diff --git a/res/xml/configure_notification_settings_v2.xml b/res/xml/configure_notification_settings_v2.xml
index 6b1e69190e5..a0d2dabdc84 100644
--- a/res/xml/configure_notification_settings_v2.xml
+++ b/res/xml/configure_notification_settings_v2.xml
@@ -42,6 +42,15 @@
         android:key="recent_notifications_category"
         android:title="@string/recent_notifications">
         <!-- Placeholder for a list of recent apps -->
+        <com.android.settings.widget.PrimarySwitchPreference
+            android:key="app1"
+            android:order="5"/>
+        <com.android.settings.widget.PrimarySwitchPreference
+            android:key="app2"
+            android:order="6"/>
+        <com.android.settings.widget.PrimarySwitchPreference
+            android:key="app3"
+            android:order="7"/>
 
         <!-- See all apps button -->
         <Preference
diff --git a/src/com/android/settings/display/BrightnessLevelPreferenceController.java b/src/com/android/settings/display/BrightnessLevelPreferenceController.java
index 2e545721f68..7e0ce66c33e 100644
--- a/src/com/android/settings/display/BrightnessLevelPreferenceController.java
+++ b/src/com/android/settings/display/BrightnessLevelPreferenceController.java
@@ -20,13 +20,15 @@ import static com.android.settingslib.display.BrightnessUtils.convertLinearToGam
 import android.content.ContentResolver;
 import android.content.Context;
 import android.database.ContentObserver;
+import android.hardware.display.BrightnessInfo;
+import android.hardware.display.DisplayManager;
+import android.hardware.display.DisplayManager.DisplayListener;
 import android.net.Uri;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.PowerManager;
 import android.os.RemoteException;
 import android.os.ServiceManager;
-import android.provider.Settings;
 import android.provider.Settings.System;
 import android.service.vr.IVrManager;
 import android.util.Log;
@@ -49,42 +51,53 @@ public class BrightnessLevelPreferenceController extends AbstractPreferenceContr
 
     private static final String TAG = "BrightnessPrefCtrl";
     private static final String KEY_BRIGHTNESS = "brightness";
-    private static final Uri BRIGHTNESS_URI;
     private static final Uri BRIGHTNESS_FOR_VR_URI;
     private static final Uri BRIGHTNESS_ADJ_URI;
 
-    private final float mMinBrightness;
-    private final float mMaxBrightness;
     private final float mMinVrBrightness;
     private final float mMaxVrBrightness;
     private final ContentResolver mContentResolver;
+    private final Handler mHandler = new Handler(Looper.getMainLooper());
+    private final DisplayManager mDisplayManager;
 
     private Preference mPreference;
 
     static {
-        BRIGHTNESS_URI = System.getUriFor(System.SCREEN_BRIGHTNESS_FLOAT);
         BRIGHTNESS_FOR_VR_URI = System.getUriFor(System.SCREEN_BRIGHTNESS_FOR_VR);
         BRIGHTNESS_ADJ_URI = System.getUriFor(System.SCREEN_AUTO_BRIGHTNESS_ADJ);
     }
 
     private ContentObserver mBrightnessObserver =
-            new ContentObserver(new Handler(Looper.getMainLooper())) {
+            new ContentObserver(mHandler) {
                 @Override
                 public void onChange(boolean selfChange) {
                     updatedSummary(mPreference);
                 }
             };
 
