android 编译警告:API 'variant.getJav

android studio 打开编译警告：API'variant.getJavaCompile()'is obsolete and has been replacedwith'variant.getJavaCompileProvider()'.It will be removed at the endof2019.

解决方法：选择android studio 稳定版本，例如'com.android.tools.build:gradle:3.1.4'。