Android build fails on AGP 8+ due to invalid package attribute in library AndroidManifest.xml

[raj-here]

Android Build Failure on AGP 8+

Summary

Android builds fail when using rollbar_flutter (v1.5.1 – latest) with Android Gradle Plugin 8+.

AGP 8+ no longer supports defining a library module’s namespace using the package attribute in AndroidManifest.xml. The plugin still relies on this deprecated mechanism, causing the build to fail.

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Error

Incorrect package="com.rollbar.flutter" found in source AndroidManifest.xml

Setting the namespace via the package attribute in the source AndroidManifest.xml
is no longer supported.

Execution failed for task ':rollbar_flutter:processDebugManifest'

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Affected File

rollbar_flutter/android/src/main/AndroidManifest.xml

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

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Expected Behavior

The plugin should build successfully with modern Android toolchains (AGP 8+).

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Actual Behavior

The Android build fails during processDebugManifest, blocking all Android builds.

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Environment

Flutter: 3.35.7 (stable)
Dart: 3.9.2
rollbar_flutter: 1.5.1 (latest)

Android SDK: 35
Target SDK: 35
Gradle: 8.12
Android Gradle Plugin: 8.x
OS: macOS 15.1 (Apple Silicon)

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Steps to Reproduce

flutter clean
flutter pub get
flutter run

Or:

flutter build apk --debug

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Root Cause

Android Gradle Plugin 8+ disallows defining a namespace via the package attribute in library manifests.

The namespace must be declared in the module’s build.gradle file.

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[linear]

SDK-572