I tested sf::Font in "example" - it does not work, i don't know why yet. Transparency in test sprite does not work too. Just clear window with non-white color - it is immediately obvious.
loadLibrary("sfml-system", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-window", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-graphics", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-audio", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-network", lJNIEnv, ObjectActivityInfo);
In debug build this code is incorrect.
Retrived sf::Err() output:
sf::Quads primitive type is not supported on OpenGL ES platforms, drawing skipped
Indeed, Mario, somewhere i'm using quads. But this is only part of render problems.