Annotation processors must be explicitly declared now. The following dependencies on the compile cl

Annotation processors must be explicitly declared now.  The following dependencies on the compile classpath are found to contain annotation processor.  Please add them to the annotationProcessor configuration.   - butterknife-7.0.1.jar

解决方法：

如上图，在defaultConfig中添加配置即可：

//添加如下配置就OK了
        javaCompileOptions { annotationProcessorOptions { includeCompileClasspath = true } }