diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index a2a9578b15ce3..aaf371f83421f 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -10416,11 +10416,11 @@ package android.service.translation {
     ctor public TranslationService();
     method @Nullable public final android.os.IBinder onBind(@NonNull android.content.Intent);
     method public void onConnected();
-    method public void onCreateTranslationSession(@NonNull android.view.translation.TranslationContext, int, @NonNull java.util.function.Consumer<java.lang.Boolean>);
+    method public abstract void onCreateTranslationSession(@NonNull android.view.translation.TranslationContext, int, @NonNull java.util.function.Consumer<java.lang.Boolean>);
     method public void onDisconnected();
     method public abstract void onFinishTranslationSession(int);
     method public abstract void onTranslationCapabilitiesRequest(int, int, @NonNull java.util.function.Consumer<java.util.Set<android.view.translation.TranslationCapability>>);
-    method public void onTranslationRequest(@NonNull android.view.translation.TranslationRequest, int, @Nullable android.os.CancellationSignal, @NonNull java.util.function.Consumer<android.view.translation.TranslationResponse>);
+    method public abstract void onTranslationRequest(@NonNull android.view.translation.TranslationRequest, int, @Nullable android.os.CancellationSignal, @NonNull java.util.function.Consumer<android.view.translation.TranslationResponse>);
     method public final void updateTranslationCapability(@NonNull android.view.translation.TranslationCapability);
     field public static final String SERVICE_INTERFACE = "android.service.translation.TranslationService";
     field public static final String SERVICE_META_DATA = "android.translation_service";
diff --git a/core/java/android/service/translation/TranslationService.java b/core/java/android/service/translation/TranslationService.java
index 2f704f46ab74c..e1d4a5656b395 100644
--- a/core/java/android/service/translation/TranslationService.java
+++ b/core/java/android/service/translation/TranslationService.java
@@ -230,12 +230,8 @@ public abstract class TranslationService extends Service {
      */
     // TODO(b/176464808): the session id won't be unique cross client/server process. Need to find
     // solution to make it's safe.
-    // TODO: make abstract once aiai is implemented.
-    public void onCreateTranslationSession(@NonNull TranslationContext translationContext,
-            int sessionId, @NonNull Consumer<Boolean> callback) {
-        onCreateTranslationSession(translationContext, sessionId);
-        callback.accept(true);
-    }
+    public abstract void onCreateTranslationSession(@NonNull TranslationContext translationContext,
+            int sessionId, @NonNull Consumer<Boolean> callback);
 
     /**
      * TODO: fill in javadoc.
@@ -285,23 +281,9 @@ public abstract class TranslationService extends Service {
      * @param callback
      * @param cancellationSignal
      */
-    //TODO: make abstract once aiai transitions.
-    public void onTranslationRequest(@NonNull TranslationRequest request, int sessionId,
+    public abstract void onTranslationRequest(@NonNull TranslationRequest request, int sessionId,
             @Nullable CancellationSignal cancellationSignal,
-            @NonNull Consumer<TranslationResponse> callback) {
-        onTranslationRequest(request, sessionId, cancellationSignal,
-                new OnTranslationResultCallback() {
-                    @Override
-                    public void onTranslationSuccess(@NonNull TranslationResponse response) {
-                        callback.accept(response);
-                    }
-
-                    @Override
-                    public void onError() {
-                        // null-op
-                    }
-                });
-    }
+            @NonNull Consumer<TranslationResponse> callback);
 
     /**
      * TODO: fill in javadoc