Group

public class Group
extends View

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:

     <android.support.constraint.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

public Group (Context context)

public Group (Context context, 
                AttributeSet attrs)

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

Public methods

public int[] getReferencedIds ()

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

public void resolveRtl (ConstraintWidget widget, 
                boolean isRtl)

public void setReferencedIds (int[] ids)

public void updatePostConstraints (ConstraintLayout constainer)

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

Protected methods

protected View[] getViews (ConstraintLayout layout)