+    private final DisplayListener mDisplayListener = new DisplayListener() {
+        @Override
+        public void onDisplayAdded(int displayId) {}
+
+        @Override
+        public void onDisplayRemoved(int displayId) {}
+
+        @Override
+        public void onDisplayChanged(int displayId) {
+            updatedSummary(mPreference);
+        }
+    };
+
+
     public BrightnessLevelPreferenceController(Context context, Lifecycle lifecycle) {
         super(context);
+        mDisplayManager = context.getSystemService(DisplayManager.class);
+
         if (lifecycle != null) {
             lifecycle.addObserver(this);
         }
-        PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
-        mMinBrightness = powerManager.getBrightnessConstraint(
-                PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MINIMUM);
-        mMaxBrightness = powerManager.getBrightnessConstraint(
-                PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MAXIMUM);
+        final PowerManager powerManager = context.getSystemService(PowerManager.class);
+
         mMinVrBrightness = powerManager.getBrightnessConstraint(
                 PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MINIMUM_VR);
         mMaxVrBrightness = powerManager.getBrightnessConstraint(
@@ -115,14 +128,16 @@ public class BrightnessLevelPreferenceController extends AbstractPreferenceContr
 
     @Override
     public void onStart() {
-        mContentResolver.registerContentObserver(BRIGHTNESS_URI, false, mBrightnessObserver);
         mContentResolver.registerContentObserver(BRIGHTNESS_FOR_VR_URI, false, mBrightnessObserver);
         mContentResolver.registerContentObserver(BRIGHTNESS_ADJ_URI, false, mBrightnessObserver);
+        mDisplayManager.registerDisplayListener(mDisplayListener, mHandler,
+                DisplayManager.EVENT_FLAG_DISPLAY_BRIGHTNESS);
     }
 
     @Override
     public void onStop() {
         mContentResolver.unregisterContentObserver(mBrightnessObserver);
+        mDisplayManager.unregisterDisplayListener(mDisplayListener);
     }
 
     private void updatedSummary(Preference preference) {
@@ -132,15 +147,17 @@ public class BrightnessLevelPreferenceController extends AbstractPreferenceContr
     }
 
     private double getCurrentBrightness() {
-        final int value;
+        int value = 0;
         if (isInVrMode()) {
             value = convertLinearToGammaFloat(System.getFloat(mContentResolver,
-                    System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT, mMaxBrightness),
+                    System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT, mMaxVrBrightness),
                     mMinVrBrightness, mMaxVrBrightness);
         } else {
-            value = convertLinearToGammaFloat(Settings.System.getFloat(mContentResolver,
-                    System.SCREEN_BRIGHTNESS_FLOAT, mMinBrightness),
-                    mMinBrightness, mMaxBrightness);
+            final BrightnessInfo info = mContext.getDisplay().getBrightnessInfo();
+            if (info != null) {
+                value = convertLinearToGammaFloat(info.brightness, info.brightnessMinimum,
+                        info.brightnessMaximum);
+            }
         }
         return getPercentage(value, GAMMA_SPACE_MIN, GAMMA_SPACE_MAX);
     }
diff --git a/src/com/android/settings/fuelgauge/BatteryChartView.java b/src/com/android/settings/fuelgauge/BatteryChartView.java
index f970072cb94..366946e12e2 100644
--- a/src/com/android/settings/fuelgauge/BatteryChartView.java
+++ b/src/com/android/settings/fuelgauge/BatteryChartView.java
@@ -103,8 +103,8 @@ public class BatteryChartView extends AppCompatImageView implements View.OnClick
             return;
         }
         // Sets the chart is clickable if there is at least one valid item in it.
-        for (int index = 0; index < mLevels.length; index++) {
-            if (mLevels[index] != 0) {
+        for (int index = 0; index < mLevels.length - 1; index++) {
+            if (mLevels[index] != 0 && mLevels[index + 1] != 0) {
                 setClickable(true);
                 break;
             }
@@ -155,6 +155,11 @@ public class BatteryChartView extends AppCompatImageView implements View.OnClick
             return;
         }
         final int trapezoidIndex = getTrapezoidIndex(mTouchUpEvent.getX());
+        // Ignores the click event if the level is zero.
+        if (trapezoidIndex == SELECTED_INDEX_INVALID
+                || (trapezoidIndex >= 0 && mLevels[trapezoidIndex] == 0)) {
+            return;
+        }
         // Selects all if users click the same trapezoid item two times.
         if (trapezoidIndex == mSelectedIndex) {
             setSelectedIndex(SELECTED_INDEX_ALL);
diff --git a/src/com/android/settings/fuelgauge/ConvertUtils.java b/src/com/android/settings/fuelgauge/ConvertUtils.java
index 2e8726e38ab..00dcb6be62b 100644
--- a/src/com/android/settings/fuelgauge/ConvertUtils.java
+++ b/src/com/android/settings/fuelgauge/ConvertUtils.java
@@ -70,8 +70,12 @@ public final class ConvertUtils {
     public static final int CONSUMER_TYPE_SYSTEM_BATTERY = 3;
 
