App backup / synchronization between devices Apps usually backup their content to the respective cloud to ensure local data isn’t lost, but there is of course no guarantee the user has activated those features. When working with Xamarin/Forms your app is available on more then one device, so you might want to sync files between the OS:s too – like an SQLite database for example. Complete Code for this tutorial DropboxService.cs GIST Dropbox v2 API SDK […]
Xamarin is a cross platform framework for developing all device mobile apps using C# and Visual Studio (PC) or Xamarin Studio (Mac)
Background Working with Xamarin.Android (or Xamarin.Forms with Android) you might encounter this error when making HTTP/REST calls to an API, even if you think your making the call async. So what’s up with that? The Culprit What can commonly happen is you got some nested async call like this (simplified):
public async Task<TokenResponse> Login(string username, string password)
this.TokenResponse = await this.Authenticate(username, password);
While Login will begin to execute async and the nested call to Authenticate (signature async Task<TokenResponse>) will also do so the assignment to this.TokenResponse (a […]
Here’s a simplified description of the Xamarin framework and tips on how to resolve those platform specific exceptions.
Here’s some basic tips to get your app running smoothly: Enable new Garbage Collector Add a text file to your Android project with build action Android Environment and set params. Here’s an example for using the tarjan GC:
# Comments are lines which start with '#'
# Blank lines are ignored.
# Use new Garbage Collector
# Enable GREF messages to `adb logcat`
# Use new client handler
# Clear out a Mono environment variable to decrease logging
Source: https://blog.xamarin.com/xamarin-android-garbage-collection-improvements/ https://developer.xamarin.com/guides/android/advanced_topics/garbage_collection/#GC_Bridge_Options Java.lang.OutOfMemoryError If you’re getting these it means you haven’t allocated enough memory to Java. To do this, check your Android project’s properties and set Java Max Heap Size to “1G”. Do this […]
You may receive tricky Cryptography errors from Android / Java
It can be challenging to get all the pieces together for Xamarin (Forms) to work. Here’s some guidance on how to get past those first hurdles. Install Xamarin for Visual Studio From Visual Studio 2015 Xamarin is included with the installer under Cross-Platform, but you can always use the standalone installer from Xamarin’s web site. Follow the steps of the installer to get going. This will add “Xamarin Visual Studio” integration and project / file […]