ButterKnife不同版本配置

7.0.1版本

compile 'com.jakewharton:butterknife:7.0.1'

Android studio3.0以上版本需要另外配置

annotationProcessor 'com.jakewharton:butterknife:7.0.1'

如果还报如下错

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 (com.jakewharton:butterknife:7.0.1)
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.

需要在主module 配置如下信息，注意 主module

 defaultConfig {
         ····
        javaCompileOptions {
            annotationProcessorOptions {
                includeCompileClasspath = true
            }
        }
    }

目前7.x版本已无法使用（2019.8.21）

8.0.1版本

module

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'

  ···
  
dependencies {
    compile 'com.jakewharton:butterknife:8.0.1'
    apt 'com.jakewharton:butterknife-compiler:8.0.1'
}

project

dependencies {
          ···
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    }
}

8.5.1版本

module

apply plugin: 'com.android.library'
apply plugin: 'com.jakewharton.butterknife'
   ···
dependencies {
  compile 'com.jakewharton:butterknife:8.5.1'
  annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
}

project

dependencies {
          ···
        classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1'
    }
}

版本越高反而越复杂，是为了自由灵活考虑，不过真的好坑！