diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 19b72bfbe6c02..edaf8cf279e3a 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -2415,8 +2415,12 @@
     <!-- Is the system user the only user allowed to dream. -->
     <bool name="config_dreamsOnlyEnabledForSystemUser">false</bool>
 
+    <!-- Whether to dismiss the active dream when an activity is started. Doesn't apply to
+         assistant activities (ACTIVITY_TYPE_ASSISTANT) -->
+    <bool name="config_dismissDreamOnActivityStart">true</bool>
+
     <!-- The prefix of dream component names that are loggable. If empty, logs "other" for all. -->
-    <string name ="config_loggable_dream_prefix" translatable="false"></string>
+    <string name="config_loggable_dream_prefix" translatable="false"></string>
 
     <!-- ComponentName of a dream to show whenever the system would otherwise have
          gone to sleep.  When the PowerManager is asked to go to sleep, it will instead
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 012030e9b3934..8226ec4355330 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -2221,6 +2221,7 @@
   <java-symbol type="array" name="config_supportedDreamComplications" />
   <java-symbol type="array" name="config_dreamComplicationsEnabledByDefault" />
   <java-symbol type="array" name="config_disabledDreamComponents" />
+  <java-symbol type="bool" name="config_dismissDreamOnActivityStart" />
   <java-symbol type="string" name="config_loggable_dream_prefix" />
   <java-symbol type="string" name="config_dozeComponent" />
   <java-symbol type="string" name="enable_explore_by_touch_warning_title" />
diff --git a/services/core/java/com/android/server/dreams/DreamManagerService.java b/services/core/java/com/android/server/dreams/DreamManagerService.java
index f68d22acd6aba..4e1d899b26a67 100644
--- a/services/core/java/com/android/server/dreams/DreamManagerService.java
+++ b/services/core/java/com/android/server/dreams/DreamManagerService.java
@@ -17,13 +17,21 @@
 package com.android.server.dreams;
 
 import static android.Manifest.permission.BIND_DREAM_SERVICE;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_ASSISTANT;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_DREAM;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
 
+import static com.android.server.wm.ActivityInterceptorCallback.DREAM_MANAGER_ORDERED_ID;
+
+import android.annotation.Nullable;
 import android.app.ActivityManager;
+import android.app.TaskInfo;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ServiceInfo;
@@ -54,6 +62,7 @@ import com.android.internal.util.DumpUtils;
 import com.android.server.FgThread;
 import com.android.server.LocalServices;
 import com.android.server.SystemService;
+import com.android.server.wm.ActivityInterceptorCallback;
 import com.android.server.wm.ActivityTaskManagerInternal;
 
 import java.io.FileDescriptor;
@@ -83,6 +92,7 @@ public final class DreamManagerService extends SystemService {
     private final UiEventLogger mUiEventLogger;
     private final DreamUiEventLogger mDreamUiEventLogger;
     private final ComponentName mAmbientDisplayComponent;
+    private final boolean mDismissDreamOnActivityStart;
 
     private Binder mCurrentDreamToken;
     private ComponentName mCurrentDreamName;
@@ -99,6 +109,26 @@ public final class DreamManagerService extends SystemService {
     private ComponentName mDreamOverlayServiceName;
 
     private AmbientDisplayConfiguration mDozeConfig;
+    private final ActivityInterceptorCallback mActivityInterceptorCallback =
+            new ActivityInterceptorCallback() {
+                @Nullable
+                @Override
+                public ActivityInterceptResult intercept(ActivityInterceptorInfo info) {
+                    return null;
+                }
+
+                @Override
+                public void onActivityLaunched(TaskInfo taskInfo, ActivityInfo activityInfo,
+                        ActivityInterceptorInfo info) {
+                    final int activityType = taskInfo.getActivityType();
+                    final boolean activityAllowed = activityType == ACTIVITY_TYPE_HOME
+                            || activityType == ACTIVITY_TYPE_DREAM
+                            || activityType == ACTIVITY_TYPE_ASSISTANT;
+                    if (mCurrentDreamToken != null && !mCurrentDreamIsWaking && !activityAllowed) {
+                        stopDreamInternal(false, "activity starting: " + activityInfo.name);
+                    }
+                }
+            };
 
     public DreamManagerService(Context context) {
         super(context);
@@ -118,6 +148,8 @@ public final class DreamManagerService extends SystemService {
         mAmbientDisplayComponent = ComponentName.unflattenFromString(adc.ambientDisplayComponent());
         mDreamsOnlyEnabledForSystemUser =
                 mContext.getResources().getBoolean(R.bool.config_dreamsOnlyEnabledForSystemUser);
+        mDismissDreamOnActivityStart = mContext.getResources().getBoolean(
+                R.bool.config_dismissDreamOnActivityStart);
     }
 
     @Override
@@ -145,6 +177,12 @@ public final class DreamManagerService extends SystemService {
                     Settings.Secure.getUriFor(Settings.Secure.DOZE_DOUBLE_TAP_GESTURE), false,
                     mDozeEnabledObserver, UserHandle.USER_ALL);
             writePulseGestureEnabled();
+
+            if (mDismissDreamOnActivityStart) {
+                mAtmInternal.registerActivityStartInterceptor(
+                        DREAM_MANAGER_ORDERED_ID,
+                        mActivityInterceptorCallback);
+            }
         }
     }
 
diff --git a/services/core/java/com/android/server/wm/ActivityInterceptorCallback.java b/services/core/java/com/android/server/wm/ActivityInterceptorCallback.java
index 400460a1e656d..34483957ca12e 100644
--- a/services/core/java/com/android/server/wm/ActivityInterceptorCallback.java
+++ b/services/core/java/com/android/server/wm/ActivityInterceptorCallback.java
@@ -61,6 +61,7 @@ public abstract class ActivityInterceptorCallback {
             PERMISSION_POLICY_ORDERED_ID,
             INTENT_RESOLVER_ORDERED_ID,
             VIRTUAL_DEVICE_SERVICE_ORDERED_ID,
+            DREAM_MANAGER_ORDERED_ID,
             LAST_ORDERED_ID // Update this when adding new ids
     })
     @Retention(RetentionPolicy.SOURCE)
@@ -87,11 +88,16 @@ public abstract class ActivityInterceptorCallback {
      */
     public static final int VIRTUAL_DEVICE_SERVICE_ORDERED_ID = 3;
 
+    /**
+     * The identifier for {@link com.android.server.dreams.DreamManagerService} interceptor.
+     */
+    public static final int DREAM_MANAGER_ORDERED_ID = 4;
+
     /**
      * The final id, used by the framework to determine the valid range of ids. Update this when
      * adding new ids.
      */
-    static final int LAST_ORDERED_ID = VIRTUAL_DEVICE_SERVICE_ORDERED_ID;
+    static final int LAST_ORDERED_ID = DREAM_MANAGER_ORDERED_ID;
 
     /**
      * Data class for storing the various arguments needed for activity interception.