E/LoadedApk: Unable to instantiate appComponentFactory only on Android Q (API 29)

I have searched everywhere about this and still have no solution.

The gradle has minSdkVersion 21 and targetSdkVersion 29

I got error only in API 29, then the app doesn't load and show up blank screen. When i see logcat it gives an error like this :

E/LoadedApk: Unable to instantiate appComponentFactory
java.lang.ClassNotFoundException: Didn't find class "androidx.core.app.CoreComponentFactory" on path: DexPathList[[],nativeLibraryDirectories=[/data/app/com.packagename.appname-BxS7Zs-h0IWwJAVhbjx7aQ==/lib/x86, /data/app/com.packagename.appname-BxS7Zs-h0IWwJAVhbjx7aQ==/base.apk!/lib/x86, /system/lib, /system/product/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.app.LoadedApk.createAppFactory(LoadedApk.java:256)
    at android.app.LoadedApk.updateApplicationInfo(LoadedApk.java:370)
    at android.app.ActivityThread.handleDispatchPackageBroadcast(ActivityThread.java:5951)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1941)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:214)
    at com.android.server.SystemServer.run(SystemServer.java:541)
    at com.android.server.SystemServer.main(SystemServer.java:349)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:908)

I think it seems like from multidex, then i have tried adding following code to gradle app

multiDexKeepFile file('multidex-config.txt')

multiDexKeepProguard file('multidex-config.pro')

my multidex-config.txt

com/packagename/appname/androidx.class

my multidex-config.pro

-keep class androidx.core.app.CoreComponentFactory { *; }

my App class extending MultiDexApplication

public class App extends MultiDexApplication {

    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        MultiDex.install(this);
    }
}

my Manifest

<application
    android:name=".App"
    android:allowBackup="true"
    android:icon="@mipmap/ic_logo"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_logo"
    android:supportsRtl="true"
    android:theme="@style/main"
    android:usesCleartextTraffic="true"
    tools:ignore="GoogleAppIndexingWarning">

my gradle.properties

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

my gradle/app

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'io.fabric'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.packagename.appname"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 7
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        debug {
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            multiDexKeepFile file('multidex-config.txt')
            multiDexKeepProguard file('multidex-config.pro')
            minifyEnabled true
        }
        release {
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            multiDexKeepFile file('multidex-config.txt')
            multiDexKeepProguard file('multidex-config.pro')
            minifyEnabled true
        }
    }
    compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
        sourceCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.android.libraries.places:places:2.2.0'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.cardview:cardview:1.0.0'

    implementation 'com.android.support:multidex:2.0.1'

    implementation 'com.github.vipulasri:timelineview:1.1.0'
    implementation 'de.hdodenhof:circleimageview:3.1.0'
    implementation 'com.yanzhenjie.zbar:camera:1.0.0'
    implementation 'androidx.percentlayout:percentlayout:1.0.0'

    implementation 'com.amitshekhar.android:android-networking:1.0.2'

    implementation 'com.google.firebase:firebase-core:17.2.2'
    implementation 'com.google.firebase:firebase-messaging:20.1.0'
    implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

    implementation 'com.github.bumptech.glide:glide:4.11.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'

    implementation 'com.github.kenglxn.QRGen:android:2.5.0'

    implementation 'com.facebook.android:facebook-android-sdk:4.36.0'

    implementation 'com.jsibbold:zoomage:1.2.0'

    implementation 'androidx.arch.core:core-common:2.1.0'
    implementation 'androidx.arch.core:core-runtime:2.1.0'
}

I really need a solution for this. Help me please, thank you so much!

The error is pointing to the use of androidx CoreComponentFactory class(using AndroidX) but you are using old package com.android.support:multidex

so use androidx dependency as:

implementation 'androidx.multidex:multidex:2.0.1'

instead of

implementation 'com.android.support:multidex:2.0.1'

and make sure to use androidx imports in the application class as

import android.content.Context;
import androidx.multidex.MultiDex;
import androidx.multidex.MultiDexApplication;

public class YourApp extends MultiDexApplication {

    @Override
    protected void attachBaseContext(Context base) {
        MultiDex.install(this);
        super.attachBaseContext(base);
    }
}

Additionally: During the app Load-up, android Q uses the CoreComponentFactory instance internally whether you are using it in manifest or not, which is causing the issue.

Also, add multiDexEnabled true as defaultConfig{multiDexEnabled true }

---

Update: After the RCA, the componentfactory import issue was resolved with the androidx lib imports though there was another issue with the facebook sdk dependency in version 4.36.0 which was resolved by downgrading the version to 4.35.0(or use latest version integration) and also posted here.