diff --git a/core/java/android/window/TaskFragmentOperation.java b/core/java/android/window/TaskFragmentOperation.java
index e153bb7..43fa0be 100644
--- a/core/java/android/window/TaskFragmentOperation.java
+++ b/core/java/android/window/TaskFragmentOperation.java
@@ -80,6 +80,14 @@
      */
     public static final int OP_TYPE_REORDER_TO_FRONT = 10;
 
+    /**
+     * Sets the activity navigation to be isolated, where the activity navigation on the
+     * TaskFragment is separated from the rest activities in the Task. Activities cannot be
+     * started on an isolated TaskFragment unless the activities are launched from the same
+     * TaskFragment or explicitly requested to.
+     */
+    public static final int OP_TYPE_SET_ISOLATED_NAVIGATION = 11;
+
     @IntDef(prefix = { "OP_TYPE_" }, value = {
             OP_TYPE_UNKNOWN,
             OP_TYPE_CREATE_TASK_FRAGMENT,
@@ -92,7 +100,8 @@
             OP_TYPE_SET_COMPANION_TASK_FRAGMENT,
             OP_TYPE_SET_ANIMATION_PARAMS,
             OP_TYPE_SET_RELATIVE_BOUNDS,
-            OP_TYPE_REORDER_TO_FRONT
+            OP_TYPE_REORDER_TO_FRONT,
+            OP_TYPE_SET_ISOLATED_NAVIGATION
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface OperationType {}
@@ -118,11 +127,14 @@
     @Nullable
     private final TaskFragmentAnimationParams mAnimationParams;
 
+    private final boolean mIsolatedNav;
+
     private TaskFragmentOperation(@OperationType int opType,
             @Nullable TaskFragmentCreationParams taskFragmentCreationParams,
             @Nullable IBinder activityToken, @Nullable Intent activityIntent,
             @Nullable Bundle bundle, @Nullable IBinder secondaryFragmentToken,
-            @Nullable TaskFragmentAnimationParams animationParams) {
+            @Nullable TaskFragmentAnimationParams animationParams,
+            boolean isolatedNav) {
         mOpType = opType;
         mTaskFragmentCreationParams = taskFragmentCreationParams;
         mActivityToken = activityToken;
@@ -130,6 +142,7 @@
         mBundle = bundle;
         mSecondaryFragmentToken = secondaryFragmentToken;
         mAnimationParams = animationParams;
+        mIsolatedNav = isolatedNav;
     }
 
     private TaskFragmentOperation(Parcel in) {
@@ -140,6 +153,7 @@
         mBundle = in.readBundle(getClass().getClassLoader());
         mSecondaryFragmentToken = in.readStrongBinder();
         mAnimationParams = in.readTypedObject(TaskFragmentAnimationParams.CREATOR);
+        mIsolatedNav = in.readBoolean();
     }
 
     @Override
@@ -151,6 +165,7 @@
         dest.writeBundle(mBundle);
         dest.writeStrongBinder(mSecondaryFragmentToken);
         dest.writeTypedObject(mAnimationParams, flags);
+        dest.writeBoolean(mIsolatedNav);
     }
 
     @NonNull
@@ -223,6 +238,14 @@
         return mAnimationParams;
     }
 
+    /**
+     * Returns whether the activity navigation on this TaskFragment is isolated. This is only
+     * useful when the op type is {@link OP_TYPE_SET_ISOLATED_NAVIGATION}.
+     */
+    public boolean isIsolatedNav() {
+        return mIsolatedNav;
+    }
+
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder();
@@ -245,6 +268,7 @@
         if (mAnimationParams != null) {
             sb.append(", animationParams=").append(mAnimationParams);
         }
+        sb.append(", isolatedNav=").append(mIsolatedNav);
 
         sb.append('}');
         return sb.toString();
@@ -253,7 +277,7 @@
     @Override
     public int hashCode() {
         return Objects.hash(mOpType, mTaskFragmentCreationParams, mActivityToken, mActivityIntent,
-                mBundle, mSecondaryFragmentToken, mAnimationParams);
+                mBundle, mSecondaryFragmentToken, mAnimationParams, mIsolatedNav);
     }
 
