如何为Flutter应用创建纯Dart程序包？

Question

I am trying to create a pure Dart package to be used in my Flutter app. Problem is that when building my app some Android and iOS specific files are generated under the library folder. I wonder if this is a bug or a known feature?

I have created the project using the command:

flutter create -t package mypackage

For example the generated file GeneratedPluginRegistrant.java looks like this:

package io.flutter.plugins;

import io.flutter.plugin.common.PluginRegistry;

/**
 * Generated file. Do not edit.
 */
public final class GeneratedPluginRegistrant {
  public static void registerWith(PluginRegistry registry) {
    if (alreadyRegisteredWith(registry)) {
      return;
    }
  }

  private static boolean alreadyRegisteredWith(PluginRegistry registry) {
    final String key = GeneratedPluginRegistrant.class.getCanonicalName();
    if (registry.hasPlugin(key)) {
      return true;
    }
    registry.registrarFor(key);
    return false;
  }
}

Can I avoid generating those GeneratedPluginRegistrant.* files? If not, do I have to commit them to source control?

Answer 1

For pure dart packages, you need only one thing: a pubspec.yaml , with a name & environment constraints:

name: my_package
environment:
  sdk: ">=2.0.0 <3.0.0"

This is enough to add my_package as a dependency to your flutter project though:

dependencies:
  my_package:
    path: ../path/to/my_package/folder

Answer 2

You can do it with command line:

1. path to pub should be set in your environment variable like:

   C:\\Users\\UserName\\AppData\\Roaming\\Pub\\Cache\\bin;

2. pub global activate stagehand

3. mkdir dart_project

4. cd dart_project

5. stagehand package-simple

Generating it with command line will generate a bit of code for you which will give you an idea that how a package should be managed.

You can use this project as dependency in pubspec.yaml file of your Flutter or Angular-Dart project as:

dependencies:
  dart_project:
    path: ../path/to/dart_project