Failed to resolve:com.android.support:appcompat-v7:27.+問題解決 建立新工程出現這個問題,在網上查資料說要在SDK安裝repository,然而我的已經安裝了。 Failed to resolve:com.android.support:appcompat-v7:27.+問題解決 解決辦法: 點選左上角File>ProjectStructure>app>Dependencies Failed to resolve:com.android.support:appcompat-v7:27.+問題解決 Failed to resolve:com.android.support:appcompat-v7:27.+問題解決 Failed to resolve:com.android.support:appcompat-v7:27.+問題解決 點選OK>OK,重新建構項目。