Flutter: How to fix “A RenderFlex overflowed by pixels ” error?

问题

I am using GridView in my Flutter app to display images and their titles. Please check the below code.

import 'package:flutter/material.dart';

import '../common_ui/search_bar.dart';

class PurchaseProductsPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return PurchaseProductsUI();
  }
}

class PurchaseProductsUI extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return _PurchaseProductUIState();
  }
}

class _PurchaseProductUIState extends State<PurchaseProductsUI> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView(
      children: <Widget>[
        Container(
          margin: EdgeInsets.all(20),
          child: SearchBar(),
        ),
        Container(
            margin: EdgeInsets.all(20),
            child: GridView.builder(
                physics: ScrollPhysics(), // to disable GridView's scrolling
                shrinkWrap: true,
                itemCount: 20,
                gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
                    crossAxisCount: 2),
                itemBuilder: (BuildContext context, int index) {
                  return Container(
                      padding: EdgeInsets.all(5), child: _buildImageBoxes());
                })),
      ],
    );
  }

  Widget _buildImageBoxes() {
    return 
   Column(
      children: <Widget>[
        Container(
          child: Image.network("https://picsum.photos/200/300/?random"),
        ),
        Container(
          padding: EdgeInsets.all(10),
          child:  Text("Text"),        )
      ],
    );

  }
}

I get the following error and UI when I run the above code

I/flutter ( 2743): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 2743): The following message was thrown during layout:
I/flutter ( 2743): A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): The overflowing RenderFlex has an orientation of Axis.vertical.
I/flutter ( 2743): The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
I/flutter ( 2743): black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
I/flutter ( 2743): Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
I/flutter ( 2743): RenderFlex to fit within the available space instead of being sized to their natural size.
I/flutter ( 2743): This is considered an error condition because it indicates that there is content that cannot be
I/flutter ( 2743): seen. If the content is legitimately bigger than the available space, consider clipping it with a
I/flutter ( 2743): ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
I/flutter ( 2743): like a ListView.
I/flutter ( 2743): The specific RenderFlex in question is:
I/flutter ( 2743):   RenderFlex#4a1bb OVERFLOWING
I/flutter ( 2743):   creator: Column ← Padding ← Container ← RepaintBoundary-[<14>] ← IndexedSemantics ←
I/flutter ( 2743):   NotificationListener<KeepAliveNotification> ← KeepAlive ← AutomaticKeepAlive ← SliverGrid ←
I/flutter ( 2743):   MediaQuery ← SliverPadding ← ShrinkWrappingViewport ← ⋯
I/flutter ( 2743):   parentData: offset=Offset(5.0, 5.0) (can use size)
I/flutter ( 2743):   constraints: BoxConstraints(w=150.0, h=150.0)
I/flutter ( 2743):   size: Size(150.0, 150.0)
I/flutter ( 2743):   direction: vertical
I/flutter ( 2743):   mainAxisAlignment: start
I/flutter ( 2743):   mainAxisSize: max
I/flutter ( 2743):   crossAxisAlignment: center
I/flutter ( 2743):   verticalDirection: down
I/flutter ( 2743): ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤
I/flutter ( 2743): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
I/flutter ( 2743): Another exception was thrown: A RenderFlex overflowed by 111 pixels on the bottom.
Reloaded 0 of 446 libraries in 1,179ms.

Below is the UI

How can I solve this?

回答1:

try to use Expanded instead of Container in _buildImageBoxes() function

  Widget _buildImageBoxes() {
    return Column(
      children: <Widget>[
        Expanded(
          child: Image.network("https://picsum.photos/500/500/?random"),
        ),
        Container(
          padding: EdgeInsets.all(10),
          child: Text("Text"),
        )
      ],
    );
  }

回答2:

Use fit property in your Image.network method to reduce the size of your image, since they are bigger and overflowing from your container, or you can enlarge your Containers by their height and width properties.

回答3:

Widget build(BuildContext context) {

final _screenSize = MediaQuery.of(context).size;

return Container(
  height: _screenSize.height * 0.2,

A mi me funciono usar MediaQuery.of(context)

来源：https://stackoverflow.com/questions/55261399/flutter-how-to-fix-a-renderflex-overflowed-by-pixels-error

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