当在颤抖中按下按钮时，有没有一种方法可以自动填充textformfield

Question

该按钮会生成一个唯一的时间戳，我希望将其自动填充到页面内表单中的表单域中。此字段值被推送到数据库。

 new RaisedButton(
                    elevation: 5.0,
                    shape: new RoundedRectangleBorder(
                        borderRadius: new BorderRadius.circular(10.0)),
                    onPressed: () {
                      showDialog(
                        context: context,
                        barrierDismissible: false,
                        builder: (BuildContext context) {
                          return AlertDialog(
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(32.0),
                            ),
                            title: SelectableText(
                              DateTime.now().millisecondsSinceEpoch.toString(),
                              ),
                            actions: <Widget>[
                              FlatButton(
                                child: Text('Done'),
                                textColor: Theme.Colors.loginGradientStart,
                                onPressed: () {
                                  Navigator.of(context).pop();
                                },
                              )
                            ],
                          );
                        },
                      );
                    },
                    child: const Text(
                      'GENERATE\nTRACKING-No',
                      style: TextStyle(
                          fontSize: 20,
                          fontFamily: 'Spectral',
                          fontWeight: FontWeight.bold,
                          fontStyle: FontStyle.normal),
                      textAlign: TextAlign.center,
                    ),
                  ),

Answer 1

设置TextField文本。

void onButtonPressed(){
  _controller.text = /* new value*/;
}

final _controller = TextEditingController();

// ...
TextFormField(controller: _controller)
// ...

void dispose() {
  _controller.dispose();
  super.dispose();
}