diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index 71a05a9..076fddf 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -1597,6 +1597,10 @@
     method public void restoreDozeSettings(int);
   }
 
+  public final class ColorDisplayManager {
+    method @FlaggedApi("android.app.modes_api") @RequiresPermission(android.Manifest.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS) public boolean isSaturationActivated();
+  }
+
   public final class DisplayManager {
     method public boolean areUserDisabledHdrTypesAllowed();
     method @RequiresPermission(android.Manifest.permission.MODIFY_USER_PREFERRED_DISPLAY_MODE) public void clearGlobalUserPreferredDisplayMode();
diff --git a/core/java/android/hardware/display/ColorDisplayManager.java b/core/java/android/hardware/display/ColorDisplayManager.java
index aafa7d5..f927b8b 100644
--- a/core/java/android/hardware/display/ColorDisplayManager.java
+++ b/core/java/android/hardware/display/ColorDisplayManager.java
@@ -17,12 +17,14 @@
 package android.hardware.display;
 
 import android.Manifest;
+import android.annotation.FlaggedApi;
 import android.annotation.IntDef;
 import android.annotation.IntRange;
 import android.annotation.NonNull;
 import android.annotation.RequiresPermission;
 import android.annotation.SystemApi;
 import android.annotation.SystemService;
+import android.annotation.TestApi;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.metrics.LogMaker;
@@ -397,6 +399,8 @@
      * @return {@code true} if the display is not at full saturation
      * @hide
      */
+    @TestApi
+    @FlaggedApi(android.app.Flags.FLAG_MODES_API)
     @RequiresPermission(Manifest.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS)
     public boolean isSaturationActivated() {
         return mManager.isSaturationActivated();
diff --git a/core/java/android/service/notification/DeviceEffectsApplier.java b/core/java/android/service/notification/DeviceEffectsApplier.java
new file mode 100644
index 0000000..234ff4d
--- /dev/null
+++ b/core/java/android/service/notification/DeviceEffectsApplier.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.service.notification;
+
+/**
+ * Responsible for making any service calls needed to apply the set of {@link ZenDeviceEffects} that
+ * make sense for the current platform.
+ * @hide
+ */
+public interface DeviceEffectsApplier {
+    /**
+     * Applies the {@link ZenDeviceEffects} to the device.
+     *
+     * <p>The supplied {@code effects} represents the "consolidated" device effects, i.e. the
+     * union of the effects of all the {@link ZenModeConfig.ZenRule} instances that are currently
+     * active. If no rules are active (or no active rules specify custom effects) then {@code
+     * effects} will be all-default (i.e. {@link ZenDeviceEffects#hasEffects} will return {@code
+     * false}.
+     *
+     * <p>This will be called whenever the set of consolidated effects changes (normally through
+     * the activation or deactivation of zen rules).
+     */
+    void apply(ZenDeviceEffects effects);
+}
diff --git a/core/java/android/service/notification/ZenDeviceEffects.java b/core/java/android/service/notification/ZenDeviceEffects.java
index db0b7ff..0e82b6c 100644
--- a/core/java/android/service/notification/ZenDeviceEffects.java
+++ b/core/java/android/service/notification/ZenDeviceEffects.java
@@ -18,6 +18,7 @@
 
 import android.annotation.FlaggedApi;
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.app.Flags;
 import android.os.Parcel;
 import android.os.Parcelable;
@@ -359,6 +360,27 @@
             return this;
         }
 
