On Feb 21, 2012, at 11:56 AM, Goncalo Oliveira wrote:
> I have the need to do something like this
>
> public class MyActivity : CrazyActivity
>
> Though, CrazyActivity is in a java library. Is there any way of doing this?
Yes, there is a way to do this, but it requires some "glue" code:
Java example:
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/Adder.java#L3
C# binding example:
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/ManagedAdder.cs#L6
Assuming that CrazyActivity didn't add any methods you wanted to invoke or
override, binding it is fairly easy:
[Register ("the/package/of/CrazyActivity", DoNotGenerateAcw=true)]
class CrazyActivity : Android.App.Activity /* assuming Activity is the
relevant base class */ {
// ...
}
If you do need to invoke methods and override virtual methods, see the above
SanityTests sample, and feel free to ask additional questions. We have a
work-in-progress JNI document describing how all this works; if you're going to
do lots of binding, we could provide you early access to it.
If instances of CrazyActivity will be created in Java and "surfaced"/exposed to
managed code, you'll also need to do two things:
1. Provide an (IntPtr, JniHandleOwnership) constructor:
public CrazyActivity(IntPtr handle, Android.Runtime.JniHandleOwnership
transfer)
: base (handle, transfer)
{
}
2. Provide a type mapping between the Java type and the managed wrapper:
Android.Runtime.TypeManager.RegisterType
("the/package/of/CrazyActivity", typeof (CrazyActivity));
The TypeManager.RegisterType() call should be performed before the Java
instance is surfaced in managed code, e.g. in your app's static constructor.
Thanks,
- Jon
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