diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index 7107bf7..e93467b 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -415,6 +415,7 @@
     method public void clickNotification(@Nullable String, int, int, boolean);
     method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void collapsePanels();
     method public void expandNotificationsPanel();
+    method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public int getLastSystemKey();
     method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void handleSystemKey(int);
     method public void sendNotificationFeedback(@Nullable String, @Nullable android.os.Bundle);
     method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void setExpansionDisabledForSimNetworkLock(boolean);
@@ -2628,6 +2629,7 @@
     field public static final String SELECTED_SPELL_CHECKER_SUBTYPE = "selected_spell_checker_subtype";
     field public static final String SHOW_FIRST_CRASH_DIALOG_DEV_OPTION = "show_first_crash_dialog_dev_option";
     field public static final String SHOW_IME_WITH_HARD_KEYBOARD = "show_ime_with_hard_keyboard";
+    field public static final String STYLUS_BUTTONS_ENABLED = "stylus_buttons_enabled";
     field @RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS) public static final String SYNC_PARENT_SOUNDS = "sync_parent_sounds";
     field public static final String VOICE_INTERACTION_SERVICE = "voice_interaction_service";
   }
diff --git a/core/java/android/app/StatusBarManager.java b/core/java/android/app/StatusBarManager.java
index f74be22..29f774c 100644
--- a/core/java/android/app/StatusBarManager.java
+++ b/core/java/android/app/StatusBarManager.java
@@ -752,6 +752,29 @@
     }
 
     /**
+     * Gets the last handled system key. A system key is a KeyEvent that the
+     * {@link com.android.server.policy.PhoneWindowManager} sends directly to the
+     * status bar, rather than forwarding to apps. If a key has never been sent to the
+     * status bar, will return -1.
+     *
+     * @return the keycode of the last KeyEvent that has been sent to the system.
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.STATUS_BAR)
+    @TestApi
+    public int getLastSystemKey() {
+        try {
+            final IStatusBarService svc = getService();
+            if (svc != null) {
+                return svc.getLastSystemKey();
+            }
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+        return -1;
+    }
+
+    /**
      * Expand the settings panel.
      *
      * @hide
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 893fce2..7ae280f 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -7414,6 +7414,8 @@
          *
          * @hide
          */
+        @TestApi
+        @Readable
         @SuppressLint("NoSettingsProvider")
         public static final String STYLUS_BUTTONS_ENABLED = "stylus_buttons_enabled";
 
diff --git a/core/java/com/android/internal/statusbar/IStatusBarService.aidl b/core/java/com/android/internal/statusbar/IStatusBarService.aidl
index 8f04cda..c1dbc87 100644
--- a/core/java/com/android/internal/statusbar/IStatusBarService.aidl
+++ b/core/java/com/android/internal/statusbar/IStatusBarService.aidl
@@ -111,6 +111,7 @@
     void clickTile(in ComponentName tile);
     @UnsupportedAppUsage
     void handleSystemKey(in int key);
+    int getLastSystemKey();
 
     /**
      * Methods to show toast messages for screen pinning
diff --git a/services/core/java/com/android/server/statusbar/StatusBarManagerService.java b/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
index 88d64df..35e88c1 100644
--- a/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
+++ b/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
@@ -33,6 +33,7 @@
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.RequiresPermission;
+import android.annotation.TestApi;
 import android.app.ActivityManager;
 import android.app.ActivityManagerInternal;
 import android.app.ActivityThread;
@@ -178,6 +179,7 @@
     private final SessionMonitor mSessionMonitor;
     private int mCurrentUserId;
     private boolean mTracingEnabled;
+    private int mLastSystemKey = -1;
 
     private final TileRequestTracker mTileRequestTracker;
 
@@ -905,6 +907,8 @@
             return;
         }
 
+        mLastSystemKey = key;
+
         if (mBar != null) {
             try {
                 mBar.handleSystemKey(key);
@@ -914,6 +918,14 @@
     }
 
     @Override
+    @TestApi
+    public int getLastSystemKey() {
+        enforceStatusBar();
+
+        return mLastSystemKey;
+    }
+
+    @Override
     public void showPinningEnterExitToast(boolean entering) throws RemoteException {
         if (mBar != null) {
             try {