diff --git a/core/java/android/view/inputmethod/IInputMethodManagerGlobalInvoker.java b/core/java/android/view/inputmethod/IInputMethodManagerGlobalInvoker.java
index dc5e0e5..88ca2a4 100644
--- a/core/java/android/view/inputmethod/IInputMethodManagerGlobalInvoker.java
+++ b/core/java/android/view/inputmethod/IInputMethodManagerGlobalInvoker.java
@@ -66,6 +66,7 @@
 
     @Nullable
     private static volatile IImeTracker sTrackerServiceCache = null;
+    private static int sCurStartInputSeq = 0;
 
     /**
      * @return {@code true} if {@link IInputMethodManager} is available.
@@ -327,6 +328,7 @@
         }
     }
 
+    // TODO(b/293640003): Remove method once Flags.useZeroJankProxy() is enabled.
     @AnyThread
     @NonNull
     @RequiresPermission(value = Manifest.permission.INTERACT_ACROSS_USERS_FULL, conditional = true)
@@ -353,6 +355,41 @@
         }
     }
 
+    /**
+     * Returns a sequence number for startInput.
+     */
+    @AnyThread
+    @NonNull
+    @RequiresPermission(value = Manifest.permission.INTERACT_ACROSS_USERS_FULL, conditional = true)
+    static int startInputOrWindowGainedFocusAsync(@StartInputReason int startInputReason,
+            @NonNull IInputMethodClient client, @Nullable IBinder windowToken,
+            @StartInputFlags int startInputFlags,
+            @WindowManager.LayoutParams.SoftInputModeFlags int softInputMode,
+            @WindowManager.LayoutParams.Flags int windowFlags, @Nullable EditorInfo editorInfo,
+            @Nullable IRemoteInputConnection remoteInputConnection,
+            @Nullable IRemoteAccessibilityInputConnection remoteAccessibilityInputConnection,
+            int unverifiedTargetSdkVersion, @UserIdInt int userId,
+            @NonNull ImeOnBackInvokedDispatcher imeDispatcher) {
+        final IInputMethodManager service = getService();
+        if (service == null) {
+            return -1;
+        }
+        try {
+            service.startInputOrWindowGainedFocusAsync(startInputReason, client, windowToken,
+                    startInputFlags, softInputMode, windowFlags, editorInfo, remoteInputConnection,
+                    remoteAccessibilityInputConnection, unverifiedTargetSdkVersion, userId,
+                    imeDispatcher, advanceAngGetStartInputSequenceNumber());
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+        return sCurStartInputSeq;
+    }
+
+    private static int advanceAngGetStartInputSequenceNumber() {
+        return ++sCurStartInputSeq;
+    }
+
+
     @AnyThread
     static void showInputMethodPickerFromClient(@NonNull IInputMethodClient client,
             int auxiliarySubtypeMode) {
diff --git a/core/java/android/view/inputmethod/InputMethodManager.java b/core/java/android/view/inputmethod/InputMethodManager.java
index f4b09df..72125ba 100644
--- a/core/java/android/view/inputmethod/InputMethodManager.java
+++ b/core/java/android/view/inputmethod/InputMethodManager.java
@@ -321,6 +321,22 @@
     };
 
     /**
+     * A runnable that reports {@link InputConnection} opened event for calls to
+     * {@link IInputMethodManagerGlobalInvoker#startInputOrWindowGainedFocusAsync}.
+     */
+    private abstract static class ReportInputConnectionOpenedRunner implements Runnable {
+        /**
+         * Sequence number to track startInput requests to
+         * {@link IInputMethodManagerGlobalInvoker#startInputOrWindowGainedFocusAsync}
+         */
+        int mSequenceNum;
+        ReportInputConnectionOpenedRunner(int sequenceNum) {
+            this.mSequenceNum = sequenceNum;
+        }
+    }
+    private ReportInputConnectionOpenedRunner mReportInputConnectionOpenedRunner;
+
+    /**
      * Ensures that {@link #sInstance} becomes non-{@code null} for application that have directly
      * or indirectly relied on {@link #sInstance} via reflection or something like that.
