如何在flutter的步骤方法中上传图像

Question

     List<Step> steps = [    
      Step(
      isActive: false,
      state: StepState.editing,
      title: const Text('Id Proof'),
      content: Column(
        children: <Widget>[
         OutlineButton(
         onPressed: chooseImage,
         child: Text('Choose Image'),),
         showImage(),            
         OutlineButton(
         onPressed: startUpload,
         child:Text(Upload Image),
         ),
      Text(status,textAlign:TextAlign.center,style:TextStyle(color:Colors.green))
        ],
      ),
    ),  
  ];

无法初始化chooseImage，showImage，startUpload。我试图从上述步骤开始。显示错误

只能在初始化程序中访问静态成员

Answer 1

chooseImage和startUpload不是函数，如果您创建了函数

void chooseImage() {
 // add image picking code here
}

然后您需要更改

onPressed: chooseImage,

到

onPressed: chooseImage(),

如果您没有执行这些功能，也可以做

onPressed: () {
// add image picking code here
}