android中实现全局变量

cs870101

于 2010-05-07 22:05:00 发布

阅读量1k

点赞数

分类专栏： android 文章标签： android application string variables class

android 专栏收录该内容

4 篇文章

订阅专栏

本文介绍如何通过继承Android的Application类来创建自定义的应用基类，并在其中添加成员变量及对应的getter和setter方法，以便在整个应用程序中全局访问这些变量。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

extend the base android.app.Application class and add member variables like so:

public
 
class
 
MyApplication
 
extends
 
Application
 
{




    
private
 
String
 someVariable
;




    
public
 
String
 getSomeVariable
()
 
{


        
return
 someVariable
;


    
}




    
public
 
void
 setSomeVariable
(
String
 someVariable
)
 
{


        
this
.
someVariable 
=
 someVariable
;


    
}



}

In your android manifest you must declare the class implementing android.app.Application:

<application
 
android:name
=
"MyApplication"
 
android:icon
=
"@drawable/icon"
 
android:label
=
"@string/app_name"
>

Then in your activities you can get and set the variable like so:

// set



((
MyApplication
)
 
this
.
getApplication
()).
setSomeVariable
(
"foo"
);





// get



String
 s 
=
 
((
MyApplication
)
 
this
.
getApplication
()).
getSomeVariable
();