      *
@@ -691,6 +707,7 @@
     private static final int MSG_UNBIND_ACCESSIBILITY_SERVICE = 12;
     private static final int MSG_SET_INTERACTIVE = 13;
     private static final int MSG_ON_SHOW_REQUESTED = 31;
+    private static final int MSG_START_INPUT_RESULT = 40;
 
     /**
      * Calling this will invalidate Local stylus handwriting availability Cache which
@@ -1045,7 +1062,7 @@
                     return;
                 }
                 case MSG_BIND: {
-                    final InputBindResult res = (InputBindResult)msg.obj;
+                    final InputBindResult res = (InputBindResult) msg.obj;
                     if (DEBUG) {
                         Log.i(TAG, "handleMessage: MSG_BIND " + res.sequence + "," + res.id);
                     }
@@ -1071,6 +1088,60 @@
                     startInputInner(StartInputReason.BOUND_TO_IMMS, null, 0, 0, 0);
                     return;
                 }
+
+                case MSG_START_INPUT_RESULT: {
+                    final InputBindResult res = (InputBindResult) msg.obj;
+                    final int startInputSeq = msg.arg1;
+                    if (res == null) {
+                        // IMMS logs .wtf already.
+                        return;
+                    }
+                    if (DEBUG) Log.v(TAG, "Starting input: Bind result=" + res);
+                    synchronized (mH) {
+                        if (res.id != null) {
+                            updateInputChannelLocked(res.channel);
+                            mCurMethod = res.method; // for @UnsupportedAppUsage
+                            mCurBindState = new BindState(res);
+                            mAccessibilityInputMethodSession.clear();
+                            if (res.accessibilitySessions != null) {
+                                for (int i = 0; i < res.accessibilitySessions.size(); i++) {
+                                    IAccessibilityInputMethodSessionInvoker wrapper =
+                                            IAccessibilityInputMethodSessionInvoker.createOrNull(
+                                                    res.accessibilitySessions.valueAt(i));
+                                    if (wrapper != null) {
+                                        mAccessibilityInputMethodSession.append(
+                                                res.accessibilitySessions.keyAt(i), wrapper);
+                                    }
+                                }
+                            }
+                            mCurId = res.id; // for @UnsupportedAppUsage
+                        } else if (res.channel != null && res.channel != mCurChannel) {
+                            res.channel.dispose();
+                        }
+                        switch (res.result) {
+                            case InputBindResult.ResultCode.ERROR_NOT_IME_TARGET_WINDOW:
+                                mRestartOnNextWindowFocus = true;
+                                mServedView = null;
+                                break;
+                        }
+                        if (mCompletions != null) {
+                            if (isImeSessionAvailableLocked()) {
+                                mCurBindState.mImeSession.displayCompletions(mCompletions);
+                            }
+                        }
+
+                        if (res != null
+                                && res.method != null
+                                && mServedView != null
+                                && mReportInputConnectionOpenedRunner != null
+                                && mReportInputConnectionOpenedRunner.mSequenceNum
+                                        == startInputSeq) {
+                            mReportInputConnectionOpenedRunner.run();
+                        }
+                        mReportInputConnectionOpenedRunner = null;
+                    }
+                    return;
+                }
                 case MSG_UNBIND: {
                     final int sequence = msg.arg1;
                     @UnbindReason
@@ -1322,6 +1393,12 @@
         }
 
         @Override
+        public void onStartInputResult(InputBindResult res, int startInputSeq) {
+            mH.obtainMessage(MSG_START_INPUT_RESULT, startInputSeq, -1 /* unused */, res)
+                    .sendToTarget();
+        }
+
+        @Override
         public void onBindAccessibilityService(InputBindResult res, int id) {
             mH.obtainMessage(MSG_BIND_ACCESSIBILITY_SERVICE, id, 0, res).sendToTarget();
         }
@@ -2010,6 +2087,7 @@
             mServedConnecting = false;
             clearConnectionLocked();
         }
+        mReportInputConnectionOpenedRunner = null;
         // Clear the back callbacks held by the ime dispatcher to avoid memory leaks.
         mImeDispatcher.clear();
     }
@@ -3080,14 +3158,52 @@
             final int targetUserId = editorInfo.targetInputMethodUser != null
                     ? editorInfo.targetInputMethodUser.getIdentifier() : UserHandle.myUserId();
             Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "IMM.startInputOrWindowGainedFocus");
-            res = IInputMethodManagerGlobalInvoker.startInputOrWindowGainedFocus(
-                    startInputReason, mClient, windowGainingFocus, startInputFlags,
-                    softInputMode, windowFlags, editorInfo, servedInputConnection,
-                    servedInputConnection == null ? null
-                            : servedInputConnection.asIRemoteAccessibilityInputConnection(),
-                    view.getContext().getApplicationInfo().targetSdkVersion, targetUserId,
-                    mImeDispatcher);
+
+            int startInputSeq = -1;
+            if (Flags.useZeroJankProxy()) {
+                // async result delivered via MSG_START_INPUT_RESULT.
