JNI Type Signature

http://docs.xamarin.com/android/advanced_topics/Working_With_JNI#JNI_Type_Signatures

http://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/types.html#wp16432

http://www.ibm.com/developerworks/java/tutorials/j-jni/section3.html