stavy.sun wrote:
[...]
> #include <stdio.h>
[...]
>       printf("hello testjni!\n");

I think this is your problem; I don't think you can call printf() from 
Android's JNI environment.

(Android has its own libc that is *not* compatible with the glibc 
headers that the CodeSourcery toolchain comes with. While you can bodge 
it and make it work, sort of, it's not very reliable. I'd suggest you 
limit your code to simple calculations and do all your I/O through Java.)

-- 
David Given
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