Xamarin Project Structure

You can see on this image we have 3 type of project are there, C# myFirstApp, myFirstApp.Android, myFirstApp.iOS. Let’s discuss it one by one.

C# myFirstApp

In this project we write the common code used by all the platforms. We’ll be most interested in the MainPage.xaml and MainPage.xaml.cs files. You can already guess that the MainPage.xaml file will be used to position the controls in the layout, and MainPage.xaml.cs to handle these controls using C# .NET.

myFirstApp.Android

This is the highlighted 2nd project and this is responsible for Android project. Let’s discuss the folders of Android like below,

• Connected Services – Connected services such as databases and so on will be located here. We’ll get to this later in the course.
• Properties – There’s a very important file named AndroidManifest.xml. In this file, we set the minimum and target version of the API, the icon, and many other parameters of our application.
• Resources/ – Here we’ll place images for our application. Note the Drawable/ folders and their other variants. That’s because mobile devices, like computers, have different resolutions and sizes, so we’ll need to adjust the control layout and image resolutions to the size of each device’s screen. For example, for a full HD tablet, we use the highest image resolution. On the other hand, we use the smallest one for a small phone so that the application doesn’t take up too much memory and isn’t slow.
• MainActivity.cs – It’s a file containing the default activity used when the application is started. We’ll talk more about the activities below.