{"id":29100,"date":"2023-09-18T11:37:13","date_gmt":"2023-09-18T06:07:13","guid":{"rendered":"https:\/\/mobisoftinfotech.com\/resources\/?p=29100"},"modified":"2026-03-11T18:30:16","modified_gmt":"2026-03-11T13:00:16","slug":"how-to-create-packages-for-flutter-a-developers-guide","status":"publish","type":"post","link":"https:\/\/mobisoftinfotech.com\/resources\/blog\/how-to-create-packages-for-flutter-a-developers-guide","title":{"rendered":"How to Create Packages for Flutter: A Developer\u2019s Guide"},"content":{"rendered":"

Flutter packages are a powerful way to share and reuse code in your Flutter projects. Whether you want to contribute to the Flutter community or streamline your Flutter app development<\/a> process, creating Flutter packages is the key. <\/p>\n\n\n\n

In this post, I will take you through the process of creating Flutter packages, from setting up your development environment to publishing your package on Dart’s package repository, pub.dev. Whether you’re a seasoned Flutter developer<\/a> looking to share your expertise or a newcomer eager to contribute to the Flutter community, this post will walk you through the steps to package your Flutter code effectively.<\/p>\n\n\n\n

About Flutter Package<\/h2>\n\n\n\n

A Flutter application development services<\/a> package is a broader term that refers to any self-contained piece of code that can be imported and used in a Flutter project. Packages can contain widgets, utility functions, plugins, or any other code that can be reused across multiple Flutter projects. <\/p>\n\n\n\n

<\/p>

Advantages of creating packages:<\/strong><\/h2>\n\n\n\n

Flutter packages are a cornerstone of the Flutter framework, offering developers a wide array of benefits that significantly streamline development and boost productivity. <\/p>\n\n\n\n

Reusability:<\/strong> By creating packages, you enable the reuse of code across multiple projects. This is particularly useful for sharing common functionalities or maintaining a consistent design language across different apps. This helps save time because you don’t have to recreate the same things over and over.<\/p>\n\n\n\n

Decoupling:<\/strong> Packages can be developed in a way that they are decoupled from the specific app’s context. This makes it easier to replace or update individual components without affecting the entire application.<\/p>\n\n\n\n

Code Sharing:<\/strong> Developers within your organization can easily share packages among different projects, leading to faster development cycles and reduced duplication of effort.<\/p>\n\n\n\n

Focused Development:<\/strong> Package development allows teams to focus on specific modules without being overwhelmed by the entire application’s codebase.<\/p>\n\n\n\n

Versioning and Updates:<\/strong> Packages can have their own versioning and update cycles, which can be beneficial when different parts of the application evolve at different rates.<\/p>\n\n\n\n

Maintenance:<\/strong> If a module requires updates or fixes, you can address them within the context of the package without affecting the rest of the application.<\/p>\n\n\n\n

Now, let\u2019s get started with a step-by-step practical guide on how to create packages for Flutter. <\/p>\n\n\n\n

Step 1: Create a Flutter Package<\/h2>\n\n\n\n

To create a package used in flutter app development services, open your command line interface or directory where you want to create the Flutter package and run the command mentioned below:<\/p>\n\n\n

