Flutter: Lost connection to device (production app)

Question

In both debug mode and the app uploaded to play store, when I open the app for the very first time, it crashes. Though if I open it again, everything works fine then.

I/zygote64(11974): Rejecting re-init on previously-failed class java.lang.Class<com.google.firebase.messaging.FirebaseMessagingService>: java.lang.IllegalAccessError: Class com.google.firebase.iid.zzb extended by class com.google.firebase.messaging.FirebaseMessagingService is inaccessible (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.ved.mentor101app-AbvtNHTF_HGKeS2lffOLiw==/base.apk!classes3.dex)
Lost connection to device.

D/AndroidRuntime(11974): Shutting down VM
E/AndroidRuntime(11974): FATAL EXCEPTION: main
E/AndroidRuntime(11974): Process: com.ved.mentor101app, PID: 11974
E/AndroidRuntime(11974): java.lang.RuntimeException: Unable to instantiate service io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService: java.lang.ClassNotFoundException: Didn't find class "io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/com.ved.mentor101app-AbvtNHTF_HGKeS2lffOLiw==/base.apk"],nativeLibraryDirectories=[/data/app/com.ved.mentor101app-AbvtNHTF_HGKeS2lffOLiw==/lib/arm64, /data/app/com.ved.mentor101app-AbvtNHTF_HGKeS2lffOLiw==/base.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]]

E/AndroidRuntime(11974):    Caused by: java.lang.IllegalAccessError: Class com.google.firebase.iid.zzb extended by class com.google.firebase.messaging.FirebaseMessagingService is inaccessible (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.ved.mentor101app-AbvtNHTF_HGKeS2lffOLiw==/base.apk!classes3.dex)
E/AndroidRuntime(11974):        ... 13 more
I/zygote64(11974): Do partial code cache collection, code=61KB, data=44KB
I/zygote64(11974): After code cache collection, code=61KB, data=44KB
I/zygote64(11974): Increasing code cache capacity to 256KB
I/Process (11974): Sending signal. PID: 11974 SIG: 9er

Complete debug statement(can't upload in the text since StackOverflow doesn't allow its length):

// flutter doctor -v:
flutter doctor -v
[√] Flutter (Channel stable, v1.2.2-pre.1, on Microsoft Windows [Version 10.0.15063], locale en-US)
    • Flutter version 1.2.2-pre.1 at C:\Users\Dell\flutter
    • Framework revision 03b53e0901 (7 weeks ago), 2019-04-20 19:15:26 +0530
    • Engine revision 3757390fa4
    • Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at C:\Users\Dell\AppData\Local\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
    • All Android licenses accepted.

[√] Android Studio (version 3.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 33.4.1
    • Dart plugin version 182.5215
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[√] VS Code (version 1.34.0)
    • VS Code at C:\Users\Dell\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.1.0

[√] Connected device (1 available)
    • RMX1801 • 8843cc23 • android-arm64 • Android 8.1.0 (API 27)

• No issues found!


  [1]: https://i.stack.imgur.com/ZcIaC.png
  [2]: https://i.stack.imgur.com/NzpLH.png
  [3]: https://i.stack.imgur.com/EnqNV.png

Answer 1

What finally helped was:

in app level build.gradle

 defaultConfig {      
    
    minSdkVersion 23
    
}

in project level gradle.properties add

org.gradle.jvmargs=-Xmx1536M
android.useAndroidX=true
android.enableJetifier=true
android.enableR8=true

in build.gradle add

dependencies {
    classpath 'com.android.tools.build:gradle:3.4.2'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.google.gms:google-services:4.2.0'
}

Your gradle version should be greater than 5

you can skip that Kotlin plugin if you are not using Kotlin support Dont forget to run flutter clean and then flutter pub upgrade

These changes helped me preventing my app crashes, It should help you too.