錯誤：Gradle sync failed: Could not download junit.jar (junit:junit:4.12): No cached version available

1.錯誤：Gradle sync failed: Could not download junit.jar (junit:junit:4.12): No cached version available for 解決方案： 1.setting->查找Gradle,在頁面內將如下圖所示的勾選去掉，點擊ok 3.「Build"->"clean Project" 會出現如下所示錯誤提示： Error:A

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