Eclipse unable to resolve #include <jni.h>

[Tony Houghton]

I'm trying to learn how to use the NDK by reading the book Android NDK
Beginner's Guide by Sylvain Ratabouil. I've set everything up according
to the book as best I can (it describes old versions of the tools in
some places and has some outright errors too) but I've got stuck at
editing and compiling C/C++ in Eclipse, because it complains about
"Unresolved inclusion: <jni.h>" in the header generated by javah.
ndk-build is fine with it though.

I would have expected Eclipse to set up the include paths for me, but it
doesn't seem to have done that and I don't know how to do it manually.
The book targets android-10 because that's the minimum version for some
feature it uses which hasn't been revealed so far, but the NDK only
provides jni.h for up to android-9. I changed the project's build target
to 8 (the SDK doesn't seem to support 9) but that didn't help.

I guess I need to add one of the paths from the NDK in Project
Properties > Paths and Symbols but I'm not sure about that. If your
project has a newer target than 9 are you supposed to just use the
include path for android-9 from NDK?

[Aristarh Smertin]

Yeah u right - include (both for C and C++) your TARGET sdk platform from Android NDK folder (platforms ->android-9-> arch-arm->usr-> include) hit Apply, when asking to rebuild hit yes, build your app, then you can remove just added paths - it all will be included properly with all standart.

Sometimes rebuilder forgets about it - Index-> Rebuild helps

пятница, 29 июня 2012 г., 19:38:02 UTC+4 пользователь realh написал:

[Doug]

It doesn't actually matter if Eclipse can find jni.h or other platform includes.  They will be found when you do ndk-build outside of Eclipse.  I have found that the latest ADT 20 suppresses those warnings now and has better ndk integration for your projects.

Doug

[a1]

I would have expected Eclipse to set up the include paths for me, but it
doesn't seem to have done that and I don't know how to do it manually.

 

It is easy (but tedious). Rightclick on project select Properties and under C/C++ Build select Paths and Symbols. In Includes tab you have to add all NDK includes directories:

platform includes:

NDK_ROOT/platforms/<api-level>/<arch>/usr/include (eg. NDK_ROOT/platforms/android-9/arch-arm/usr/include)

ARMEABI GCC specific libc includes:

NDK_ROOT/toolchains/<abi>/prebuilt/<os>/lib/gcc/<abi>/4.4.3/include (eg. NDK_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/lib/gcc/arm-linux-androideabi/4.4.3)

std includes (for c++ standard library) - this inclusion config is implementation specific (I use gcc std):

NDK_ROOT/sources/cxx-stl/include

NDK_ROOT/sources/cxx-stl/libs/<abi>/include (eg. NDK_ROOT/sources/cxx-stl/libs/armeabi/include)

When adding remember to check 'add to all languages' checkbox in add path dialog.

--

Bart

[FedeX Tsapanas]

You can do this by choosing Properties for the project

Properties -> C/C++ General -> Preprocessor Include..-> Entries -> Setting Entries -> CDT User Setting Entries

Add -> Include Directory -> File System Path, and enter the path of the includes like:

${NDK_ROOT}\platforms\android-5\arch-arm\usr\include

Also I found that this working for me only if I checked "Contains system headers" checkbox.