在Flutter中将GestureDector添加到Listview.builder卡的正确方法？

Question

我有一个Expanded小部件包裹在Listview.builder的Card.如何让我的卡不仅可以检测Listview.builder,还可以将变量传递给我在导航上的新.dart文件.我目前正在收到尺寸错误？

*更新代码*

这是我的代码......

new Expanded(
                child: new ListView.builder(
                    itemCount: id == null ? 0 : id.length,
                    itemBuilder: (BuildContext context, int index) {
                      return new Card(
                        child: new Column(
                          children: <Widget>[
                            new Image.network(video[index]),
                            new Padding(padding: new EdgeInsets.all(3.0)),
                            new Text(title[index],
                            style: new TextStyle(fontWeight: FontWeight.bold,
                            color: Colors.black),
                            ),
                            new GestureDetector(onTap: (){
                              print(id[index]);
                            },)

                          ],
                        ),
                      );

                    }))

这是抛出的异常......

The following assertion was thrown during performLayout():
RenderPointerListener object was given an infinite size during layout.
This probably means that it is a render object that tries to be as big as possible, but it was put
inside another render object that allows its children to pick their own size.

我想传递onTap和'视频[索引]'类似于.dartSWIFT

Answer 1

您正在添加GestureDetector作为其中的一个子项Column,而Flutter不了解这GestureDetector需要检测不同触摸事件的UI部分(您没有指定您需要GestureDetector执行其任务的确切位置)

如果你需要整个Card交互式,你需要将你Card的GestureDecetor内容包装成如下

var id = ["title 1", "title 2", "title 3", "title 4", "title 5",];

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new ListView.builder(
          itemCount: id == null ? 0 : id.length,
          itemBuilder: (BuildContext context, int index) {
            return new GestureDetector( //You need to make my child interactive
              onTap: () => print(id[index]),
              child: new Card( //I am the clickable child
                child: new Column(
                  children: <Widget>[
                    //new Image.network(video[index]),
                    new Padding(padding: new EdgeInsets.all(3.0)),
                    new Text(id[index],
                      style: new TextStyle(fontWeight: FontWeight.bold,
                          color: Colors.black),
                    ),


                  ],
                ),),
            );
          }),
    );
  }

Answer 2

与aziza的建议类似，您可以看看InkWell，它基本上是一个GestureDetector，但具有材料设计上的优势。

您还询问了如何将变量传递给另一个类。您可以通过在实例化中将它们作为构造函数变量移交来实现。看一下代码示例中的onTap方法。

代码如下所示：

@override
Widget build(BuildContext context) {
  return new Scaffold(
    body: new ListView.builder(
      itemCount: id == null ? 0 : id.length,
      itemBuilder: (BuildContext context, int index) {
        return new InkWell(
          onTap: () {
            Navigator.push(
              context,
              new MaterialPageRoute(
                builder: (context) {
                  return new OtherClass(id[index], video[index]);
                },
              ),
            );
          },
          child: new Card(
            child: new Column(
              children: <Widget>[
                //new Image.network(video[index]),
                new Padding(padding: new EdgeInsets.all(3.0)),
                new Text(id[index],
                  style: new TextStyle(fontWeight: FontWeight.bold,
                      color: Colors.black
                  ),
                ),
              ],
            ),
          ),
        );
      }),
  );
}

*代码未经测试