+        /**
+         * Applies the effects that are {@code true} on the supplied {@link ZenDeviceEffects} to
+         * this builder (essentially logically-ORing the effect set).
+         * @hide
+         */
+        @NonNull
+        public Builder add(@Nullable ZenDeviceEffects effects) {
+            if (effects == null) return this;
+            if (effects.shouldDisplayGrayscale()) setShouldDisplayGrayscale(true);
+            if (effects.shouldSuppressAmbientDisplay()) setShouldSuppressAmbientDisplay(true);
+            if (effects.shouldDimWallpaper()) setShouldDimWallpaper(true);
+            if (effects.shouldUseNightMode()) setShouldUseNightMode(true);
+            if (effects.shouldDisableAutoBrightness()) setShouldDisableAutoBrightness(true);
+            if (effects.shouldDisableTapToWake()) setShouldDisableTapToWake(true);
+            if (effects.shouldDisableTiltToWake()) setShouldDisableTiltToWake(true);
+            if (effects.shouldDisableTouch()) setShouldDisableTouch(true);
+            if (effects.shouldMinimizeRadioUsage()) setShouldMinimizeRadioUsage(true);
+            if (effects.shouldMaximizeDoze()) setShouldMaximizeDoze(true);
+            return this;
+        }
+
         /** Builds a {@link ZenDeviceEffects} object based on the builder's state. */
         @NonNull
         public ZenDeviceEffects build() {
diff --git a/data/etc/privapp-permissions-platform.xml b/data/etc/privapp-permissions-platform.xml
index 3cf28c9..69a6e6d 100644
--- a/data/etc/privapp-permissions-platform.xml
+++ b/data/etc/privapp-permissions-platform.xml
@@ -535,6 +535,8 @@
         <!-- Permission required for CTS test IntentRedirectionTest -->
         <permission name="android.permission.QUERY_CLONED_APPS"/>
         <permission name="android.permission.GET_BINDING_UID_IMPORTANCE"/>
+        <!-- Permission required for CTS test NotificationManagerZenTest -->
+        <permission name="android.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS" />
     </privapp-permissions>
 
     <privapp-permissions package="com.android.statementservice">
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index b6a0c7b..d12d9d6 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -562,6 +562,9 @@
     <!-- Permissions required for CTS test - NotificationManagerTest -->
     <uses-permission android:name="android.permission.MANAGE_NOTIFICATION_LISTENERS" />
 
+    <!-- Permissions required for CTS test - NotificationManagerZenTest -->
+    <uses-permission android:name="android.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS" />
+
     <!-- Permissions required for CTS test - CtsContactsProviderTestCases -->
     <uses-permission android:name="android.contacts.permission.MANAGE_SIM_ACCOUNTS" />
     <uses-permission android:name="android.permission.SET_DEFAULT_ACCOUNT_FOR_CONTACTS" />
diff --git a/services/core/java/com/android/server/display/color/ColorDisplayService.java b/services/core/java/com/android/server/display/color/ColorDisplayService.java
index e3aa161..a313bcf 100644
--- a/services/core/java/com/android/server/display/color/ColorDisplayService.java
+++ b/services/core/java/com/android/server/display/color/ColorDisplayService.java
@@ -1745,8 +1745,8 @@
 
