错误信息如下：
Typically, this is done by calling "WidgetsFlutterBinding.ensureInitialized()" or "runApp()" (the latter calls the former). Typically this call is done in the "void main()" method. The "ensureInitialized" method is idempotent; calling it multiple times is not harmful.
需要在调用之前初始化
WidgetsFlutterBinding.ensureInitialized()
