Global Variable in Android
This tip will help you to develop global variable in Android application.
Introduction
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
- 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; } }
- Add the class to the
AndroidManifest
file as an attribute of<application>
tag:<application android:name=".Global" .... />
- 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) { global=((Global)getApplicationContext()); Boolean notification=global.get_notification();}
History
- 26th June, 2013: Initial post
This tip is based on the following blog: