常用的快捷键整理，参见下面的文章：
http://mengdd.github.io/Android/Tools/IDE/2016/10/27/android-studio-shortcuts-used-frequently/
- 查看最近的更改，并且可以revert
Alt + Shift + C - Use ⇧⌘⏎ to complete a current statement such as if, do-while, try-catch, return (or a method call) into a syntactically correct construct (e.g. add curly braces).
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- Use ⌥Space (View | Quick Definition), to quickly review definition or content of the symbol at caret, without the need to open it in a new editor tab.
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