One of the crucial parts of the Android app development is choosing an Android architectural pattern. There are a few doubts that most developers and startups face during the development process. Being a leading Android app development company, we decided to solve this query once and for all. This blog will tell you the basics of the Android app architecture and why choose MVP over MVC.
In the modern world of technology, an architectural pattern with an efficient decoupled system is recognized as a crucial virtue to any corporation. This is due to the fact that a decoupled system can lower the value of maintenance cost. It also helps android app developers to make instant modifications in the coding part without affecting the entire system.
Further, the decoupled system promotes parallel development. It can divide work among different android developers, which will cut down the development time.
Herein, we are going to explain the two most famous patterns of Android application architecture. They are called MVC (Model – View – Controller) and MVP (Model – View – Pattern).
Before figuring out which Architecture of Android pattern is the best, let’s have a look at some of the conditions as to why does an app needs a good architecture? What does an app get from an ideal architecture? And, the different types of architectural patterns.
Why Does an Application Need a Good Architecture?
One of the simplest answers is that everything should be planned in a proper way, and this is something, which is bound to happen when it comes to Android app development. In this way, if you are going to work on any Android project, then it needs to be done by choosing an app architecture first.
In case, if you would not choose the right one, then you could probably face the following problems during the app development process:
- It creates the complexity to write the code for Unit Testing ( Unit Testing encourages developers to modify the source code).
- You might be unable to keep track of the logic, which is inside the class.
- It may be a chance that it could be difficult for any other Android developer to maintain and add the new features to your existing code.
If you are planning on developing an Android application, check out the following points –
What Does an App Get from an Ideal Android OS Architecture?
The architecture separates and defines a clear single role for every module in an Android application.
- Focus on Business Logic:
An ideal architecture separates the code in such a manner where a developer can focus on business logic instead of another code improvement.
- Low-cost Maintenance:
Choosing an ideal architecture does not take much time in order to change the logic in the coding part (if it would require in the future). Also, an ideal architecture provides features like ‘easy to add’ and ‘remove’ in the coding part. Hence, it reduces the cost of maintenance.
Types of Architectural Patterns
Currently, there are three major architecture patterns for Android applications, such as:
- Standard Android (Model – View – Controller)
- Clean Architecture (Model – View – Presenter)
- Data-binding MVVM (Model – View – ViewModel)
1. Standard Android:
This is a default approach when it comes to architecting Android apps. And, the ‘Activity’ is responsible to process the data and updating the views. Activity act as a “Controller” in MVC model. However, there are some extra responsibilities as it should be part of the “View”.
The Problem with the Standard Android: The problem is faced by the Standard Android is that both “Fragment” and “Activity” have become large in sizes, and they are quite difficult to test by Android developers.
2. Clean Architecture:
When it comes to Clean Architecture, it is commonly known as MVP (Model – View – Presenter). The Clean Architecture consists of three major layers –
a) Presentation Layer includes how the application shows the data to the user.
b) Domain Layer includes what are the core functions of the application.
c) Data Layer includes how the data can be accessed.
The Presentation layer sits as the outermost layer. The Domain layer sits in the middle layer. And, the Data Layer resides in the inner layer.
3. Data-binding MVVM:
The ViewModel recovers the data from the “Model” when it is requested from the “View” through the Android data framework. With the Data-binding MVVM pattern, both “Activities” & “Fragments” have become lightweight. Moreover, to write unit tests for Android developers also becomes easy because of the “ViewModels” which are coupled from the view.
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MVC (Model – View- Controller) on Android
In this era, where the UI (User Interface) logic inclines to change more frequently than the business logic. Therefore, developers were finding out the way of separating user interface functionality.
It is the data layer, which is responsible for managing the business logic and handling network or database API.
It is the User Interface (UI) layer. It is a way of representation of the data from the model.
It is the logic layer. It gets notify the user’s behavior and updates to the Model as required.
Challenges in MVC
A few years ago, Android developers started using MVC architectural pattern in the process of creating an Android app. But the app was far from being robust due to using MVC pattern. Robust was not only the hurdle faced by developers, but the code was not cleared.
We found two reasons for this problem –
- The continuous changes in the User Interface (UI).
- The lack of an architecture, which could provide flexibility as what developers needed.
In MVC, both the ‘Controller’ and the ‘View’ depend on the ‘Model’. The ‘Controller’ updates the data, and the ‘View’ gets the data.
All in whole, MVC is not meant to suffice developers’ needs. There are some reasons because of which developers abandoned the MVC:
– MVC makes the code more complicated for Android application developers.
– For developers, it is impossible to perform the unit test on their own.
You might have several questions in your mind like:
– What is the best architecture pattern for Android applications?
– How can you apply that pattern in the most effective way?
One thing that you need to understand is that there is not a single architecture that can fulfill the project’s needs. This is due to the fact that every design pattern is abstract, plus its implementation also depends on specific requirements.
Therefore, Android app developers can pick different architectures according to applications. Even though, in a complicated project, each module possesses its own structure.
MVP (Model – View – Presenter) on Android
When it comes to choosing between those architecture patterns, MVP is strongly recommended in the Android application development. The definition is not always an interesting part, yet it is super important.
Definition: MVP is a derivation of the MVC (Model View Controller example) architectural pattern. It is used for building user interfaces.
In general, the MVP pattern allows separating the presentation layer from the logic. It means that everything from how the interface works to how it represents on the screen. MVP is a user interface architectural pattern, which eases automated unit testing and it is responsible to provide clean code. An MVP is a derivative of the known MVC.
- It represents the layer, which holds the business logic as well as controls how data is created, stored and modified. In Android, it is a data access layer, for example, database API or Remote server API.
- The Model consists of components that are responsible for functionalities like for generating, storing, exposing and fetching the data.
- All these functionalities usually perform in the background thread. Because, these functionalities could be time-consuming, and they can potentially block the main thread UI.
- It is a passive interface, which displays data, and the routes user actions to Presenter.
- In Android, the View is represented by Activity, Fragment or View.
- The View component contains a visual part of the application.
- The View contains the UI and it does not contain any logic or knowledge of the displayed data.
- The Presenter is in between Model and the View. And, it triggers the business logic, and lets to know ‘the View’ when to update.
- It recovers data received from the Model and shows it in the View.
- It interacts with the Model, then fetches and transforms the data from the Model to update the view.
Why Use MVP?
Numerous architectural patterns appeared, but MVP (Model View Presenter) can fulfill the complete requirements of Android developers.
MVP is one of the patterns, which the Android community prefers at this time.
In Android, the application should be easily extensible and maintainable. Therefore, in order to maintain the level, it is important to define separated layers well. And, MVP makes things easier for developers and it makes the views independent of the data source.
Difference Between MVP & MVC
Here are the key differences between MVC and MVP:
However, in order to separate interface from the logic is not at all easy in Android. MVP (Model – View – Presenter) makes it easier to avoid hurdles for android developers. In large android projects, it is pivotal to organize the code well. If it would not achieve, then it is impossible to maintain and extend.
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To close things up, MVP does a great job than MVC to breaking down your app in the modules.
In an MVP, when you build an app, which is based on an Android framework, then there is no need to create the ‘View’ constantly. The objective of MVP is to make views reusable.
As a conclusion, it is possible to say that MVP (Model – View – Presenter) is highly recommended for Android developers to build up an agile and scalable android application with minimal cost as compared to MVC.
So which pattern is the best suited for you? Share your thoughts with us.
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This page was last edited on July 1st, 2020, at 10:05.