GestureDetector(
    behavior: HitTestBehavior.translucent,
    onTap: () {
        // 触摸收起键盘
        FocusScope.of(context).requestFocus(FocusNode());
    },
    child: ****视图内容***
}

把GestureDetector放在body最外层

原文链接 https://blog.csdn.net/weixin_42869574/article/details/103301302