Hello,
On 2012/06/21 10:05, Wally McClure wrote:
I'm working on an example of using the java binding library. I wanted
to use a fairly well known java library, so a friend told me to use
the commons-math jar library. Ok, sounds good to me. I plug this
into a MfA java binding library, and of course, it generates a bunch
of errors. This is actually good. Now, I need to go through and fix
these errors as noted here:
http://docs.xamarin.com/android/tutorials/Binding_a_Java_Library_%28.jar%29
This kind of Java-vs-C# mismatch always occurs and bites us. There are
common patterns of troubles. We have some listed (I have to say, that's
not very up to date though ...) :
http://docs.xamarin.com/android/tutorials/Binding_a_Java_Library_%28.jar%29#Troublshooting_Bindings
Some of the errors that I am getting are:
Error 1 'Gamma': member names cannot be the same as their
enclosing type C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Special.Gamma.cs
12 23 BindingLibrary
We convert Java names from camelCase to PascalCase and that results in
this kind of problem. Either the member or the type name has to be
renamed via metadata fixup, e.g.
<attr path="/api/package[@name=...]/class[@name=...]"
name="managedName">GanmaType</attr>
Error 2 The type or namespace name 'FirstMoment' does not exist
in the namespace 'Org.Apache.Commons.Math3.Stat.Descriptive.Moment'
(are you missing an assembly reference?)
C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Stat.Descriptive.Moment.Mean.cs
30 70 BindingLibrary
The troubleshooting section in our site (mentioned above) contains "The
binding .dll builds but misses some Java types" row. It contains a
couple of common patterns, which may give you the answer.
Error 5 Type
'Org.Apache.Commons.Math3.Stat.Clustering.EuclideanIntegerPoint'
already defines a member called
'GetCentroidOf_Ljava_util_Collection_Handler' with the same parameter
types C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Stat.Clustering.EuclideanIntegerPoint.cs
90 19 BindingLibrary
The only possibility I can think of is some multiple-methods-to-events
conversion conflict case as Miljenko mentioned. Any other reason is
possible though.
Error 29 The name 'Handle' does not exist in the current
context C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Stat.Descriptive.Moment.SecondMoment.cs
23 22 BindingLibrary
Error 33 The name 'SetHandle' does not exist in the current
context C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Stat.Descriptive.Moment.SecondMoment.cs
51 5 BindingLibrary
I wonder if this type involves "handle" member in the Java library.
That's what we haven't hit yet, but Handle is (as you would know) a
special member from Java.Lang.Object and hence should exist in almost
all types. In that case, this name conflict has to be again resolved by
metadata xml fixup.
Error 35 'object' does not contain a constructor that takes 2
arguments C:\Projects\MonoAndroidAppDev\New in
4.2\Projects\ExampleJavaBindings\BindingLibrary\obj\Debug\generated\src\Org.Apache.Commons.Math3.Stat.Descriptive.Moment.SecondMoment.cs
62 28 BindingLibrary
Maybe this is due to other compilation error that caused type resolution
failure and thus C# compiler tries to lookup the member from
System.Object. This would change after you resolved other issues.
Atsushi Eno
I'm wondering what the proper step is to go about fixing them. Should
I go through the code and manually fix this up? Is there something in
the various transform files I should do? As much assistance as I can
get in minute detail would be helpful.
Wally
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