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神马情况，竟然gradle 自动下载下来了，估计也就用了20来分钟的样子，如果你网速还行的话，当你新建一个项目的时候他会给你自动下载该文件的。好吧既然下下来了，咋就开始干活，但是干活之前至少得知道咋使用吧，毕竟也是一个新工具，需要看看产品说明书了，才能发挥它的功效是吧 下面就简单的介绍下他的几个快捷键的使用:
NO.1 Ctrl+N 可以快速的查找你需要打开的类，当你输入类名的时候具有自动补全功能！
- <strong>To open any class in the editor quickly, press Ctrl+N (Navigate | Class) and start typing the name of the class. Choose the class from a drop-down list that appears.
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- You can open any file in your project in a similar way by using Ctrl+Shift+N (Navigate | File)</strong>
NO.2 Ctrl+Space 自动补全功能 ，相当于eclipse中的Ctrl+/
- The Code Completion feature lets you quickly complete different kinds of statements in the code. For example, start typing a class name and press Ctrl+Space to complete it. When multiple choices are available, they are shown in the lookup list.
NO.4 Ctrl+Q 快速的查看的 类，函数的 文档问信息描述
- To quickly see the documentation for the class or method used at the editor's caret, press Ctrl+Q (View | Quick Documentation).
NO.4 Ctrl+B 导航显示相关关联信息。可以按住Ctrl 点击方法进入到实现类方法中
To navigate to the declaration of a class, method or variable used somewhere in the code, position the caret at the usage and pressCtrl+B. You may also click the mouse on usages with theCtrl key pressed to jump to declarations.
Ctrl+D 备份选中行的信息（Xcode 中始终没找到。有哪个大神知道给我留言万分感谢） - Ctrl+D in the editor duplicates the selected block or the current line when no block is selected.
Android Studio 快捷键使用、
工程快速修复 ALT + ENTER
格式化化代码 CTRL + ALT + L (Win)
OPTION + CMD + L (Mac)
查看选中API信息 CTRL + Q (Win)
F1 (Mac)
选中方法查看参数信息 CTRL + P
普通方法 ALT + Insert (Win)
CMD + N (Mac)
进入源代码 F4 (Win)
CMD + down-arrow (Mac)
删除整行代码 CTRL + Y (Win)
CMD + Backspace (Mac)
查找信息 CTRL + ALT + SHIFT + N (Win)
OPTION + CMD + O (Mac)
构建项目 CTRL + F9 (Win)
CMD + F9 (Mac)
构建项目并运行 SHIFT + F10 (Win)
CTRL + R (Mac)
断点显示 ALT + 1 (Win)
CMD + 1 (Mac)
显示隐藏导航栏 ALT + left-arrow; ALT + right-arrow (Win)
CTRL + left-arrow; CTRL + right-arrow (Mac)
还有很多信息，就不一一翻译了，大家去查看官方文档吧！ http://blog.csdn.net/liaoyp_ios_android/article/details/8943464
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