         @Override
         public boolean setSaturationLevel(int level) {
-            final boolean hasTransformsPermission = getContext()
-                    .checkCallingPermission(Manifest.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS)
+            final boolean hasTransformsPermission = getContext().checkCallingOrSelfPermission(
+                    Manifest.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS)
                     == PackageManager.PERMISSION_GRANTED;
             final boolean hasLegacyPermission = getContext()
                     .checkCallingPermission(Manifest.permission.CONTROL_DISPLAY_SATURATION)
diff --git a/services/core/java/com/android/server/notification/DefaultDeviceEffectsApplier.java b/services/core/java/com/android/server/notification/DefaultDeviceEffectsApplier.java
new file mode 100644
index 0000000..9fdeda4
--- /dev/null
+++ b/services/core/java/com/android/server/notification/DefaultDeviceEffectsApplier.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.notification;
+
+import android.app.UiModeManager;
+import android.app.WallpaperManager;
+import android.content.Context;
+import android.hardware.display.ColorDisplayManager;
+import android.os.Binder;
+import android.os.PowerManager;
+import android.service.notification.DeviceEffectsApplier;
+import android.service.notification.ZenDeviceEffects;
+
+/** Default implementation for {@link DeviceEffectsApplier}. */
+class DefaultDeviceEffectsApplier implements DeviceEffectsApplier {
+
+    private static final String SUPPRESS_AMBIENT_DISPLAY_TOKEN =
+            "DefaultDeviceEffectsApplier:SuppressAmbientDisplay";
+    private static final int SATURATION_LEVEL_GRAYSCALE = 0;
+    private static final int SATURATION_LEVEL_FULL_COLOR = 100;
+    private static final float WALLPAPER_DIM_AMOUNT_DIMMED = 0.6f;
+    private static final float WALLPAPER_DIM_AMOUNT_NORMAL = 0f;
+
+    private final ColorDisplayManager mColorDisplayManager;
+    private final PowerManager mPowerManager;
+    private final UiModeManager mUiModeManager;
+    private final WallpaperManager mWallpaperManager;
+
+    DefaultDeviceEffectsApplier(Context context) {
+        mColorDisplayManager = context.getSystemService(ColorDisplayManager.class);
+        mPowerManager = context.getSystemService(PowerManager.class);
+        mUiModeManager = context.getSystemService(UiModeManager.class);
+        mWallpaperManager = context.getSystemService(WallpaperManager.class);
+    }
+
+    @Override
+    public void apply(ZenDeviceEffects effects) {
+        Binder.withCleanCallingIdentity(() -> {
+            mPowerManager.suppressAmbientDisplay(SUPPRESS_AMBIENT_DISPLAY_TOKEN,
+                    effects.shouldSuppressAmbientDisplay());
+
+            if (mColorDisplayManager != null) {
+                mColorDisplayManager.setSaturationLevel(
+                        effects.shouldDisplayGrayscale() ? SATURATION_LEVEL_GRAYSCALE
+                                : SATURATION_LEVEL_FULL_COLOR);
+            }
+
+            if (mWallpaperManager != null) {
+                mWallpaperManager.setWallpaperDimAmount(
+                        effects.shouldDimWallpaper() ? WALLPAPER_DIM_AMOUNT_DIMMED
+                                : WALLPAPER_DIM_AMOUNT_NORMAL);
+            }
+
+            // TODO: b/308673343 - Apply dark theme (via UiModeManager) when screen is off.
+        });
+    }
+}
diff --git a/services/core/java/com/android/server/notification/NotificationManagerService.java b/services/core/java/com/android/server/notification/NotificationManagerService.java
index 3c6887c1..02845fb 100755
--- a/services/core/java/com/android/server/notification/NotificationManagerService.java
+++ b/services/core/java/com/android/server/notification/NotificationManagerService.java
@@ -2941,6 +2941,12 @@
             registerDeviceConfigChange();
             migrateDefaultNAS();
             maybeShowInitialReviewPermissionsNotification();
+
+            if (android.app.Flags.modesApi()) {
+                // Cannot be done earlier, as some services aren't ready until this point.
+                mZenModeHelper.setDeviceEffectsApplier(
+                        new DefaultDeviceEffectsApplier(getContext()));
+            }
         } else if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
             mSnoozeHelper.scheduleRepostsForPersistedNotifications(System.currentTimeMillis());
         } else if (phase == SystemService.PHASE_DEVICE_SPECIFIC_SERVICES_READY) {
diff --git a/services/core/java/com/android/server/notification/ZenModeHelper.java b/services/core/java/com/android/server/notification/ZenModeHelper.java
index 5c37eea..218519f 100644
--- a/services/core/java/com/android/server/notification/ZenModeHelper.java
+++ b/services/core/java/com/android/server/notification/ZenModeHelper.java
@@ -27,8 +27,8 @@
 
 import static com.android.internal.util.FrameworkStatsLog.DND_MODE_RULE;
 
-import android.annotation.IntDef;
 import android.annotation.DrawableRes;
+import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SuppressLint;
@@ -76,6 +76,7 @@
 import android.provider.Settings.Global;
 import android.service.notification.Condition;
 import android.service.notification.ConditionProviderService;
+import android.service.notification.DeviceEffectsApplier;
 import android.service.notification.ZenDeviceEffects;
 import android.service.notification.ZenModeConfig;
 import android.service.notification.ZenModeConfig.ZenRule;
@@ -175,6 +176,8 @@
 
