Android keyboard height

Hello! I need get height of Android keyboard. TouchScreenKeyboard.area.height return 0 for Android. I try to write own keyboard for android (android plugin). But I stopped on activity.findViewById(viewid) - return always null - not find view by resource id. (this need me for initialize new Keyboard:

mKeyboardView= (KeyboardView)mHostActivity.findViewById(viewid);
mKeyboardView.setKeyboard(new Keyboard(mHostActivity, layoutid));
mKeyboardView.setPreviewEnabled(false); // NOTE Do not show the preview balloons

Probably to late for the OP. But for anyone else using google then this thread over here had an answer that worked for me.