Bug 10710 - Since upgrading to 4.6 OsmDroidThirdParty fails to build
Summary: Since upgrading to 4.6 OsmDroidThirdParty fails to build
Alias: None
Product: Android
Classification: Xamarin
Component: Bindings ()
Version: 4.6.x
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Atsushi Eno
Depends on:
Reported: 2013-02-26 21:24 UTC by Jeremy Kolb
Modified: 2013-03-01 07:14 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

ZIP containing projects (1.75 MB, application/x-zip-compressed)
2013-02-26 21:27 UTC, Jeremy Kolb

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Description Jeremy Kolb 2013-02-26 21:24:52 UTC
Attached are two bindings projects.  OsmDroidThirdParty depends on OsmDroid and it won't build anymore complaining about:

2>C:\Projects\OsmDroidJavaBindings\OsmDroidThirdParty\obj\Debug\generated\src\OsmDroid.TileProvider.TileSource.Bing.BingMapTileSource.cs(8,23,8,40): error CS0535: 'OsmDroid.TileProvider.TileSource.Bing.BingMapTileSource' does not implement interface member 'OsmDroid.TileProvider.TileSource.IStyledTileSource.SetStyle(string)'
2>C:\Projects\OsmDroidJavaBindings\OsmDroidThirdParty\obj\Debug\generated\src\OsmDroid.TileProvider.TileSource.Bing.BingMapTileSource.cs(8,23,8,40): error CS0738: 'OsmDroid.TileProvider.TileSource.Bing.BingMapTileSource' does not implement interface member 'OsmDroid.TileProvider.TileSource.IStyledTileSource.Style'. 'OsmDroid.TileProvider.TileSource.Bing.BingMapTileSource.Style' cannot implement 'OsmDroid.TileProvider.TileSource.IStyledTileSource.Style' because it does not have the matching return type of 'Java.Lang.Object'.

This seems to be a regression.
Comment 1 Jeremy Kolb 2013-02-26 21:27:41 UTC
Created attachment 3493 [details]
ZIP containing projects
Comment 2 Jeremy Kolb 2013-02-28 18:10:41 UTC
I'm not sure why IStyledTileSource worked before.
Comment 3 Atsushi Eno 2013-03-01 07:14:06 UTC
We have extended support for generics in our jar binding projects which often brings more API, and sometimes results in interface mismatch caused by Java variants. This is not a regression but a new emerged API mismatch between Java and .NET that needs manual fix.

BingMapTileSource implements IStyledTileSource<String> but generic parameter is not expanded in the interface itself. Thus, while Java implements this generic parameter in IStyledTileSource as string in BingMapTileSource, the interface actually expects Java.Lang.Object, which is what JNI expects.

To resolve this mismatch, add the source code below:

using System;
using System.Collections.Generic;
using Android.Runtime;

namespace OsmDroid.TileProvider.TileSource.Bing {
	public partial class BingMapTileSource : global::OsmDroid.TileProvider.TileSource.QuadTreeTileSource, global::OsmDroid.TileProvider.TileSource.IStyledTileSource {
		Java.Lang.Object OsmDroid.TileProvider.TileSource.IStyledTileSource.Style {
			get { return new Java.Lang.String (Style); }
			set { Style = (string) value.JavaCast<Java.Lang.String> (); }

		void OsmDroid.TileProvider.TileSource.IStyledTileSource.SetStyle (string value)
			Style = value;

(There is no formalized way that a Java interface use is bound to certain generic parameter, at least so far, so we don't give explicit interface implementation.)