Android Studio 2.1 reporting in: solved the issue by resetting SDK. Preferences -> Appearance & Behavior -> System Settings -> Android SDK. Click on Edit to the right of Android SDK location. Next, next, next to complete the wizard and voila!
代码: using System; using System.Collections.Concurrent; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Text.