diff --git a/services/core/java/com/android/server/inputmethod/InputMethodManagerInternal.java b/services/core/java/com/android/server/inputmethod/InputMethodManagerInternal.java
index 9c421524d723d..9f76e1ed113df 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodManagerInternal.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodManagerInternal.java
@@ -33,6 +33,16 @@ import java.util.List;
  * Input method manager local system service interface.
  */
 public abstract class InputMethodManagerInternal {
+    /**
+     * Listener for input method list changed events.
+     */
+    public interface InputMethodListListener {
+        /**
+         * Called with the list of the installed IMEs when it's updated.
+         */
+        void onInputMethodListUpdated(List<InputMethodInfo> info, @UserIdInt int userId);
+    }
+
     /**
      * Called by the power manager to tell the input method manager whether it
      * should start watching for wake events.
@@ -84,6 +94,11 @@ public abstract class InputMethodManagerInternal {
      */
     public abstract boolean switchToInputMethod(String imeId, @UserIdInt int userId);
 
+    /**
+     * Registers a new {@link InputMethodListListener}.
+     */
+    public abstract void registerInputMethodListListener(InputMethodListListener listener);
+
     /**
      * Fake implementation of {@link InputMethodManagerInternal}.  All the methods do nothing.
      */
@@ -117,6 +132,10 @@ public abstract class InputMethodManagerInternal {
                 public boolean switchToInputMethod(String imeId, int userId) {
                     return false;
                 }
+
+                @Override
+                public void registerInputMethodListListener(InputMethodListListener listener) {
+                }
             };
 
     /**
diff --git a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
index 15698e9795ec6..47622f38f3f22 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
@@ -154,6 +154,7 @@ import com.android.internal.view.InputBindResult;
 import com.android.server.EventLogTags;
 import com.android.server.LocalServices;
 import com.android.server.SystemService;
+import com.android.server.inputmethod.InputMethodManagerInternal.InputMethodListListener;
 import com.android.server.inputmethod.InputMethodSubtypeSwitchingController.ImeSubtypeListItem;
 import com.android.server.inputmethod.InputMethodUtils.InputMethodSettings;
 import com.android.server.statusbar.StatusBarManagerService;
@@ -172,6 +173,7 @@ import java.util.Date;
 import java.util.List;
 import java.util.Locale;
 import java.util.WeakHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
@@ -214,6 +216,7 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
     static final int MSG_HARD_KEYBOARD_SWITCH_CHANGED = 4000;
 
     static final int MSG_SYSTEM_UNLOCK_USER = 5000;
+    static final int MSG_DISPATCH_ON_INPUT_METHOD_LIST_UPDATED = 5010;
 
     static final int MSG_INLINE_SUGGESTIONS_REQUEST = 6000;
 
@@ -688,6 +691,13 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
     private final IPackageManager mIPackageManager;
     private final String mSlotIme;
 
+    /**
+     * Registered {@link InputMethodListListeners}.
+     * This variable can be accessed from both of MainThread and BinderThread.
+     */
+    private final CopyOnWriteArrayList<InputMethodListListener> mInputMethodListListeners =
+            new CopyOnWriteArrayList<>();
+
     /**
      * Internal state snapshot when {@link #MSG_START_INPUT} message is about to be posted to the
      * internal message queue. Any subsequent state change inside {@link InputMethodManagerService}
@@ -3946,10 +3956,18 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
             case MSG_HARD_KEYBOARD_SWITCH_CHANGED:
                 mHardKeyboardListener.handleHardKeyboardStatusChange(msg.arg1 == 1);
                 return true;
-            case MSG_SYSTEM_UNLOCK_USER:
+            case MSG_SYSTEM_UNLOCK_USER: {
                 final int userId = msg.arg1;
                 onUnlockUser(userId);
                 return true;
+            }
+            case MSG_DISPATCH_ON_INPUT_METHOD_LIST_UPDATED: {
+                final int userId = msg.arg1;
+                final List<InputMethodInfo> imes = (List<InputMethodInfo>) msg.obj;
+                mInputMethodListListeners.forEach(
+                        listener -> listener.onInputMethodListUpdated(imes, userId));
+                return true;
+            }
 
             // ---------------------------------------------------------------
             case MSG_INLINE_SUGGESTIONS_REQUEST:
@@ -4142,6 +4160,11 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
         // TODO: Make sure that mSwitchingController and mSettings are sharing the
         // the same enabled IMEs list.
         mSwitchingController.resetCircularListLocked(mContext);
+
+        // Notify InputMethodListListeners of the new installed InputMethods.
+        final List<InputMethodInfo> inputMethodList = new ArrayList<>(mMethodList);
+        mHandler.obtainMessage(MSG_DISPATCH_ON_INPUT_METHOD_LIST_UPDATED,
+                mSettings.getCurrentUserId(), 0 /* unused */, inputMethodList).sendToTarget();
     }
 
     // ----------------------------------------------------------------------
@@ -4606,6 +4629,11 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
         public boolean switchToInputMethod(String imeId, int userId) {
             return mService.switchToInputMethod(imeId, userId);
         }
+
+        @Override
+        public void registerInputMethodListListener(InputMethodListListener listener) {
+            mService.mInputMethodListListeners.addIfAbsent(listener);
+        }
     }
 
     @BinderThread
diff --git a/services/core/java/com/android/server/inputmethod/MultiClientInputMethodManagerService.java b/services/core/java/com/android/server/inputmethod/MultiClientInputMethodManagerService.java
index d09c478e320f3..54af69432ee0e 100644
--- a/services/core/java/com/android/server/inputmethod/MultiClientInputMethodManagerService.java
+++ b/services/core/java/com/android/server/inputmethod/MultiClientInputMethodManagerService.java
@@ -207,6 +207,12 @@ public final class MultiClientInputMethodManagerService {
                             reportNotSupported();
                             return false;
                         }
+
+                        @Override
+                        public void registerInputMethodListListener(
+                                InputMethodListListener listener) {
+                            reportNotSupported();
+                        }
                     });
         }