+                startInputSeq = IInputMethodManagerGlobalInvoker.startInputOrWindowGainedFocusAsync(
+                        startInputReason, mClient, windowGainingFocus, startInputFlags,
+                        softInputMode, windowFlags, editorInfo, servedInputConnection,
+                        servedInputConnection == null ? null
+                                : servedInputConnection.asIRemoteAccessibilityInputConnection(),
+                        view.getContext().getApplicationInfo().targetSdkVersion, targetUserId,
+                        mImeDispatcher);
+            } else {
+                res = IInputMethodManagerGlobalInvoker.startInputOrWindowGainedFocus(
+                        startInputReason, mClient, windowGainingFocus, startInputFlags,
+                        softInputMode, windowFlags, editorInfo, servedInputConnection,
+                        servedInputConnection == null ? null
+                                : servedInputConnection.asIRemoteAccessibilityInputConnection(),
+                        view.getContext().getApplicationInfo().targetSdkVersion, targetUserId,
+                        mImeDispatcher);
+            }
             Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
+            if (Flags.useZeroJankProxy()) {
+                // Create a runnable for delayed notification to the app that the InputConnection is
+                // initialized and ready for use.
+                if (ic != null) {
+                    final int seqId = startInputSeq;
+                    mReportInputConnectionOpenedRunner =
+                            new ReportInputConnectionOpenedRunner(startInputSeq) {
+                                @Override
+                                public void run() {
+                                    if (DEBUG) {
+                                        Log.v(TAG, "Calling View.onInputConnectionOpened: view= "
+                                                + view
+                                                + ", ic=" + ic + ", editorInfo=" + editorInfo
+                                                + ", handler="
+                                                + icHandler + ", startInputSeq=" + seqId);
+                                    }
+                                    reportInputConnectionOpened(ic, editorInfo, icHandler, view);
+                                }
+                            };
+                } else {
+                    mReportInputConnectionOpenedRunner = null;
+                }
+                return true;
+            }
+
             if (DEBUG) Log.v(TAG, "Starting input: Bind result=" + res);
             if (res == null) {
                 Log.wtf(TAG, "startInputOrWindowGainedFocus must not return"
@@ -3118,6 +3234,7 @@
             } else if (res.channel != null && res.channel != mCurChannel) {
                 res.channel.dispose();
             }
+
             switch (res.result) {
                 case InputBindResult.ResultCode.ERROR_NOT_IME_TARGET_WINDOW:
                     mRestartOnNextWindowFocus = true;
diff --git a/core/java/com/android/internal/inputmethod/IInputMethodClient.aidl b/core/java/com/android/internal/inputmethod/IInputMethodClient.aidl
index 9251d2d..babd9a0 100644
--- a/core/java/com/android/internal/inputmethod/IInputMethodClient.aidl
+++ b/core/java/com/android/internal/inputmethod/IInputMethodClient.aidl
@@ -24,6 +24,7 @@
  */
 oneway interface IInputMethodClient {
     void onBindMethod(in InputBindResult res);
+    void onStartInputResult(in InputBindResult res, int startInputSeq);
     void onBindAccessibilityService(in InputBindResult res, int id);
     void onUnbindMethod(int sequence, int unbindReason);
     void onUnbindAccessibilityService(int sequence, int id);
diff --git a/core/java/com/android/internal/inputmethod/InputBindResult.java b/core/java/com/android/internal/inputmethod/InputBindResult.java
index b6eca07..243b103 100644
--- a/core/java/com/android/internal/inputmethod/InputBindResult.java
+++ b/core/java/com/android/internal/inputmethod/InputBindResult.java
@@ -271,6 +271,7 @@
     public String toString() {
         return "InputBindResult{result=" + getResultString() + " method=" + method + " id=" + id
                 + " sequence=" + sequence
+                + " result=" + result
                 + " isInputMethodSuppressingSpellChecker=" + isInputMethodSuppressingSpellChecker
                 + "}";
     }
diff --git a/core/java/com/android/internal/view/IInputMethodManager.aidl b/core/java/com/android/internal/view/IInputMethodManager.aidl
index e95127b..b90f8bf 100644
--- a/core/java/com/android/internal/view/IInputMethodManager.aidl
+++ b/core/java/com/android/internal/view/IInputMethodManager.aidl
@@ -69,6 +69,8 @@
     boolean hideSoftInput(in IInputMethodClient client, @nullable IBinder windowToken,
             in @nullable ImeTracker.Token statsToken, int flags,
             in @nullable ResultReceiver resultReceiver, int reason);
+
+    // TODO(b/293640003): Remove method once Flags.useZeroJankProxy() is enabled.
