Providers are part of state management in flutter. It is an easy and effective way to manage state.
For small apps it is okay to use
setState() for updating data in UI. But for large scale app it becomes horrific and we can’t scale up the app.
Let me clarify necessity of state management in brief. Suppose if you are building an app in which model class is used more than one screen , you can update data on one screen and then pass the updated data through constructor through many classes . It does not look professional.
There are four types of launch modes in android :-
Standard → new instance is created whenever we launch new activity
SingleTask → only one instance will remain in stack. When activity is launched old instance will be called and activity on the top of it will be destroyed
SingleTop → if activity having this launch mode is already on top new Instance will not be created when it is launched but if it is not on top then only new instance will be created
SingleInstance → it is similar to singleTask but new activity will be in new task