How can I solve the version of the Android embedding? - flutter

Question

I have this problem. Plz let me know how to solve this problem..
I got this git code from a lesson made about 2years ago.
Also different errors showed up when I made a flutter project using git code.
-> This is the problem
This app is using a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to migrate this app to the V2 embedding.

Answer 1

If you are here because of the flutter 2.10, do this:
Change this:
<application
android:icon="#mipmap/ic_launcher"
android:name="io.flutter.app.FlutterApplication"
android:label="PassesBox"
...
To this:
<application
android:icon="#mipmap/ic_launcher"
android:name="${applicationName}"
android:label="PassesBox"
...

Answer 2

If the application is very old, you should consult the migration guide that the documentation or fial offers you, just like the other answers recommend.
https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects
but if you still have the deprecated application warnning try the following
step one: delete the cache. flutter clean
step two: remove the pubspec.lock file from the root of the project. rm pubspec.lock
step three: update the libraries if you have any very outdated, you can do it manually or through the command. flutter pub upgrade --major-versions (this command will update all the libraries you have, be careful, before evaluating if such an update is necessary in your project).
then you must make some changes at the android folder level
change the gradle.zip in android/gradle/wrapper/gradle-wrapper.properties to a newer version like:
distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
and in android/build.gradle update the version to
classpath 'com.android.tools.build:gradle:7.1.2'
the kotlin version in : ext.kotlin_version = '1.6.10'
and if you were using code obfuscation with proguard-rules.pro
remove any added configurations that reference that file in android/app/build.gradle and you should be left with just this
buildTypes {
release {
signingConfig signingConfigs.release
}
}
finally close the code editor or the IDE you use
and in console run flutter pub get and run your project flutter run
Last but not least, do not forget to update the build version of your application to API 33 or higher and have your android studio updated (VERY IMPORTANT FOR UPDATE, )
android-studio

Answer 3

This has been answered before here on SO.
Here:
Your Flutter application is created using an older version of the Android embedding
And here: How to Fix Flutter Warning: Your Flutter application is created using an older version
You can also look at the source of how to migrate here:
https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects