新手看不懂gradle里头dependencies 里面用apt和provided关键字

[json988]

新手看不懂gradle里头dependencies 里面apt libs.daggerCompiler的用途，请问能指教下么？或者材料。
为什么是apt, 在project structure ->dependencies ->scope中没见过这个

[Sloaix]

android apt(一个编译时注解处理插件)

• https://bitbucket.org/hvisser/android-apt
• Allow to configure a compile time only annotation processor as a dependency, not including the artifact in the final APK or library
• Set up the source paths so that code that is generated from the annotation processor is correctly picked up by Android Studio.（让生成的代码能够被AndroidStudio正确的获取）

povided (gradle 关键字)

• provided - compile-time only dependency(dagger2的注入是编译时生成的，apt也是编译时的，不过这里用了apt获得一些上述的功能)
• package - package-time only dependency
• compile - compile-time and package-time dependency(大多时候我们用的compile)