How to Fix \"Manifest Merger Failed: Attribute application@appComponentFactory Issue\" in Android Projects?

Manifest Merger Failed: Attribute application@appComponentFactory Issue

When building an Android project, you may encounter the error:

ERROR: Manifest merger failed : Attribute application@appComponentFactory is also present at [...]. Suggestion: add 'tools:replace="android:appComponentFactory"' to [element] to override.

This error occurs when multiple dependency libraries declare the same Android application attribute, appComponentFactory. Typically, this issue arises when your project includes both Android Support Libraries (e.g., com.android.support:appcompat-v7:28.0.0) and AndroidX Libraries (e.g., androidx.core:core:1.0.0).

To resolve this issue, you can either migrate your project to use AndroidX libraries exclusively or downgrade your Firebase dependencies.

Migrating to AndroidX

To migrate to AndroidX, follow these steps:

• Update your compileSdkVersion to 28 or later in your build.gradle file.
• Upgrade all your existing Android Support Library dependencies to their AndroidX equivalents.
• Replace tools:context with tools:viewBindingIgnore for all activities, fragments, and layouts.
• Add apply plugin: 'androidx.databinding.databinding' to the bottom of your build.gradle file.
• Rebuild your project.

Downgrading Firebase Dependencies

Alternatively, you can downgrade your Firebase dependencies to versions that do not require AndroidX. However, this is not recommended as it may prevent you from accessing the latest features of Firebase.

To downgrade your Firebase dependencies, use the following versions in your build.gradle file:

implementation 'com.google.firebase:firebase-messaging:17.0.0'

After making these changes, clean and rebuild your project. This should resolve the manifest merger failure issue.

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