我创建了一个flutter应用程序，并使用图像选择器将图像作为gridView放到中心，并使用网格图块循环图像数组。是否可以在轻按gridTile时触发它？下面是main.dart中的代码，用于获取将图像添加到数组和网格视图的图像。

class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
File _imageFile;
List<File> _imageList=[];

getImage() async {
var _fileName = await ImagePicker.pickImage();
setState(() {
  _imageFile = _fileName;
  _imageList.add(_imageFile);
});
}

 removeImage(int index){
  setState((){
  _imageList.removeAt(index);
});
}
 @override
 Widget build(BuildContext context) {

 return new Scaffold(
  appBar: new AppBar(

    title: new Text(widget.title),
  ),
  body: new Center(

    child:_imageList.length == 0
        ? new Text('No image selected.')
        :new GridView.count(
        crossAxisCount: 4,
        childAspectRatio: 1.0,
        padding: const EdgeInsets.all(4.0),
        mainAxisSpacing: 4.0,
        crossAxisSpacing: 4.0,
        children: _imageList.map((File file) {
          return new GridTile(

              child: new Image.file(file, fit: BoxFit.cover,));

        }).toList()),
  ),

  floatingActionButton: new FloatingActionButton(
    onPressed:getImage,
    tooltip: 'Pick Image',
    child: new Icon(Icons.add_a_photo),
  ),
);
}
}