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Jun 3, 2025 · 3 min read · Activity class provides a number of callback methods, that let an activity know when the state changes or the system is going to stop/create/resume/destroy the activity or going to stop/create/resume/destroy the process that activity resides in. With...
VJojo commentedJun 2, 2025 · 1 min read · Layout defines a structure through which user can interact with your app. The elements of the layout are created in the hierarchy of Views and ViewGroups. A View draws something that user can see and interact with. ViewGroup is an invisible container...
Join discussionJul 7, 2024 · 2 min read · Decorator design pattern saves us from object explosion. Composition is a design technique in OOP which defines has-a relationship between objects. public class Job{ // methods and properties... } Person HAS-A Job public class Person{ privat...
Join discussionJul 4, 2024 · 3 min read · Observer Pattern keeps the objects in the know when something about they care happens. Publishers + Subscribers = Observer Pattern Only in case of Observer pattern : Publisher -> Subject / Observable Subscriber -> Observer This pattern defines one-to...
Join discussionJul 4, 2024 · 2 min read · Need : When we are using inheritance in our application, there comes a situation where our design in no longer scalable. Strategy Pattern helps us resolve this problem. When we are using inheritance, if we observe that multiple child classes are havi...
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