The “LinkAssemblies” task failed unexpectedly
Apparently, this is a known issue: Xamarin Forms needs the TargetAndroidVersion to be 21. (In the config GUI, this is entitled “Compile using Android version:”)
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Global Exception Handling in Xamarin Cross platform
There isn’t a ‘Xamarin.Forms’ way of doing it that I know of. You need to hook into Android and iOS, what you could do is create one method that handles them both in the same way. A nice post about this is by Peter Norman. He describes that to implement it in Android you can … Read more
Xamarin.Android Proguard – Unsupported class version number 52.0
You need to update the default Android SDK proguard.jar with the latest version of Proguard found here: https://sourceforge.net/projects/proguard/files/ I would recommend that you install this on the side of the default version that Android ships in android-sdk\tools\proguard. Simply rename the existing folder to something else and add the new version of proguard. This is listed … Read more
How to log in to Facebook in Xamarin.Forms
UPDATE (10/24/17): While this way of doing things was okay a few years ago, I now strongly advocate for using native UI for doing authentication, as opposed to the webview method shown here. Auth0 is a great way to accomplish native UI login for your apps, using a wide variety of identity providers: https://auth0.com/docs/quickstart/native/xamarin EDIT: … Read more
Get current screen width in xamarin forms
You can try this Application.Current.MainPage.Width in my case this worked and i am able to find the device width in portable project itself.
com.apple.AuthenticationServices.Authorization Error Code 1000
I got this error because forget to add sign in capability and restart the app.
Separators in Xamarin.Forms
You might try using BoxView // sl is a StackLayout sl.Children.Add(new BoxView() { Color = Color.Black, WidthRequest = 100, HeightRequest = 2 }); although in my test, the width request is not being followed. This may be a bug, or other settings might be interfering with it.
You need to add a reference to Mono.Android.Export.Dll when you use ExportAttribute or ExportFieldAttribute
I found the answer. Right click references and search Export. Just add the Mono.Android.Export to your project.
Xamarin Android – How to rebuild Resource.designer.cs
As recently as Xamarin Studio 5.6 (build 273) with Xamarin.Android 4.18.0, if you have manually deleted the Resource.designer.cs file from the project, rebuilding will regenerate Resource.designer.cs, but will not add it back into the project. So after attempting to rebuild once, the file will be present in the file system, but not in the project. … Read more
How can I save some user data locally on my Xamarin Forms app?
You have a couple options. SQLite. This option is cross-platform and works well if you have a lot of data. You get the added bonus of transaction support and async support as well. EDIT: In the past I suggested using SQLite.Net-PCL. Due to issues involving Android 7.0 support (and an apparent sunsetting of support) I … Read more