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.
- butterknife-8.8.1.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.
借鉴网友的解决方法,在引用注解库的module下的build.gradle文件中,添加了如下配置。
android {
...
defaultConfig {
...
javaCompileOptions {
annotationProcessorOptions {
includeCompileClasspath = true
}
}
}
...
}
遗憾的是,添加上述配置之后,仍然出现这个错误;
这个时候转念一想,工程结构是多module形式的,会不会是重复依赖导致的呢?顺着这个想法,到每个module下的build.gradle文件搜索,发现的确在两个module下都依赖了butterknife注解库。
找到问题就很好解决了,只要去除掉其中一个依赖就可以了。
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