diff --git a/core/java/android/service/voice/AbstractHotwordDetector.java b/core/java/android/service/voice/AbstractHotwordDetector.java
index 01d5638461af8..305995a3d2b77 100644
--- a/core/java/android/service/voice/AbstractHotwordDetector.java
+++ b/core/java/android/service/voice/AbstractHotwordDetector.java
@@ -64,6 +64,13 @@ abstract class AbstractHotwordDetector implements HotwordDetector {
         mIsDetectorActive = new AtomicBoolean(true);
     }
 
+    /**
+     * Method to be called for the detector to ready/register itself with underlying system
+     * services.
+     */
+    abstract void initialize(@Nullable PersistableBundle options,
+            @Nullable SharedMemory sharedMemory);
+
     /**
      * Detect hotword from an externally supplied stream of data.
      *
diff --git a/core/java/android/service/voice/AlwaysOnHotwordDetector.java b/core/java/android/service/voice/AlwaysOnHotwordDetector.java
index bec5d1be57fd1..64b66b6a6d42e 100644
--- a/core/java/android/service/voice/AlwaysOnHotwordDetector.java
+++ b/core/java/android/service/voice/AlwaysOnHotwordDetector.java
@@ -279,7 +279,7 @@ public class AlwaysOnHotwordDetector extends AbstractHotwordDetector {
     private KeyphraseMetadata mKeyphraseMetadata;
     private final KeyphraseEnrollmentInfo mKeyphraseEnrollmentInfo;
     private final IVoiceInteractionManagerService mModelManagementService;
-    private final IVoiceInteractionSoundTriggerSession mSoundTriggerSession;
+    private IVoiceInteractionSoundTriggerSession mSoundTriggerSession;
     private final SoundTriggerListener mInternalCallback;
     private final Callback mExternalCallback;
     private final Handler mHandler;
@@ -788,8 +788,7 @@ public class AlwaysOnHotwordDetector extends AbstractHotwordDetector {
     public AlwaysOnHotwordDetector(String text, Locale locale, Callback callback,
             KeyphraseEnrollmentInfo keyphraseEnrollmentInfo,
             IVoiceInteractionManagerService modelManagementService, int targetSdkVersion,
-            boolean supportHotwordDetectionService, @Nullable PersistableBundle options,
-            @Nullable SharedMemory sharedMemory) {
+            boolean supportHotwordDetectionService) {
         super(modelManagementService, callback,
                 supportHotwordDetectionService ? DETECTOR_TYPE_TRUSTED_HOTWORD_DSP
                         : DETECTOR_TYPE_NORMAL);
@@ -803,6 +802,12 @@ public class AlwaysOnHotwordDetector extends AbstractHotwordDetector {
         mModelManagementService = modelManagementService;
         mTargetSdkVersion = targetSdkVersion;
         mSupportHotwordDetectionService = supportHotwordDetectionService;
+    }
+
+    @Override
+    void initialize(@Nullable PersistableBundle options, @Nullable SharedMemory sharedMemory) {
+        // TODO: transition to use an API that is not updateState to provide
+        //  onHotwordDetectionServiceInitialized status to external callback
         if (mSupportHotwordDetectionService) {
             updateStateLocked(options, sharedMemory, mInternalCallback,
                     DETECTOR_TYPE_TRUSTED_HOTWORD_DSP);
diff --git a/core/java/android/service/voice/SoftwareHotwordDetector.java b/core/java/android/service/voice/SoftwareHotwordDetector.java
index 2d662eaf0a4f0..cae9598978e9c 100644
--- a/core/java/android/service/voice/SoftwareHotwordDetector.java
+++ b/core/java/android/service/voice/SoftwareHotwordDetector.java
@@ -57,8 +57,6 @@ class SoftwareHotwordDetector extends AbstractHotwordDetector {
     SoftwareHotwordDetector(
             IVoiceInteractionManagerService managerService,
             AudioFormat audioFormat,
-            PersistableBundle options,
-            SharedMemory sharedMemory,
             HotwordDetector.Callback callback) {
         super(managerService, callback, DETECTOR_TYPE_TRUSTED_HOTWORD_SOFTWARE);
 
@@ -66,6 +64,12 @@ class SoftwareHotwordDetector extends AbstractHotwordDetector {
         mAudioFormat = audioFormat;
         mCallback = callback;
         mHandler = new Handler(Looper.getMainLooper());
+    }
+
+    @Override
+    void initialize(@Nullable PersistableBundle options, @Nullable SharedMemory sharedMemory) {
+        // TODO: transition to use an API that is not updateState to provide
+        //  onHotwordDetectionServiceInitialized status to external callback
         updateStateLocked(options, sharedMemory,
                 new InitializationStateListener(mHandler, mCallback),
                 DETECTOR_TYPE_TRUSTED_HOTWORD_SOFTWARE);
diff --git a/core/java/android/service/voice/VoiceInteractionService.java b/core/java/android/service/voice/VoiceInteractionService.java
index bf0cfbe49f31d..88b7a58a57098 100644
--- a/core/java/android/service/voice/VoiceInteractionService.java
+++ b/core/java/android/service/voice/VoiceInteractionService.java
@@ -381,12 +381,15 @@ public class VoiceInteractionService extends Service {
         synchronized (mLock) {
             // Allow only one concurrent recognition via the APIs.
             safelyShutdownAllHotwordDetectors();
-            mHotwordDetector = new AlwaysOnHotwordDetector(keyphrase, locale, callback,
+
+            mHotwordDetector = new AlwaysOnHotwordDetector(keyphrase, locale,
+                    callback,
                     mKeyphraseEnrollmentInfo, mSystemService,
                     getApplicationContext().getApplicationInfo().targetSdkVersion,
-                    supportHotwordDetectionService, options, sharedMemory);
+                    supportHotwordDetectionService);
             mHotwordDetector.registerOnDestroyListener((detector) -> onDspHotwordDetectorDestroyed(
                     (AlwaysOnHotwordDetector) detector));
+            mHotwordDetector.initialize(options, sharedMemory);
         }
         return mHotwordDetector;
     }
@@ -436,12 +439,14 @@ public class VoiceInteractionService extends Service {
         synchronized (mLock) {
             // Allow only one concurrent recognition via the APIs.
             safelyShutdownAllHotwordDetectors();
+
             mSoftwareHotwordDetector =
                     new SoftwareHotwordDetector(
-                            mSystemService, null, options, sharedMemory, callback);
+                            mSystemService, null, callback);
             mSoftwareHotwordDetector.registerOnDestroyListener(
                     (detector) -> onMicrophoneHotwordDetectorDestroyed(
                             (SoftwareHotwordDetector) detector));
+            mSoftwareHotwordDetector.initialize(options, sharedMemory);
         }
         return mSoftwareHotwordDetector;
     }