Project Architecture

## Note : 
We will use MVP as default architecture cause it's easy to implement comparing to MVVM.
Instead we will implement some features with MVVM architecture.

## Why we need an Architecture ?
1. The Android API is tightly coupled.
2. Make the app easy to test (the must important part).
3. Make the app modular.
4. Make app change/fix easy.

## The Model-View-Presenter Pattern :
* Model — the data layer.
* View — the UI layer
* Presenter — fetch the data from the Model and handle the View state. 

In practice :
* Model — The Model works with the remote and local data sources to get and save the data.
`List<Agency> agencies;`
* View :
`public interface AgencyMvpView extends BaseView {
  void onAgencySendResult(Boolean result, int code, AgencyResponse agencyResponse);
  void loadMarkers(Boolean result, int code, AgencyResponse agencyResponse);
  void loadCities();
}`
* Presenter :
`public class AgencyPresenter implements BasePresenter<AgencyMvpView> {
  private AgencyMvpView agencyMvpView;
  private Subscription subscription;
  ...
}`