http://www.zhihu.com/question/30432152
In a nutshell, rely on management and task execution.
Like the bundler+rake inside Ruby,
Like the Cocoapods in iOS,
Like the Npm+grunt in node.
In layman's words: What third-party libraries are needed for your project, which will help you to download them all and compile them in the specified location, you can import and use them directly.
It is based on Apache Ant and maven, but it is not particularly useful, to introduce a library, but also to write a lot of lines of XML, The trouble is dead. And they are weaker in mission execution, so gradle is growing and being respected by Google.
Yang two Namu
Links: http://www.zhihu.com/question/30432152/answer/48340251
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How to understand Gradle in a popular way