Problems with theming scaffold in flutter

Question

I encountered 2 main problems when theming the scaffold of my app:

Look first at the app bar and you can see it's a color different from the scaffold (something like my primary color with opacity) even though I designed it to be like the scaffold. The second problem is that at the bottom of the scaffold there is a section not styled (maybe because I'm using a SafeArea idk).

Here is the Theme data I'm using:

final theme = ThemeData(

  useMaterial3: true,
  colorScheme: const ColorScheme(
    brightness: Brightness.light,
    primary: Color.fromRGBO(248, 95, 106, 1),
    onPrimary: Colors.white,
    secondary: Color.fromRGBO(167, 183, 216, 1),
    onSecondary: Colors.white,
    error: Colors.red,
    onError: Colors.white,
    background: Color.fromARGB(240, 252, 251, 244),
    onBackground: Colors.black,
    surface: Colors.black45,
    onSurface: Colors.black,
  ),
);

And here is the code of the screen:

import 'package:flutter/material.dart';
import 'package:jimprova/models/workout_model.dart';
import 'package:jimprova/widgets/training/exercise_training_card.dart';

class TrainingScreen extends StatefulWidget {
  const TrainingScreen({
    super.key,
    required this.workout,
  });

  final Workout workout;

  @override
  State<TrainingScreen> createState() => _TrainingScreenState();
}

class _TrainingScreenState extends State<TrainingScreen> {
  int indexEx = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.background,
        title: Text(
          widget.workout.title,
          style: Theme.of(context).textTheme.titleLarge!.copyWith(
                color: Theme.of(context).colorScheme.onBackground,
                fontWeight: FontWeight.bold,
              ),
        ),
      ),
      body: SafeArea(
        child: Stack(
          children: [
            SingleChildScrollView(
                    // rest of the code... (there are only rows, columns and a listview.builder)
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Dhafin Rayhan · Accepted Answer · 2023-10-18 14:40:35Z

1

This is usually related to the surfaceTintColor property, you can set it to transparent if you want:

appBarTheme: AppBarTheme(
  surfaceTintColor: Colors.transparent,
  // ...
),

answered Oct 18, 2023 at 14:40

Dhafin Rayhan

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6 Comments

Francesco Zanoncelli Over a year ago

Thanks a lot for the tip, it worked. However, if I try to scroll down, another section under the appbar is not styled too. Do you know how to solve that?

Dhafin Rayhan Over a year ago

Do you mean the status bar? Can you give a screenshot?

Dhafin Rayhan Over a year ago

You might want to try setting extendBodyBehindAppBar: true, in your Scaffold, also play around with forceMaterialTransparency: true in the AppBar

Francesco Zanoncelli Over a year ago

I added a second screenshot

Dhafin Rayhan Over a year ago

That could be a problem with the children widgets of the Stack, maybe wrap the SingleChildScrollView with Positioned.fill?

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