Set width to match constraints in ConstraintLayout

Question

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   Loving this new layout system for my favorite platform

User · Answer

Apparently match parent is     NOT OK for views directly under ConstraintLayout OK for views nested inside of views that are directly under ConstraintLayout   So if you need your views to function as match parent  then    Direct children of ConstraintLayout should use 0dp Nested elements  eg  grandchild to ConstraintLayout  can use match parent   Example    lt android support constraint ConstraintLayout     android layout width  match parent      android layout height  wrap content      android paddingBottom  16dp  gt        lt android support design widget TextInputLayout         android id    id phoneNumberInputLayout          android layout width  0dp          android layout height  wrap content          app layout constraintLeft toLeftOf  parent          app layout constraintRight toRightOf  parent  gt            lt android support design widget TextInputEditText             android id    id phoneNumber              android layout width  match parent              android layout height  wrap content   gt        lt  android support design widget TextInputLayout gt

User · Answer

From the official doc      Important  MATCH PARENT is not recommended for widgets contained in a   ConstraintLayout  Similar behavior can be defined by using   MATCH CONSTRAINT with the corresponding left right or top bottom   constraints being set to  parent     So if you want achieve MATCH PARENT effect  you can do this    lt TextView     android id    id textView      android layout width  0dp      android layout height  wrap content      android gravity  center      android text  TextView      app layout constraintEnd toEndOf  parent      app layout constraintStart toStartOf  parent    gt

User · Answer

I found one more answer when there is a constraint layout inside the scroll view then we need to put   android fillViewport  true    to the scroll view  and   android layout height  0dp    in the constraint layout  Example    lt  xml version  1 0  encoding  utf-8   gt   lt ScrollView xmlns android  http   schemas android com apk res android          xmlns app  http   schemas android com apk res-auto          android layout width  match parent          android layout height  match parent          android fillViewport  true  gt        lt androidx constraintlayout widget ConstraintLayout             android layout width  match parent              android layout height  0dp  gt      Rest of the views   lt  androidx constraintlayout widget ConstraintLayout gt    lt  ScrollView gt

User · Answer

set  width or height what ever u need to match parent   to 0dp  and  set margins of left   right  top  bottom to act as match parent

User · Answer

in the office doc  https   developer android com reference android support constraint ConstraintLayout  When a dimension is set to MATCH CONSTRAINT  the default behavior is to have the resulting size take all the available space    Using 0dp  which is the equivalent of  MATCH CONSTRAINT   Important  MATCH PARENT is not recommended for widgets contained in a ConstraintLayout  Similar behavior can be defined by using MATCH CONSTRAINT with the corresponding left right or top bottom constraints being set to  parent

User · Answer

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    lt TextView     android layout width  0dp      android layout height  wrap content      app layout constraintStart toStartOf  parent      app layout constraintEnd toEndOf  parent   gt

User · Answer

You can check your Adapter       1 - MyLayoutBinding binding   MyLayoutBinding inflate layoutInflater    2 - MyLayoutBinding binding   MyLayoutBinding inflate layoutInflater  viewGroup  false     I had a same problem like you when I used 1  You can try 2

User · Answer

For making your view as match parent is not possible directly  but we can do it in a little different way  but don t forget to use Left and Right attribute with Start and End  coz if you use RTL support  it will be needed        lt Button android layout width  0dp  android layout height  wrap content  app layout constraintLeft toLeftOf  parent  app layout constraintRight toRightOf  parent  app layout constraintStart toStartOf  parent  app layout constraintEnd toEndOf  parent   gt

User · Answer

match parent is not supported by ConstraintLayout  Set width to 0dp to let it match constraints

User · Answer

If you want TextView in the center of parent   Your main layout is Constraint Layout   lt androidx appcompat widget AppCompatTextView      android layout width  0dp       android layout height  wrap content       android text   string logout       app layout constraintLeft toLeftOf  parent       app layout constraintRight toRightOf  parent       android gravity  center  gt   lt  androidx appcompat widget AppCompatTextView gt

User · Answer

match parent is not supported  so use android layout width  quot 0dp quot    With 0dp  you can think of your constraints as  scalable  rather than  filling whats left   Also  0dp can be defined by a position  where match parent relies on it s parent for it s position  x y and width  height

[android] Set width to match constraints in ConstraintLayout

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