安卓5.1屏蔽锁屏界面下拉栏

rameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java

if (mKeyguardShowing) {
            updateHeaderKeyguard();
        }

改为

if (mKeyguardShowing) {
            //updateHeaderKeyguard();
            setQsExpanded(false);
        }