On Jan 19, 2012, at 4:58 PM, Mark Eaton wrote:
> Now I need to implement the call back based on a Java interface:
> "com/android/vending/licensing/LicenseCheckerCallback"
See the SanityTests sample:
Java:
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/Adder.java#L14
C# binding:
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/ManagedAdder.cs#L82
> // HOWEVER AM I IMPLEMENTING THE BELOW CODE CORRECTLY????
> // OR AM I WAY OFF TRACK??
You're partially off track. :-)
Your interface methods need to provide the Connector value, and methods don't
require DoNotGenerateAcw:
[Android.Runtime.Register("com/android/vending/licensing/LicenseCheckerCallback",
DoNotGenerateAcw = true)]
public interface ILicenseCheckerCallback : IJavaObject
{
[Register("allow", "()V",
"GetAllowHandler:Insert.Namespace.Here.ILicenseCheckerCallbackInvoker, AQN")]
void Allow ();
[Register("dontAlllow", "()V",
"GetDoNotAllowHandler:Insert.Namespace.Here.ILicenseCheckerCallbackInvoker,
AQN")]
void DoNotAllow ();
[Register("dontAlllow", "()V",
"GetApplicationErrorHandler:Insert.Namespace.Here.ILicenseCheckerCallbackInvoker,
AQN")]
void ApplicationError (ApplicationErrorCode errorCode);
}
"AQN" is the AssemblyQualifiedName for your assembly; see e.g.
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/ManagedAdder.cs#L84
Then you need to bind the ApplicationErrorCode type (it's a class), akin to:
[Register
("com/android/vending/licensing/LicenseCheckerCallback$ApplicationErrorCode",
DoNotGenerateAcw=true)]
public class ApplicationErrorCode : Java.Lang.Object {
/* ... */
// Note: this must provide the (IntPtr, JniHandleOwnership)
constructor
}
Finally you need the interface Invoker, the ILicenseCheckerCallbackInvoker
referenced above. The Invoker is responsible for implementing the interface (so
that a Managed Callable Wrapper can be created for Java instances of the
interface), and for providing the marshaling functions. For an example, see:
https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/ManagedAdder.cs#L88
class ILicenseCheckerCallbackInvoker : Java.Lang.Object,
ILicenseCheckerCallback {
// ...
#region ApplicationError
IntPtr id_applicationError;
public void ApplicationError (ApplicationErrorCode errorCode)
{
if (id_applicationError == IntPtr.Zero)
id_applicationError =
JNIEnv.GetMethodID(class_ref, "applicationError",
"(Lcom/android/vending/licensing/LicenseCheckerCallback$ApplicationErrorCode)V");
JNIEnv.CallVoidMethod(Handle, id_applicationError, new
JValue (errorCode));
}
#pragma warning disable 0169
static Delegate cb_applicationError;
static Delegate GetApplicationErrorHandler ()
{
if (cb_applicationError == null)
cb_applicationError =
JNINativeWrapper.CreateDelegate ((Action<IntPtr, IntPtr, IntPtr>)
n_ApplicationError);
return cb_applicationError;
}
static void n_ApplicationError (IntPtr jnienv, IntPtr lrefThis,
IntPtr n_errorCode)
{
ILicenseCheckerCallback __this =
Java.Lang.Object.GetObject<ILicenseCheckerCallback>(lrefThis,
JniHandleOwnership.DoNotTransfer);
using (var errorCode =
Java.Lang.Object.GetObject<ApplicationErrorCode>(n_errorCode,
JniHandleOwnership.DoNotTransfer))
__this.ApplicationError (errorCode);
}
#pragma warning restore 0169
#endregion
// ...
}
Yes, supporting interfaces is ugly.
- Jon
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