hikionori/solid_test

Test task for the position of Junior Flutter Developer

Task description

The task involves the development of a rudimentary Flutter application. The application should display the text "Hello World!" centrally on the screen. Upon interaction with the screen, the application is expected to dynamically change the background color to a color selected at random. As a developer, I am permitted to incorporate any additional functionality into the application that I deem necessary. Please note that the background color must be changed without the use of any external libraries.

App should be developed using the latest stable version of Flutter. The application code should use linting from Solid package. Code base should follow DRY and KISS principles.

Solution

1. First how to generate a random color in Flutter.

import 'dart:math';

// generate random color using Random class and HSV color model
Color randomColor() {
  return Color((Random().nextDouble() * 0xFFFFFF).toInt() << 0)
          .withOpacity(1.0);
}

But if text color is white and background color is white, the text will be invisible. So we should change color of the text if the background color is too light. We can use brightness property of the Color class to check if the color is too light or too dark. If the color is too light we should change the text color to black.

Color textColor(Color color) {
  return color.computeLuminance() > 0.5 ? Colors.black : Colors.white;
}

2. Okay now we have algorithm to generate random color. But how to change bg color of the application by tapping on the any part of the screen. Solution is very simple. We should use Stack where first child is GestureDetector with Container and second child is Text.
3. Now we have to change the color of the Container by tapping on the screen. We can use setState to change the color of the Container by tapping on the screen.

So.... But this looks so stinky. We can use AnimatedContainer to change the color of the Container with animation.

But this is very simple. And for make this task more interesting I will use Cubit from bloc for handle the locale state of the application.

Application support this locales:

• English
• Español
• Ukrainian
• French
• Italian

For add localization to the application I have to use flutter_localizations package. And follow the documentation to add localization to the application.

Screenshots

English	Español	Ukrainian	French	Italian

How to run the application

1. Clone the repository

git clone https://github.com/hikionori/solid_test.git

2. Go to the project directory

cd solid_test

3. Get the dependencies

flutter pub get

4. Run the application

flutter run