     // If windowToken is null, this just does startInput().  Otherwise this reports that a window
     // has gained focus, and if 'editorInfo' is non-null then also does startInput.
     // @NonNull
@@ -85,6 +87,21 @@
             int unverifiedTargetSdkVersion, int userId,
             in ImeOnBackInvokedDispatcher imeDispatcher);
 
+    // If windowToken is null, this just does startInput().  Otherwise this reports that a window
+    // has gained focus, and if 'editorInfo' is non-null then also does startInput.
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission(value = "
+            + "android.Manifest.permission.INTERACT_ACROSS_USERS_FULL, conditional = true)")
+    void startInputOrWindowGainedFocusAsync(
+            /* @StartInputReason */ int startInputReason,
+            in IInputMethodClient client, in @nullable IBinder windowToken,
+            /* @StartInputFlags */ int startInputFlags,
+            /* @android.view.WindowManager.LayoutParams.SoftInputModeFlags */ int softInputMode,
+            /* @android.view.WindowManager.LayoutParams.Flags */ int windowFlags,
+            in @nullable EditorInfo editorInfo, in @nullable IRemoteInputConnection inputConnection,
+            in @nullable IRemoteAccessibilityInputConnection remoteAccessibilityInputConnection,
+            int unverifiedTargetSdkVersion, int userId,
+            in ImeOnBackInvokedDispatcher imeDispatcher, int startInputSeq);
+
     void showInputMethodPickerFromClient(in IInputMethodClient client,
             int auxiliarySubtypeMode);
 
@@ -156,6 +173,7 @@
                 in String delegatePackageName,
                 in String delegatorPackageName);
 
+    // TODO(b/293640003): introduce a new API method to provide async way to return boolean.
     /** Accepts and starts a stylus handwriting session for the delegate view **/
     boolean acceptStylusHandwritingDelegation(in IInputMethodClient client, in int userId,
             in String delegatePackageName, in String delegatorPackageName, int flags);
diff --git a/services/core/java/com/android/server/inputmethod/IInputMethodClientInvoker.java b/services/core/java/com/android/server/inputmethod/IInputMethodClientInvoker.java
index 977dbff..84a59b4 100644
--- a/services/core/java/com/android/server/inputmethod/IInputMethodClientInvoker.java
+++ b/services/core/java/com/android/server/inputmethod/IInputMethodClientInvoker.java
@@ -117,6 +117,30 @@
     }
 
     @AnyThread
+    void onStartInputResult(@NonNull InputBindResult res, int startInputSeq) {
+        if (mIsProxy) {
+            onStartInputResultInternal(res, startInputSeq);
+        } else {
+            mHandler.post(() -> onStartInputResultInternal(res, startInputSeq));
+        }
+    }
+
+    @AnyThread
+    private void onStartInputResultInternal(@NonNull InputBindResult res, int startInputSeq) {
+        try {
+            mTarget.onStartInputResult(res, startInputSeq);
+        } catch (RemoteException e) {
+            logRemoteException(e);
+        } finally {
+            // Dispose the channel if the input method is not local to this process
+            // because the remote proxy will get its own copy when unparceled.