flutter create --template=package mi_flutter_package<\/code><\/span><\/pre>\n\n\n
Replace mi_flutter_package<\/code> with the desired name for your package.<\/p>\n\n\n\n
This command will create a Flutter package project with the mi_flutter_package folder below the mentioned folder structure.<\/p>\n\n\n
package_name\/\n\u251c\u2500\u2500 lib\/\n\u2502   \u2514\u2500\u2500 mi_flutter_package.dart\n\u251c\u2500\u2500 pubspec.yaml\n\u251c\u2500\u2500 README.md\n\u2514\u2500\u2500 example\/\n    \u251c\u2500\u2500 lib\/\n    \u2514\u2500\u2500 \u2026\n<\/code><\/span><\/pre>\n\n\n
LICENSE<\/strong><\/p>\n\n\n\n
This file is mostly blank and is meant for adding legal terms regarding package usage.<\/p>\n\n\n\n
test\/<\/strong>mi_flutter_package<\/strong>_test.dart<\/strong><\/p>\n\n\n\n
The unit tests<\/a> for the package.<\/p>\n\n\n\n
mi_flutter_package.iml<\/strong><\/p>\n\n\n\n
A configuration file used by the IntelliJ IDEs.<\/p>\n\n\n\n
.gitignore<\/strong><\/p>\n\n\n\n
 A hidden file that tells Git what files or folders it should ignore when tracking changes in a project.<\/p>\n\n\n\n
.metadata<\/strong><\/p>\n\n\n\n
A hidden file is used by IDEs to track the properties of the Flutter project.<\/p>\n\n\n\n
Pubspec.yaml<\/strong><\/p>\n\n\n\n
A YAML file containing metadata that specifies the package\u2019s dependencies. Used by the pub tool.<\/p>\n\n\n\n
README.md<\/strong><\/p>\n\n\n\n
A markdown file that briefly describes the package\u2019s purpose and its usage.<\/p>\n\n\n\n
Step 2: Implementing Your Package<\/h2>\n\n\n\n
We need to write the code for our package inside the lib folder. This is where you’ll define your package’s classes, functions, widgets, or other functionality.<\/p>\n\n\n\n
In our package, we will add a class to define a flexible custom app bar widget named MIAppBarWidget for Flutter applications. Developers can use this widget and customize various aspects of the app bar’s appearance and behavior by providing values through the constructor parameters. This allows for greater flexibility in designing the app’s user interface.<\/p>\n\n\n
import 'package:flutter\/material.dart'<\/span>;\nimport 'package:flutter\/services.dart'<\/span>;\n\n\nclass<\/span> MIAppBarWidget<\/span> extends<\/span> StatelessWidget<\/span> implements<\/span> PreferredSizeWidget<\/span> <\/span>{\n final<\/span> Widget? leading;\n final<\/span> double? leadingWidth;\n final<\/span> bool automaticallyImplyLeading;\n final<\/span> Widget title;\n final<\/span> Function<\/span>(BuildContext context)<\/span> onBackButtonTapped<\/span><\/span>;\n final<\/span> TextStyle? titleTextStyle;\n final<\/span> List<\/span><Widget>? actions;\n final<\/span> bool centerTitle;\n final<\/span> double toolbarHeight;\n final<\/span> double toolbarOpacity;\n final<\/span> ShapeBorder? shapeBorder;\n final<\/span> double? elevation;\n final<\/span> Color? backgroundColor;\n final<\/span> IconThemeData? actionsIconTheme;\n final<\/span> Color? shadowColor;\n final<\/span> double sideMargin;\n final<\/span> Color? statusBarColor;\n final<\/span> Gradient? gradient;\n final<\/span> BorderRadiusGeometry? gradientRadius;\n\n\n const<\/span> MIAppBarWidget(\n     {Key? key,\n     this.leading,\n     this.automaticallyImplyLeading = false<\/span>,\n     required this.onBackButtonTapped,\n     required this.title,\n     this.titleTextStyle,\n     this.actions,\n     this.centerTitle = false<\/span>,\n     this.toolbarHeight = 60<\/span>,\n     this.toolbarOpacity = 1<\/span>,\n     this.shapeBorder,\n     this.elevation = 8<\/span>,\n     this.backgroundColor,\n     this.leadingWidth = 56<\/span>,\n     this.actionsIconTheme =\n         const<\/span> IconThemeData(color: Colors.black, size: 36<\/span>),\n     this.shadowColor,\n     this.sideMargin = 0<\/span>,\n     this.gradient,\n     this.gradientRadius,\n     this.statusBarColor})\n     : super(key: key);\n\n\n @override\n Widget build(BuildContext context) {\n   return<\/span> Container(\n     margin: EdgeInsets.only(left: sideMargin, right: sideMargin),\n     child: Center(\n       child: AppBar(\n           leading: InkWell(\n             onTap: () => {onBackButtonTapped(context)},\n             child: leading,\n           ),\n           flexibleSpace: Container(\n               decoration: BoxDecoration(\n                   gradient: gradient, borderRadius: gradientRadius)),\n           leadingWidth: leadingWidth,\n           iconTheme: actionsIconTheme,\n           automaticallyImplyLeading: automaticallyImplyLeading,\n           title: title,\n           titleTextStyle: titleTextStyle,\n           centerTitle: centerTitle,\n           actions: actions,\n           actionsIconTheme: actionsIconTheme,\n           elevation: elevation,\n           toolbarHeight: toolbarHeight,\n           toolbarOpacity: toolbarOpacity,\n           backgroundColor: backgroundColor,\n           shadowColor: shadowColor,\n           systemOverlayStyle: SystemUiOverlayStyle(\n             statusBarColor: statusBarColor, \/\/ Status bar only for android.<\/span>\n           ),\n           shape: shapeBorder),\n     ),\n   );\n }\n\n\n @override\n Size get preferredSize => Size.fromHeight(toolbarHeight);\n}\n<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Make sure you add the export ‘mi_app_bar_widget.dart’;<\/b> line in your mi_flutter_package.dart file. By doing this you will make the contents of the specified file (mi_app_bar_widget.dart in this case) available for use in other parts of your application.<\/p>\n\n\n
export<\/span> 'mi_app_bar_widget.dart'<\/span>;<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
Important:<\/b> When developing custom widgets within your package, ensure that you export these files. This action enables other applications utilizing your package to access and use these custom widgets.<\/span><\/p>\n\n\n\n