Your Flutter application is created using an older version of the Android embedding

Question

Recently I opened my old project and there is a warning right now that nothing like this was happening before

Warning looks like

Warning
──────────────────────────────────────────────────────────────────────────────
Your Flutter application is created using an older version of the Android
embedding. It's being deprecated in favor of Android embedding v2. Follow the
steps at

https://flutter.dev/go/android-project-migration

to migrate your project.

flutter doctor -v summary

[✓] Flutter (Channel stable, 1.22.2, on Mac OS X 10.15.3 19D76, locale en-GB)
    • Flutter version 1.22.2 at /Users/pkimac/Development/flutter
    • Framework revision 84f3d28555 (6 weeks ago), 2020-10-15 16:26:19 -0700
    • Engine revision b8752bbfff
    • Dart version 2.10.2

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/pkimac/Library/Android/sdk
    • Platform android-30, build-tools 29.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.10.0.rc.1

[!] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] Connected device (1 available)
    • iPhone 11 Pro (mobile) • 7A52F1D0-79F7-471C-AA62-3C106114A1A9 • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)
    ! Error: Paresh’s iPhone has recently restarted. Xcode will continue when Paresh’s iPhone is unlocked. (code -14)

! Doctor found issues in 1 category.

What does this mean and how can I solve this warning?

Answer 1

I got the same error in one of my old projects and this worked for me:

1. In your Android Manifest.xml file, Check the path: /path to your project/android/app/src/main/AndroidManifest.xml

Change your android app naming from:

   <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="Your App Name"
        android:icon="@mipmap/ic_launcher">

To

 <application
        android:name="${applicationName}"
        android:label="Your App Name"
        android:icon="@mipmap/ic_launcher">

2. Next, Upgrade your Android SDK path on your build.gradle file. check the path: /path to your project/android/app/build.gradle

Upgraded mine to:

android {
    compileSdkVersion 31
.....
}

3. Next in your andriod/build.gradle upgrade Kotlin version ext.kotlin_version to:

   buildscript {
        ext.kotlin_version = '1.6.10'
        repositories {
            google()
            jcenter()
        }
   
        dependencies {
            classpath 'com.android.tools.build:gradle:4.1.0'
            classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        }
    } 
   

This will now solve the error. Also after making the changes run flutter clean command and do a fresh build of the project.

For more info, checkout this article https://flutter.dev/go/android-project-migration