+            if (res.channel != null && mIsProxy) {
+                res.channel.dispose();
+            }
+        }
+    }
+
+    @AnyThread
     void onBindAccessibilityService(@NonNull InputBindResult res, int id) {
         if (mIsProxy) {
             onBindAccessibilityServiceInternal(res, id);
diff --git a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
index bc169ca..5574d18 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
@@ -1539,7 +1539,13 @@
         @Override
         public void onStart() {
             mService.publishLocalService();
-            publishBinderService(Context.INPUT_METHOD_SERVICE, mService, false /*allowIsolated*/,
+            IInputMethodManager.Stub service;
+            if (Flags.useZeroJankProxy()) {
+                service = new ZeroJankProxy(mService.mHandler::post, mService);
+            } else {
+                service = mService;
+            }
+            publishBinderService(Context.INPUT_METHOD_SERVICE, service, false /*allowIsolated*/,
                     DUMP_FLAG_PRIORITY_CRITICAL | DUMP_FLAG_PRIORITY_NORMAL | DUMP_FLAG_PROTO);
         }
 
@@ -2216,6 +2222,14 @@
         }
     }
 
+    @Nullable
+    ClientState getClientState(IInputMethodClient client) {
+        synchronized (ImfLock.class) {
+            return mClientController.getClient(client.asBinder());
+        }
+    }
+
+    // TODO(b/314150112): Move this to ClientController.
     @GuardedBy("ImfLock.class")
     void unbindCurrentClientLocked(@UnbindReason int unbindClientReason) {
         if (mCurClient != null) {
@@ -3741,6 +3755,20 @@
         return imeClientFocus == WindowManagerInternal.ImeClientFocusResult.HAS_IME_FOCUS;
     }
 
+    //TODO(b/293640003): merge with startInputOrWindowGainedFocus once Flags.useZeroJankProxy()
+    // is enabled.
+    @Override
+    public void startInputOrWindowGainedFocusAsync(
+            @StartInputReason int startInputReason, IInputMethodClient client, IBinder windowToken,
+            @StartInputFlags int startInputFlags, @SoftInputModeFlags int softInputMode,
+            int windowFlags, @Nullable EditorInfo editorInfo,
+            IRemoteInputConnection inputConnection,
+            IRemoteAccessibilityInputConnection remoteAccessibilityInputConnection,
+            int unverifiedTargetSdkVersion, @UserIdInt int userId,
+            @NonNull ImeOnBackInvokedDispatcher imeDispatcher, int startInputSeq) {
+        // implemented by ZeroJankProxy
+    }
+
     @NonNull
     @Override
     public InputBindResult startInputOrWindowGainedFocus(
diff --git a/services/core/java/com/android/server/inputmethod/ZeroJankProxy.java b/services/core/java/com/android/server/inputmethod/ZeroJankProxy.java
new file mode 100644
index 0000000..692fd7dc
--- /dev/null
+++ b/services/core/java/com/android/server/inputmethod/ZeroJankProxy.java
@@ -0,0 +1,406 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.inputmethod;
+
+import static com.android.server.inputmethod.InputMethodManagerService.TAG;
+
+import android.Manifest;
+import android.annotation.BinderThread;
+import android.annotation.EnforcePermission;
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.RequiresPermission;
+import android.annotation.UserIdInt;
+import android.os.Binder;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ResultReceiver;
+import android.os.ShellCallback;
+import android.util.ExceptionUtils;
+import android.util.Slog;
+import android.view.WindowManager;
+import android.view.inputmethod.CursorAnchorInfo;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.ImeTracker;
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodManager;
+import android.view.inputmethod.InputMethodSubtype;
+import android.window.ImeOnBackInvokedDispatcher;
+
+import com.android.internal.inputmethod.DirectBootAwareness;
+import com.android.internal.inputmethod.IConnectionlessHandwritingCallback;
+import com.android.internal.inputmethod.IImeTracker;
+import com.android.internal.inputmethod.IInputMethodClient;
+import com.android.internal.inputmethod.IRemoteAccessibilityInputConnection;
+import com.android.internal.inputmethod.IRemoteInputConnection;
+import com.android.internal.inputmethod.InputBindResult;
+import com.android.internal.inputmethod.SoftInputShowHideReason;
+import com.android.internal.inputmethod.StartInputFlags;
+import com.android.internal.inputmethod.StartInputReason;
+import com.android.internal.util.FunctionalUtils.ThrowingRunnable;
+import com.android.internal.view.IInputMethodManager;
+
+import java.io.FileDescriptor;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+
+/**
+ * A proxy that processes all {@link IInputMethodManager} calls asynchronously.
