Manifest merger failed : Attribute application@appComponentFactory - Androidx

When I'm building Gradle with androidx I get the following error. Please help me to solve this issue.

> Error Message: Manifest merger failed : Attribute > application@appComponentFactory > value=(android.support.v4.app.CoreComponentFactory) from > [com.android.support:support-compat:28.0.0] > AndroidManifest.xml:22:18-91 is also present at > [androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86 > value=(androidx.core.app.CoreComponentFactory).

Manifest:

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".activities.SplashActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".activities.LoginActivity" />
        <activity android:name=".activities.RegisterActivity" />
        <activity
            android:name=".activities.HomeActivity"
            android:label="@string/title_activity_home"
            android:theme="@style/AppTheme.NoActionBar" />
        <activity
            android:name=".activities.BookDetailsActivity"
            android:label="@string/title_activity_book_details"
            android:theme="@style/AppTheme.NoActionBar"/>
        <activity android:name=".activities.AddBookActivity" />
    </application>

</manifest>

Build.Gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.kanwarpreet.dealmybook"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.jakewharton:butterknife:10.1.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:10.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

Put these flags in your gradle.properties

android.enableJetifier=true
android.useAndroidX=true

After hours of struggling, I solved it by including the following within app/build.gradle:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

Put these flags in your gradle.properties

android.enableJetifier=true
android.useAndroidX=true

Changes in build.gradle:

implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.google.android.material:material:1.1.0-alpha04'

Refer to: https://developer.android.com/jetpack/androidx/migrate

Reason of this error-

Because after upgrade, androidx.core:core is accessed somewhere, when your project is still not using androidx. So classes like CoreComponentFactory and many others are now found at two places - androidx.core:core and com.android.support:support-compat. That's why this error occured.

What is solution?

You should migrate to AndroidX. If you don't know about AndroidX. Please read What is AndroidX?

How to migrate your project

After Android Studio 3.2 (September 2018), there is direct option to migrate existing project to AndroidX. This refract all packages automatically.

Before you migrate, it is strongly recommended to backup your project.

>### Existing project

• Android Studio > Refactor Menu > Migrate to AndroidX...
• It will analysis and will open Refractor window in bottom. Accept changes to be done.

>### New project

Put these flags in your gradle.properties

android.enableJetifier=true
android.useAndroidX=true

Check @Library mappings for equal AndroidX package.

Check @Official page of Migrate to AndroidX

Error explicitly says-

> [com.android.support:support-compat:28.0.0] > AndroidManifest.xml:22:18-91 is also present at > [androidx.core:core:1.0.0]

AndroidX is the latest support library from Google. It contains all previous components from all older appcompat versions. Do NOT use appcompat-v-any number. Instead, use a similar component from AndroidX libraries. Remove the numbered support libraries from your Gradle and your code wherever it is imported. Then sync your gradle.

Component similarity table can be found here. Also, follow the steps mentioned in Migrating to AndroidX.

Again, stop using any previous appcompat numbered versions. There's only AndroidX now.

Hope this helps.

you have to move on the Androidx because your project is using some feature from there.so you need to migrate to AndroidX follow these snippets

look at this second snippet

One suggestion to find out the exact reason is to open the manifest file and in bottom you will see a Merge Manifest option where you will see exact reason for failure.

See below image

Just add a line into gradle.properties

android.enableJetifier=true
android.useAndroidX=true

Project-wide Gradle settings. IDE (e.g. Android Studio) users: Gradle settings configured through the IDE will override any settings specified in this file. For more details on how to configure your build environment visit http://www.gradle.org/docs/current/userguide/build_environment.html

Specifies the JVM arguments used for the daemon process. The setting is particularly useful for tweaking memory settings

org.gradle.jvmargs=-Xmx1536m
android.enableJetifier=true
android.useAndroidX=true

When configured, Gradle will run in incubating parallel mode. This option should only be used with decoupled projects. More details, visit http://www.gradle.org/docs/current/userguide/multi_project_builds.html

sec:decoupled_projectsvorg.gradle.parallel=true

I also faced this problem because I was using some external library in my project and one of them was not converted into AndroidX.

add below code to android/build.gradle under buildscript ext

googlePlayServicesVersion = "16.0.0"
googlePlayServicesVisionVersion = "17.0.2" 

and below code to gradle.properties

android.enableJetifier=true
android.useAndroidX=true

I let Android Studio convert my Relative layout views to Constraint layout. So Android Studio added one of the com.andriod.support... while I added the androidx... dependency when I removed the second one the error was gone.

dependencies {
    implementation "androidx.constraintlayout:constraintlayout:2.1.0"
    implementation 'com.android.support.constraint:constraint-layout:2.0.4'
}

This was my error:

Manifest merger failed : Attribute application@appComponentFactory value=(androidx.core.app.CoreComponentFactory) from [androidx.core:core:1.3.2] AndroidManifest.xml:24:18-86
is also present at [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91 value=(android.support.v4.app.CoreComponentFactory).
Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:7:3-26:17 to override.

 implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:one.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

In manifest add tools:replace="android:theme" to your application