Summary: Ctors | Methods | Protected Methods | Inherited Methods

Group

Kotlin |Java

public class Group
extends View

java.lang.Object
↳	View
	↳	androidx.constraintlayout.widget.Group

Added in 1.1

This class controls the visibility of a set of referenced widgets. Widgets are referenced by being added to a comma separated list of ids, e.g:

     <androidx.constraintlayout.widget.Group
              android:id="@+id/group"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:visibility="visible"
              app:constraint_referenced_ids="button4,button9" />

The visibility of the group will be applied to the referenced widgets. It's a convenient way to easily hide/show a set of widgets without having to maintain this set programmatically.

Multiple groups

Multiple groups can reference the same widgets -- in that case, the XML declaration order will define the final visibility state (the group declared last will have the last word).

Summary

Public constructors
`Group(Context context)`
`Group(Context context, AttributeSet attrs)`
`Group(Context context, AttributeSet attrs, int defStyleAttr)`

Public methods
`void`	`addView(View view)` Add a view to the helper.
`int[]`	`getReferencedIds()` Helpers typically reference a collection of ids
`void`	`loadParameters(ConstraintSet.Constraint constraint, HelperWidget child, ConstraintLayout.LayoutParams layoutParams, mapIdToWidget)`
`void`	`removeView(View view)` Remove a given view from the helper.
`void`	`resolveRtl(ConstraintWidget widget, boolean isRtl)`
`void`	`setReferencedIds(int[] ids)` Helpers typically reference a collection of ids
`void`	`updatePostConstraints(ConstraintLayout constainer)`
`void`	`updatePreLayout(ConstraintWidgetContainer container, Helper helper, map)`

Protected methods
`View[]`	`getViews(ConstraintLayout layout)`

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()`

Public constructors

Group

public Group (Context context)

Parameters
`context`	`Context`

Group

public Group (Context context, 
                AttributeSet attrs)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`

Group

public Group (Context context, 
                AttributeSet attrs, 
                int defStyleAttr)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`
`defStyleAttr`	`int`

Public methods

addView

public void addView (View view)

Add a view to the helper. The referenced view need to be a child of the helper's parent. The view also need to have its id set in order to be added.

getReferencedIds

public int[] getReferencedIds ()

Helpers typically reference a collection of ids

Returns
`int[]`	ids referenced

public void loadParameters (ConstraintSet.Constraint constraint, 
                HelperWidget child, 
                ConstraintLayout.LayoutParams layoutParams, 
                 mapIdToWidget)

Parameters
`constraint`	`ConstraintSet.Constraint`
`child`	`HelperWidget`
`layoutParams`	`ConstraintLayout.LayoutParams`
`mapIdToWidget`

removeView

public void removeView (View view)

Remove a given view from the helper.

resolveRtl

public void resolveRtl (ConstraintWidget widget, 
                boolean isRtl)

Parameters
`widget`	`ConstraintWidget`
`isRtl`	`boolean`

setReferencedIds

public void setReferencedIds (int[] ids)

Helpers typically reference a collection of ids

Parameters
`ids`	`int`

Returns
`void`	ids referenced

public void updatePostConstraints (ConstraintLayout constainer)

Parameters
`constainer`	`ConstraintLayout`

updatePreLayout

public void updatePreLayout (ConstraintWidgetContainer container, 
                Helper helper, 
                 map)

Parameters
`container`	`ConstraintWidgetContainer`
`helper`	`Helper`
`map`

Protected methods

protected View[] getViews (ConstraintLayout layout)

Parameters
`layout`	`ConstraintLayout`

Returns
`View[]`