I call a C++ function over JNI and pass a RGBA_8888 bitmap, lock it, change the values, unlock it, return and then display it in Java with this C++ code:

AndroidBitmap_getInfo(env, map, &info) < 0);
AndroidBitmap_lockPixels(env, map, (void**)&pixel);

for(i=info.width*info.height-1;i>=0;i--)
{   pixel[i] = 0xf1f1f1f1;
}

AndroidBitmap_unlockPixels(env, map);

The problem I have is that the bitmaps looks not as I expect it and the pixel values (verified with getPixel) are not the same when I check them in Java from what I set them in C++. When I set the bitmap values to 0xffffffff I get the correct value in Java, but for many others I don't. 0xf1f1f1f1 for example turns into 0xF1FFFFFF.

What do I have to do to make it work ?

PS: I am using Android 2.3.4