diff --git a/src/com/android/settings/notification/AppNotificationSettings.java b/src/com/android/settings/notification/AppNotificationSettings.java
index 99e9458..bbfbe5e 100644
--- a/src/com/android/settings/notification/AppNotificationSettings.java
+++ b/src/com/android/settings/notification/AppNotificationSettings.java
@@ -16,6 +16,8 @@
 
 package com.android.settings.notification;
 
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
+
 import android.app.NotificationChannel;
 import android.app.NotificationChannelGroup;
 import android.content.Context;
@@ -28,6 +30,8 @@
 import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
 import android.util.Log;
+import android.view.Window;
+import android.view.WindowManager;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.internal.widget.LockPatternUtils;
@@ -81,6 +85,9 @@
     public void onResume() {
         super.onResume();
 
+        getActivity().getWindow().addPrivateFlags(PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
+        android.util.EventLog.writeEvent(0x534e4554, "119115683", -1, "");
+
         if (mUid < 0 || TextUtils.isEmpty(mPkg) || mPkgInfo == null) {
             Log.w(TAG, "Missing package or uid or packageinfo");
             finish();
@@ -115,6 +122,15 @@
     }
 
     @Override
+    public void onPause() {
+        super.onPause();
+        final Window window = getActivity().getWindow();
+        final WindowManager.LayoutParams attrs = window.getAttributes();
+        attrs.privateFlags &= ~PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
+        window.setAttributes(attrs);
+    }
+
+    @Override
     protected String getLogTag() {
         return TAG;
     }
diff --git a/src/com/android/settings/security/ScreenPinningSettings.java b/src/com/android/settings/security/ScreenPinningSettings.java
index 6e4856e..0af7b72 100644
--- a/src/com/android/settings/security/ScreenPinningSettings.java
+++ b/src/com/android/settings/security/ScreenPinningSettings.java
@@ -115,9 +115,13 @@
     }
 
     private boolean isScreenLockUsed() {
-        int def = getCurrentSecurityTitle() != R.string.screen_pinning_unlock_none ? 1 : 0;
-        return Settings.Secure.getInt(getContentResolver(),
-                Settings.Secure.LOCK_TO_APP_EXIT_LOCKED, def) != 0;
+        // This functionality should be kept consistent with
+        // com.android.server.wm.LockTaskController (see b/127605586)
+        int defaultValueIfSettingNull = mLockPatternUtils.isSecure(UserHandle.myUserId()) ? 1 : 0;
+        return Settings.Secure.getInt(
+                getContentResolver(),
+                Settings.Secure.LOCK_TO_APP_EXIT_LOCKED,
+                defaultValueIfSettingNull) != 0;
     }
 
     private boolean setScreenLockUsed(boolean isEnabled) {