android 比较符合android构架，优雅的定义全局变量

android.app.Application

 

api 是这样描述的。

 

Base class for those who need to maintain global application state. You can
provide your own implementation by specifying its name in your
AndroidManifest.xml's <application> tag, which will cause that class
to be instantiated for you when the process for your application/package is
created.

 

 

所以可以定义一个application,并在AndroidManifest.xml声明，

 

便可以在其他 activity 中通过 (application)getApplicationContext()获取该实例来操作变量。

 

 

当然java通用做法设置静态变量也是可行的！