Cannot choose between the following variants of project

该问题是升级android studio3.0导致的。

解决办法：

在build.gradle中

注释掉：

apply plugin: ‘android-apt‘，将apt改成annotationProcessor

以及一些其他问题

 The SourceSet ‘instrumentTest‘ is not recognized by the Android Gradle Plugin. Perhaps you misspelled something?

解决办法：用 androidTest 替换 instrumentTest

原文：https://www.cnblogs.com/kinoyo/p/11974932.html