     @VisibleForTesting protected int mZenMode;
     @VisibleForTesting protected NotificationManager.Policy mConsolidatedPolicy;
+    @GuardedBy("mConfigLock")
+    private ZenDeviceEffects mConsolidatedDeviceEffects = new ZenDeviceEffects.Builder().build();
     private int mUser = UserHandle.USER_SYSTEM;
 
     private final Object mConfigLock = new Object();
@@ -182,6 +185,8 @@
     @VisibleForTesting protected ZenModeConfig mConfig;
     @VisibleForTesting protected AudioManagerInternal mAudioManager;
     protected PackageManager mPm;
+    @GuardedBy("mConfigLock")
+    private DeviceEffectsApplier mDeviceEffectsApplier;
     private long mSuppressedEffects;
 
     public static final long SUPPRESSED_EFFECT_NOTIFICATIONS = 1;
@@ -189,7 +194,7 @@
     public static final long SUPPRESSED_EFFECT_ALL = SUPPRESSED_EFFECT_CALLS
             | SUPPRESSED_EFFECT_NOTIFICATIONS;
 
-    @VisibleForTesting protected boolean mIsBootComplete;
+    @VisibleForTesting protected boolean mIsSystemServicesReady;
 
     private String[] mPriorityOnlyDndExemptPackages;
 
@@ -285,10 +290,33 @@
         mPm = mContext.getPackageManager();
         mHandler.postMetricsTimer();
         cleanUpZenRules();
-        mIsBootComplete = true;
+        mIsSystemServicesReady = true;
         showZenUpgradeNotification(mZenMode);
     }
 
+    /**
+     * Set the {@link DeviceEffectsApplier} used to apply the consolidated effects.
+     *
+     * <p>If effects were calculated previously (for example, when we loaded a {@link ZenModeConfig}
+     * that includes activated rules), they will be applied immediately.
+     */
+    void setDeviceEffectsApplier(@NonNull DeviceEffectsApplier deviceEffectsApplier) {
+        if (!Flags.modesApi()) {
+            return;
+        }
+        ZenDeviceEffects consolidatedDeviceEffects;
+        synchronized (mConfigLock) {
+            if (mDeviceEffectsApplier != null) {
+                throw new IllegalStateException("Already set up a DeviceEffectsApplier!");
+            }
+            mDeviceEffectsApplier = deviceEffectsApplier;
+            consolidatedDeviceEffects = mConsolidatedDeviceEffects;
+        }
+        if (consolidatedDeviceEffects.hasEffects()) {
+            applyConsolidatedDeviceEffects();
+        }
+    }
+
     public void onUserSwitched(int user) {
         loadConfigForUser(user, "onUserSwitched");
     }
@@ -1349,7 +1377,7 @@
 
             mConfig = config;
             dispatchOnConfigChanged();
-            updateConsolidatedPolicy(reason);
+            updateAndApplyConsolidatedPolicyAndDeviceEffects(reason);
         }
         final String val = Integer.toString(config.hashCode());
         Global.putString(mContext.getContentResolver(), Global.ZEN_MODE_CONFIG_ETAG, val);
@@ -1398,7 +1426,7 @@
         ZenLog.traceSetZenMode(zen, reason);
         mZenMode = zen;
         setZenModeSetting(mZenMode);
-        updateConsolidatedPolicy(reason);
+        updateAndApplyConsolidatedPolicyAndDeviceEffects(reason);
         boolean shouldApplyToRinger = setRingerMode && (zen != zenBefore || (
                 zen == Global.ZEN_MODE_IMPORTANT_INTERRUPTIONS
                         && policyHashBefore != mConsolidatedPolicy.hashCode()));
@@ -1459,25 +1487,56 @@
         }
     }
 
