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I would like to constrain a View's left and right sides to it's parent view's margins and make it fill the allotted space. However, setting width to either match_parent or wrap_content appears to produce the same result.
Is there something equivalent to match_constraints (as opposed to match_parent and wrap_content)? Do match_parent and wrap_content affect the layout or are they ignored in the new constraint layout?
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If you have a complex view that has nested ViewGroup s, start using ConstraintLayout . Show activity on this post. You can continue to use other layouts for simple things (if they are not deprecated), but ConstraintLayout is faster, smarter and yes, have better performance than RelativeLayout.
ConstraintLayout has flat view hierarchy unlike other layouts, so does a better performance than relative layout. Yes, this is the biggest advantage of Constraint Layout, the only single layout can handle your UI. Where in the Relative layout you needed multiple nested layouts (LinearLayout + RelativeLayout).
To define a Barrier , you can select one or more View components from the “Design” view, open the “Guidelines” menu and select the Barrier . If you want to add it directly in the XML, you can use the following code snippet: The resulting layout looks like the screenshot of the “Design” layout editor view from below.
You can create linear layouts now with ConstraintLayout by constraining the sides of each element with each other. The quick way of creating these layouts is to select all the views together and right click to center horizontally or vertically.
match_parent is not allowed. But you can actually set width and height to 0dp and set either top and bottom or left and right constraints to "parent".
So for example if you want to have the match_parent constraint on the width of the element, you can do it like this:
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
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