1.安装环境（jre java 运行环境,jdk java 开发工具包）
2.android studio
一、快捷键的使用
1.
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.
You can open any file in your project in a similar way by using Ctrl+Shift+N (Navigate | File)
2.
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+空格 to complete it. When multiple choices are available, they are shown in the lookup list.
