Including AAR into flutter project (Android Studio)

[gingu83]

Steps to reproduce

Hi, I'm using an our external aar package connecting to an external usb device (with some C code).
This package works perfectly in a simple Android project and I added it into flutter project with success. I able to compile and create a apk package but when I try to run app on device, I can't try to connect to the device. How can I do? is there some kind of compilations for flutter project different to a simple nativa java one?
Please help me
Thank you

Expected results

Correctly connection on usb device and work

Actual results

Connection to usb device failed

Code sample

Code sample

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Screenshots or Video

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Logs

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Flutter Doctor output

Doctor output

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[huycozy]

Hi @gingu83
Could you share a minimal sample project for this case?

I can't try to connect to the device

Could you please be more specific? Does it have any error or warning?

And what is your Flutter version? (please provide the output of flutter doctor -v) Thanks!

[gingu83]

Hi this is the flutter doctor log

/Users/Gingu/flutter/bin/flutter doctor --verbose
[!] Flutter (Channel stable, 3.16.9, on macOS 14.0 23A344 darwin-arm64, locale it-IT)
• Flutter version 3.16.9 on channel stable at /Users/Gingu/flutter
! The flutter binary is not on your path. Consider adding /Users/Gingu/flutter/bin to your path.
! Warning: dart on your path resolves to /usr/local/Cellar/dart/3.3.0/libexec/bin/dart, which is not inside your current Flutter SDK checkout at /Users/Gingu/flutter. Consider adding /Users/Gingu/flutter/bin to the front of your path.
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 4145645 (4 mesi fa), 2024-01-25 10:06:23 -0800
• Engine revision f40e976bed
• Dart version 3.2.6
• DevTools version 2.28.5
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[!] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/Gingu/Downloads/adt-bundle-mac-x86_64-20131030/sdk
✗ cmdline-tools component is missing
Run path/to/sdkmanager --install "cmdline-tools;latest"
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run flutter doctor --android-licenses to accept the SDK licenses.
See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15E204a
• CocoaPods version 1.13.0

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[!] Android Studio (version unknown)
• Android Studio at /Applications/Android Studio 3.4 Preview.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
✗ Unable to determine Android Studio version.
✗ Unable to find bundled Java version.
• Try updating or re-installing Android Studio.

[✓] Android Studio (version 2020.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)

[✓] Android Studio (version 2021.3)
• Android Studio at /Applications/Android Studio 2.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)

[✓] Android Studio (version 2023.2)
• Android Studio at /Applications/Android Studio 3.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)

[!] Android Studio (version unknown)
• Android Studio at /Applications/Android Studio 4.0 Preview.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
✗ Unable to determine Android Studio version.
✗ Unable to find bundled Java version.
• Try updating or re-installing Android Studio.

[✓] Connected device (4 available)
• iPhone di Gingu (mobile) • 00008130-001A5C280E92001C • ios • iOS 17.4.1 21E236
• iPhone 15 Plus (mobile) • 16D679BA-90C6-4A48-A9EC-FDBB64FD0126 • ios • com.apple.CoreSimulator.SimRuntime.iOS-17-0 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 14.0 23A344 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 124.0.6367.119

[✓] Network resources
• All expected network resources are available.

! Doctor found issues in 4 categories.
Process finished with exit code 0

[gingu83]

This is the build.gradle

plugins {
id "com.android.application"
id "kotlin-android"
id "dev.flutter.flutter-gradle-plugin"
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}

android {
namespace "com.example.altrotestkisok.kioskflutterandroid"
compileSdkVersion flutter.compileSdkVersion
ndkVersion flutter.ndkVersion

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

defaultConfig {
    // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
    applicationId "com.example.altrotestkisok.kioskflutterandroid"
    // You can update the following values to match your application needs.
    // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
    minSdkVersion 24
    targetSdkVersion 34
    versionCode 1
    versionName "1.0"
    multiDexEnabled true
}

buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig signingConfigs.debug
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation files('libs/ConnectionLayer-3.0.41-20230130-release.aar')

}

}

flutter {
source '../..'
}

[gingu83]

My aar library is a custom library and it worka perfectly in a simple android java project. In flutter one, it's imported correctly and classes, objects, ecc. and some calls work perfectly but not all. What can I do? I want to compile it (it's an only flutter android project and I don't need other platform) in the same way

[gingu83]

@huycozy is it possibile why library is a 32 bit?

[huycozy]

Could you share a complete sample project on GitHub? And please add license the code in the repository under some open-source license (e.g. MIT, Apache, BSD, GPL) so that we may look into it.

If AAR lib can't be shared, please provide the error/warning output so that we have more information to investigate further. Thank you.