     private static String sZoneId;
-    private static SimpleDateFormat sSimpleDateFormat;
-    private static SimpleDateFormat sSimpleDateFormatForHour;
+    private static String sZoneIdForHour;
+
+    @VisibleForTesting
+    static SimpleDateFormat sSimpleDateFormat;
+    @VisibleForTesting
+    static SimpleDateFormat sSimpleDateFormatForHour;
 
     private ConvertUtils() {}
 
@@ -140,25 +144,19 @@ public final class ConvertUtils {
             sZoneId = currentZoneId;
             sSimpleDateFormat =
                 new SimpleDateFormat("MMM dd,yyyy HH:mm:ss", Locale.ENGLISH);
-            sSimpleDateFormatForHour = null;
         }
         return sSimpleDateFormat.format(new Date(timestamp));
     }
 
     /** Converts UTC timestamp to local time hour data. */
-    public static int utcToLocalTimeHour(long timestamp) {
+    public static String utcToLocalTimeHour(long timestamp) {
         final String currentZoneId = TimeZone.getDefault().getID();
-        if (!currentZoneId.equals(sZoneId) || sSimpleDateFormatForHour == null) {
-            sZoneId = currentZoneId;
-            sSimpleDateFormat = null;
-            sSimpleDateFormatForHour = new SimpleDateFormat("HH", Locale.ENGLISH);
-        }
-        try {
-            return Integer.parseInt(
-                sSimpleDateFormatForHour.format(new Date(timestamp)));
-        } catch (NumberFormatException e) {
-            return Integer.MIN_VALUE;
+        if (!currentZoneId.equals(sZoneIdForHour) || sSimpleDateFormatForHour == null) {
+            sZoneIdForHour = currentZoneId;
+            sSimpleDateFormatForHour = new SimpleDateFormat("h aa", Locale.ENGLISH);
         }
+        return sSimpleDateFormatForHour.format(new Date(timestamp))
+            .toLowerCase(Locale.getDefault());
     }
 
     /** Gets indexed battery usage data for each corresponding time slot. */
diff --git a/src/com/android/settings/notification/RecentNotifyingAppsPreferenceController.java b/src/com/android/settings/notification/RecentNotifyingAppsPreferenceController.java
index 5396be5ba5e..c71a26aaede 100644
--- a/src/com/android/settings/notification/RecentNotifyingAppsPreferenceController.java
+++ b/src/com/android/settings/notification/RecentNotifyingAppsPreferenceController.java
@@ -49,6 +49,7 @@ import com.android.settings.widget.PrimarySwitchPreference;
 import com.android.settingslib.applications.ApplicationsState;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.utils.StringUtil;
+import com.android.settingslib.utils.ThreadUtils;
 import com.android.settingslib.widget.TwoTargetPreference;
 
 import java.util.ArrayList;
@@ -70,9 +71,9 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
 
     @VisibleForTesting
     static final String KEY_SEE_ALL = "all_notifications";
+    static final String KEY_PLACEHOLDER = "app";
     private static final int SHOW_RECENT_APP_COUNT = 3;
     private static final int DAYS = 3;
-    private static final Set<String> SKIP_SYSTEM_PACKAGES = new ArraySet<>();
 
     private final Fragment mHost;
     private final PackageManager mPm;
@@ -148,13 +149,17 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
 
