get a gradient theme for entire flutter app - flutter

how can i get a gradient theme for entire flutter app , is there any modification in theme data , also theme chaniging is need,
using container gradient is simple for one page but needed it for many
get a simple way to make flutter app UI gradient.

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Is there a widget on flutter that can pop up above bottom navigation, with gradient background?

I inherited a project in flutter and I need to create or use a widget that will allow me to display information throughout the entire app. The graphic design that I want to follow has a background with a gradient of colors.
My question is, is there any widget that can appear just above a browser menu at the bottom of the application, that can comply with this type of design?
I have tried with snackbar but I have not found a way to put the gradient background and I tried with flushbar but when it opens (and allows the user to close it) it does not allow navigation.
I've tried "getx" but it does not go well with the rest of the app, because its an already big application with materialApp.
I'm expecting something that can act as a snackbar but have gradient background.

want to change the splash screen by app theme, not device theme

in Flutter I want to change the splash screen of the app according to the theme set by the app, but I can't find a way.
Instead of changing it according to the theme of the device itself, I would like to use the theme set by the app

Flutter inappwebview not using system theme

I'm using inappwebview to show my webpage in-app (currently using google to test), however it seems to not use my system theme. ie. when I toggle my emulator device from light to dark mode, google stays in light mode.
It's an obvious thing that the Webview part will not use your theme as it has its separate from Flutter App.
We are just showing the webpage in Webview so indirectly it is not a part of our app.
Even if you want to achieve this kind of thing, you can reload the URL when you change the theme in the app.
Edited:
I think you can do something like this when you change the theme: https://stackoverflow.com/a/70195085/1318946

Change image of AppIcon according to theme of app in Flutter

Here, I have three icon image for my app. I want to put each icon as the theme color of the app is changed.

Change Background Image in Flutter according to theme

I have different pages, and one FloatingActionBar, whensoever I am clicking on it, the theme of the application is getting changed. But I also want to change the background image of the app. How can I do that?