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hidden subfolder. The .android folder contains an
Android project that can both help you run a barebones
standalone version of your Flutter module via flutter run
and it’s also a wrapper that helps bootstrap the Flutter
module an embeddable Android library.info Note
Add custom Android code to your own existing
application’s project or a plugin,
not to the module in .android/.
Changes made in your module’s .android/
directory won’t appear in your existing Android
project using the module.Do not source control the .android/ directory
since it’s autogenerated. Before building the
module on a new machine, run flutter pub get
in the flutter_module directory first to regenerate
the .android/ directory before building the
Android project using the Flutter module.info Note
To avoid Dex merging issues, flutter.androidPackage should
not be identical to your host app’s package name.<topic_end>
<topic_start>Java version requirement
Flutter requires your project to declare compatibility with Java 11 or later.Before attempting to connect your Flutter module project
to your host Android app, ensure that your host Android
app declares the following source compatibility within your
app’s build.gradle file, under the android { } block.
<code_start>android {
//...
compileOptions {
sourceCompatibility 11 // The minimum value
targetCompatibility 11 // The minimum value
}
}<code_end>
<topic_end>
<topic_start>Centralize repository settings
Starting with Gradle 7, Android recommends using centralized repository
declarations in settings.gradle instead of project or module level
declarations in build.gradle files.Before attempting to connect your Flutter module project to your
host Android app, make the following changes.Remove the repositories block in all of your app’s build.gradle files.Add the dependencyResolutionManagement displayed in this step to the
settings.gradle file.<topic_end>
<topic_start>
Add the Flutter module as a dependency
Add the Flutter module as a dependency of your
existing app in Gradle. You can achieve this in two ways.Android archive
The AAR mechanism creates generic Android AARs as
intermediaries that packages your Flutter module.
This is good when your downstream app builders don’t
want to have the Flutter SDK installed. But,
it adds one more build step if you build frequently.Module source code
The source code subproject mechanism is a convenient
one-click build process, but requires the Flutter SDK.
This is the mechanism used by the Android Studio IDE plugin.<topic_end>
<topic_start>Depend on the Android Archive (AAR)
This option packages your Flutter library as a generic local
Maven repository composed of AARs and POMs artifacts.
This option allows your team to build the host app without
installing the Flutter SDK. You can then distribute the
artifacts from a local or remote repository.Let’s assume you built a Flutter module at
some/path/flutter_module, and then run:Then, follow the on-screen instructions to integrate.More specifically, this command creates
(by default all debug/profile/release modes)
a local repository, with the following files:To depend on the AAR, the host app must be able
to find these files.To do that, edit settings.gradle in your host app
so that it includes the local repository and the dependency:</br><topic_end>
<topic_start>
Kotlin DSL based Android Project
After an aar build of a Kotlin DSL-based Android project,
follow these steps to add the flutter_module.Include the flutter module as a dependency in
the Android project’s app/build.gradle file.
<code_start>android {
buildTypes {
release {
...
}
debug {
...
}
create("profile") {
initWith(getByName("debug"))
}
}
dependencies {
// ...
debugImplementation "com.example.flutter_module:flutter_debug:1.0"
releaseImplementation 'com.example.flutter_module:flutter_release:1.0'
add("profileImplementation", "com.example.flutter_module:flutter_profile:1.0")
}<code_end>
The profileImplementation ID is a custom configuration to be
implemented in the app/build.gradle file of a host project.
<code_start>configurations {
getByName("profileImplementation") {
}
}<code_end>
<code_start>include(":app")
dependencyResolutionManagement {
repositories {
maven(url = "https://storage.googleapis.com/download.flutter.io")
maven(url = "some/path/flutter_module_project/build/host/outputs/repo")
}
}<code_end>
error Important
If you’re located in China, use a mirror site rather than the
storage.googleapis.com domain. To learn more about mirror sites,
check out Using Flutter in China page.lightbulb Tip