Error in background image from asset in SliverAppBar in flutter

Question

I am making an app in which i am using a sliver app bar. I want to change the background with image from my asset but i am getting an error that " The Constructor being called isn't a const constructor" I am new in flutter and unable to resolve this error. Please help enter image description here

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Answer 1

The problem with your code is that you are assigning a constant FlexibleSpaceBar() widget to flexibleSpace parameter which isn't supposed to be constant as SliverAppBar is a dynamic widget and it changes its size at run-time as the user scrolls it up and down so making FlexibleSpaceBar() widget const doesn't make any sense.

SO the solution is to just remove the const keyword before the FlexibleSpaceBar() constructor.