KeyEvent dose not inherit from InputEvent

I have a problem about that KeyEvent inherits from CJNIBase in /xbmc/platform/android/jni/KeyEvent.h, but not InputEvent. While in /frameworks/base/core/java/android/view/KwyEvent.java, KeyEvent inherits from InputEvent?The injectInputEvent(InputEvent ev, int mod);I want to put the keyevent into the InputEvent,This dose’t work.Please help me?