1.参考

　　http://*.com/questions/28295933/difference-between-build-gradleproject-and-build-gradlemodule

　　在Gradle Scripts下有两个build.gradle ，如下图中的build.gradle(Project:Leaks)和build.gradle(Module:app)

2.build.gradle(Project:Leaks)

　　Top-level build file where you can add configuration options common to all sub-projects/modules.

　　Each project contains a top-level gradle file. It usally contains common configs for all modules. Whatever is included in this top-level gradle, it will affect all modules.

　　它是*配置文件，包含全局配置。在这个文件里的配置项被展开到model下的guild.gradle中。

3.build.gradle(Module:app)

　　Build file of your specific module (where you add your dependencies, signing configs, build types, flavors, etc)

　　All modules have a specific gradle file. Whatever is included in this gradle file, it will only affect the module that is included on.

　　它是局部配置文件，这个文件中的配置项只在引用它的模块中有作用。

　　注意：一般加引用库时在module的build.gradle中加。