     @VisibleForTesting
     void refreshUi(Context prefContext) {
-        reloadData();
-        final List<NotifyingApp> recentApps = getDisplayableRecentAppList();
-        if (recentApps != null && !recentApps.isEmpty()) {
-            displayRecentApps(prefContext, recentApps);
-        } else {
-            displayOnlyAllAppsLink();
-        }
+        ThreadUtils.postOnBackgroundThread(() -> {
+            reloadData();
+            final List<NotifyingApp> recentApps = getDisplayableRecentAppList();
+            ThreadUtils.postOnMainThread(() -> {
+                if (recentApps != null && !recentApps.isEmpty()) {
+                    displayRecentApps(prefContext, recentApps);
+                } else {
+                    displayOnlyAllAppsLink();
+                }
+            });
+        });
     }
 
     @VisibleForTesting
@@ -198,8 +203,7 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
         }
     }
 
-    @VisibleForTesting
-    static String getKey(int userId, String pkg) {
+    private static String getKey(int userId, String pkg) {
         return userId + "|" + pkg;
     }
 
@@ -221,19 +225,9 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
         mSeeAllPref.setSummary(null);
         mSeeAllPref.setIcon(R.drawable.ic_chevron_right_24dp);
 
-        // Rebind prefs/avoid adding new prefs if possible. Adding/removing prefs causes jank.
-        // Build a cached preference pool
-        final Map<String, PrimarySwitchPreference> appPreferences = new ArrayMap<>();
-        int prefCount = mCategory.getPreferenceCount();
-        for (int i = 0; i < prefCount; i++) {
-            final Preference pref = mCategory.getPreference(i);
-            final String key = pref.getKey();
-            if (!TextUtils.equals(key, KEY_SEE_ALL)) {
-                appPreferences.put(key, (PrimarySwitchPreference) pref);
-            }
-        }
+        int keyIndex = 1;
         final int recentAppsCount = recentApps.size();
-        for (int i = 0; i < recentAppsCount; i++) {
+        for (int i = 0; i < recentAppsCount; i++, keyIndex++) {
             final NotifyingApp app = recentApps.get(i);
             // Bind recent apps to existing prefs if possible, or create a new pref.
             final String pkgName = app.getPackage();
@@ -243,20 +237,12 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
                 continue;
             }
 
-            boolean rebindPref = true;
-            PrimarySwitchPreference pref = appPreferences.remove(getKey(app.getUserId(),
-                    pkgName));
-            if (pref == null) {
-                pref = new PrimarySwitchPreference(prefContext);
-                rebindPref = false;
-            }
-            pref.setKey(getKey(app.getUserId(), pkgName));
+            PrimarySwitchPreference pref = mCategory.findPreference(KEY_PLACEHOLDER + keyIndex);
             pref.setTitle(appEntry.label);
             pref.setIcon(mIconDrawableFactory.getBadgedIcon(appEntry.info));
             pref.setIconSize(TwoTargetPreference.ICON_SIZE_SMALL);
             pref.setSummary(StringUtil.formatRelativeTime(mContext,
                     System.currentTimeMillis() - app.getLastNotified(), true));
-            pref.setOrder(i);
             Bundle args = new Bundle();
             args.putString(AppInfoBase.ARG_PACKAGE_NAME, pkgName);
             args.putInt(AppInfoBase.ARG_PACKAGE_UID, appEntry.info.uid);
@@ -280,13 +266,10 @@ public class RecentNotifyingAppsPreferenceController extends AbstractPreferenceC
             pref.setChecked(
                     !mNotificationBackend.getNotificationsBanned(pkgName, appEntry.info.uid));
 
