diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/recents/ISystemUiProxy.aidl b/packages/SystemUI/shared/src/com/android/systemui/shared/recents/ISystemUiProxy.aidl
index 078947c..953816e 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/recents/ISystemUiProxy.aidl
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/recents/ISystemUiProxy.aidl
@@ -17,6 +17,7 @@
 package com.android.systemui.shared.recents;
 
 import android.graphics.Rect;
+import android.os.Bundle;
 import android.view.MotionEvent;
 
 /**
@@ -82,4 +83,13 @@
      */
     boolean supportsRoundedCornersOnWindows() = 11;
 
+    /**
+     * Proxies the assistant gesture's progress started from navigation bar.
+     */
+    void onAssistantProgress(float progress) = 12;
+
+    /**
+     * Start the assistant.
+     */
+    void startAssistant(in Bundle bundle) = 13;
 }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java b/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
index 83c4cfc..b794888 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
@@ -29,6 +29,7 @@
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_SYSUI_PROXY;
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_WINDOW_CORNER_RADIUS;
 
+import android.annotation.FloatRange;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
@@ -269,6 +270,30 @@
             }
         }
 
+        public void onAssistantProgress(@FloatRange(from = 0.0, to = 1.0) float progress) {
+            if (!verifyCaller("onAssistantProgress")) {
+                return;
+            }
+            long token = Binder.clearCallingIdentity();
+            try {
+                mHandler.post(() -> notifyAssistantProgress(progress));
+            } finally {
+                Binder.restoreCallingIdentity(token);
+            }
+        }
+
+        public void startAssistant(Bundle bundle) {
+            if (!verifyCaller("startAssistant")) {
+                return;
+            }
+            long token = Binder.clearCallingIdentity();
+            try {
+                mHandler.post(() -> notifyStartAssistant(bundle));
+            } finally {
+                Binder.restoreCallingIdentity(token);
+            }
+        }
+
         private boolean verifyCaller(String reason) {
             final int callerId = Binder.getCallingUserHandle().getIdentifier();
             if (callerId != mCurrentBoundedUserId) {
@@ -590,6 +615,18 @@
         }
     }
 
+    private void notifyAssistantProgress(@FloatRange(from = 0.0, to = 1.0) float progress) {
+        for (int i = mConnectionCallbacks.size() - 1; i >= 0; --i) {
+            mConnectionCallbacks.get(i).onAssistantProgress(progress);
+        }
+    }
+
+    private void notifyStartAssistant(Bundle bundle) {
+        for (int i = mConnectionCallbacks.size() - 1; i >= 0; --i) {
+            mConnectionCallbacks.get(i).startAssistant(bundle);
+        }
+    }
+
     private void updateEnabledState() {
         mIsEnabled = mContext.getPackageManager().resolveServiceAsUser(mQuickStepIntent,
                 MATCH_DIRECT_BOOT_UNAWARE,
@@ -637,5 +674,7 @@
         default void onOverviewShown(boolean fromHome) {}
         default void onQuickScrubStarted() {}
         default void onBackButtonAlphaChanged(float alpha, boolean animate) {}
+        default void onAssistantProgress(@FloatRange(from = 0.0, to = 1.0) float progress) {}
+        default void startAssistant(Bundle bundle) {}
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
index 1eb4990..9be47f7 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
@@ -185,6 +185,11 @@
         }
 
         @Override
+        public void startAssistant(Bundle bundle) {
+            mAssistManager.startAssist(bundle);
+        }
+
+        @Override
         public void onBackButtonAlphaChanged(float alpha, boolean animate) {
             final ButtonDispatcher backButton = mNavigationBarView.getBackButton();
             if (QuickStepController.shouldhideBackButton(getContext())) {