Xamarin.Android: How to capture Button events defined in the OnClick XML attribute?

Question

I have this Button inside a RelativeLayout which is included as part of a custom ListView row Layout.

Answer 1

Add the attribute [Java.Interop.Export] to your click handler method:

[Java.Interop.Export("myClickHandler")] // The value found in android:onClick attribute.
public void myClickHandler(View v) // Does not need to match value in above attribute.
{
    Console.WriteLine ((v as Button).Text);
}

This will expose the method to Java via the Generated Callable Wrapper for your activity so it can invoked from the Java runtime.

See:

1. Mono For Android 4.2 release notes within the section titled "Exporting arbitrary Java member for better Java integration".

Important Note

Using [Java.Interop.Export] requires you to add the Mono.Android.Export assembly to your project.

Therefore this feature is only available for Indie and higher licences.