解决each Hero must have a unique non-null tag.

完整错误如：

Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.

1	Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.

或者

I/flutter (8790): Another exception was thrown: There are multiple heroes that share the same tag within a subtree.

1	I/flutter (8790): Another exception was thrown: There are multiple heroes that share the same tag within a subtree.

一开始以为是Hero交互ID没绑定，检查已经绑定了。

这是因为我在一个屏幕上有两个 FloatingAction 按钮，我必须为每个 FloatingActionButton 添加一个 heroTag 属性 + 值才能消除错误。

类似

new FloatingActionButton(
    heroTag: "btn1",
    ...
)

new FloatingActionButton(
    heroTag: "btn2",
    ...
)

new FloatingActionButton(

heroTag: "btn1",

...

)

new FloatingActionButton(

heroTag: "btn2",

...

)

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