Support compiling with Android SDK 36 (default in Flutter 3.35)

[hagerf]

Is there an existing issue?

No

• I have searched existing issues

Use case

I just recently tried to update the gradle plugin to 8.13.0 in my flutter app and unfortunately it now fails for objectbox, since it uses android compile sdk version 31, and at least 34 is required.

This is what I got, all 19 issues are from objectbox:

A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
    19 issues were found when checking AAR metadata:

       1.  Dependency 'androidx.fragment:fragment:1.7.1' requires libraries and applications that
           depend on it to compile against version 34 or later of the
           Android APIs.

           :objectbox_flutter_libs is currently compiled against android-31. 

Proposed solution

Update the compile sdk to a higher version, preferably the highest version, 36.

[sumitsharansatsangi]

@greenrobot-team , Please fix this issue.

[greenrobot-team]

Thanks for notifying us!

It appears that androidx.fragment is a dependency of io.flutter:flutter_embedding_debug, which seems to be automatically added to project :objectbox_flutter_libs by the Flutter plugin? So these versions should depend on the Flutter SDK version.

However, the example in this repo already depends on androidx.fragment version 1.7.1 and builds and runs fine with Flutter SDK 3.35.2 where flutter.compileSdkVersion is 36. However, it uses Android Gradle plugin version 8.2.1.

I suspect that later versions of the Android Gradle plugin have introduced a more restrictive check on the Android compile SDK of dependencies?

In any case, we should likely increase the Android compile SDK of the ObjectBox Flutter packages to match the latest Flutter SDK.

And likely also update the Android plugin to 8.7.0 as the Flutter plugin warns support for older versions will be removed in an upcoming SDK.

In the meantime, I guess a workaround is to downgrade the Android Gradle plugin.

@hagerf Out of curiosity, why do you need to update the Gradle plugin to version 8.13?

For our reference, the internal issue for this is objectbox/objectbox-dart#155

[hagerf]

Great, thanks. I have no particular need right now to use the latest gradle plugin version, I just noticed this when upgrading.

[greenrobot-team]

Release 5.0.0 is available which fixes this issue.

To update to this release, for a Flutter project run flutter pub upgrade or for a Dart Native project dart pub upgrade.

Edit: To upgrade to this major release run flutter pub upgrade objectbox --major-versions
(or for Dart Native apps dart pub upgrade objectbox --major-versions).