I originally wrote this answer when I was learning how to add images to my Flutter project. Check out the documentation, but in case you need a little more step-by-step help, keep reading.
1. Create an assets/images folder
assets/images folder
This should be located in the root of your project, in the same folder as your pubspec.yaml file.
In Android Studio you can right click in the Project view
You don’t have to call it assets or images. You don't even need to make images a subfolder. Whatever name you use, though, is what you will register in the pubspec.yaml file.
2. Add your image to the new folder
You can just copy your image into assets/images. The relative path of lake.jpg, for example, would be assets/images/lake.jpg.
3. Register the assets folder in pubspec.yaml
Open the pubspec.yaml file that is in the root of your project.
