Android Architecture Tutorial

This sample project shows use of different architecture patterns.

This is a weather application which displays information about:

• current weather

• 24 hour weather

• 5 day weather

  Application load information from server and store information locally.

  User is able to change the city.

  

At the begining, all logic is stored in MainActivity class.

General project transformation

Project improvements were divided into several steps:

• Step 1: Use MVC architecture to seperate business and presentation logic.

• Step 2: Use MVP to hide View from Presenter and increase testing capabilities.

• Step 3: Use Repository and Data Sources to manage local database and get data from remote server.

• Step 4: Implement Use Cases to move business logic out from Presenter.

• Step 5: Migrate to MVVM to support reactive components.

Step 1: Use MVC architecture to seperate business and presentation logic.

Source code is present at: https://github.com/TeslyukTaras/AndroidTutorial_Architecture/tree/mvc General Class diagram:

Step 2: Use MVP to hide View from Presenter and increase testing capabilities.

Source code is present at: https://github.com/TeslyukTaras/AndroidTutorial_Architecture/tree/mvp
General Class diagram:

Step 3: Use Repository and Data Sources to manage local database and get data from remote server.

Source code is present at: https://github.com/TeslyukTaras/AndroidTutorial_Architecture/tree/mvp_repository_datasource Key point is to divide Model into several parts:

• Repository, which manage Data Sources and take decisions which one to use.

• Local data source, which work with local DB.

• Remote data source, which work with remote server.

  

General Class diagram will transform to:

Step 4: Implement Use Cases to move business logic out from Presenter.

Source code is present at: https://github.com/TeslyukTaras/AndroidTutorial_Architecture/tree/mvp_clean_architecture Key point is to move business logic to separate classes:

• Use Case to load weather data.

• Use Case to find current weather.

• Use Case to filter 24hour weather.

• Use Case to find 5 day weather.

  

General Class diagram will transform to:

Step 5: Migrate to MVVM to support reactive components.

Source code is present at: https://github.com/TeslyukTaras/AndroidTutorial_Architecture/tree/mvvm

What is next:

- Save information about selected Cities.

- Improve MVVM sample to use DataBinding from JetPack.

- Integrate Dagger2.

Results

Let's compare different architectures and extensions by the next criterias:

• Class count

  

• Lines of code