Flutter RenderBox was not laid out

Question

I m trying to create a ListView but when I import the list form dart class i get this error  Maybe I made some mistakes with the layout because if I try to run it inside the main file I don t get this error   This is the error       I flutter  12956   --   EXCEPTION CAUGHT BY RENDERING LIBRARY   --------------------------------------------------------- I flutter  12956   The following assertion was thrown during performResize    I flutter  12956   Vertical viewport was given unbounded height  I flutter  12956   Viewports expand in the scrolling direction to fill their container In this case  a vertical I flutter  12956   viewport was given an unlimited amount of vertical space in which to expand  This situation I flutter  12956   typically happens when a scrollable widget is nested inside another scrollable widget  I flutter  12956   If this widget is always nested in a scrollable widget there is no need to use a viewport because I flutter  12956   there will always be enough vertical space for the children  In this case  consider using a Column I flutter  12956   instead  Otherwise  consider using the  shrinkWrap  property  or a ShrinkWrappingViewport  to size I flutter  12956   the height of the viewport to the sum of the heights of its children  I flutter  12956   I flutter  12956   When the exception was thrown  this was the stack  I flutter  12956    0      RenderViewport performResize  lt anonymous closure gt   package flutter src rendering viewport dart 1133 15  I flutter  12956    1      RenderViewport performResize  package flutter src rendering viewport dart 1186 6  I flutter  12956    2      RenderObject layout  package flutter src rendering object dart 1616 9  I flutter  12956    3       RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    4      RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    5       RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    6      RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    7       RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    8      RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    9       RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    10     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    11      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    12     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    13      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    14     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    15      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    16     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    17      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    18     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    19     RenderFlex performLayout  package flutter src rendering flex dart 738 15  I flutter  12956    20     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    21     RenderFlex performLayout  package flutter src rendering flex dart 738 15  I flutter  12956    22     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    23     RenderPositionedBox performLayout  package flutter src rendering shifted box dart 381 13  I flutter  12956    24     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    25     MultiChildLayoutDelegate layoutChild  package flutter src rendering custom layout dart 141 11  I flutter  12956    26      ScaffoldLayout performLayout  package flutter src material scaffold dart 339 7  I flutter  12956    27     MultiChildLayoutDelegate  callPerformLayout  package flutter src rendering custom layout dart 211 7  I flutter  12956    28     RenderCustomMultiChildLayoutBox performLayout  package flutter src rendering custom layout dart 355 14  I flutter  12956    29     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    30      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    31     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    32      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    33      RenderCustomClip performLayout  package flutter src rendering proxy box dart 1192 11  I flutter  12956    34     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    35      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    36     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    37      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    38      RenderCustomClip performLayout  package flutter src rendering proxy box dart 1192 11  I flutter  12956    39     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    40      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    41     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    42      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    43     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    44      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    45     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    46      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    47     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    48      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    49     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    50      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    51     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    52      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    53     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    54      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    55     RenderOffstage performLayout  package flutter src rendering proxy box dart 2884 13  I flutter  12956    56     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    57     RenderStack performLayout  package flutter src rendering stack dart 520 15  I flutter  12956    58     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    59       RenderTheatre amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    60     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    61      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    62     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    63      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    64     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    65      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    66     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    67      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    68     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    69      RenderProxyBox amp RenderBox amp RenderObjectWithChildMixin amp RenderProxyBoxMixin performLayout  package flutter src rendering proxy box dart 108 13  I flutter  12956    70     RenderObject layout  package flutter src rendering object dart 1631 7  I flutter  12956    71     RenderView performLayout  package flutter src rendering view dart 147 13  I flutter  12956    72     RenderObject  layoutWithoutResize  package flutter src rendering