Dimension Constraints

layout_constraintWidth and layout_constraintHeight

Those new attributes can be used as a replacement of android:layout_width and android:layout_height as well as several other ConstraintLayout attributes.

The different possibilities are:

• dimension (e.g. 123dp)
• match_parent
• wrap_content
• match_constraint (equivalent to 0dp with android:layout_width/height)
• wrap_content_constrained (equivalent to wrap_content + constrainedWidth/Height=true with android:layout_width/height)
• ratio=w:h or float
• weight=float
• parent=float (percent of parent)