-    private void updateConsolidatedPolicy(String reason) {
+    private void updateAndApplyConsolidatedPolicyAndDeviceEffects(String reason) {
         synchronized (mConfigLock) {
             if (mConfig == null) return;
             ZenPolicy policy = new ZenPolicy();
+            ZenDeviceEffects.Builder deviceEffectsBuilder = new ZenDeviceEffects.Builder();
             if (mConfig.manualRule != null) {
                 applyCustomPolicy(policy, mConfig.manualRule);
+                if (Flags.modesApi()) {
+                    deviceEffectsBuilder.add(mConfig.manualRule.zenDeviceEffects);
+                }
             }
 
             for (ZenRule automaticRule : mConfig.automaticRules.values()) {
                 if (automaticRule.isAutomaticActive()) {
                     applyCustomPolicy(policy, automaticRule);
+                    if (Flags.modesApi()) {
+                        deviceEffectsBuilder.add(automaticRule.zenDeviceEffects);
+                    }
                 }
             }
+
             Policy newPolicy = mConfig.toNotificationPolicy(policy);
             if (!Objects.equals(mConsolidatedPolicy, newPolicy)) {
                 mConsolidatedPolicy = newPolicy;
                 dispatchOnConsolidatedPolicyChanged();
                 ZenLog.traceSetConsolidatedZenPolicy(mConsolidatedPolicy, reason);
             }
+
+            if (Flags.modesApi()) {
+                ZenDeviceEffects deviceEffects = deviceEffectsBuilder.build();
+                if (!deviceEffects.equals(mConsolidatedDeviceEffects)) {
+                    mConsolidatedDeviceEffects = deviceEffects;
+                    mHandler.postApplyDeviceEffects();
+                }
+            }
+        }
+    }
+
+    private void applyConsolidatedDeviceEffects() {
+        if (!Flags.modesApi()) {
+            return;
+        }
+        DeviceEffectsApplier applier;
+        ZenDeviceEffects effects;
+        synchronized (mConfigLock) {
+            applier = mDeviceEffectsApplier;
+            effects = mConsolidatedDeviceEffects;
+        }
+        if (applier != null) {
+            applier.apply(effects);
         }
     }
 
@@ -1893,7 +1952,7 @@
     private void showZenUpgradeNotification(int zen) {
         final boolean isWatch = mContext.getPackageManager().hasSystemFeature(
             PackageManager.FEATURE_WATCH);
-        final boolean showNotification = mIsBootComplete
+        final boolean showNotification = mIsSystemServicesReady
                 && zen != Global.ZEN_MODE_OFF
                 && !isWatch
                 && Settings.Secure.getInt(mContext.getContentResolver(),
@@ -2067,6 +2126,7 @@
         private static final int MSG_DISPATCH = 1;
         private static final int MSG_METRICS = 2;
         private static final int MSG_RINGER_AUDIO = 5;
+        private static final int MSG_APPLY_EFFECTS = 6;
 
         private static final long METRICS_PERIOD_MS = 6 * 60 * 60 * 1000;
 
@@ -2089,6 +2149,11 @@
             sendMessage(obtainMessage(MSG_RINGER_AUDIO, shouldApplyToRinger));
         }
 
