I have one application of tabbars. one tab have textfield. It shows keyboard. I want to hide keyboard after press ob any other tab. I used below code but its still not working on other tabs.

```
return new Scaffold(
      key: _scaffoldKey,
      resizeToAvoidBottomInset: false,
        backgroundColor: blackColor,
        body: GestureDetector(
            behavior: HitTestBehavior.translucent,
            onTap: () {
              FocusScope.of(context).requestFocus(new FocusNode());
            },
            child: Stack(children: <Widget>[
              _showForm(),
            ],)
        ),
        );

```