Flutter 開發筆記 - 排除 Could not open settings generic class cache for settings file @ macOS 13.2.1, openjdk 19.0.2, Android Studio Electric Eel | 2022.1.1 Patch 2

最近工作上關係，來回顧一下 Flutter app 的開發，預計寫一款非常簡單的 App 試試水溫。結果在 macOS 13.2.1, openjdk 19.0.2, Android Studio Electric Eel | 2022.1.1 Patch 2 環境，預設弄個專案出來卻不能編譯：

Launching lib/main.dart on sdk gphone64 arm64 in debug mode...

Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* What went wrong:

Could not open settings generic class cache for settings file '/Users/UserID/AndroidStudio/usb_displayport_helper/android/settings.gradle' (/Users/UserID/.gradle/caches/7.5/scripts/XXXXXX).

> BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 63

* Try:

> Run with --stacktrace option to get the stack trace.

> Run with --info or --debug option to get more log output.

> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 24s

Exception: Gradle task assembleDebug failed with exit code 1

研究了一下，主因是 JDK 與 Gradle 版本問題，需要多做一些事就能排除了。記錄一下。

此時環境：

% java --version

openjdk 19.0.2 2023-01-17

OpenJDK Runtime Environment (build 19.0.2+7-44)

OpenJDK 64-Bit Server VM (build 19.0.2+7-44, mixed mode, sharing)

這時，在既有專案的左邊上方的 Project 小視窗，挑選 android 目錄，點選右鍵 -> Flutter -> Open Android module in Android Studio -> New Window ，在新的 Android Studio 還沒按 Build 就看到訊息：

Unsupported Java. 

Your build is currently configured to use Java 19.0.2 and Gradle 7.5.

Possible solution:

 - Open Gradle wrapper settings, change `distributionUrl` property to use compatible Gradle version and reload the project

這時就來更換預設的環境： File -> Project Structure -> Project

- Android Gradle Plugin Version: 7.4.2

- Gradle Version: 7.6.1

按下 OK 就會開始抓資料，最後也順利編譯後在模擬器上跑了。