[Catalyst] Migrate "Lock screen" entry point

Bug: 372307567
Flag: com.android.settings.flags.catalyst_lockscreen_from_display_settings
Test: manual
Change-Id: I0c269c550c678362f345c9b5438a133c7a76fe10

res/xml/security_lockscreen_settings.xml

@@ -17,6 +17,7 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
+    android:key="lockscreen_from_display_settings"
     android:title="@string/lockscreen_settings_title">
 
     <PreferenceCategory

src/com/android/settings/dashboard/DashboardFragment.java

@@ -427,6 +427,7 @@ public abstract class DashboardFragment extends SettingsPreferenceFragment
     private void removeControllersForHybridMode() {
         Set<String> keys = getPreferenceKeysInHierarchy();
         Iterator<AbstractPreferenceController> iterator = mControllers.iterator();
+        Lifecycle lifecycle = getSettingsLifecycle();
         while (iterator.hasNext()) {
             AbstractPreferenceController controller = iterator.next();
             String key = controller.getPreferenceKey();
@@ -438,6 +439,9 @@ public abstract class DashboardFragment extends SettingsPreferenceFragment
                 if (controllers != null) {
                     controllers.remove(controller);
                 }
+                if (controller instanceof LifecycleObserver) {
+                    lifecycle.removeObserver((LifecycleObserver) controller);
+                }
             }
         }
     }

src/com/android/settings/display/DisplayScreen.kt

@@ -21,6 +21,7 @@ import com.android.settings.R
 import com.android.settings.Settings.DisplaySettingsActivity
 import com.android.settings.display.darkmode.DarkModeScreen
 import com.android.settings.flags.Flags
+import com.android.settings.security.LockScreenPreferenceScreen
 import com.android.settings.utils.makeLaunchIntent
 import com.android.settingslib.metadata.PreferenceAvailabilityProvider
 import com.android.settingslib.metadata.PreferenceIconProvider
@@ -50,9 +51,11 @@ open class DisplayScreen :
 
     override fun fragmentClass() = DisplaySettings::class.java
 
-    override fun getPreferenceHierarchy(context: Context) = preferenceHierarchy(this) {
+    override fun getPreferenceHierarchy(context: Context) =
+        preferenceHierarchy(this) {
             +BrightnessLevelPreference()
             +AutoBrightnessScreen.KEY
+            +LockScreenPreferenceScreen.KEY
             +DarkModeScreen.KEY
             +PeakRefreshRateSwitchPreference()
         }

src/com/android/settings/security/LockScreenPreferenceScreen.kt

@@ -18,12 +18,14 @@ package com.android.settings.security
 import android.content.Context
 import com.android.settings.R
 import com.android.settings.flags.Flags
+import com.android.settings.notification.LockScreenNotificationPreferenceController
+import com.android.settingslib.metadata.PreferenceSummaryProvider
 import com.android.settingslib.metadata.ProvidePreferenceScreen
 import com.android.settingslib.metadata.preferenceHierarchy
 import com.android.settingslib.preference.PreferenceScreenCreator
 
 @ProvidePreferenceScreen
-open class LockScreenPreferenceScreen : PreferenceScreenCreator {
+open class LockScreenPreferenceScreen : PreferenceScreenCreator, PreferenceSummaryProvider {
     override val key: String
         get() = KEY
 
@@ -33,13 +35,17 @@ open class LockScreenPreferenceScreen : PreferenceScreenCreator {
     override val keywords: Int
         get() = R.string.keywords_ambient_display_screen
 
+    override fun getSummary(context: Context): CharSequence? =
+        context.getString(LockScreenNotificationPreferenceController.getSummaryResource(context))
+
     override fun isFlagEnabled(context: Context) = Flags.catalystLockscreenFromDisplaySettings()
 
     override fun hasCompleteHierarchy() = false
 
     override fun fragmentClass() = LockscreenDashboardFragment::class.java
 
-    override fun getPreferenceHierarchy(context: Context) = preferenceHierarchy(this) {
+    override fun getPreferenceHierarchy(context: Context) =
+        preferenceHierarchy(this) {
             // add hierarchy here
         }