This package does not compile on Android apps with the newest Android Gradle Plugin, please modify as suggested

Describe the bug Your current configuration throws an error and does not compile on Android for apps that are using one of the latest versions of the Android Gradle Plugin, e.g. 8.3.1 in my case.

For reference, this is my android/settings.gradle file:

pluginManagement {
    def flutterSdkPath = {
        def properties = new Properties()
        file("local.properties").withInputStream { properties.load(it) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        return flutterSdkPath
    }
    settings.ext.flutterSdkPath = flutterSdkPath()

    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")

    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

plugins {
    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
    // Android Gradle Plugin (AGP) Version
    id "com.android.application" version '8.3.1' apply false
    id "org.jetbrains.kotlin.android" version "1.9.21" apply false
    id "com.google.gms.google-services" version "4.4.0" apply false
}

include ":app"

Required Changes

Modify your AndroidManifest.xml to look like this:

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
</manifest>

Modify your build.gradle to increase the compileSdkVersion and add a namespace field, like this:

version '1.0-SNAPSHOT'

buildscript {
    ext.kotlin_version = '1.6.0'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

rootProject.allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 33
    if (project.android.hasProperty("namespace")) {
        namespace 'com.builttoroam.devicecalendar'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
    defaultConfig {
        minSdkVersion 16
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    lintOptions {
        disable 'InvalidPackage'
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_1_8.toString()
    }
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.google.code.gson:gson:2.8.8'
    api 'androidx.appcompat:appcompat:1.3.1'
    implementation 'org.dmfs:lib-recur:0.11.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'
}

Flutter doctor

[✓] Flutter (Channel stable, 3.19.6, on macOS 14.4.1 23E224 darwin-arm64, locale en-US)
    • Flutter version 3.19.6 on channel stable at /Users/valentino/Flutter/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 54e66469a9 (3 weeks ago), 2024-04-17 13:08:03 -0700
    • Engine revision c4cd48e186
    • Dart version 3.3.4
    • DevTools version 2.31.1

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/valentino/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.15.2

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

[✓] Android Studio (version 2023.2)
    • 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 17.0.9+0-17.0.9b1087.7-11185874)

[✓] VS Code (version 1.89.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.86.0

[✓] Connected device (3 available)
    • Valentino’s iPhone (mobile) • 00008130-0018715E26B8001C • ios            • iOS 17.4.1 21E236
    • macOS (desktop)             • macos                     • darwin-arm64   • macOS 14.4.1 23E224 darwin-arm64
    • Chrome (web)                • chrome                    • web-javascript • Google Chrome 124.0.6367.119

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

• No issues found!

builttoroam / device_calendar

This package does not compile on Android apps with the newest Android Gradle Plugin, please modify as suggested #540