从零开始的Android新项目4 - Dagger2篇 | markzhai's home



从零开始的Android新项目4 - Dagger2篇 | markzhai's home

Dagger2,起源于Square的Dagger,是一个完全在编译期间进行的依赖注入框架,完全去除了反射。

关于Dagger2的最初想法,来自于2013年12月的Proposal: Dagger 2.0,Jake大神在issue里面也有回复哦,而idea的来源者Gregory Kick的GitHub个人主页也没多少follower,自己也没几个项目,主要都在贡献其他的repository,可见海外重复造轮子的风气比我们这儿好多了。

扯远了,Dagger2的诞生就是源于开发者们对Dagger1半静态化半运行时的不满(尤其是在服务端的大型应用上),想要改造成完整的静态依赖图生成,完全的代码生成式依赖注入解决方案。在权衡了什么对Android更适合,以及对大型应用来说什么更有意义(往往有可怕数量的注入)两者后,Dagger2诞生了。

初衷

Dagger2的初衷就是装逼,啊,不对,是通过依赖注入让你少些很多公式化代码,更容易测试,降低耦合,创建可复用可互换的模块。你可以在Debug包,测试运行包以及release包优雅注入三种不同的实现。


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