     @Override
@@ -268,7 +292,8 @@
                 && Objects.equals(mActivityIntent, other.mActivityIntent)
                 && Objects.equals(mBundle, other.mBundle)
                 && Objects.equals(mSecondaryFragmentToken, other.mSecondaryFragmentToken)
-                && Objects.equals(mAnimationParams, other.mAnimationParams);
+                && Objects.equals(mAnimationParams, other.mAnimationParams)
+                && mIsolatedNav == other.mIsolatedNav;
     }
 
     @Override
@@ -300,6 +325,8 @@
         @Nullable
         private TaskFragmentAnimationParams mAnimationParams;
 
+        private boolean mIsolatedNav;
+
         /**
          * @param opType the {@link OperationType} of this {@link TaskFragmentOperation}.
          */
@@ -363,12 +390,22 @@
         }
 
         /**
+         * Sets the activity navigation of this TaskFragment to be isolated.
+         */
+        @NonNull
+        public Builder setIsolatedNav(boolean isolatedNav) {
+            mIsolatedNav = isolatedNav;
+            return this;
+        }
+
+        /**
          * Constructs the {@link TaskFragmentOperation}.
          */
         @NonNull
         public TaskFragmentOperation build() {
             return new TaskFragmentOperation(mOpType, mTaskFragmentCreationParams, mActivityToken,
-                    mActivityIntent, mBundle, mSecondaryFragmentToken, mAnimationParams);
+                    mActivityIntent, mBundle, mSecondaryFragmentToken, mAnimationParams,
+                    mIsolatedNav);
         }
     }
 }
diff --git a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/JetpackTaskFragmentOrganizer.java b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/JetpackTaskFragmentOrganizer.java
index d94e8e4..4d73c20 100644
--- a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/JetpackTaskFragmentOrganizer.java
+++ b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/JetpackTaskFragmentOrganizer.java
@@ -17,7 +17,9 @@
 package androidx.window.extensions.embedding;
 
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
+import static android.window.TaskFragmentOperation.OP_TYPE_REORDER_TO_FRONT;
 import static android.window.TaskFragmentOperation.OP_TYPE_SET_ANIMATION_PARAMS;
+import static android.window.TaskFragmentOperation.OP_TYPE_SET_ISOLATED_NAVIGATION;
 
 import static androidx.window.extensions.embedding.SplitContainer.getFinishPrimaryWithSecondaryBehavior;
 import static androidx.window.extensions.embedding.SplitContainer.getFinishSecondaryWithPrimaryBehavior;
@@ -340,6 +342,20 @@
         wct.deleteTaskFragment(fragmentToken);
     }
 
+    void reorderTaskFragmentToFront(@NonNull WindowContainerTransaction wct,
+            @NonNull IBinder fragmentToken) {
+        final TaskFragmentOperation operation = new TaskFragmentOperation.Builder(
+                OP_TYPE_REORDER_TO_FRONT).build();
+        wct.addTaskFragmentOperation(fragmentToken, operation);
+    }
+
+    void setTaskFragmentIsolatedNavigation(@NonNull WindowContainerTransaction wct,
+            @NonNull IBinder fragmentToken, boolean isolatedNav) {
+        final TaskFragmentOperation operation = new TaskFragmentOperation.Builder(
+                OP_TYPE_SET_ISOLATED_NAVIGATION).setIsolatedNav(isolatedNav).build();
+        wct.addTaskFragmentOperation(fragmentToken, operation);
+    }
+
     void updateTaskFragmentInfo(@NonNull TaskFragmentInfo taskFragmentInfo) {
         mFragmentInfos.put(taskFragmentInfo.getFragmentToken(), taskFragmentInfo);
     }
diff --git a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java
index a2f75e0..f95f3ff 100644
--- a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java
+++ b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java
@@ -250,6 +250,10 @@
             // Updates the Split
             final TransactionRecord transactionRecord = mTransactionManager.startNewTransaction();
             final WindowContainerTransaction wct = transactionRecord.getTransaction();
+
+            mPresenter.setTaskFragmentIsolatedNavigation(wct,
+                    splitPinContainer.getSecondaryContainer().getTaskFragmentToken(),
+                    true /* isolatedNav */);
             mPresenter.updateSplitContainer(splitPinContainer, wct);
             transactionRecord.apply(false /* shouldApplyIndependently */);
             updateCallbackIfNecessary();
diff --git a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitPresenter.java b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitPresenter.java
index 4dafbd1..5de6acf 100644
--- a/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitPresenter.java
+++ b/libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitPresenter.java
@@ -17,7 +17,6 @@
 package androidx.window.extensions.embedding;
 
