xamarin-forms | Samples for Xamarin.Forms | Form library

I have a hard time understanding the difference between those 3 things when creating a project using Xamarin.Forms or MAUI. I know what these are - INotifyPropertyChanged is an interface you need to implement when you want to use bindings in XAML, BindableObject is Xamarin.Forms class that implements said interface and ObservableObject is a class found in Xamarin Community Toolkit that also implements that interface. I just don't really understand the differences between them (especially the latter two) and when you would use any of them? I have read different tutorials and they all say different things - that you need to implement the interface yourself (so your viewmodel implements it), that your viewmodel needs to inherit from BindableObject, or - if you're using Xamarin Community Toolkit (which you probably should use/are using) - inherit from ObservableObject. But - like I said - why should you use any of the solutions mentioned above over the others?

If you implement INotifyPropertyChanged interface Visual Studio (or ReSharper extension, I'm not sure which one) automatically implements the method it needs to and adds this code:

I am trying to implement barcode scanning in my Xamarin form, but no success.
I am able to get the camera working, but I don't see the red line on the screen and it simply refuses to scan anything

I tried this answer. I can see thru my camera, but no red line appears. But I can put the torch on and off

XAML code:

My Xamarin.Forms app is using Shell flyouts for navigation. When I navigate the app on iOS, I notice a strange behaviour. Reproduction steps:

1. Go to a page that has an Entry in it
2. Type anything into the Entry
3. Go to another page
4. Return to the same page you typed something into the Entry

The keyboard then pops up and then disappears right after. I can see the cursor in the Entry appear then disappear too. I removed a lot of my code to try to find the problem, but I can not find it. My code:

AppShell.xaml:

I have a Entry control inside DataTemplate of Bindable StackLayout. I have implemented TextChanged event of Entry control with Behavior but event is not getting fired.

This is xaml code

According to doc,

Xamarin.Forms uses a system font defined by each platform.

My app uses label to display text which contains special characters like: ∫, Δ, θ, ∠,...

I've tested on my device and saw that the special characters are rendered properly, but I can't predict what will happen when these special characters not available on other devices, e.g assume one of my users has an Android device that can't render the character "∫", when the label tries to render the text "Ha Ha ∫!!!", what will happen: A. It will display "Ha Ha ?!!!" or B. It will crash the app?

I'm afraid that case B may happens, so if it does, I may consider to use pronounce instead of symbol (e.g "integral" instead of "∫") to play it safe. If the worst scenario is case A, then I'll use the symbol to make it easy to understand for the user.

I want to implement Password autofill functionality for my Xamarin app, i followed the steps on https://mikalaidaronin.info/blog/posts/xamarin-forms-password-autofill and it is working fine for Android, but it is not working for iOS, i do not see password save popup for my iOS app.

Is there any additional step needed apart from the mentioned on the blog above?

I have been facing an issue many have been in the past but none of the solutions seem to work.

I have a Grid with in it a StackLayout with TapGesture.

I have Visual Studio 2019 installed with Xamarin. I'm trying to get Shell to show up in the project templates. I'm following this post as a guide. But when I install the vsix file, it fails with the error message: Installation of Microsoft.VisualStudio.Android.DeviceManager failed. The extension has a lower version than required by Visual Studio. Please install the extension from Visual Studio Installer instead.

Where in the Visual Studio Installer is the Android Device Manager? I've installed all the Mobile Development tools and all updates....

I found and tried one example of a custom rendered DatePicker, for Android, for Xamarin Forms and does not show which button was clicked in UnFocus. At least not for me. Its from stackoverflow. Xamarin.Forms Android DatePicker/TimePicker button listener

Has the example in this article helped anyone else? I really need to know when the OK button is clicked.