+        private void postApplyDeviceEffects() {
+            removeMessages(MSG_APPLY_EFFECTS);
+            sendEmptyMessage(MSG_APPLY_EFFECTS);
+        }
+
         @Override
         public void handleMessage(Message msg) {
             switch (msg.what) {
@@ -2101,6 +2166,10 @@
                 case MSG_RINGER_AUDIO:
                     boolean shouldApplyToRinger = (boolean) msg.obj;
                     updateRingerAndAudio(shouldApplyToRinger);
+                    break;
+                case MSG_APPLY_EFFECTS:
+                    applyConsolidatedDeviceEffects();
+                    break;
             }
         }
     }
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/DefaultDeviceEffectsApplierTest.java b/services/tests/uiservicestests/src/com/android/server/notification/DefaultDeviceEffectsApplierTest.java
new file mode 100644
index 0000000..5febd02
--- /dev/null
+++ b/services/tests/uiservicestests/src/com/android/server/notification/DefaultDeviceEffectsApplierTest.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.notification;
+
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+import android.app.UiModeManager;
+import android.app.WallpaperManager;
+import android.hardware.display.ColorDisplayManager;
+import android.os.PowerManager;
+import android.platform.test.flag.junit.SetFlagsRule;
+import android.service.notification.ZenDeviceEffects;
+import android.testing.TestableContext;
+
+import androidx.test.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class DefaultDeviceEffectsApplierTest {
+
+    @Rule
+    public final SetFlagsRule mSetFlagsRule = new SetFlagsRule();
+
+    private TestableContext mContext;
+    private DefaultDeviceEffectsApplier mApplier;
+    @Mock PowerManager mPowerManager;
+    @Mock ColorDisplayManager mColorDisplayManager;
+    @Mock UiModeManager mUiModeManager;
+    @Mock WallpaperManager mWallpaperManager;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = new TestableContext(InstrumentationRegistry.getContext(), null);
+        mContext.addMockSystemService(PowerManager.class, mPowerManager);
+        mContext.addMockSystemService(ColorDisplayManager.class, mColorDisplayManager);
+        mContext.addMockSystemService(UiModeManager.class, mUiModeManager);
+        mContext.addMockSystemService(WallpaperManager.class, mWallpaperManager);
+
+        mApplier = new DefaultDeviceEffectsApplier(mContext);
+    }
+
+    @Test
+    public void apply_appliesEffects() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+
+        ZenDeviceEffects effects = new ZenDeviceEffects.Builder()
+                .setShouldSuppressAmbientDisplay(true)
+                .setShouldDimWallpaper(true)
+                .setShouldDisplayGrayscale(true)
+                .setShouldUseNightMode(true)
+                .build();
+        mApplier.apply(effects);
+
+        verify(mPowerManager).suppressAmbientDisplay(anyString(), eq(true));
+        verify(mColorDisplayManager).setSaturationLevel(eq(0));
+        verify(mWallpaperManager).setWallpaperDimAmount(eq(0.6f));
+        verifyZeroInteractions(mUiModeManager); // Coming later; adding now so test fails then. :)
+    }
+
+    @Test
+    public void apply_removesEffects() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+
+        ZenDeviceEffects noEffects = new ZenDeviceEffects.Builder().build();
+        mApplier.apply(noEffects);
+
+        verify(mPowerManager).suppressAmbientDisplay(anyString(), eq(false));
+        verify(mColorDisplayManager).setSaturationLevel(eq(100));
+        verify(mWallpaperManager).setWallpaperDimAmount(eq(0.0f));
+        verifyZeroInteractions(mUiModeManager);
+    }
+
+    @Test
+    public void apply_missingSomeServices_okay() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+        mContext.addMockSystemService(ColorDisplayManager.class, null);
+        mContext.addMockSystemService(WallpaperManager.class, null);
+
+        ZenDeviceEffects effects = new ZenDeviceEffects.Builder()
+                .setShouldSuppressAmbientDisplay(true)
+                .setShouldDimWallpaper(true)
+                .setShouldDisplayGrayscale(true)
+                .setShouldUseNightMode(true)
+                .build();
+        mApplier.apply(effects);
+
+        verify(mPowerManager).suppressAmbientDisplay(anyString(), eq(true));
+        // (And no crash from missing services).
+    }
+}
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java b/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
index b1fdec9..ef6fced 100644
--- a/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
+++ b/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
@@ -77,9 +77,9 @@
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.notNull;
 import static org.mockito.Mockito.reset;
-import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;
 import static org.mockito.Mockito.withSettings;
 
@@ -112,6 +112,7 @@
 import android.provider.Settings;
 import android.provider.Settings.Global;
 import android.service.notification.Condition;
+import android.service.notification.DeviceEffectsApplier;
 import android.service.notification.ZenDeviceEffects;
 import android.service.notification.ZenModeConfig;
 import android.service.notification.ZenModeConfig.ScheduleInfo;
@@ -188,8 +189,10 @@
             .appendPath("test")
             .build();
 
-    private static final Condition CONDITION = new Condition(CONDITION_ID, "",
+    private static final Condition CONDITION_TRUE = new Condition(CONDITION_ID, "",
             Condition.STATE_TRUE);
+    private static final Condition CONDITION_FALSE = new Condition(CONDITION_ID, "",
+            Condition.STATE_FALSE);
     private static final String TRIGGER_DESC = "Every Night, 10pm to 6am";
     private static final int TYPE = TYPE_BEDTIME;
     private static final boolean ALLOW_MANUAL = true;
@@ -201,6 +204,7 @@
             = NotificationManager.INTERRUPTION_FILTER_ALARMS;
     private static final boolean ENABLED = true;
     private static final int CREATION_TIME = 123;
+    private static final ZenDeviceEffects NO_EFFECTS = new ZenDeviceEffects.Builder().build();
 
