constraint barrier example

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Elisa
20 Jan 2020
1Let's have two buttons, @id/button1 and @id/button2. 
2The constraint_referenced_ids field will reference them 
3by simply having them as comma-separated list:
4     
5<androidx.constraintlayout.widget.Barrier
6     android:id="@+id/barrier"
7     android:layout_width="wrap_content"
8     android:layout_height="wrap_content"
9     app:barrierDirection="bottom"
10     app:constraint_referenced_ids="button1,button2" />
11     
12This way the barrier will allways be under button1 and button2.
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