Manifest merger failed, error on compiling

Question

Since downloading the latest SDK and installing Android Studio, my project fails to build. I get the following message:

Manifest merger failed with multiple errors

---

My gradle app:

apply plugin: 'com.android.application'

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

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.github.chrisbanes:PhotoView:2.2.0'
    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'
}

My 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.app.clupascu.oavm">

    <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"
        tools:ignore="GoogleAppIndexingWarning"
        tools:replace="android:appComponentFactory">

        <activity
            android:name=".MainPage"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".FirstObchodni"
            android:label="@string/obchodn_akademie"/>

        <activity android:name=".SecondObchodni"
            android:label="@string/_2_obchodn_akademie"/>

        <activity android:name=".VysiiOdborna"
            android:label="@string/_3_vy_odborn_kola"/>
    </application>

</manifest>

In Merged Manifest is written this:

Merging Errors: Error: tools:replace specified at line:6 for attribute android:appComponentFactory, but no new value specified app main manifest (this file), line 5 Error: Validation failed, exiting app main manifest (this file) 

I tried a lot of solutions from other questions, but without result, Thanks a lot.

Answer 1

I faced the same situation while implementing the maps api in my application. I solved it by adding the following code in AndroidManifest.xml and Gradle.properties file.

In AndroidMainfest.xml added this code

    android:appComponentFactory="androidx.core.app.CoreComponentFactory"
    tools:replace="android:appComponentFactory"

In gradle.properties added this code

   android.useAndroidX=true
   android.enableJetifier=true

Answer 2

"tools:replace="android:appComponentFactory" <- this line you're saying to Manifest merger that you're going to provide new value for android:appComponentFactory attribute but you're not doing so. So as I see it you have two options:

1. Remove tools:replace="android:appComponentFactory"

2. Provide new value for android:appComponentFactory" attribute

Hope it helps.