[Fix] OneSignalConfig.androidlib minSdkVersion and targetSdkVersion for Unity 2021

[shepherd-l]

Description

One Line Summary

Fixes OneSignalConfig.androidlib minSdkVersion and targetSdkVersion Android build errors in Unity 2021

Details

Motivation

Fixes the following Android build error in Unity 2021.3.10 that occurs when calling defaultConfig.minSdk and similarly for defaultConfig.targetSdk. This error does not occur in Unity 2022.3.10.

A problem occurred evaluating project ':unityLibrary:OneSignalConfig.androidlib'.
> Could not get unknown property 'minSdk' for DefaultConfig_Decorated{name=main, dimension=null, minSdkVersion=DefaultApiVersion{mApiLevel=22, mCodename='null'}, targetSdkVersion=DefaultApiVersion{mApiLevel=30, mCodename='null'}, renderscriptTargetApi=null, renderscriptSupportModeEnabled=null, renderscriptSupportModeBlasEnabled=null, renderscriptNdkModeEnabled=null, versionCode=1, versionName=0.1, applicationId=null, testApplicationId=null, testInstrumentationRunner=null, testInstrumentationRunnerArguments={}, testHandleProfiling=null, testFunctionalTest=null, signingConfig=null, resConfig=[], mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[/Users/shepherd/projects/My project (1)/Library/Bee/Android/Prj/Mono2x/Gradle/unityLibrary/proguard-unity.txt], mManifestPlaceholders={}, mWearAppUnbundled=null} of type com.android.build.gradle.internal.dsl.DefaultConfig.

Both Unity versions successfully build when using defaultConfig.minSdkVersion.mApiLevel and defaultConfig.minSdkVersion.mApiLevel

Scope

In the next release, devs need to apply the changes made to OneSignalConfig.androidlib:

1. Delete their current OneSignalConfig.androidlib in their Unity project
2. Go to Window > OneSignal SDK Setup and run the "Copy Android plugin to Assets" step to add the updated OneSignalConfig.androidlib back in their project

Testing

Manual testing

Tested building for Android on a new Unity project (3D Core template) with the OneSignal SDK installed with Unity 2021.3.10f1 and 2022.3.10f1. Also tested building for Android with the OneSignal example app on Unity 2022.3.10f1.

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

---

This change is 

[jinliu9508]

Confirmed that the change works in Unity and Android.