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
Cannot choose between the following variants of project
原文：https://www.cnblogs.com/kinoyo/p/11974932.html