Mobile MAUI if the server is not available #6714

3 Answer(s)

• 

  0

  Anjali_Musmade created 2 months ago

  Support Team Support Team Member

  Hello ,

  To enable offline functionality, it's essential to utilize an SQLite database to store data. When the application is online, this data should be synced with the SQLite database. In instances where the network isn't available, operations should rely on the data stored in SQLite. Additionally, an event should be implemented to trigger data updates whenever the network connection is established.

  We will try to provide ready solution for this but currently there is no plan for this.

  Thank you.

  Save Cancel
• 

  0

  lszabados@consult2000.hu created 2 months ago

  Hello,

  I don't want to implement offline operation, but I want the application not to quit if the server is not available, but to say "Server not available". In addition, in this state it should be possible to edit the server address, which is now contained in appsettings.json.

  For an installed Android application, I think this is essential.

  Regards,

  Save Cancel
• 

  0

  enisn created 2 months ago

  Support Team .NET Developer

  Hi, AbpApplication can't be initialized without retrieving application-configuration. So, it's not possible to initialize the same application without application configuration. Here are 2 ways to go:

  1 ) You can cache application-configuration once it's retrieved and read application-configuration from local storage if it's not available, and you have to implement offline cases on each page. It's tough and complex way.

  ---

  2 ) You can handle it if the backend isn't reachable and show the error page. (In that way application can't be opened without restarting when backend is available again)

  Here the steps to show error in your application:

  • Go to MauiProgram.cs, find the following code block and remove it

  app.Services.GetRequiredService<IAbpApplicationWithExternalServiceProvider>().Initialize(app.Services);
  

  • Go to App.xaml.cs and initialize it in here and show an error page when it can't be initialized. Change the MainPage = serviceProvider.GetRequiredService<AppShell>() section in theconstructor with the following pattern:

   try
   {
       serviceProvider.GetRequiredService<IAbpApplicationWithExternalServiceProvider>().Initialize(serviceProvider);
       
       // Regular scenario, everything is fine:
       MainPage = serviceProvider.GetRequiredService<AppShell>();
   }
   catch (Exception ex)
   {
       MainPage = new ContentPage {  Content = new Label { Text = ex.Message } };
  
       // Log the exception with your tracking tool, AppCenter, Sentry, etc.
       // Crashes.TrackError(exception);
   }
  

  Save Cancel