 import static android.content.pm.PackageManager.MATCH_ALL;
-import static android.window.TaskFragmentOperation.OP_TYPE_REORDER_TO_FRONT;
 
 import android.app.Activity;
 import android.app.ActivityThread;
@@ -40,7 +39,6 @@
 import android.view.WindowMetrics;
 import android.window.TaskFragmentAnimationParams;
 import android.window.TaskFragmentCreationParams;
-import android.window.TaskFragmentOperation;
 import android.window.WindowContainerTransaction;
 
 import androidx.annotation.IntDef;
@@ -427,10 +425,8 @@
         final SplitPinContainer pinnedContainer =
                 container.getTaskContainer().getSplitPinContainer();
         if (pinnedContainer != null) {
-            final TaskFragmentOperation operation = new TaskFragmentOperation.Builder(
-                    OP_TYPE_REORDER_TO_FRONT).build();
-            wct.addTaskFragmentOperation(
-                    pinnedContainer.getSecondaryContainer().getTaskFragmentToken(), operation);
+            reorderTaskFragmentToFront(wct,
+                    pinnedContainer.getSecondaryContainer().getTaskFragmentToken());
         }
     }
 
diff --git a/services/core/java/com/android/server/wm/ActivityStarter.java b/services/core/java/com/android/server/wm/ActivityStarter.java
index 884100c..d187d23 100644
--- a/services/core/java/com/android/server/wm/ActivityStarter.java
+++ b/services/core/java/com/android/server/wm/ActivityStarter.java
@@ -3100,7 +3100,18 @@
         } else {
             TaskFragment candidateTf = mAddingToTaskFragment != null ? mAddingToTaskFragment : null;
             if (candidateTf == null) {
-                final ActivityRecord top = task.topRunningActivity(false /* focusableOnly */);
+                // Puts the activity on the top-most non-isolated navigation TF, unless the
+                // activity is launched from the same TF.
+                final TaskFragment sourceTaskFragment =
+                        mSourceRecord != null ? mSourceRecord.getTaskFragment() : null;
+                final ActivityRecord top = task.getActivity(r -> {
+                    if (!r.canBeTopRunning()) {
+                        return false;
+                    }
+                    final TaskFragment taskFragment = r.getTaskFragment();
+                    return !taskFragment.isIsolatedNav() || (sourceTaskFragment != null
+                            && sourceTaskFragment == taskFragment);
+                });
                 if (top != null) {
                     candidateTf = top.getTaskFragment();
                 }
diff --git a/services/core/java/com/android/server/wm/TaskFragment.java b/services/core/java/com/android/server/wm/TaskFragment.java
index 92c0987..57ce368 100644
--- a/services/core/java/com/android/server/wm/TaskFragment.java
+++ b/services/core/java/com/android/server/wm/TaskFragment.java
@@ -329,6 +329,15 @@
      */
     private boolean mDelayLastActivityRemoval;
 
+    /**
+     * Whether the activity navigation should be isolated. That is, Activities cannot be launched
+     * on an isolated TaskFragment, unless the activity is launched from an Activity in the same
+     * isolated TaskFragment, or explicitly requested to be launched to.
+     * <p>
+     * Note that only an embedded TaskFragment can be isolated.
+     */
+    private boolean mIsolatedNav;
+
     final Point mLastSurfaceSize = new Point();
 
     private final Rect mTmpBounds = new Rect();
@@ -481,6 +490,19 @@
         return mAnimationParams;
     }
 