-            if (!rebindPref) {
-                mCategory.addPreference(pref);
-            }
         }
-        // Remove unused prefs from pref cache pool
-        for (Preference unusedPrefs : appPreferences.values()) {
-            mCategory.removePreference(unusedPrefs);
+        // If there are less than SHOW_RECENT_APP_COUNT recent apps, remove placeholders
+        for (int i = keyIndex; i <= SHOW_RECENT_APP_COUNT; i++) {
+            mCategory.removePreferenceRecursively(KEY_PLACEHOLDER + i);
         }
     }
 
diff --git a/tests/robotests/src/com/android/settings/display/BrightnessLevelPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/display/BrightnessLevelPreferenceControllerTest.java
index 15d4c973baf..8fd847a8073 100644
--- a/tests/robotests/src/com/android/settings/display/BrightnessLevelPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/display/BrightnessLevelPreferenceControllerTest.java
@@ -22,15 +22,16 @@ import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.content.ContentResolver;
 import android.content.Context;
+import android.hardware.display.BrightnessInfo;
 import android.os.PowerManager;
 import android.provider.Settings.System;
+import android.view.Display;
 
 import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
@@ -52,6 +53,8 @@ public class BrightnessLevelPreferenceControllerTest {
     @Mock
     private PowerManager mPowerManager;
     @Mock
+    private Display mDisplay;
+    @Mock
     private PreferenceScreen mScreen;
     @Mock
     private Preference mPreference;
@@ -65,7 +68,7 @@ public class BrightnessLevelPreferenceControllerTest {
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        mContext = RuntimeEnvironment.application;
+        mContext = spy(RuntimeEnvironment.application);
         mContentResolver = mContext.getContentResolver();
         when(mPowerManager.getBrightnessConstraint(
                 PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MINIMUM)).thenReturn(0.0f);
@@ -78,6 +81,7 @@ public class BrightnessLevelPreferenceControllerTest {
         ShadowApplication.getInstance().setSystemService(POWER_SERVICE,
                 mPowerManager);
         when(mScreen.findPreference(anyString())).thenReturn(mPreference);
+        when(mContext.getDisplay()).thenReturn(mDisplay);
         mController = spy(new BrightnessLevelPreferenceController(mContext, null));
         doReturn(false).when(mController).isInVrMode();
     }
@@ -101,8 +105,6 @@ public class BrightnessLevelPreferenceControllerTest {
 
         controller.onStart();
 
-        assertThat(shadowContentResolver.getContentObservers(
-                System.getUriFor(System.SCREEN_BRIGHTNESS_FLOAT))).isNotEmpty();
         assertThat(shadowContentResolver.getContentObservers(
                 System.getUriFor(System.SCREEN_BRIGHTNESS_FOR_VR))).isNotEmpty();
         assertThat(shadowContentResolver.getContentObservers(
@@ -119,8 +121,6 @@ public class BrightnessLevelPreferenceControllerTest {
         controller.onStart();
         controller.onStop();
 
-        assertThat(shadowContentResolver.getContentObservers(
-                System.getUriFor(System.SCREEN_BRIGHTNESS_FLOAT))).isEmpty();
         assertThat(shadowContentResolver.getContentObservers(
                 System.getUriFor(System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT))).isEmpty();
         assertThat(shadowContentResolver.getContentObservers(
@@ -143,7 +143,8 @@ public class BrightnessLevelPreferenceControllerTest {
         System.putInt(mContentResolver, System.SCREEN_BRIGHTNESS_MODE,
                 System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
 
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, 0.1f);
+        when(mDisplay.getBrightnessInfo()).thenReturn(
+                new BrightnessInfo(0.1f, 0.0f, 1.0f, BrightnessInfo.HIGH_BRIGHTNESS_MODE_OFF));
 
         mController.updateState(mPreference);
 
@@ -156,7 +157,8 @@ public class BrightnessLevelPreferenceControllerTest {
         System.putInt(mContentResolver, System.SCREEN_BRIGHTNESS_MODE,
                 System.SCREEN_BRIGHTNESS_MODE_MANUAL);
 
