在进程间可公用的全局变量

方法一：通过单实例：

public class Globals{

   private static Globals instance;

 

   // Global variable

   private int data;

 

   // Restrict the constructor from being instantiated

   private Globals(){}

 

   public void setData(int d){

     this.data=d;

   }

   public int getData(){

     return this.data;

   }

 

   public static synchronized Globals getInstance(){

     if(instance==null){

       instance=new Globals();

     }

     return instance;

   }

}

在其他类中需要使用时：

Globals g = Globals.getInstance();

g.setData(100);

 

....

int data=g.getData();













方法二：继承application




a) Create a new class that extends Application.

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public class Globals extends Application{    private int data=200;      public int getData(){      return this.data;    }      public void setData(int d){      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()

1 2	Globals g = (Globals)getApplication(); int data=g.getData();