+ * @hide
+ */
+public class ZeroJankProxy extends IInputMethodManager.Stub {
+
+    private final IInputMethodManager mInner;
+    private final Executor mExecutor;
+
+    ZeroJankProxy(Executor executor, IInputMethodManager inner) {
+        mInner = inner;
+        mExecutor = executor;
+    }
+
+    private void offload(ThrowingRunnable r) {
+        offloadInner(r);
+    }
+
+    private void offload(Runnable r) {
+        offloadInner(r);
+    }
+
+    private void offloadInner(Runnable r) {
+        boolean useThrowingRunnable = r instanceof ThrowingRunnable;
+        final long identity = Binder.clearCallingIdentity();
+        try {
+            mExecutor.execute(() -> {
+                final long inner = Binder.clearCallingIdentity();
+                // Restoring calling identity, so we can still do permission checks on caller.
+                Binder.restoreCallingIdentity(identity);
+                try {
+                    try {
+                        if (useThrowingRunnable) {
+                            ((ThrowingRunnable) r).runOrThrow();
+                        } else {
+                            r.run();
+                        }
+                    } catch (Exception e) {
+                        Slog.e(TAG, "Error in async call", e);
+                        throw ExceptionUtils.propagate(e);
+                    }
+                } finally {
+                    Binder.restoreCallingIdentity(inner);
+                }
+            });
+        } finally {
+            Binder.restoreCallingIdentity(identity);
+        }
+    }
+
+    @Override
+    public void addClient(IInputMethodClient client, IRemoteInputConnection inputConnection,
+            int selfReportedDisplayId) throws RemoteException {
+        offload(() -> mInner.addClient(client, inputConnection, selfReportedDisplayId));
+    }
+
+    @Override
+    public InputMethodInfo getCurrentInputMethodInfoAsUser(int userId) throws RemoteException {
+        return mInner.getCurrentInputMethodInfoAsUser(userId);
+    }
+
+    @Override
+    public List<InputMethodInfo> getInputMethodList(
+            int userId, @DirectBootAwareness int directBootAwareness) throws RemoteException {
+        return mInner.getInputMethodList(userId, directBootAwareness);
+    }
+
+    @Override
+    public List<InputMethodInfo> getEnabledInputMethodList(int userId) throws RemoteException {
+        return mInner.getEnabledInputMethodList(userId);
+    }
+
+    @Override
+    public List<InputMethodSubtype> getEnabledInputMethodSubtypeList(String imiId,
+            boolean allowsImplicitlyEnabledSubtypes, int userId)
+            throws RemoteException {
+        return mInner.getEnabledInputMethodSubtypeList(imiId, allowsImplicitlyEnabledSubtypes,
+                userId);
+    }
+
+    @Override
+    public InputMethodSubtype getLastInputMethodSubtype(int userId) throws RemoteException {
+        return mInner.getLastInputMethodSubtype(userId);
+    }
+
+    @Override
+    public boolean showSoftInput(IInputMethodClient client, IBinder windowToken,
+            @Nullable ImeTracker.Token statsToken, @InputMethodManager.ShowFlags int flags,
+            int lastClickTooType, ResultReceiver resultReceiver,
+            @SoftInputShowHideReason int reason)
+            throws RemoteException {
+        offload(() -> mInner.showSoftInput(client, windowToken, statsToken, flags, lastClickTooType,
+                resultReceiver, reason));
+        return true;
+    }
+
+    @Override
+    public boolean hideSoftInput(IInputMethodClient client, IBinder windowToken,
+            @Nullable ImeTracker.Token statsToken, @InputMethodManager.HideFlags int flags,
+            ResultReceiver resultReceiver, @SoftInputShowHideReason int reason)
+            throws RemoteException {
+        offload(() -> mInner.hideSoftInput(client, windowToken, statsToken, flags, resultReceiver,
+                reason));
+        return true;
+    }
+
+    @Override
+    public void startInputOrWindowGainedFocusAsync(
