Flex layout issues.

flexlayout.dart

import 'package:flutter/material.dart';

void main() {
    runApp(new AnimatedListSample());
}

class AnimatedListSample extends StatelessWidget{
  final GlobalKey<AnimatedListState> _listKey =
      new GlobalKey<AnimatedListState>();
  
  // Used to build list items.
    Widget _buildItem(
        BuildContext context, int index, Animation<double> animation) {
            var clr = Colors.blue;
            if ( (index % 2) == 1 ) {
                clr = Colors.red;
            }
            return new Container(
                color: clr,
                height: 100.0
            );
        }

    @override
    Widget build(BuildContext context) {
        var list = new AnimatedList(
            key: _listKey,
            initialItemCount: 3,
            itemBuilder: _buildItem,
            padding: new EdgeInsets.all(0.0),
        );

        var widget = new MaterialApp(
                home: new Scaffold(
                    body: new Container( 
                        color: Colors.white,
                        child: new Column(
                            children: <Widget>[
                                new Container( 
                                    color: Colors.grey,
                                    child:  new Column(
                                        children: <Widget>[
                                            new Expanded( child:list),
                                            /*
                                                My other widgets
                                            */
                                        ],
                                    )
                                ),
                                /*
                                    My other widgets
                                */
                            ],
                        )
                    )
                ),
            );

            return widget;
        }
}