How to Resolve Manifest Merger Error: Attribute Application@AppComponentFactory?

Manifest Merger Error: Attribute Application@AppComponentFactory

When building an Android app, you may encounter an error related to the appComponentFactory attribute in the manifest merger. This error occurs when multiple libraries in your project include the same attribute with different values.

In your specific case, the error is caused by a conflict between the appComponentFactory attribute values in the AndroidManifest.xml files of [androidx.core:core:1.0.0] and [com.android.support:support-compat:28.0.0]. This suggests that you are using both AndroidX and support libraries in your project.

To resolve this issue, you have two options:

• Migrate to AndroidX:

  • Update your app to use Jetpack (AndroidX) libraries, following the instructions in [Migrating to AndroidX](https://developer.android.com/jetpack/androidx/).
  • Update your compileSdkVersion to 28 or later.
  • Upgrade com.android.tools.build:gradle to v3.2.1 or later.

• Downgrade your firebase dependencies:

  • This is not recommended as it is only a temporary fix, and you will need to migrate to AndroidX eventually.

Once you have chosen a solution, update your dependencies in the project-level build.gradle file based on the following:

If migrating to AndroidX:

dependencies {
    implementation "androidx.core:core:1.0.0"
    // Remove the support library dependency
}

If downgrading firebase dependencies:

dependencies {
    implementation "com.google.firebase:firebase-messaging:18.0.0"
    // Keep the support library dependency
}

Ensure that your manifest.xml file contains the following element to override the default value:

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

After making these changes, rebuild your project and the error should be resolved.

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