Manifest merger failed

I got this error when I used Android library in my Android project

Android Manifest merger failed: Attribute application@label value=(@string/app_name)

Solution

This means that you have multiple AndroidManifes.xml files where the files cannot be automatically merged. For more see Android developer.

The error also says

Suggestion: add 'tools:replace="android:label"' to <application> element at AndroidManifest.xml:A:B-C:D to override.

I modified the library project from

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example">

    <application
        android:allowBackup="true"
        android:label="@string/app_name"
        android:supportsRtl="true">
        <activity android:name=".SomeActivity"/>
    </application>
</manifest>

To

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:label="@string/app_name"
        android:supportsRtl="true"
        tools:replace="android:label">
        <activity android:name=".SomeActivity"/>
    </application>
</manifest>

And now the android:label is replaced by the label from the parent application.