问题描述

StaggeredGridView加载出一页来，下面的图片不能滑动查看到。页面不会滚动。

问题出现的环境背景及自己尝试过哪些方法

windows10下flutter 1.7，
能进入初始化print,但滑动屏幕不会进入监听事件。
controller: _scrollController,设置了，
itemCount: 10,图片加载10张

相关代码

// 请把代码文本粘贴到下方（请勿用图片代替代码）

import 'dart:math';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';

final Uint8List kTransparentImage = new Uint8List.fromList(<int>[
  0x89,
  0x50,
  0x4E,
  0x47,
  0x0D,
  0x0A,
  0x1A,
  0x0A,
  0x00,
  0x00,
  0x00,
  0x0D,
  0x49,
  0x48,
  0x44,
  0x52,
  0x00,
  0x00,
  0x00,
  0x01,
  0x00,
  0x00,
  0x00,
  0x01,
  0x08,
  0x06,
  0x00,
  0x00,
  0x00,
  0x1F,
  0x15,
  0xC4,
  0x89,
  0x00,
  0x00,
  0x00,
  0x0A,
  0x49,
  0x44,
  0x41,
  0x54,
  0x78,
  0x9C,
  0x63,
  0x00,
  0x01,
  0x00,
  0x00,
  0x05,
  0x00,
  0x01,
  0x0D,
  0x0A,
  0x2D,
  0xB4,
  0x00,
  0x00,
  0x00,
  0x00,
  0x49,
  0x45,
  0x4E,
  0x44,
  0xAE,
]);




List<IntSize> _createSizes(int count) {
  Random rnd = new Random();
  return new List.generate(count,
      (i) => new IntSize((rnd.nextInt(500) + 200), rnd.nextInt(800) + 200));
}

class Example08 extends StatefulWidget {
  @override
  Example08State createState() => new Example08State();
}

class Example08State extends State<Example08> {
  static const int _kItemCount = 10;
  final List<IntSize> _sizes = _createSizes(_kItemCount).toList();
  ScrollController _scrollController = new ScrollController();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('random dynamic tile sizes'),
      ),
      body: new StaggeredGridView.countBuilder(
        controller: _scrollController,
        itemCount: 10,
        primary: false,
        crossAxisCount: 4,
        mainAxisSpacing: 4.0,
        crossAxisSpacing: 4.0,
        itemBuilder: (context, index) => new _Tile(index, _sizes[index]),
        staggeredTileBuilder: (index) => new StaggeredTile.fit(2),
      ),
    );
  }

  @override
  void initState() {
    super.initState();
    print('初始化进入');

    _scrollController.addListener(() {
      print('我监听到了');
    });
  }

}

class IntSize {
  const IntSize(this.width, this.height);

  final int width;
  final int height;
}

class _Tile extends StatelessWidget {
  const _Tile(this.index, this.size);

  final IntSize size;
  final int index;

  @override
  Widget build(BuildContext context) {
    return new Card(
      child: new Column(
        children: <Widget>[
          new Stack(
            children: <Widget>[
              //new Center(child: new CircularProgressIndicator()),
              new Center(
                child: new FadeInImage.memoryNetwork(
                  placeholder: kTransparentImage,
                  image: 'https://picsum.photos/${size.width}/${size.height}/',
                ),
              ),
            ],
          ),
          new Padding(
            padding: const EdgeInsets.all(4.0),
            child: new Column(
              children: <Widget>[
                new Text(
                  'Image number $index',
                  style: const TextStyle(fontWeight: FontWeight.bold),
                ),
                new Text(
                  'Width: ${size.width}',
                  style: const TextStyle(color: Colors.grey),
                ),
                new Text(
                  'Height: ${size.height}',
                  style: const TextStyle(color: Colors.grey),
                ),
              ],
            ),
          )
        ],
      ),
    );
  }
}

你期待的结果是什么？实际看到的错误信息又是什么？