为什么我不能让getEdgeFlags()检测边缘触摸？我扩展了DrawerLayout，然后做了:@OverridepublicbooleanonInterceptTouchEvent(MotionEventev){intedgeFlags=ev.getEdgeFlags();Log.d(TAG,String.valueOf(edgeFlags));if((MotionEvent.EDGE_LEFT&edgeFlags)!=0||(MotionEvent.EDGE_RIGHT&edgeFlags)!=0)Log.d(TAG,"BEZELintercept.");elseLog.d(T