+            @StartInputReason int startInputReason,
+            IInputMethodClient client, IBinder windowToken,
+            @StartInputFlags int startInputFlags,
+            @WindowManager.LayoutParams.SoftInputModeFlags int softInputMode,
+            int windowFlags, @Nullable EditorInfo editorInfo,
+            IRemoteInputConnection inputConnection,
+            IRemoteAccessibilityInputConnection remoteAccessibilityInputConnection,
+            int unverifiedTargetSdkVersion, @UserIdInt int userId,
+            @NonNull ImeOnBackInvokedDispatcher imeDispatcher, int startInputSeq)
+            throws RemoteException {
+        offload(() -> {
+            InputBindResult result = mInner.startInputOrWindowGainedFocus(startInputReason, client,
+                    windowToken, startInputFlags, softInputMode, windowFlags,
+                    editorInfo,
+                    inputConnection, remoteAccessibilityInputConnection,
+                    unverifiedTargetSdkVersion,
+                    userId, imeDispatcher);
+            sendOnStartInputResult(client, result, startInputSeq);
+        });
+    }
+
+    @RequiresPermission(android.Manifest.permission.INTERACT_ACROSS_USERS_FULL)
+    @Override
+    public InputBindResult startInputOrWindowGainedFocus(
+            @StartInputReason int startInputReason,
+            IInputMethodClient client, IBinder windowToken,
+            @StartInputFlags int startInputFlags,
+            @WindowManager.LayoutParams.SoftInputModeFlags int softInputMode,
+            int windowFlags, @Nullable EditorInfo editorInfo,
+            IRemoteInputConnection inputConnection,
+            IRemoteAccessibilityInputConnection remoteAccessibilityInputConnection,
+            int unverifiedTargetSdkVersion, @UserIdInt int userId,
+            @NonNull ImeOnBackInvokedDispatcher imeDispatcher)
+            throws RemoteException {
+        // Should never be called when flag is enabled i.e. when this proxy is used.
+        return null;
+    }
+
+    @Override
+    public void showInputMethodPickerFromClient(IInputMethodClient client,
+            int auxiliarySubtypeMode)
+            throws RemoteException {
+        offload(() -> mInner.showInputMethodPickerFromClient(client, auxiliarySubtypeMode));
+    }
+
+    @EnforcePermission(Manifest.permission.WRITE_SECURE_SETTINGS)
+    @Override
+    public void showInputMethodPickerFromSystem(int auxiliarySubtypeMode, int displayId)
+            throws RemoteException {
+        mInner.showInputMethodPickerFromSystem(auxiliarySubtypeMode, displayId);
+    }
+
+    @EnforcePermission(Manifest.permission.TEST_INPUT_METHOD)
+    @Override
+    public boolean isInputMethodPickerShownForTest() throws RemoteException {
+        super.isInputMethodPickerShownForTest_enforcePermission();
+        return mInner.isInputMethodPickerShownForTest();
+    }
+
+    @Override
+    public InputMethodSubtype getCurrentInputMethodSubtype(int userId) throws RemoteException {
+        return mInner.getCurrentInputMethodSubtype(userId);
+    }
+
+    @Override
+    public void setAdditionalInputMethodSubtypes(String imiId, InputMethodSubtype[] subtypes,
+            @UserIdInt int userId) throws RemoteException {
+        mInner.setAdditionalInputMethodSubtypes(imiId, subtypes, userId);
+    }
+
+    @Override
+    public void setExplicitlyEnabledInputMethodSubtypes(String imeId,
+            @NonNull int[] subtypeHashCodes, @UserIdInt int userId) throws RemoteException {
+        mInner.setExplicitlyEnabledInputMethodSubtypes(imeId, subtypeHashCodes, userId);
+    }
+
+    @Override
+    public int getInputMethodWindowVisibleHeight(IInputMethodClient client)
+            throws RemoteException {
+        return mInner.getInputMethodWindowVisibleHeight(client);
+    }
+
+    @Override
+    public void reportPerceptibleAsync(IBinder windowToken, boolean perceptible)
+            throws RemoteException {
+        // Already async TODO(b/293640003): ordering issues?
