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Android in Action: Implement MVP(Model - View - Presenter) Architecture for Android Application. Past 1: Analysis the requirement

Overview

Let''s discuss the way implementation Android MVP Architecture in practical case.

  1. Part1: Overview MVP Architecture and Login function''s requirement
  2. Part 2: Implement source code by Kotlin in Android Application

We''ll design MVP Architecture like as below

  1. View layer:
    • UI :display data -> configure activity/fragment layout, binding data, binding action -> with context of application
    • The adapter: transformation data if necessary (usually using with recycle view,...)
  2. Model layer:
    • network and DAO: handle the way how to get/load data (from cache, from REST API,...)
    • entity: just informations which functions need. (It can be store in Room database,...)
  3. Presenter layer:
    • presenter: extend ViewModel()/AndroidViewModel()
      • kepp data variable of layout for binding data
      • has state -> decides the View's behavior (implement by LiveData)
      • keep entity references to hold data for View
      • keep DAO/network references to get/load data
      • optional: keep/refer other business/validate references for owner business
    • other business, validate,...

Requirement:

User want to build a function called Login. It has:

  • GUI: display data and keep interacting with user.
  • data: store user's data to use for login business.
  • login manual: main business.
  • single sign on: auto login when user has author before.
  • validate: validate data.
  • show message: info and error messages.

Let's analysis user's business

we have a Login function specs as below:

  1. Display screen
  2. sso (auto login) by cache
    • sso -> false: user must to login manually
    • sso -> true: auto redirect to home screen
  3. Login manual
    • handle user's input: both (username, passwork)are fill -> enable login button, else disable
    • validate: (disable login button when user's input invalid else enable.)
      • username is not empty
      • username's length is between 6-8 characters
      • password is not empty
      • password's length is between 6-10 characters
      • both username and password can not contains space character
    • login action
      • call RESTfull API to execute login with params: username, password by JSON format
      • Success:
        • Update cache login state for login next time
        • Redirect home screen
      • False: show error from server

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