Android開發過程中，提示：Annotation processors must be explicitly declared now. 錯誤

錯誤提示：

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.

解決辦法：

在app的build.gradle中添加如下代碼：

android {
    compileSdkVersion 28
    defaultConfig {
        ---
        javaCompileOptions {
            annotationProcessorOptions {
                includeCompileClasspath true
            }
        }
        ----
    }
  

}