Singleton Design Pattern in Android

 - Singleton pattern is one of the simplest design patterns in Java.This pattern provides  one of the best ways to create an object.  
 - The Singleton's purpose is to control object creation, limiting the number of obejcts to  one only.   
 - Since there is only one Singleton instance, any instance fields of a Singleton will occur only once per class, just like static fields.   
 - Singletons often control access to resources such as database connections or    sockets.  
   Example : Whenever you create database in android sqlite, use Sigleton pattern for initialize database class object to avoid # of creation of database object and database object leak problem.  
 
 

//This method will return single database object at a time to use  

public static DatabaseHandler getInstance(Context context) {  
   if (mInstance == null) {  
     mInstance = new DatabaseHandler(context);  
   }  
   return mInstance;  
 }  

//Now use like this in any activity where you want to initialize database object

  dbHandler = DatabaseHandler.getInstance(this);  
 * This will create new database object or return if already exist in memory.