object dart 1506 7  I flutter  12956    73     PipelineOwner flushLayout  package flutter src rendering object dart 765 18  I flutter  12956    74      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding amp PaintingBinding amp SemanticsBinding amp RendererBinding drawFrame  package flutter src rendering binding dart 270 19  I flutter  12956    75      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding amp PaintingBinding amp SemanticsBinding amp RendererBinding amp WidgetsBinding drawFrame  package flutter src widgets binding dart 674 13  I flutter  12956    76      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding amp PaintingBinding amp SemanticsBinding amp RendererBinding  handlePersistentFrameCallback  package flutter src rendering binding dart 208 5  I flutter  12956    77      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding  invokeFrameCallback  package flutter src scheduler binding dart 990 15  I flutter  12956    78      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding handleDrawFrame  package flutter src scheduler binding dart 930 9  I flutter  12956    79      WidgetsFlutterBinding amp BindingBase amp GestureBinding amp ServicesBinding amp SchedulerBinding scheduleWarmUpFrame  lt anonymous closure gt   package flutter src scheduler binding dart 751 7  I flutter  12956    81      Timer  runTimers  dart isolate runtime libtimer impl dart 382 19  I flutter  12956    82      Timer  handleMessage  dart isolate runtime libtimer impl dart 416 5  I flutter  12956    83      RawReceivePortImpl  handleMessage  dart isolate runtime libisolate patch dart 171 12  I flutter  12956    elided one frame from package dart async  I flutter  12956   I flutter  12956   The following RenderObject was being processed when the exception was fired  I flutter  12956     RenderViewport 925a8 NEEDS-LAYOUT NEEDS-PAINT I flutter  12956     creator  Viewport    ScrollableScope   IgnorePointer- GlobalKey 8e8f7    Semantics   Listener   I flutter  12956      GestureSemantics   RawGestureDetector- LabeledGlobalKey lt RawGestureDetectorState gt  67ae5    I flutter  12956      ScrollSemantics- GlobalKey 17eb8    RepaintBoundary   CustomPaint   RepaintBoundary   I flutter  12956     NotificationListener lt ScrollNotification gt      I flutter  12956     parentData   lt none gt   can use size  I flutter  12956     constraints  BoxConstraints unconstrained  I flutter  12956     size  MISSING I flutter  12956     axisDirection  down I flutter  12956     crossAxisDirection  right I flutter  12956     offset  ScrollPositionWithSingleContext c4917 offset  0 0  range  null  null  viewport  null  I flutter  12956     ScrollableState  AlwaysScrollableScrollPhysics - gt  ClampingScrollPhysics  IdleScrollActivity 2fecf  I flutter  12956     ScrollDirection idle  I flutter  12956     anchor  0 0 I flutter  12956   This RenderObject had the following descendants  showing up to depth 5   I flutter  12956     RenderSliverPadding 74d62 NEEDS-LAYOUT NEEDS-PAINT I flutter  12956       RenderSliverList 5c56d NEEDS-LAYOUT NEEDS-PAINT I flutter  12956   ---------------------------------------------------------------------------------------------------- I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderViewport 925a8 NEEDS-LAYOUT NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderViewport 925a8 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderIgnorePointer 8bbda relayoutBoundary up11 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderSemanticsAnnotations 209b4 relayoutBoundary up10 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderPointerListener a9641 relayoutBoundary up9 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderSemanticsGestureHandler 9f5b4 relayoutBoundary up8 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out   RenderScrollSemantics 47944 relayoutBoundary up7 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderRepaintBoundary e17a8 relayoutBoundary up6 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderCustomPaint a2328 relayoutBoundary up5 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderRepaintBoundary 02607 relayoutBoundary up4 NEEDS-PAINT I flutter  12956   Another exception was thrown  RenderBox was not laid out  RenderFlex 79164 relayoutBoundary up3 NEEDS-PAINT I flutter  12956   Another exception was thrown   package flutter src rendering shifted box dart   Failed assertion  line 310 pos 12   child hasSize   is not true  I flutter  12956   Another exception was thrown  NoSuchMethodError  The method   lt    was called on null    This is the list form dart class   import  package flutter material dart    class ListForm extends StatefulWidget      override   ListFormState createState     gt  new ListFormState       class ListFormState extends State lt ListForm gt        List lt String gt  products     Test1    Test2    Test3         override     Widget build BuildContext context          return new Container          child  new Center            child  new Column              children   lt Widget gt                 new Row                  children   lt Widget gt                     new ListView builder                      itemCount  products length                      itemBuilder   BuildContext ctxt  int index                          return new Text products index                                                                 new IconButton                      icon  Icon Icons remove circle                       onPressed                                                                 mainAxisAlignment  MainAxisAlignment spaceBetween                                 new TextField                  decoration  new InputDecoration                    hintText   Prodotto                                     onSubmitted   String str                      setState                          products add str                                                                                                                    This is the app base dart class   import  package flutter material dart   import     UI list form dart    class AppBase extends StatefulWidget      override   State createState     gt  new AppBaseState       class AppBaseState extends State lt AppBase gt      bool  pressed   true      override   Widget build BuildContext context        return new Material        color  Colors greenAccent        child  new Scaffold          body            new ListForm            appBar  AppBar            centerTitle  true            title  const Text  Skeeper              backgroundColor  Colors green                     floatingActionButton  FloatingActionButton            tooltip   Test             child  new Icon Icons add             backgroundColor  Colors green            onPressed                     setState                       pressed     pressed                                                                   Don t worry if there is some unused code  it s a work in progress and this error just stopped me continuing what I was doing

