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> Or are the incompatibilities too great to bother with it?

Yes. Also Google already has multiple development platforms, including one for Android (two, if you count Java and C++ Android development separately, they do have separate development kits).

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Qt could provide a GUI toolkit for C++ on Android.

Last I checked, native apps on Android were limited to raw OpenGL.

That would still require some sort of NDK backend for the Qt toolkit, since X11 is not compatible with the native Android windowing system. I'd imagine that's no small feat.

Well Qt doesn't require X11. Qt's backends are actually VERY flexible, essentially all you need to do is provide it with a 2D drawing surface in most cases.

There is already an Android port of Qt in progress here, with a lot of things (including Qt Quick and QWidgets) already working: http://sourceforge.net/p/necessitas/home/necessitas/ Several apps using Qt have already been published in Google Play.

Well Qt is simply a C++ API and as such can become a standard part of the Android NDK if Google chooses.

Since Google sees the NDK as something that is only intended for legacy code, games or performance hotspots, I doubt that.

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