A singleton is a design pattern that restricts the instantiation of a class to only one instance. Notable uses include controlling concurrency and creating a central point of access for an application to access its data store. This example demonstrate about How to use singleton class in android.

What is meant by Singleton class?

In object-oriented programming, a singleton class is a class that can have only one object (an instance of the class) at a time. After first time, if we try to instantiate the Singleton class, the new variable also points to the first instance created. … To design a singleton class: Make constructor as private.

Is Singleton good or bad?

The truth is that singletons aren’t inherently bad if they’re used correctly. The goal of the singleton pattern is to ensure only one instance of a class is alive at any one time. … Singletons are very much like the good things in life, they’re not bad if used in moderation.