为什么出现Unsupported major.minor version 52.0？

You get this error because a Java 7 VM tries to load a class compiled for Java 8

Java 8 has the class file version 52.0 but a Java 7 VM can only load class files up to version 51.0

In your case the Java 7 VM is your gradle build and the class is com.android.build.gradle.AppPlugin

升级Java8，顺利解决问题