As错误提示： attribute value must be constant

If you are using layout resources in Epoxy annotations then for library projects add Butterknife's gradle plugin to your buildscript.

buildscript {
  repositories {
    mavenCentral()
   }
  dependencies {
    classpath 'com.jakewharton:butterknife-gradle-plugin:10.1.0'
  }
}

and then apply it in your module:

apply plugin: 'com.android.library'
apply plugin: 'com.jakewharton.butterknife'

Now make sure you use R2 instead of R inside all Epoxy annotations.

总结就是引入butterknife 用R2 替换所有的R 就可以了