+        mInner.reportPerceptibleAsync(windowToken, perceptible);
+    }
+
+    @EnforcePermission(Manifest.permission.INTERNAL_SYSTEM_WINDOW)
+    @Override
+    public void removeImeSurface() throws RemoteException {
+        mInner.removeImeSurface();
+    }
+
+    @Override
+    public void removeImeSurfaceFromWindowAsync(IBinder windowToken) throws RemoteException {
+        mInner.removeImeSurfaceFromWindowAsync(windowToken);
+    }
+
+    @Override
+    public void startProtoDump(byte[] bytes, int i, String s) throws RemoteException {
+        mInner.startProtoDump(bytes, i, s);
+    }
+
+    @Override
+    public boolean isImeTraceEnabled() throws RemoteException {
+        return mInner.isImeTraceEnabled();
+    }
+
+    @EnforcePermission(Manifest.permission.CONTROL_UI_TRACING)
+    @Override
+    public void startImeTrace() throws RemoteException {
+        mInner.startImeTrace();
+    }
+
+    @EnforcePermission(Manifest.permission.CONTROL_UI_TRACING)
+    @Override
+    public void stopImeTrace() throws RemoteException {
+        mInner.stopImeTrace();
+    }
+
+    @Override
+    public void startStylusHandwriting(IInputMethodClient client)
+            throws RemoteException {
+        offload(() -> mInner.startStylusHandwriting(client));
+    }
+
+    @Override
+    public void startConnectionlessStylusHandwriting(IInputMethodClient client, int userId,
+            @Nullable CursorAnchorInfo cursorAnchorInfo, @Nullable String delegatePackageName,
+            @Nullable String delegatorPackageName,
+            @NonNull IConnectionlessHandwritingCallback callback) throws RemoteException {
+        offload(() -> mInner.startConnectionlessStylusHandwriting(
+                client, userId, cursorAnchorInfo, delegatePackageName, delegatorPackageName,
+                callback));
+    }
+
+    @Override
+    public boolean acceptStylusHandwritingDelegation(
+            @NonNull IInputMethodClient client,
+            @UserIdInt int userId,
+            @NonNull String delegatePackageName,
+            @NonNull String delegatorPackageName,
+            @InputMethodManager.HandwritingDelegateFlags int flags) {
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    return mInner.acceptStylusHandwritingDelegation(
+                            client, userId, delegatePackageName, delegatorPackageName, flags);
+                } catch (RemoteException e) {
+                    throw new RuntimeException(e);
+                }
+            }, this::offload).get();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        } catch (ExecutionException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void prepareStylusHandwritingDelegation(
+            @NonNull IInputMethodClient client,
+            @UserIdInt int userId,
+            @NonNull String delegatePackageName,
+            @NonNull String delegatorPackageName) {
+        offload(() -> mInner.prepareStylusHandwritingDelegation(
+                client, userId, delegatePackageName, delegatorPackageName));
+    }
+
+    @Override
+    public boolean isStylusHandwritingAvailableAsUser(int userId, boolean connectionless)
+            throws RemoteException {
+        return mInner.isStylusHandwritingAvailableAsUser(userId, connectionless);
+    }
+
+    @EnforcePermission("android.permission.TEST_INPUT_METHOD")
+    @Override
+    public void addVirtualStylusIdForTestSession(IInputMethodClient client)
+            throws RemoteException {
+        mInner.addVirtualStylusIdForTestSession(client);
+    }
+
+    @EnforcePermission("android.permission.TEST_INPUT_METHOD")
+    @Override
+    public void setStylusWindowIdleTimeoutForTest(IInputMethodClient client, long timeout)
+            throws RemoteException {
+        mInner.setStylusWindowIdleTimeoutForTest(client, timeout);
+    }
+
+    @Override
+    public IImeTracker getImeTrackerService() throws RemoteException {
+        return mInner.getImeTrackerService();
+    }
+
+    @BinderThread
+    @Override
+    public void onShellCommand(@Nullable FileDescriptor in, @Nullable FileDescriptor out,
+            @Nullable FileDescriptor err,
+            @NonNull String[] args, @Nullable ShellCallback callback,
+            @NonNull ResultReceiver resultReceiver) throws RemoteException {
+        ((InputMethodManagerService) mInner).onShellCommand(
+                in, out, err, args, callback, resultReceiver);
+    }
+
+    private void sendOnStartInputResult(
+            IInputMethodClient client, InputBindResult res, int startInputSeq) {
+        InputMethodManagerService service = (InputMethodManagerService) mInner;
+        final ClientState cs = service.getClientState(client);
+        if (cs != null && cs.mClient != null) {
+            cs.mClient.onStartInputResult(res, startInputSeq);
+        } else {
+            // client is unbound.
+            Slog.i(TAG, "Client that requested startInputOrWindowGainedFocus is no longer"
+                    + " bound. InputBindResult: " + res + " for startInputSeq: " + startInputSeq);
+        }
+    }
+}
+