1、禁止systemUI下拉状态栏和通知栏的核心代码部分

framework/base/packages/apps/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
framework/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/CollapsedStatusBarFragment.java
framework/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
/framework/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/notification/NotificationStackScrollLayout.java

2、禁止systemUI下拉状态栏和通知栏，考虑需要在锁屏状态下，和未锁屏状态下

2.1 没有锁屏状态下通过
KeyguardViewMediator.java来在adjustStatusBarLocked(）中通过设置StatusBarManager的flag
属性来设置禁用下拉状态栏，然后在开机以后就禁用下拉状态栏达到禁用的目的

framework/base/packages/apps/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

private void handleShow(Bundle options) {Trace.beginSection("KeyguardViewMediator#handleShow");final int currentUser = KeyguardUpdateMonitor.getCurrentUser();if (mLockPatternUtils.isSecure(currentUser)) {mLockPatternUtils.getDevicePolicyManager().reportKeyguardSecured(currentUser);}synchronized (KeyguardViewMediator.this) {if (!mSystemReady) {if (DEBUG) Log.d(TAG, "ignoring handleShow because system is not ready.");return;} else {if (DEBUG) Log.d(TAG, "handleShow");}mHiding = false;mWakeAndUnlocking = false;setShowingLocked(true);mKeyguardViewControllerLazy.get().show(options);resetKeyguardDonePendingLocked();mHideAnimationRun = false;adjustStatusBarLocked();userActivity();mUpdateMonitor.setKeyguardGoingAway(false);mKeyguardViewControllerLazy.get().setKeyguardGoingAwayState(false);mShowKeyguardWakeLock.release();}private void adjustStatusBarLocked(boolean forceHideHomeRecentsButtons,
boolean forceClearFlags) {
if (mStatusBarManager == null) {
mStatusBarManager = (StatusBarManager)
mContext.getSystemService(Context.STATUS_BAR_SERVICE);
}if (mStatusBarManager == null) {
Log.w(TAG, "Could not get status bar manager");
} else {
// Disable aspects of the system/status/navigation bars that must not be re-enabled by
// windows that appear on top, ever
int flags = StatusBarManager.DISABLE_NONE;// TODO (b/155663717) After restart, status bar will not properly hide home button
//  unless disable is called to show un-hide it once first
if (forceClearFlags) {
mStatusBarManager.disable(flags);
}if (forceHideHomeRecentsButtons || isShowingAndNotOccluded()) {
if (!mShowHomeOverLockscreen || !mInGestureNavigationMode) {
flags |= StatusBarManager.DISABLE_HOME;
}
flags |= StatusBarManager.DISABLE_RECENT;
}if (DEBUG) {
Log.d(TAG, "adjustStatusBarLocked: mShowing=" + mShowing + " mOccluded=" + mOccluded
+ " isSecure=" + isSecure() + " force=" + forceHideHomeRecentsButtons
+  " --> flags=0x" + Integer.toHexString(flags));
}mStatusBarManager.disable(flags);
}
}

在调用show 显示状态栏的时候，adjustStatusBarLocked() 可以设置 mStatusBarManager 的flag为StatusBarManager.DISABLE_EXPAND表示禁用下拉状态栏

@@ -2168,7 +2168,7 @@ public class KeyguardViewMediator extends SystemUI {+ " isSecure=" + isSecure() + " force=" + forceHideHomeRecentsButtons+  " --> flags=0x" + Integer.toHexString(flags));}
-
+            flags = StatusBarManager.DISABLE_EXPAND;mStatusBarManager.disable(flags);}}

2.2 StatusBar 中不显示通知信息的图片:

在锁屏通知栏中去掉显示通知的部分，达到禁用下拉状态栏的功能
主要实现如下：
framework/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/CollapsedStatusBarFragment.java

@@ -159,7 +159,8 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueueif ((state1 & DISABLE_NOTIFICATION_ICONS) != 0) {hideNotificationIconArea(animate);} else {
-                showNotificationIconArea(animate);
+                //showNotificationIconArea(animate);
+                hideNotificationIconArea(animate);}}

2.3 锁屏是 禁止状态栏下拉
在锁屏状态下禁用下拉状态栏 通知界面NotificationPanelView.java 去掉下拉开展状态栏部分的功能

路径

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

@@ -908,7 +908,7 @@ public class NotificationPanelView extends PanelView implementsif (!isFullyCollapsed()) {handleQsDown(event);}
-        if (!mQsExpandImmediate && mQsTracking) {
+        if (!mKeyguardShowing && !mQsExpandImmediate && mQsTracking) {onQsTouch(event);if (!mConflictingQsExpansionGesture) {return true;
@@ -1114,6 +1114,9 @@ public class NotificationPanelView extends PanelView implements}private void setQsExpanded(boolean expanded) {
+        if (mKeyguardShowing) {
+            return;
+        }boolean changed = mQsExpanded != expanded;if (changed) {mQsExpanded = expanded;
@@ -1508,7 +1511,7 @@ public class NotificationPanelView extends PanelView implementsif (!mQsExpansionEnabled || mCollapsedOnDown) {return false;}
-        View header = mKeyguardShowing ? mKeyguardStatusBar : mQs.getHeader();
+        View header = /*mKeyguardShowing ? mKeyguardStatusBar :*/ mQs.getHeader();final boolean onHeader = x >= mQsFrame.getX()&& x <= mQsFrame.getX() + mQsFrame.getWidth()&& y >= header.getTop() && y <= header.getBottom();

2.4 锁屏状态隐藏通知栏的显示
禁止显示通知栏

/framework/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/notification/NotificationStackScrollLayout.java

@@ -717,7 +717,8 @@ public class NotificationStackScrollLayout extends ViewGroup}private void setMaxLayoutHeight(int maxLayoutHeight) {
-        mMaxLayoutHeight = maxLayoutHeight;
+        //mMaxLayoutHeight = maxLayoutHeight;
+        mMaxLayoutHeight = 0;mShelf.setMaxLayoutHeight(maxLayoutHeight);updateAlgorithmHeightAndPadding();}
@@ -2590,9 +2591,10 @@ public class NotificationStackScrollLayout extends ViewGroup} else {mTopPaddingOverflow = 0;}
-        setTopPadding(ignoreIntrinsicPadding ? topPadding : clampPadding(topPadding),
-                animate);
-        setExpandedHeight(mExpandedHeight);
+        //setTopPadding(ignoreIntrinsicPadding ? topPadding : clampPadding(topPadding),
+        //        animate);
+        //setExpandedHeight(mExpandedHeight);
+        setTopPadding(-500,animate);}