体验最新版AndroidStudio3.0 Canary 8的时候，发现之前项目的butter knife报错，用到注解的应该都会报错Error:Execution failed for task ':app:javaPreCompileDebug'.> 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  Alternatively, set android.defaultConfig.javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true to continue with previous behavior.  Note that this option is deprecated and will be removed in the future.  See https://developer.android.com/r/tools/annotation-processor-error-message.html for more details.在app的build中android {    ...    defaultConfig {        ...        //添加如下配置就OK了        javaCompileOptions { annotationProcessorOptions { includeCompileClasspath = true } }    }    ...}