Simple Weather App

MainActivity

Main activity responsible for managing the UI and navigation.

onCreate()

• Initializes the activity when created.
  • Sets content view to "activity_main" layout.
  • Replaces the root view with CitiesFragment.

gotoDetails(City city)

• Callback method triggered when a city is selected.
  • Replaces the root view with WeatherForecastFragment for the selected city.
  • Adds the transaction to the back stack for navigation purposes.

CitiesFragment

Fragment responsible for displaying a list of cities and fetching data from an API.

onCreateView()

• Inflates the layout for the fragment.

onViewCreated()

• Sets up the ListView and ArrayAdapter.
• Defines onItemClick listener for ListView items.
• Calls getCities() to start fetching data.

getCities()

• Makes an HTTP GET request to retrieve a list of cities from the API.
• Parses the JSON response and populates the cities ArrayList.
• Notifies the adapter of dataset changes on the UI thread.

onAttach()

• Attaches the fragment to the context to communicate with the MainActivity.

CitiesFragmentListener

• Interface for communicating with the MainActivity to replace the current fragment with WeatherForecastFragment on item click in the ListView.

WeatherForecastFragment

Fragment responsible for displaying weather forecasts for a specific city.

newInstance(City city)

• Static method to create a new instance of WeatherForecastFragment with a given city.
• Sets the city as an argument to pass to the fragment.

onCreate()

• Initializes the fragment.
• Retrieves the city object passed as an argument.

onCreateView()

• Inflates the layout for the fragment.

onViewCreated()

• Displays the city name.
• Calls getWeatherApi() to fetch weather data.
• Sets up the RecyclerView and adapter for displaying weather forecasts.

getWeatherApi()

• Makes an HTTP GET request to retrieve weather data from the Weather API.
• Parses the JSON response to extract the forecast URL.
• Calls getForecastApi() with the forecast URL.

getForecastApi(String forecastURL)

• Makes an HTTP GET request to retrieve forecast data from the forecast URL.
• Parses the JSON response to extract forecast details.
• Updates the RecyclerView adapter with the forecast data.

WeatherForecastAdapter

• Inner class RecyclerView adapter for displaying weather forecasts.

onCreateViewHolder()

• Inflates the layout for forecast list items.

onBindViewHolder()

• Binds forecast data to the ViewHolder.

getItemCount()

• Returns the number of forecast items.

WeatherViewHolder

• Inner class representing ViewHolder for weather forecast items.

setupUI()

• Sets up the UI elements with forecast data.

City Class

Model class representing a city.

Constructors

Model class representing a cities, states, latitude and longitude.

• City(): Default constructor.
• City(String name, String state, double lat, double lng): Constructor with parameters.
• City(JSONObject jsonObject) throws JSONException: Constructor that parses a JSON object to initialize city data.

Forecast

Model class representing a weather forecast.

Constructors

• Forecast(): Default constructor.
• Forecast(JSONObject jsonObject) throws JSONException: Constructor that parses a JSON object to initialize forecast data.

ALL APIs Tested Using Postman