Simple architectural patterns for simple android app

#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP UPDATE#
#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP FOR ANDROID#
#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP SOFTWARE#

Too often, the controller responsibilities are also found in activities and fragments.

#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP UPDATE#

The controller will also update the view when the model changes. The controller updates the model when something happens in the view.

Controllers: Controllers are a way to connect models and views together.

In Android, the view responsibility often falls onto activities and fragments. As such, the view tends to be a lightweight component compared to a controller and typically doesnвЂ™t contain much code. A view should only be responsible for displaying things and should not contain any business logic. They also handle any interaction a user may have with the screen - click listeners, for example.

Views: Views are whatвЂ™s displayed to the user.

Then the data is put into small, simple classes which the other components can use. Usually, this data is fetched from the network or a local database. Models: Models contain the displayed data.MVC: The Traditional ApproachДЄ traditionally written Android app is made up of three main components.

#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP SOFTWARE#

But youвЂ™re not here for a tutorial on UI, youвЂ™re here about architecture! First, youвЂ™ll explore what is considered the traditional approach to software architecture for many systems. Then, you check to see if the rain value is a positive one, and then you display the umbrella image or the sun image. When the view finishes loading, you fetch the weather data.

#SIMPLE ARCHITECTURAL PATTERNS FOR SIMPLE ANDROID APP FOR ANDROID#

To keep this tutorial simple, there is a class named WeatherRepositoryImpl, which inflates a model object named Weather from a JSON payload using Moshi a JSON library for Android and Java, which makes it easy to parse JSON into Java objects. In a production app, you would fetch this data with a networking library such as Retrofit. The weather data comes from the OpenWeatherMap API. Familiarize yourself with the starter project code, which uses a structure as illustrated in the following diagram: Most of the logic is in a single class - MainActivity.kt. Nice right? :] If you tap the Load Weather button, the app will randomly change the weather between sunny and raining. Open the starter project in Android Studio 3.2.1 or greater, then build and run to see the app youвЂ™ll be working with. Getting StartedДownload and unzip the materials for this tutorial using the Download Materials button at the top or bottom of this page. You will also learn how the refactored components of the app can be tested. The important thing here is, you will refactor an initial version of this app, so that it leverages the use of the model вЂ“ view вЂ“ presenter pattern. In this tutorial, you will build an app named Umbrella which will show an umbrella icon when thereвЂ™s rain in the forecast, and a sun icon when itвЂ™s going to be nice and sunny outside. You will also learn how this pattern fits within the Android ecosystem.

Picking an architecture for Android can be tricky, however in this tutorial, you will look at one way to achieve a clean codebase using MVP, short for ModelвЂ“ ViewвЂ“ Presenter. A well organized codebase is easy to maintain, is robust, performs well, is testable and is self-documenting. A clean codebase is always a pleasure to work with.

Simple architectural patterns for simple android app