Being lucky to develop a backend and a Xamarin.Forms clients on your own? Sooner or later you will have to debug the API calls and it might become painful. Unless, you will follow the next rules:
- Configure your API URL to run on 127.0.0.1 instead of a localhost:
// .NET Core Web.Api example
public static IWebHost BuildWebHost(string args) =>
- Configure your Xamarin.Forms API consumer to have a conditional URL base:
string apiUrl = null;
if (Device.RuntimePlatform == Device.Android)
apiUrl = “http://10.0.2.2:5001/api“;
else if (Device.RuntimePlatform == Device.iOS)
apiUrl = “http://localhost:5001/api“;
throw new UnsupportedPlatformException();
The problem with Android emulator is that it maps 10.0.2.2 to 127.0.0.1, not to localhost. However, the iOS Simulator uses the host machine network.
That should be it!
Many years ago when I was at high school, I wrote a bot for a web browser flags quiz game, where a flag of a random country and 4 different country names where shown to the player. It was fun!
So I created the same game for iOS and Android using Xamarin.Forms just for fun. It is open source and available on github:
This is what you get when an engineer creating a game without a designer. Luckily you can contribute if you have an idea on how to improve the UI/UX or if you want to add new features. I had a couple of them in my head:
- Learning game mode (without time or a game over)
- [X] game mode – where the flag image is covered by some objects that the player has to remove and/or etc.
If you are new to Xamarin.Forms or MVVM I would recommend to check the source code, it is touching the next interesting topics:
- ViewModel first navigation
- Custom fonts
Otherwise you are free to use the source code as you wish since it is under MIT license.
Recently I updated my macOS to High Sierra however this broke my android emulators. Non of them started and logs showed something like:
Failed to open vm 3
Failed to create HAX VM
No accelerator found.
failed to initialize HAX: Invalid argument
As the logs states there is a problem with HAXM, and to be more specific a time for update has come. To solve the issue simply download the latest and greatest version of HAXM and restart your mac.
Picker is a very common UI control. In order to capture user input we have to listen to ‘SelectedIndexChanged’ event, which unfortunately behaves differently on Android and iOS:
On iOS ‘SelectedIndexChanged’ is triggered every-time user moves / scrolls the list. ‘Done’ button is there only for hiding the list. However, on Android ‘SelectedIndexChanged’ event will be triggered only once, after user selects an item. This is because on Android the list is displayed as a popup which disappears right after user input.
That may sound as a minor problem, unless you have to do some heavy work on the UI on each ‘SelectedIndexChanged’. Luckily, since Xamarin.Forms 2.3.4 it is possible to set the expected behaviour on the Picker control:
var picker = new Picker();
Alternatively we can do the same thing in XAML.
We have to define a new namespace:
And consume it the next way:
<Picker ios:Picker.UpdateMode=”WhenFinished” .. />
Easy as it is! So there is no need to write workarounds anymore.
P.S.: Additional information can be found here.