Android MVP Architecture Sample (Kotlin + Retrofit) - Weather App
MVP Architecture is one of the most popular architecture to develop a maintanable and managable codebase. We are developing a sample
Weater Forecast Android App with
MVP Architecture using
Kotlin language and
Retrofit network calling library.
There is another repository for the same project in
MVVM Architecture. Check MVVM repository from here.
We will develop a weather forecast Android Application with MVP architecture. The UI will be as like as above screenshot. There is a
Spinner with some
City name. After selection a city user need to hit the
View Weather button. Then App will send request to Open Weather web API and show the weather information in the UI.
Open Weather API
We will use Open Weather Map API for collecting weather information. To get the real weather information of a city, you need to sign up and get your own
APP ID. Otherwise you can test the API with their sample
BASE URL and sample
APP ID without creating account.
Clone the project and open it using Android Studio. Then open your
local.properties file under
Gradle Scripts. You need to specify the
app_id in your
local.properties file. Store your API secret in plain string file or Kotlin file is very risky. For security purpose it's better store in local.properties file than plain string/Kotlin file.
Use Sample API without creating account
Add below lines at the end of your
local.properties file. Then run the project. You'll get dummy or static API response from Open Weather API.
#this is sample Base URL base_url=https://samples.openweathermap.org/data/2.5/ #this is sample App ID of Open Weather API app_id=b6907d289e10d714a6e88b30761fae22
Use Real APP ID after sign up and activation of your APP ID
After Sign up at the website collect your own
APP ID from their API Keys page. Then add below lines with your APP ID at the end of
#this is real Base URL base_url=http://api.openweathermap.org/data/2.5/ #this is real App ID of Open Weather API app_id=YOUR_OWN_APP_ID
The BASE URL and APP ID will be fetched from
build.gradle file and will be stored it in
Retrofit API call will use the BASE URL and APP ID from
Note: The free version of Open Weather API allows maximum 60 API calls per minute.
Run the project
Gradle and run the project. Install APK on your emulator or real device. Turn on the internet of your testing device. For better understanding, please read the comments of every methods. Hope, these comments will help you to feel the
There are some other ways of implementation of
MVP. There are some arguments about the responsibilities of
model. After understanding the basic part of
MVP Architecture you can test them one by one. For simplicity, I've ignored
dependency injection in this project. I will create another repository of
MVP with dependency injection