Jonathan Pryor <jonp@...> writes:
>
> On Aug 12, 2011, at 8:56 AM, malexandroni wrote:
> > I tried the JS interface in Java and it works fine, but I tried to
replicate the code in Mono for Android and it
> does not work. What am I doing wrong?
>
> That won't work at this point in time.
>
> The problem is reflection: in order for the JavaScript to invoke the method
on the provided Java object,
> Android uses Java reflection in order to see if the method exists, and if it
does to then invoke the method.
> This works in Java because the JavaScriptInterface type has a `showToast`
method.
>
> This doesn't work in Mono for Android, because `mandroid` only generates
Java method declarations for
> methods that override base class methods or implement interface methods.
Consequently, your C#
> JavaScriptInterface.showToast() method isn't visible to the Java world, and
things don't work. (To see
> what I mean, look at obj\Debug\android\src\**\JavaScriptInterface.java, and
see what methods are present.)
>
> We intent to support this in a future release (timeframe: unspecified), but
that doesn't help _now_.
>
> What will help now is a workaround: write your JavaScriptInterface type in
a .java file, include the .java
> file in your project with a AndroidJavaSource Build action, and in
Activity1.OnCreate(), do:
>
> IntPtr JavaScriptInterface_Class = JNIEnv.FindClass
("the/package/for/JavaScriptInterface");
> // TODO: Update "the/package/for" as appropriate for your type.
> IntPtr JavaScriptInterface_ctor = JNIEnv.GetMethodID
(JavaScriptInterface_Class, "<init>", "()V");
> IntPtr instance = JNIEnv.NewObject (JavaScriptInterface_Class,
JavaScriptInterface_ctor);
>
> appView.AddJavascriptInterface (new Java.Lang.Object
(instance), "Android");
>
> - Jon
>
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Hi,
I would be interessted in a quick fix for this. Could you please post a sample
Java file?
Can I write my javascript interface code in the appropriate .net class as it
has to interact with other stuff within my app. So for my understanding, all
we need here is a java type for it?
Many thanks
Maik
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