解决办法:
给FloatingActionButton 加heroTag标签
错误信息有关
I/flutter (14406): When the exception was thrown, this was the stack:
I/flutter (14406): #0 Hero._allHeroesFor.inviteHero.<anonymous closure> (package:flutter/src/widgets/heroes.dart:268:11)
I/flutter (14406): #1 Hero._allHeroesFor.inviteHero (package:flutter/src/widgets/heroes.dart:279:8)
I/flutter (14406): #2 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:298:21)
I/flutter (14406): #3 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #4 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #5 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #6 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #7 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5973:16)
I/flutter (14406): #8 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #9 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #10 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #11 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #12 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #13 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #14 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #15 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #16 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #17 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5973:16)
I/flutter (14406): #18 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #19 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #20 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #21 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #22 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #23 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #24 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #25 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5973:16)
I/flutter (14406): #26 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #27 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #28 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #29 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #30 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #31 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #32 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #33 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #34 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #35 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #36 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #37 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #38 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #39 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #40 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #41 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #42 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #43 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #44 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #45 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #46 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #47 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #48 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #49 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #50 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #51 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #52 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #53 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4600:14)
I/flutter (14406): #54 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:311:15)
I/flutter (14406): #55 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5861:14)
I/flutter (14406): #56 Element.visitChildElements (package:flutter/src/widgets/framework.dart:3174:5)
I/flutter (14406): #57 Hero._allHeroesFor (package:flutter/src/widgets/heroes.dart:314:13)
I/flutter (14406): #58 HeroController._startHeroTransition (package:flutter/src/widgets/heroes.dart:841:51)
I/flutter (14406): #59 HeroController._maybeStartHeroTransition.<anonymous closure> (package:flutter/src/widgets/heroes.dart:815:11)
I/flutter (14406): #60 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1117:15)
I/flutter (14406): #61 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1064:9)
I/flutter (14406): #62 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:972:5)
I/flutter (14406): #66 _invoke (dart:ui/hooks.dart:253:10)
I/flutter (14406): #67 _drawFrame (dart:ui/hooks.dart:211:3)
I/flutter (14406): (elided 3 frames from dart:async)
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