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, 0.5f);
+        when(mDisplay.getBrightnessInfo()).thenReturn(
+                new BrightnessInfo(0.5f, 0.0f, 1.0f, BrightnessInfo.HIGH_BRIGHTNESS_MODE_OFF));
 
         mController.updateState(mPreference);
 
@@ -175,32 +177,5 @@ public class BrightnessLevelPreferenceControllerTest {
         System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT, -20f);
         mController.updateState(mPreference);
         verify(mPreference).setSummary("0%");
-
-        // Auto mode
-        doReturn(false).when(mController).isInVrMode();
-        System.putInt(mContentResolver, System.SCREEN_BRIGHTNESS_MODE,
-                System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
-
-        reset(mPreference);
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, 1.15f);
-        mController.updateState(mPreference);
-        verify(mPreference).setSummary("100%");
-
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, -10f);
-        mController.updateState(mPreference);
-        verify(mPreference).setSummary("0%");
-
-        // Manual mode
-        System.putInt(mContentResolver, System.SCREEN_BRIGHTNESS_MODE,
-                System.SCREEN_BRIGHTNESS_MODE_MANUAL);
-
-        reset(mPreference);
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, 1.15f);
-        mController.updateState(mPreference);
-        verify(mPreference).setSummary("100%");
-
-        System.putFloat(mContentResolver, System.SCREEN_BRIGHTNESS_FLOAT, -10f);
-        mController.updateState(mPreference);
-        verify(mPreference).setSummary("0%");
     }
 }
diff --git a/tests/robotests/src/com/android/settings/fuelgauge/ConvertUtilsTest.java b/tests/robotests/src/com/android/settings/fuelgauge/ConvertUtilsTest.java
index e95b158391b..12913a29dc8 100644
--- a/tests/robotests/src/com/android/settings/fuelgauge/ConvertUtilsTest.java
+++ b/tests/robotests/src/com/android/settings/fuelgauge/ConvertUtilsTest.java
@@ -39,10 +39,12 @@ import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 
+import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
 
@@ -254,6 +256,32 @@ public final class ConvertUtilsTest {
         assertBatteryDiffEntry(entryList.get(0), 68, 40L, 50L);
     }
 
+    @Test
+    public void testUtcToLocalTime_returnExpectedResult() {
+          final long timestamp = 1619196786769L;
+          ConvertUtils.sSimpleDateFormat = null;
+          // Invokes the method first to create the SimpleDateFormat.
+          ConvertUtils.utcToLocalTime(/*timestamp=*/ 0);
+          ConvertUtils.sSimpleDateFormat
+              .setTimeZone(TimeZone.getTimeZone("GMT"));
+
+          assertThat(ConvertUtils.utcToLocalTime(timestamp))
+              .isEqualTo("Apr 23,2021 16:53:06");
+    }
+
+    @Test
+    public void testUtcToLocalTmeHour_returnExpectedResult() {
+          final long timestamp = 1619196786769L;
+          ConvertUtils.sSimpleDateFormatForHour = null;
+          // Invokes the method first to create the SimpleDateFormat.
+          ConvertUtils.utcToLocalTimeHour(/*timestamp=*/ 0);
+          ConvertUtils.sSimpleDateFormatForHour
+              .setTimeZone(TimeZone.getTimeZone("GMT"));
+
+          assertThat(ConvertUtils.utcToLocalTimeHour(timestamp))
+              .isEqualTo("4 pm");
+    }
+
     private static BatteryHistEntry createBatteryHistEntry(
             String packageName, String appLabel, double consumePower,
             long uid, long foregroundUsageTimeInMs, long backgroundUsageTimeInMs) {
diff --git a/tests/robotests/src/com/android/settings/notification/RecentNotifyingAppsPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/notification/RecentNotifyingAppsPreferenceControllerTest.java
index 6226b9a318b..983bf535bdd 100644
--- a/tests/robotests/src/com/android/settings/notification/RecentNotifyingAppsPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/notification/RecentNotifyingAppsPreferenceControllerTest.java
@@ -48,6 +48,7 @@ import android.service.notification.NotifyingApp;
 import android.text.TextUtils;
 
