In this tutorial you will learn how to add a ListView in your Android app using Xamarin. ListView elements allow you to create a scrollable list where each list item can have a click event. A ListView looks like this…
In this tutorial, we will create the ListView and then we will make each item in the list ‘clickable’ in the next tutorial.
To get started, create a new solution in Xamarin (File > New Solution). Choose the Android App template and click Next.
Give your app a name and select Modern Development as the target platform. Click Next.
Confirm the project and solution name and the project folder location. Click Create.
Open the Main.axml file in the Resources / layout folder. Delete the default button on the screen.
Drag a ListView element on to your screen from the Toolbox. You won’t necessarily see anything on the screen after dragging the ListView on to the screen, so we will look at the code for the Main.axml file in the next step.
Click on the Source tab to view the code for the Main.axml file. Delete the two lines of code that specify the minimum width and height for the ListView element. Then make sure that the layout_width and layout_height properties for the ListView element are both set to “match_parent”.
Change the name of the ListView to myListView as show below.
Open the MainActivity.cs file. Delete the lines of code highlighted below. They won’t be needed for this program.
Add the following line of code highlighted below to the top section of your code.
We need to create a new List that will contain a list of items of the string data type. It can be called myListItems. We also need to add the ListView to the code called myListView. To do this, add the following two highlighted lines of code in the MainActivity class.
Add the following highlighted line of code inside the OnCreate method so that you can access the ListView item (that you added to the Main.axml screen) in your MainActivity.cs code.
Now you can start adding items to the list called myListItems. Firstly, you need to setup the list (as shown on line 23 below) and then you can add string items to the list. For example, this app will contain a list of cities in Australia. Add the following highlighted lines of code.
In Android development, whenever we want to show a vertical list of scrollable items on a screen we need to use a ListView as we have done. Data in the ListView is populated using an Adapter. The simplest type of adapter we can use is called the ArrayAdapter. The ArrayAdapter will convert an ArrayList of objects into View items that are loaded into the ListView container. This is exactly what we will do here. Copy the two highlighted lines of code below to convert your Arraylist into View items that will be displayed in the ListView in your app.
That’s it! Now test your app using a suitable virtual Android device (eg. Nexus 5 API 19). In the next tutorial we will add click events for the list items.
Next tutorial: Add click events to a ListView in an Android app