Android studio 報錯: Could not resolve com.android.support:support-annotations:25.4.0.

一個AS項目一段時間沒有打開,今天運作突然報錯: Could not resolve com.android.support:support-annotations:25.4.0.

根據 https://developer.android.com/studio/write/annotations.html 進行配置後,可以正常運作了.

解決辦法:

在項目的 root gradle 的 repositories中添加 

maven { url '<your sdk path>/extras/android/m2repository' }
           

比如我的:

maven { url 'E/:/Wendy/android-sdk-windows/extras/android/m2repository' }
           

然後在 app gradle 中添加:

implementation 'com.android.support:support-annotations:25.4.0'
           

async後,運作正常.