I am using following code from here.
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread paramThread, Throwable paramThrowable) {
// Catch your exception
// Without System.exit() this will not work.
System.exit(2);
}
});
I want to use this in C#. But, I could not find equivalent methods to this approach in C#. I want to use Toast.makeText()
to show the error to user.
The below post is complete
Just in android platform you need to add "AndroidEnvironment.UnhandledExceptionRaiser" event to it
AndroidEnvironment.UnhandledExceptionRaiser += OnAndroidEnvironmentUnhandledExceptionRaiser;
private void OnAndroidEnvironmentUnhandledExceptionRaiser(object sender, RaiseThrowableEventArgs unhandledExceptionEventArgs)
{
var newExc = new Exception("OnAndroidEnvironmentUnhandledExceptionRaiser", unhandledExceptionEventArgs.Exception);
LogUnhandledException(newExc);
}
try something like this -
AppDomain.CurrentDomain.UnhandledException += <Put your own delegate or handler>;
TaskScheduler.UnobservedTaskException += <Put your own delegate or handler here>;
Ideally, you would like to do this in someplace which is executed not more than once during the execution of your program. In case of a Xamarin.Android App, you can put this in the Custom Application class onCreate
method.
If you want a code sample, check this link (I have not run the code myself, so can't guarantee the correctness of it. Use it just as a reference) - Sample
// In MainActivity
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;
Xamarin.Forms.Forms.Init(this, bundle);
DisplayCrashReport();
var app = new App();
LoadApplication(app);
}
#region Error handling
private static void TaskSchedulerOnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs unobservedTaskExceptionEventArgs)
{
var newExc = new Exception("TaskSchedulerOnUnobservedTaskException", unobservedTaskExceptionEventArgs.Exception);
LogUnhandledException(newExc);
}
private static void CurrentDomainOnUnhandledException(object sender, UnhandledExceptionEventArgs unhandledExceptionEventArgs)
{
var newExc = new Exception("CurrentDomainOnUnhandledException", unhandledExceptionEventArgs.ExceptionObject as Exception);
LogUnhandledException(newExc);
}
internal static void LogUnhandledException(Exception exception)
{
try
{
const string errorFileName = "Fatal.log";
var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal); // iOS: Environment.SpecialFolder.Resources
var errorFilePath = Path.Combine(libraryPath, errorFileName);
var errorMessage = String.Format("Time: {0}\r\nError: Unhandled Exception\r\n{1}",
DateTime.Now, exception.ToString());
File.WriteAllText(errorFilePath, errorMessage);
// Log to Android Device Logging.
Android.Util.Log.Error("Crash Report", errorMessage);
}
catch
{
// just suppress any error logging exceptions
}
}
/// <summary>
// If there is an unhandled exception, the exception information is diplayed
// on screen the next time the app is started (only in debug configuration)
/// </summary>
[Conditional("DEBUG")]
private void DisplayCrashReport()
{
const string errorFilename = "Fatal.log";
var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
var errorFilePath = Path.Combine(libraryPath, errorFilename);
if (!File.Exists(errorFilePath))
{
return;
}
var errorText = File.ReadAllText(errorFilePath);
new AlertDialog.Builder(this)
.SetPositiveButton("Clear", (sender, args) =>
{
File.Delete(errorFilePath);
})
.SetNegativeButton("Close", (sender, args) =>
{
// User pressed Close.
})
.SetMessage(errorText)
.SetTitle("Crash Report")
.Show();
}
#endregion
//iOS: Different than Android. Must be in FinishedLaunching, not in Main.
// In AppDelegate
public override bool FinishedLaunching(UIApplication uiApplication, NSDictionary options)
{
AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;
...
}
/// <summary>
// If there is an unhandled exception, the exception information is diplayed
// on screen the next time the app is started (only in debug configuration)
/// </summary>
[Conditional("DEBUG")]
private static void DisplayCrashReport()
{
const string errorFilename = "Fatal.log";
var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Resources);
var errorFilePath = Path.Combine(libraryPath, errorFilename);
if (!File.Exists(errorFilePath))
{
return;
}
var errorText = File.ReadAllText(errorFilePath);
var alertView = new UIAlertView("Crash Report", errorText, null, "Close", "Clear") { UserInteractionEnabled = true };
alertView.Clicked += (sender, args) =>
{
if (args.ButtonIndex != 0)
{
File.Delete(errorFilePath);
}
};
alertView.Show();
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With