainStyle int: the weight that we can use to distribute the horizontal space

setVerticalWeight

public void setVerticalWeight (int viewId, 
                float weight)

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

Parameters
viewId int: ID of view to adjust its VerticalWeight

weight float: the weight that we can use to distribute the vertical space

setVisibility

public void setVisibility (int viewId, 
                int visibility)

Adjust the visibility of a view.

Parameters
viewId int: ID of view to adjust the vertical

visibility int: the visibility