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Open the downloaded project in Android Studio.

Browse the project files in the Project tool window to see how the app is set-up.

Click the Run button to build and run the app.

Wait for Android Studio to open the project.

In the Import Project dialog, navigate to where the unzipped project folder is located (likely in your Downloads folder).

Note: If Android Studio is already open, instead, select the File > New > Import Project menu option.

In the Welcome to Android Studio window, click Open an existing Android Studio project.

This creates a new folder that contains the project files.

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Double-click the ZIP file to unpack it.

Locate the file on your computer (likely in the Downloads folder).

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In the dialog, click the Download ZIP button to save the project to your computer.

On the GitHub page for the project, click the Code button, which brings up a dialog.

This opens the GitHub page for the project in a browser. To get the code for this codelab and open it in Android Studio, do the following. Select this folder when you open the project in Android Studio. If you use the starter code from GitHub, note that the folder name is android-basics-kotlin-mars-photos-app. You will learn more about unfamiliar code in later codelabs. Starter code may contain code that is both familiar and unfamiliar to you from previous codelabs. This codelab provides starter code for you to extend with features taught in this codelab. To ensure that the data is correctly retrieved and parsed, you'll just print the number of photos received from the backend server in a text view: The version of the app you build in this codelab won't have a lot of visual flash: it focuses on the networking layer part of the app to connect to the internet and download the raw property data using a web service. This screenshot is shown in this codelab to give you a better idea of the overall app functioning. Note: The above screenshot is the screenshot of the final app that you will build at the end of the pathway that is at the end of the next codelab. Following is the screenshot of the final app, which contains a grid of thumbnail property images, built with a RecyclerView. The images are real-life photos from Mars captured from NASA's Mars rovers. This app connects to a web service to retrieve and display the Mars photos. In this pathway, you work with a starter app called MarsPhotos, which shows images of Mars surface.

A computer with Android Studio installed.

Use Retrofit's support for coroutines to simplify the code.

Parse the JSON response from the web service into your app's LiveData objects with the Moshi library.

Implement a network layer for your app using the Retrofit library.

Modify a starter app to make a web service API request and handle the response.

Using the Moshi library to parse the JSON response into a data object.

Using the Retrofit library to connect to a REST web service on the internet and get a response.

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How to add dependencies in a gradle file.

How to use Android architecture components ViewModel, and LiveData.

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You will also update the app's user interface if the internet is slow or unavailable this will keep the user informed about any network connectivity issues. This greatly simplifies fetching the data, and also helps the app conform to Android best practices, such as performing the operations on a background thread. In this codelab, you use open source developed libraries to build the network layer and get data from a backend server. Gmail, YouTube, and Google Photos are some example apps that connect to the internet to display the user data. Such as retrieving emails, messages or similar information from a backend server. Most of the Android apps in the market connect to the Internet to perform some network operations.