     @Rule
     public final SetFlagsRule mSetFlagsRule = new SetFlagsRule();
@@ -212,6 +216,7 @@
     private TestableLooper mTestableLooper;
     private ZenModeHelper mZenModeHelper;
     private ContentResolver mContentResolver;
+    @Mock DeviceEffectsApplier mDeviceEffectsApplier;
     @Mock AppOpsManager mAppOps;
     TestableFlagResolver mTestFlagResolver = new TestableFlagResolver();
     ZenModeEventLoggerFake mZenModeEventLogger;
@@ -238,8 +243,9 @@
         when(mPackageManager.getResourcesForApplication(anyString())).thenReturn(
                 mResources);
 
-        when(mContext.getSystemService(AppOpsManager.class)).thenReturn(mAppOps);
-        when(mContext.getSystemService(NotificationManager.class)).thenReturn(mNotificationManager);
+        mContext.addMockSystemService(AppOpsManager.class, mAppOps);
+        mContext.addMockSystemService(NotificationManager.class, mNotificationManager);
+
         mConditionProviders = new ConditionProviders(mContext, new UserProfiles(),
                 AppGlobals.getPackageManager());
         mConditionProviders.addSystemProvider(new CountdownConditionProvider());
@@ -609,7 +615,7 @@
         // and we're setting zen mode on
         Settings.Secure.putInt(mContentResolver, Settings.Secure.SHOW_ZEN_UPGRADE_NOTIFICATION, 1);
         Settings.Secure.putInt(mContentResolver, Settings.Secure.ZEN_SETTINGS_UPDATED, 0);
-        mZenModeHelper.mIsBootComplete = true;
+        mZenModeHelper.mIsSystemServicesReady = true;
         mZenModeHelper.mConsolidatedPolicy = new Policy(0, 0, 0, 0, 0, 0);
         mZenModeHelper.setZenModeSetting(ZEN_MODE_IMPORTANT_INTERRUPTIONS);
 
@@ -624,7 +630,7 @@
         // doesn't show upgrade notification if stored settings says don't show
         Settings.Secure.putInt(mContentResolver, Settings.Secure.SHOW_ZEN_UPGRADE_NOTIFICATION, 0);
         Settings.Secure.putInt(mContentResolver, Settings.Secure.ZEN_SETTINGS_UPDATED, 0);
-        mZenModeHelper.mIsBootComplete = true;
+        mZenModeHelper.mIsSystemServicesReady = true;
         mZenModeHelper.setZenModeSetting(ZEN_MODE_IMPORTANT_INTERRUPTIONS);
 
         verify(mNotificationManager, never()).notify(eq(ZenModeHelper.TAG),
@@ -636,7 +642,7 @@
         // doesn't show upgrade notification since zen was already updated
         Settings.Secure.putInt(mContentResolver, Settings.Secure.SHOW_ZEN_UPGRADE_NOTIFICATION, 0);
         Settings.Secure.putInt(mContentResolver, Settings.Secure.ZEN_SETTINGS_UPDATED, 1);
-        mZenModeHelper.mIsBootComplete = true;
+        mZenModeHelper.mIsSystemServicesReady = true;
         mZenModeHelper.setZenModeSetting(ZEN_MODE_IMPORTANT_INTERRUPTIONS);
 
         verify(mNotificationManager, never()).notify(eq(ZenModeHelper.TAG),
@@ -3060,7 +3066,7 @@
         rule.configurationActivity = CONFIG_ACTIVITY;
         rule.component = OWNER;
         rule.conditionId = CONDITION_ID;
-        rule.condition = CONDITION;
+        rule.condition = CONDITION_TRUE;
         rule.enabled = ENABLED;
         rule.creationTime = 123;
         rule.id = "id";
@@ -3350,6 +3356,84 @@
     }
 
