I don't pass any STL structures across JNI, I pack/unpack just the data I need in to basic types or arrays of basic types, doing my own simple streaming as required.
My application is a board game with the next move calculator in C++ and the UI (and game state) in Java, so there is not much to transfer between the two layers. If you have a lot of state you need to pass back and forth between C++ and Java I suggest you have a look at NativeActivity (I am just starting this myself - so I can be much help here). It looks like it by subclassing the Java NativeActivity class it should be possible to keep my entire engine (and it's state) in C++ and pass just the UI events across the JNI interface. I have not tried this yet - I can feel a test project coming on. On Jun 16, 10:06 pm, "[email protected]" <[email protected]> wrote: > hey Richard, thanks for helping ... in fact, i have installed SDK-NDK, > read the CPLUSPLUS-SUPPORT.html doc, and preparing to compile my C++ > STL stuff, but what i really am afraid is of JNI. There are interfaces > depending of the filed's types, and i dont realize how to pass STL > structures or pointers to them. I wonder if you have a kind of hello- > jni example which you can share in this thread ? > > kriss, i agree with you, but development time is a real constraint :- > ( > > On Jun 16, 3:25 pm, RichardC <[email protected]> wrote: > > > > > > > > > Hi, > > > I have a big "lump" of STL code that is building sucessfully using the > > latest release of the Android-ndk (r5c). It just need a few tweaks. > > It is called from Java via JNI as needed. > > > I sugguest you download the > > NDK:http://developer.android.com/sdk/ndk/index.html > > > and read the docs specifically "CPLUSPLUS-SUPPORT.html" > > > If you have any questions I will try and help. > > > On Jun 16, 4:55 pm, "[email protected]" <[email protected]> > > wrote: > > > > hi guys, > > > I would like to migrate a c/c++ (linux fedora 14) application to > > > android 2.2. > > > Because this will be my first migration, i have some questions about > > > the procedure: > > > > 1. considering it has some STL stuff, i wonder if it will work. I > > > specially use vector, set, map and algoritms (set_union, > > > set_intersection, set_difference). > > > > 2. as i understand i have to write -first- a Java-JNI application > > > which declares and interface my c functions and c++ methods. Those > > > methods willl be included into one (or many) shared libraries ... is > > > it ok ? ... may somebody advise me a good JNI tutorial ? ... i don > > > like the ones i've found :-( > > > > 3- once ready, i must use the NDK toolset in order to generate the > > > android application ... hopefully i will works.. > > > > I am worried because the NDK info says to have a "A Minimal set of > > > headers for C++ support" ... and i wonder if STL works or not ... > > > but, NDK r5 - android - suposse to also hav support for STLport ... > > > does any body has the hello-jni file modifyied for STL suppport ? > > > > NDK Doc also says that "Applications that use native activities must > > > be run on Android 2.3 (API Level 9) or later", but as i understand, i > > > will also needs JNI .. may somebody make some comments about it ? > > > > finally, may somebody share me a JNI example in order to pass some STL > > > functions between java and c++ ? > > > > comments are wellcome. > > > > regards, thanks in advance > > > > hector -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
