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Flutter 报错如图：There should be exactly one item with [DropdownButton]'s value: 0. Either zero or 2 or more [DropdownMenuItem]s were detected with the same value'package:flutter/src/material/dropdown.dart':Failed assertion: line 834 pos 15: 'items == null

问题一：TextField的hintText不显示，光标不显示原因：TextField的suffixIcon图标不能用Container()占位问题二：使用TextField键盘弹起会顶起页面的内容原因：在页面开始Scaffold里面加：resizeToAvoidBottomInset: false问题三：使用GestureDetector的点击范围很小原因：在GestureDetector里面加：behavior: HitTestBehavior.opaque问题四：使用r_calen