 import com.android.settings.R;
+import com.android.settings.widget.PrimarySwitchPreference;
 import com.android.settingslib.applications.AppUtils;
 import com.android.settingslib.applications.ApplicationsState;
 import com.android.settingslib.applications.instantapps.InstantAppDataProvider;
@@ -80,6 +81,9 @@ public class RecentNotifyingAppsPreferenceControllerTest {
     private PreferenceScreen mScreen;
     @Mock
     private PreferenceCategory mCategory;
+    private PrimarySwitchPreference mApp1;
+    private PrimarySwitchPreference mApp2;
+    private PrimarySwitchPreference mApp3;
     @Mock
     private Preference mSeeAllPref;
     @Mock
@@ -115,6 +119,15 @@ public class RecentNotifyingAppsPreferenceControllerTest {
         mController = new RecentNotifyingAppsPreferenceController(
                 mContext, mBackend, mIUsageStatsManager, mUserManager, mAppState, mHost);
         when(mScreen.findPreference(anyString())).thenReturn(mCategory);
+        mApp1 = new PrimarySwitchPreference(mContext);
+        mApp1.setKey("app1");
+        mApp2 = new PrimarySwitchPreference(mContext);
+        mApp2.setKey("app2");
+        mApp3 = new PrimarySwitchPreference(mContext);
+        mApp3.setKey("app3");
+        when(mCategory.findPreference("app1")).thenReturn(mApp1);
+        when(mCategory.findPreference("app2")).thenReturn(mApp2);
+        when(mCategory.findPreference("app3")).thenReturn(mApp3);
 
         when(mScreen.findPreference(RecentNotifyingAppsPreferenceController.KEY_SEE_ALL))
                 .thenReturn(mSeeAllPref);
@@ -169,12 +182,18 @@ public class RecentNotifyingAppsPreferenceControllerTest {
         app2.mPackage = "pkg.class2";
         app2.mTimeStamp = System.currentTimeMillis() - 1000;
         events.add(app2);
+        ApplicationsState.AppEntry app1Entry = mock(ApplicationsState.AppEntry.class);
+        ApplicationsState.AppEntry app2Entry = mock(ApplicationsState.AppEntry.class);
+        app1Entry.info = mApplicationInfo;
+        app1Entry.label = "app 1";
+        app2Entry.info = mApplicationInfo;
+        app2Entry.label = "app 2";
 
         // app1, app2 are valid apps. app3 is invalid.
         when(mAppState.getEntry(app.getPackageName(), UserHandle.myUserId()))
-                .thenReturn(mAppEntry);
+                .thenReturn(app1Entry);
         when(mAppState.getEntry(app1.getPackageName(), UserHandle.myUserId()))
-                .thenReturn(mAppEntry);
+                .thenReturn(app2Entry);
         when(mAppState.getEntry(app2.getPackageName(), UserHandle.myUserId()))
                 .thenReturn(null);
         when(mPackageManager.resolveActivity(any(Intent.class), anyInt())).thenReturn(
@@ -192,7 +211,10 @@ public class RecentNotifyingAppsPreferenceControllerTest {
 
         verify(mCategory).setTitle(R.string.recent_notifications);
         // Only add app1 & app2. app3 skipped because it's invalid app.
-        verify(mCategory, times(2)).addPreference(any(Preference.class));
+        assertThat(mApp1.getTitle()).isEqualTo(app1Entry.label);
+        assertThat(mApp2.getTitle()).isEqualTo(app2Entry.label);
+
+        verify(mCategory).removePreferenceRecursively(mApp3.getKey());
 
