在进程间可公用的全局变量

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方法一：通过单实例：

publicclass Globals{

   privatestatic Globals instance;

   // Global variable

   privateint data;

   // Restrict the constructor from being instantiated

   privateGlobals(){}

   publicvoid setData(intd){

     this.data=d;

}

   publicint getData(){

     returnthis.data;

}

   publicstatic synchronized Globals getInstance(){

     if(instance==null){

       instance=newGlobals();

}

     returninstance;

}

}

在其他类中需要使用时：

Globals g = Globals.getInstance();

g.setData(100);

....

intdata=g.getData();

方法二：继承application

a) Create a new class that extends Application.

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publicclass Globals extendsApplication{
   privateint data=200;
 
   publicint getData(){
     returnthis.data;
   }
 
   publicvoid setData(intd){
     this.data=d;
   }
}

b) Add the class to the AndroidManifest file as an attribute of <application> tag:

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<application
   android:name=".Globals"
   .... />

c) Then you can access your global data from any Activity by callinggetApplication()

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Globals g = (Globals)getApplication();
intdata=g.getData();

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