User · Answer

Wrap your ListView in an Expanded widget   Expanded child MyListView

User · Answer

I had a simmilar problem  but in my case I was put a row in the leading of the Listview  and it was consumming all the space  of course  I just had to take the Row out of the leading  and it was solved  I would recomend to check if the problem is a widget larger than its containner can have

User · Answer

Placing your list view in a Flexible widget may also help   Flexible  fit  FlexFit tight  child   buildYourListWidget

User · Answer

Reading answers here  it seems that the error  quot RenderBox was not laid out quot  is caused when somehow the ListView size is limitless and this can happen in different scenarios  Just aiming to help who may have the same case as mine  In my case  I was getting this error because my ListView was inside a a column whose parent was a SingleChildScrollView  I remove this parent and it worked  Here is my working code   List  todoList     quot AAA quot    quot BBB quot               body  Column        children            Container               Expanded              child  ListView builder                  itemCount   todoList length                  itemBuilder   context  index                      return ListTile title  Text  todoList index                                           Here how it was when I was getting the  quot not laid out quot  error       List  todoList     quot AAA quot    quot BBB quot                     body  SingleChildScrollView child  Column        children            Container               Expanded              child  ListView builder                  itemCount   todoList length                  itemBuilder   context  index                      return ListTile title  Text  todoList index                                            I hope this may be useful for someone

User · Answer

Reason for the error   Column tries to expands in vertical axis  and so does the ListView  hence you need to constrain the height of ListView       Solutions   Use either Expanded or Flexible if you want to allow ListView to take up entire left space in Column    Column    children   lt Widget gt       Expanded        child  ListView                          Use SizedBox if you want to restrict the size of ListView to a certain height    Column    children   lt Widget gt       SizedBox        height  200     constrain height       child  ListView                       Use shrinkWrap  if your ListView isn t too big    Column    children   lt Widget gt       ListView        shrinkWrap  true     use it

User · Answer

The problem is that you are placing the ListView inside a Column Row  The text in the exception gives a good explanation of the error   To avoid the error you need to provide a size to the ListView inside   I propose you this code that uses an Expanded to inform the horizontal size  maximum available  and the SizedBox  Could be a Container  for the height       new Row        children   lt Widget gt           Expanded            child  SizedBox              height  200 0              child  new ListView builder                scrollDirection  Axis horizontal                itemCount  products length                itemBuilder   BuildContext ctxt  int index                    return new Text products index                                                                    new IconButton            icon  Icon Icons remove circle             onPressed                                   mainAxisAlignment  MainAxisAlignment spaceBetween

User · Answer

I used this code to fix the issue of displaying items in the horizontal list   new Container        height  20        child  Row          mainAxisAlignment  MainAxisAlignment end          children   lt Widget gt             ListView builder              scrollDirection  Axis horizontal              shrinkWrap  true              itemCount  array length              itemBuilder   context  index                 return array index

User · Answer

I had a similir problem  but in my case  I put a row in the leading of the ListView  and it was consuming all the space  of course  I just had to take the Row out of the leading  and it was solved  I would recommend to check if the problem is a larger widget than its container can have  Expanded child MyListView

User · Answer

You can add some code like this   ListView builder     shrinkWrap  true

[dart] Flutter: RenderBox was not laid out

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