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We have the dependencies in a file named pubspec.yaml, following the yaml syntax. It is the equivalent of a gradle file.
Flutter works best with packages, and the community can contribute easily by creating those packages, and publishing them.
A package is a dependency that we include in our pubspec.yaml, in a line under the section dependencies:
dependencies:
rxdart: ^0.22.6
If it is a dev dependency (generally for code generation), it is placed under the section dev_dependencies:
dev_dependencies:
# For JSON
build_runner: ^1.0.0
json_serializable: ^2.0.0
We can find all the available packages at this URL https://pub.dev/flutter. Don’t forget to check whether a package is available for the platform you are building for: it is indicated. Most packages are available for Android and iOS, more and more for Web, and as of now, not many for desktop.
When a package has a set of good statistics about it, with some predefined metrics, it is featured on what is called flutter favorites, and we can find a list of all flutter favorites at this address: https://pub.dev/flutter/favorites
In order to use assets located in our source in our application, we have to declare them in a section of the pubspec.yaml file. For example, if we want to add 2 images called img1.png and img2.png, and access all videos in the folder videos, we would create a folder called images in the project root, then add the following lines in the yaml file:
assets:
- images/img1.png
- images/img2.png
- videos/
For fonts font1.ttf and font1-bold.ttf, we would create the folders assets/fonts at the project root, then add the following lines in the yaml file:
fonts:
- family: Bold
fonts:
- asset: assets/fonts/font1-bold.ttf
- family: Regular
fonts:
- asset: assets/fonts/font1.ttf
All source code in dart is located under the directory libs, and can be sorted under subfolders too.
It is possible to use platform-specific code, see the official documentation for more on this.