颤振错误：断言失败：第 1785 行 pos 12：'hasSize'答案

【问题标题】：Flutter error:Failed assertion: line 1785 pos 12: 'hasSize'颤振错误：断言失败：第 1785 行 pos 12：'hasSize'
【发布时间】：2021-03-04 23:01:21
【问题描述】：

我有一个在颤动中录制音频的代码。该代码应该可以完美运行而不会出现错误，每当我尝试从警报对话框中调用它时都会出现错误

在 performLayout() 期间抛出了以下断言： RenderShrinkWrappingViewport 不支持返回内在尺寸。

计算内在维度需要实例化每个视口的孩子，它击败了视口的观点懒惰。

如果您只是想在主轴上收缩视口方向，你应该能够通过给予视口松散约束，无需测量其内在维度。

我正在尝试将录制音频的选项传递给警报对话框。用户从弹出窗口而不是主屏幕录制音频。我做错了什么？

到目前为止我有什么

 Widget setupAlertDialoadContainer() {
    return ListView(
      shrinkWrap: true, //just set this property
      padding: const EdgeInsets.all(8.0),
      //children: listItems.toList(),
      children: <Widget>[
        Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
              margin: EdgeInsets.only(top: 24.0, bottom: 16.0),
              child: Text(
                this._recorderTxt,
                style: TextStyle(
                  fontSize: 48.0,
                  color: Colors.black,
                ),
              ),
            ),
            _isRecording
                ? LinearProgressIndicator(
                    value: 100.0 / 160.0 * (this._dbLevel ?? 1) / 100,
                    valueColor: AlwaysStoppedAnimation<Color>(Colors.green),
                    backgroundColor: Colors.red,
                  )
                : Container()
          ],
        ),
        Row(
          children: <Widget>[
            Container(
              width: 56.0,
              height: 56.0,
              margin: EdgeInsets.all(10.0),
              child: FloatingActionButton(
                heroTag: "Record",
                onPressed: () {
                  if (!this._isRecording) {
                    return this.startRecorder();
                  }
                  this.stopRecorder();
                },
                child: this._isRecording ? Icon(Icons.stop) : Icon(Icons.mic),
              ),
            ),
          ],
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
        ),
        Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
              margin: EdgeInsets.only(top: 60.0, bottom: 16.0),
              child: Text(
                this._playerTxt,
                style: TextStyle(
                  fontSize: 48.0,
                  color: Colors.black,
                ),
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Container(
              width: 56.0,
              height: 56.0,
              margin: EdgeInsets.all(8.0),
              child: FloatingActionButton(
                heroTag: "Start",
                onPressed: () {
                  startPlayer();
                },
                child: Icon(Icons.play_arrow),
              ),
            ),
            Container(
              width: 56.0,
              height: 56.0,
              margin: EdgeInsets.all(8.0),
              child: FloatingActionButton(
                heroTag: "Pause",
                onPressed: () {
                  pausePlayer();
                },
                child: Icon(Icons.pause),
              ),
            ),
            Container(
              width: 56.0,
              height: 56.0,
              margin: EdgeInsets.all(8.0),
              child: FloatingActionButton(
                heroTag: "Stop",
                onPressed: () {
                  stopPlayer();
                },
                child: Icon(Icons.stop),
              ),
            ),
          ],
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
        ),
        Container(
            height: 56.0,
            child: Slider(
                value: slider_current_position,
                min: 0.0,
                max: max_duration,
                onChanged: (double value) async {
                  await flutterSound.seekToPlayer(value.toInt());
                },
                divisions: max_duration.toInt()))
      ],
    );
  }

如何将数据传递到警报对话框

showDialog(
                        context: context,
                        builder: (BuildContext context) {
                          return AlertDialog(
                            title: Text('Record the data collection'),
                            content: setupAlertDialoadContainer(),
                          );
                        });

【问题讨论】：

你试过用Expanded包裹你的ListView吗？
是的，当我尝试得到错误 The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject, which has been set up to accept ParentData of incompatible type BoxParentData.
尝试用Row 或Column 包裹Expanded。
错误If you are merely trying to shrink-wrap the viewport in the main axis direction, you should be able to achieve that effect by just giving the viewport loose constraints, without needing to measure its intrinsic dimensions.
尝试使用 Container 进行包装，并为其赋予 width 属性。

标签： flutter dart

【解决方案1】：

警告框打开时是否显示错误？如果是，我的建议是使用

showDialog(
                        context: context,
                        builder: (BuildContext context) {
                          return AlertDialog(
                            title: Text('Record the data collection'),
                            content: Container(
                                       child:setupAlertDialoadContainer(),
                                       height:200,
                                       width:200,
                                      ),
                          );
                        });

根据需要改变容器的宽度和高度

【讨论】：