Recently I was working on a simple Android app. The app is about helping people to learn how to use MVP pattern. The MVP pattern is a design pattern that I came across few years ago and I really love it. I have used it so many times in my life. It has really helped me to design more complex apps without any problems. The pattern focuses on a single responsibility and is focused on the interface, not the implementation.
Recently, we have been very busy to make the Android library which is able to help you to develop the MVP pattern for Android app. In this library, we use the support library for MVP pattern. Before I go into the details of this library, let me tell you the reason I make this library.
We all know MVP is a good pattern to use for creating an MVP when you make an Android App. But what if we can use the pattern when we do the MVP for the project? It would make things much easier.
Moxy
Moxy is a library that allows you to use the MVP model when creating an Android application. No life cycle issues and no model code!
The basic idea behind using Moxy :
Check out the wiki here to see what’s going on.
Capacity
Moxy has exceptional features in other respects as well:
- The presenter remains alive when the activity is recreated (which simplifies multithreading).
- Automatically restore everything the user sees when restarting an activity (including adding dynamic content)
- Ability to change multiple views of a single presenter
Reason
See the surface
public interface HelloWorldView extends MvpView {
void showMessage(int message);
}
Presenter
@InjectViewState
public class HelloWorldPresenter extends MvpPresenter {
public HelloWorldPresenter() {
getViewState().showMessage(R.string.hello_world);
}
}
Display the performance
public class HelloWorldActivity extends MvpAppCompatActivity implements HelloWorldView {
@InjectPresenter
HelloWorldPresenter mHelloWorldPresenter ;
private TextView mHelloWorldTextView ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hello_world) ;
mHelloWorldTextView = ((TextView) findViewById(R.id.activity_hello_world_text_view_message));
}
@Override
public void showMessage(int message) {
mHelloWorldTextView.setText(message);
}
}
You can see an example of a Github application here.
Wiki
You can find all the information in the Moxy Wiki
Android Studio models
To avoid creating template code to link the activity, snippets and their presentation part, we recommend using Android Studio templates for Moxy.
Templates in the /moxy-templates directory
References
Telegraph traffic (en)
Telegraph traffic (ru)
References
FAQ
Integration
Integration of basic modules :
Dependencies {
…
compile com.arello-mobile:moxy:1.5.5
annotationProcessor com.arello-mobile:moxy-compiler:1.5.5
}
Add the following for the additional base view classes MvpActivity and MvpFragment:
Dependencies {
…
compile ‘com.arello-mobile:moxy-android:1.5.5’
}
If you plan to use AppCompat, you can use MvpAppCompatActivity and MvpAppCompatFragment. Then add the following:
Dependencies {
…
compile ‘com.arello-mobile:moxy-app-compat:1.5.5’
compile ‘com.android.support:appcompat-v7:$support_version’
}
AndroidX module integration
If you are using AndroidX, use MvpAppCompatActivity and MvpAppCompatFragment add this (thanks to @jordan1997):
Implementation of ‘tech.schoolhelper:moxy-x-androidx:1.7.0’.
AndroidX (Google Material) module integration
If you are using Google Material, add the MvpBottomSheetDialogFragment (thanks to @jordan1997) :
Implementation of ‘tech.schoolhelper:moxy-x-material:1.7.0’.
Note: @jordan1997 has made a fork of Moxy – you are free to use that fully (rather than just using a dependency on that module) at your discretion.
Kotlin
If you are using kotlin, use kapt instead of the supplied dependency type/apt :
Apply the plugin : ‘kotlin-capt’.
Dependencies {
…
captures com.arello-mobile:moxy-compiler:1.5.5
}
ProGuard
Moxie is completely thoughtless! No special ProGuard rules are required.
GitHub
https://github.com/Arello-Mobile/MoxyI have been working on this library recently (a little bit). It is not fully complete and is still under development. The main intention of the library is to help all people who use MVP pattern in android app development.. Read more about android mvp recyclerview tutorial and let us know what you think.
Frequently Asked Questions
What is MVP pattern in Android?
What is MVP pattern? To understand what MVP pattern is, it is important to understand MVP itself. The MVP pattern is a design pattern that helps to use the single responsibility principle in any software design. The main idea of the pattern is the separation of the model (domain) and the view (presentation). The MVP pattern divides the whole application into two parts. The model is responsible for the whole state of the application. The view is responsible for rendering the data and the UI. In this post we will get a clear idea about the MVP pattern and how it is applicable for Android development. We will start by discussing the basic concepts, its components and then it comes up the Android application development with MVP pattern.
Why do we use MVP in Android?
The MVP pattern is one of the key patterns of object oriented programming. The basic idea is that the class or other component should encapsulate all its data and its behavior. This is a great idea when there is only one class or component in the application, but most of the time we want to have multiple components in our application. This is where the MVP pattern comes in. With the MVP pattern, we are able to divide every functionality of the application into separate components. We can then attach a new component into our application without affecting any other components. There’s a lot of confusion about MVP (Model View Presenter) pattern. But what is MVP? It is basically a pattern that we can use in any type of project. It is also an architecture pattern that helps to do separation of concern. But why do we use MVP in Android? MVP pattern helps us to develop the MVP (Model View Presenter) in android project. And what does MVP pattern help in? MVP pattern helps to develop the MVP (Model View Presenter) in android project.
How do I use MVP on Android?
Android is one of the most widespread mobile operating systems available. It has the largest number of apps ever achieved by any mobile operating system. However, creating a mobile app for Android can be very challenging due to the lack of certain tools that will surely help you test and develop your app. MVP pattern is one of those tools that will ease the process of creating an Android app. Android is a pretty open platform, so it’s easy to see how it’s possible to write Android apps in a fast and easy manner. But, what’s the deal with MVP pattern? If you’ve never heard of MVP, it’s basically an alternative pattern to the classic MVC which helps to build Android apps in a much easier manner. When you create a new MVP project, you’ll directly see the Model, View, and Presenter objects, which you need to define and configure.
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