+    /** @see #mIsolatedNav */
+    void setIsolatedNav(boolean isolatedNav) {
+        if (!isEmbedded()) {
+            return;
+        }
+        mIsolatedNav = isolatedNav;
+    }
+
+    /** @see #mIsolatedNav */
+    boolean isIsolatedNav() {
+        return isEmbedded() && mIsolatedNav;
+    }
+
     TaskFragment getAdjacentTaskFragment() {
         return mAdjacentTaskFragment;
     }
@@ -3034,7 +3056,8 @@
     @Override
     void dump(PrintWriter pw, String prefix, boolean dumpAll) {
         super.dump(pw, prefix, dumpAll);
-        pw.println(prefix + "bounds=" + getBounds().toShortString());
+        pw.println(prefix + "bounds=" + getBounds().toShortString()
+                + (mIsolatedNav ? ", isolatedNav" : ""));
         final String doublePrefix = prefix + "  ";
         for (int i = mChildren.size() - 1; i >= 0; i--) {
             final WindowContainer<?> child = mChildren.get(i);
diff --git a/services/core/java/com/android/server/wm/WindowOrganizerController.java b/services/core/java/com/android/server/wm/WindowOrganizerController.java
index 5d239eb..be0f6db 100644
--- a/services/core/java/com/android/server/wm/WindowOrganizerController.java
+++ b/services/core/java/com/android/server/wm/WindowOrganizerController.java
@@ -30,6 +30,7 @@
 import static android.window.TaskFragmentOperation.OP_TYPE_SET_ADJACENT_TASK_FRAGMENTS;
 import static android.window.TaskFragmentOperation.OP_TYPE_SET_ANIMATION_PARAMS;
 import static android.window.TaskFragmentOperation.OP_TYPE_SET_COMPANION_TASK_FRAGMENT;
+import static android.window.TaskFragmentOperation.OP_TYPE_SET_ISOLATED_NAVIGATION;
 import static android.window.TaskFragmentOperation.OP_TYPE_SET_RELATIVE_BOUNDS;
 import static android.window.TaskFragmentOperation.OP_TYPE_START_ACTIVITY_IN_TASK_FRAGMENT;
 import static android.window.TaskFragmentOperation.OP_TYPE_UNKNOWN;
@@ -1356,6 +1357,11 @@
                 }
                 break;
             }
+            case OP_TYPE_SET_ISOLATED_NAVIGATION: {
+                final boolean isolatedNav = operation.isIsolatedNav();
+                taskFragment.setIsolatedNav(isolatedNav);
+                break;
+            }
         }
         return effects;
     }
diff --git a/services/tests/wmtests/src/com/android/server/wm/TaskFragmentTest.java b/services/tests/wmtests/src/com/android/server/wm/TaskFragmentTest.java
index 9d597b1..6a9bb6c 100644
--- a/services/tests/wmtests/src/com/android/server/wm/TaskFragmentTest.java
+++ b/services/tests/wmtests/src/com/android/server/wm/TaskFragmentTest.java
@@ -653,4 +653,23 @@
         assertEquals(mDisplayContent.getImeContainer().getParent().getSurfaceControl(),
                 mDisplayContent.computeImeParent());
     }
+
+    @Test
+    public void testIsolatedNavigation() {
+        final Task task = createTask(mDisplayContent);
+        final TaskFragment tf0 = new TaskFragmentBuilder(mAtm)
+                .setParentTask(task)
+                .createActivityCount(1)
+                .setOrganizer(mOrganizer)
+                .setFragmentToken(new Binder())
+                .build();
+
+        // Cannot be isolated if not embedded.
+        task.setIsolatedNav(true);
+        assertFalse(task.isIsolatedNav());
+
+        // Ensure the TaskFragment is isolated once set.
+        tf0.setIsolatedNav(true);
+        assertTrue(tf0.isIsolatedNav());
+    }
 }