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Global Variable in Android

, 26 Jun 2013 CPOL
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This tip will help you to develop global variable in Android application.


When we need to have several variables across applications, we can go for global variable. Here, I am going to explain, defining global variable by extending the Android's Application class. This is the base class for maintaining global application state.

Steps for Declaring Global Variable

  1. Create a class that extends the Application class:
    public  class  Global extends Application {
        private Boolean _notification=false;
        public Boolean get_notification() {
            return _notification;
        public void set_notification(Boolean _notification) {
            this._notification = _notification;
  2. Add the class to the AndroidManifest file as an attribute of <application> tag:
            .... />  
  3. You can access it from any context using the Context.getApplicationContext() method. Now, we can access the global data across the application like:
     Global global;
        public void onCreate(Bundle savedInstanceState) {
            Boolean notification=global.get_notification();} 


  • 26th June, 2013: Initial post

This tip is based on the following blog:


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

General我的做法: Pinmemberwu.qingman10-Jul-13 16:21 
GeneralMy vote of 4 PinmemberSwapnil Mahadev Sonar8-Jul-13 21:24 
QuestionYou should use static members Pinmemberva_dev2-Jul-13 6:11 
QuestionType casting is bad idea PinmemberIzbyakov26-Jun-13 5:08 
GeneralMy vote of 1 PinmemberIzbyakov26-Jun-13 5:06 

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