diff --git a/services/core/java/com/android/server/inputmethod/InputMethodBindingController.java b/services/core/java/com/android/server/inputmethod/InputMethodBindingController.java
index 3af51f4ba55f4..db13deba1972b 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodBindingController.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodBindingController.java
@@ -18,8 +18,6 @@ package com.android.server.inputmethod;
 
 import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;
 
-import static com.android.server.inputmethod.InputMethodManagerService.MSG_INITIALIZE_IME;
-
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.app.PendingIntent;
@@ -311,11 +309,8 @@ final class InputMethodBindingController {
                     if (DEBUG) Slog.v(TAG, "Initiating attach with token: " + mCurToken);
                     final InputMethodInfo info = mMethodMap.get(mSelectedMethodId);
                     mSupportsStylusHw = info.supportsStylusHandwriting();
-                    // Dispatch display id for InputMethodService to update context display.
-                    mService.executeOrSendMessage(mCurMethod,
-                            mService.mCaller.obtainMessageIOOO(MSG_INITIALIZE_IME,
-                                    info.getConfigChanges(), mCurMethod, mCurToken,
-                                    mSupportsStylusHw));
+                    mService.executeOrSendInitializeIme(mCurMethod, mCurToken,
+                            info.getConfigChanges(), mSupportsStylusHw);
                     mService.scheduleNotifyImeUidToAudioService(mCurMethodUid);
                     mService.reRequestCurrentClientSessionLocked();
                 }
diff --git a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
index 254fc0aad48e4..6c68011bf31ad 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
@@ -228,10 +228,7 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
     private static final int MSG_SHOW_SOFT_INPUT = 1020;
     private static final int MSG_HIDE_SOFT_INPUT = 1030;
     private static final int MSG_HIDE_CURRENT_INPUT_METHOD = 1035;
-    /**
-     * package-private because this is also used by {@link InputMethodBindingController}.
-     */
-    static final int MSG_INITIALIZE_IME = 1040;
+    private static final int MSG_INITIALIZE_IME = 1040;
     private static final int MSG_CREATE_SESSION = 1050;
     private static final int MSG_REMOVE_IME_SURFACE = 1060;
     private static final int MSG_REMOVE_IME_SURFACE_FROM_WINDOW = 1061;
@@ -288,7 +285,7 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
     final WindowManagerInternal mWindowManagerInternal;
     final PackageManagerInternal mPackageManagerInternal;
     final InputManagerInternal mInputManagerInternal;
-    final HandlerCaller mCaller;
+    private final HandlerCaller mCaller;
     final boolean mHasFeature;
     private final ArrayMap<String, List<InputMethodSubtype>> mAdditionalSubtypeMap =
             new ArrayMap<>();
@@ -2244,7 +2241,7 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
         }
     }
 
-    void executeOrSendMessage(IInterface target, Message msg) {
+    private void executeOrSendMessage(IInterface target, Message msg) {
          if (target.asBinder() instanceof Binder) {
              mCaller.sendMessage(msg);
          } else {
@@ -2529,6 +2526,13 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
         }
     }
 
+    @AnyThread
+    void executeOrSendInitializeIme(@NonNull IInputMethod inputMethod, @NonNull IBinder token,
+            @android.content.pm.ActivityInfo.Config int configChanges, boolean supportStylusHw) {
+        executeOrSendMessage(inputMethod, mCaller.obtainMessageIOOO(MSG_INITIALIZE_IME,
+                configChanges, inputMethod, token, supportStylusHw));
+    }
+
     @AnyThread
     void scheduleNotifyImeUidToAudioService(int uid) {
         mCaller.removeMessages(MSG_NOTIFY_IME_UID_TO_AUDIO_SERVICE);