Android Studio升级到最新版3.0 Canary 8后，当使用到注解时，报了如下错误： 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 解决办法：在Gradle中添加如下代码

android {    ...        defaultConfig {        ...        javaCompileOptions {             annotationProcessorOptions {                 includeCompileClasspath = true             }         }    }        ...}

且保证多module只有一个依赖了butterknife注解库