         verify(mSeeAllPref).setSummary(null);
         verify(mSeeAllPref).setIcon(R.drawable.ic_chevron_right_24dp);
@@ -209,22 +231,24 @@ public class RecentNotifyingAppsPreferenceControllerTest {
         Event app1 = new Event();
         app1.mEventType = Event.NOTIFICATION_INTERRUPTION;
         app1.mPackage = "com.foo.barinstant";
-        app1.mTimeStamp = System.currentTimeMillis() + 200;
+        app1.mTimeStamp = System.currentTimeMillis() - 200;
         events.add(app1);
         UsageEvents usageEvents = getUsageEvents(
                 new String[] {"com.foo.bar", "com.foo.barinstant"}, events);
         when(mIUsageStatsManager.queryEventsForUser(anyLong(), anyLong(), anyInt(), anyString()))
                 .thenReturn(usageEvents);
 
+        ApplicationsState.AppEntry appEntry = mock(ApplicationsState.AppEntry.class);
         ApplicationsState.AppEntry app1Entry = mock(ApplicationsState.AppEntry.class);
-        ApplicationsState.AppEntry app2Entry = mock(ApplicationsState.AppEntry.class);
+        appEntry.info = mApplicationInfo;
+        appEntry.label = "app 1";
         app1Entry.info = mApplicationInfo;
-        app2Entry.info = mApplicationInfo;
+        app1Entry.label = "app 2";
 
         when(mAppState.getEntry(
-                app.getPackageName(), UserHandle.myUserId())).thenReturn(app1Entry);
+                app.getPackageName(), UserHandle.myUserId())).thenReturn(appEntry);
         when(mAppState.getEntry(
-                app1.getPackageName(), UserHandle.myUserId())).thenReturn(app2Entry);
+                app1.getPackageName(), UserHandle.myUserId())).thenReturn(app1Entry);
 
         // Only the regular app app1 should have its intent resolve.
         when(mPackageManager.resolveActivity(argThat(intentMatcher(app.getPackageName())),
@@ -233,7 +257,7 @@ public class RecentNotifyingAppsPreferenceControllerTest {
         // Make sure app2 is considered an instant app.
         ReflectionHelpers.setStaticField(AppUtils.class, "sInstantAppDataProvider",
                 (InstantAppDataProvider) (ApplicationInfo info) -> {
-                    if (info == app2Entry.info) {
+                    if (info == app1Entry.info) {
                         return true;
                     } else {
                         return false;
@@ -242,15 +266,10 @@ public class RecentNotifyingAppsPreferenceControllerTest {
 
         mController.displayPreference(mScreen);
 
-        ArgumentCaptor<Preference> prefCaptor = ArgumentCaptor.forClass(Preference.class);
-        verify(mCategory, times(2)).addPreference(prefCaptor.capture());
-        List<Preference> prefs = prefCaptor.getAllValues();
-        assertThat(prefs.get(1).getKey()).isEqualTo(
-                RecentNotifyingAppsPreferenceController.getKey(UserHandle.myUserId(),
-                        app.getPackageName()));
-        assertThat(prefs.get(0).getKey()).isEqualTo(
-                RecentNotifyingAppsPreferenceController.getKey(UserHandle.myUserId(),
-                        app1.getPackageName()));
+        assertThat(mApp1.getTitle()).isEqualTo(appEntry.label);
+        assertThat(mApp2.getTitle()).isEqualTo(app1Entry.label);
+
+        verify(mCategory).removePreferenceRecursively(mApp3.getKey());
     }
 
     @Test
@@ -274,7 +293,7 @@ public class RecentNotifyingAppsPreferenceControllerTest {
 
         mController.displayPreference(mScreen);
 
-        verify(mCategory).addPreference(argThat(summaryMatches("Just now")));
+        assertThat(mApp1.getSummary()).isEqualTo("Just now");
     }
 
     @Test