code: protected void updateTouchAreaSize() {
  		if (mTouchMode == TOUCH_MODE_BEZEL) {
  			mTouchSize = mTouchBezelSize;
  		} else if (mTouchMode == TOUCH_MODE_FULLSCREEN) {
  			mTouchSize = getMeasuredWidth();
  		} else {
  			mTouchSize = 0;
  		}
  	}
docs: Compute the touch area based on the touch mode.