What is Android Application Architecture?
Android Application Architecture refers to the overall design and structure of an Android app. It includes the way in which the different components of an app, such as activities, services, content providers, and broadcast receivers, are organized and interact with each other to create a functioning application.
There are several common architectural patterns that are often used in Android app development, such as Model-View-Controller (MVC), Model-View-Presenter (MVP), and Model-View-ViewModel (MVVM).
MVC separates an application into three interconnected components: the Model (data and business logic), the View (user interface), and the Controller (handles user input and coordinates communication between the Model and View).
MVP builds on the MVC pattern, with the Presenter acting as an intermediary between the View and Model, and handling most of the business logic.
MVVM is a more modern pattern that further separates the View and Model layers, and introduces the ViewModel as an intermediary between them. The ViewModel communicates with the Model to retrieve and manipulate data, and exposes this data to the View through observable properties.
Choosing the right architecture pattern for an Android app depends on various factors, such as the complexity of the application, the size of the development team, and the requirements for maintainability and scalability.
Difference between them?
The main difference between the different Android app architectures (MVC, MVP, MVVM) lies in how they separate and organize the components of the app, and how they handle communication between these components. Here are some key differences between them:
Model-View-Controller (MVC):
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The Model represents the data and business logic of the app.
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The View is responsible for displaying the data and receiving user input.
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The Controller handles user input and communicates between the Model and View.
Model-View-Presenter (MVP):
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The Model represents the data and business logic of the app.
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The View is responsible for displaying the data and receiving user input.
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The Presenter acts as an intermediary between the View and Model, and handles most of the business logic.
Model-View-ViewModel (MVVM):
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The Model represents the data and business logic of the app.
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The View is responsible for displaying the data and receiving user input.
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The ViewModel acts as an intermediary between the View and Model, and exposes data to the View through observable properties. It communicates with the Model to retrieve and manipulate data.
Some key differences between these architectures are:
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In MVC, the Controller handles user input, while in MVP and MVVM, the Presenter and ViewModel respectively handle user input and communicate with the Model.
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In MVP and MVVM, the Presenter/ViewModel act as an intermediary between the View and Model, while in MVC, the Controller communicates directly with both the View and Model.
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In MVVM, the ViewModel exposes data to the View through observable properties, which means that the View can automatically update itself when the data changes. This is not the case in MVC or MVP, where the View needs to explicitly request updated data from the Model or Presenter.