     @Test
+    public void testDeviceEffects_applied() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+        mZenModeHelper.setDeviceEffectsApplier(mDeviceEffectsApplier);
+
+        ZenDeviceEffects effects = new ZenDeviceEffects.Builder()
+                .setShouldSuppressAmbientDisplay(true)
+                .setShouldDimWallpaper(true)
+                .build();
+        String ruleId = addRuleWithEffects(effects);
+        verify(mDeviceEffectsApplier, never()).apply(any());
+
+        mZenModeHelper.setAutomaticZenRuleState(ruleId, CONDITION_TRUE, CUSTOM_PKG_UID, false);
+        mTestableLooper.processAllMessages();
+
+        verify(mDeviceEffectsApplier).apply(eq(effects));
+    }
+
+    @Test
+    public void testDeviceEffects_onDeactivateRule_applied() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+        mZenModeHelper.setDeviceEffectsApplier(mDeviceEffectsApplier);
+
+        ZenDeviceEffects zde = new ZenDeviceEffects.Builder().setShouldUseNightMode(true).build();
+        String ruleId = addRuleWithEffects(zde);
+        mZenModeHelper.setAutomaticZenRuleState(ruleId, CONDITION_TRUE, CUSTOM_PKG_UID, false);
+        mTestableLooper.processAllMessages();
+        verify(mDeviceEffectsApplier).apply(eq(zde));
+
+        mZenModeHelper.setAutomaticZenRuleState(ruleId, CONDITION_FALSE, CUSTOM_PKG_UID, false);
+        mTestableLooper.processAllMessages();
+
+        verify(mDeviceEffectsApplier).apply(eq(NO_EFFECTS));
+    }
+
+    @Test
+    public void testDeviceEffects_noChangeToConsolidatedEffects_notApplied() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+        mZenModeHelper.setDeviceEffectsApplier(mDeviceEffectsApplier);
+
+        ZenDeviceEffects zde = new ZenDeviceEffects.Builder().setShouldUseNightMode(true).build();
+        String ruleId = addRuleWithEffects(zde);
+        mZenModeHelper.setAutomaticZenRuleState(ruleId, CONDITION_TRUE, CUSTOM_PKG_UID, false);
+        mTestableLooper.processAllMessages();
+        verify(mDeviceEffectsApplier).apply(eq(zde));
+
+        // Now create and activate a second rule that doesn't add any more effects.
+        String secondRuleId = addRuleWithEffects(zde);
+        mZenModeHelper.setAutomaticZenRuleState(secondRuleId, CONDITION_TRUE, CUSTOM_PKG_UID,
+                false);
+        mTestableLooper.processAllMessages();
+
+        verifyNoMoreInteractions(mDeviceEffectsApplier);
+    }
+
+    @Test
+    public void testDeviceEffects_activeBeforeApplierProvided_appliedWhenProvided() {
+        mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
+
+        ZenDeviceEffects zde = new ZenDeviceEffects.Builder().setShouldUseNightMode(true).build();
+        String ruleId = addRuleWithEffects(zde);
+        verify(mDeviceEffectsApplier, never()).apply(any());
+
+        mZenModeHelper.setAutomaticZenRuleState(ruleId, CONDITION_TRUE, CUSTOM_PKG_UID, false);
+        mTestableLooper.processAllMessages();
+        verify(mDeviceEffectsApplier, never()).apply(any());
+
+        mZenModeHelper.setDeviceEffectsApplier(mDeviceEffectsApplier);
+        verify(mDeviceEffectsApplier).apply(eq(zde));
+    }
+
+    private String addRuleWithEffects(ZenDeviceEffects effects) {
+        AutomaticZenRule rule = new AutomaticZenRule.Builder("Test", CONDITION_ID)
+                .setDeviceEffects(effects)
+                .build();
+        return mZenModeHelper.addAutomaticZenRule("pkg", rule, "", CUSTOM_PKG_UID, FROM_APP);
+    }
+
+    @Test
     public void applyGlobalZenModeAsImplicitZenRule_createsImplicitRuleAndActivatesIt() {
         mSetFlagsRule.enableFlags(android.app.Flags.FLAG_MODES_API);
         mZenModeHelper.mConfig.automaticRules.clear();