Add overlays for nav bar interaction mode.

- Add config for nav bar interaction mode
- Add overlay packages for overriding the nav bar interaction mode
- Migrate existing swipe up setting into the resource overlay
  P2 P->Q:
    def/off -> 3 button overlay enabled (from default)
    set on  -> 2 button overlay enabled (from setting)
  P3 (default on):
    def (setting not exposed) -> 2 button overlay enabled (from default)

Bug: 127366543
Test: adb shell cmd overlay dump

Change-Id: I75590f81d9dd6a017776e0a34c295575bfe1bf2a

17 files changed, 393 insertions, 2 deletions

diff --git a/core/java/android/view/WindowManagerPolicyConstants.java b/core/java/android/view/WindowManagerPolicyConstants.java
index 35ed7bfa2ce6..46a59f09eca7 100644
--- a/core/java/android/view/WindowManagerPolicyConstants.java
+++ b/core/java/android/view/WindowManagerPolicyConstants.java
@@ -54,6 +54,16 @@ public interface WindowManagerPolicyConstants {
     int NAV_BAR_RIGHT = 1 << 1;
     int NAV_BAR_BOTTOM = 1 << 2;
 
+    // Navigation bar interaction modes
+    int NAV_BAR_MODE_3BUTTON = 0;
+    int NAV_BAR_MODE_2BUTTON = 1;
+    int NAV_BAR_MODE_GESTURAL = 2;
+
+    // Associated overlays for each nav bar mode
+    String NAV_BAR_MODE_3BUTTON_OVERLAY = "com.android.internal.systemui.navbar.threebutton";
+    String NAV_BAR_MODE_2BUTTON_OVERLAY = "com.android.internal.systemui.navbar.twobutton";
+    String NAV_BAR_MODE_GESTURAL_OVERLAY = "com.android.internal.systemui.navbar.gestural";
+
     /**
      * Broadcast sent when a user activity is detected.
      */
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 14edf6fe1aa3..14202f2d48d4 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -3222,6 +3222,12 @@
          -->
     <integer name="config_navBarOpacityMode">0</integer>
 
+    <!-- Controls the navigation bar interaction mode:
+         0: 3 button mode (back, home, overview buttons)
+         1: 2 button mode (back, home buttons + swipe up for overview)
+         2: gestures only for back, home and overview -->
+    <integer name="config_navBarInteractionMode">0</integer>
+
     <!-- Default insets [LEFT/RIGHTxTOP/BOTTOM] from the screen edge for picture-in-picture windows.
          These values are in DPs and will be converted to pixel sizes internally. -->
     <string translatable="false" name="config_defaultPictureInPictureScreenEdgeInsets">16x16</string>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 4ab9edb8bbaa..d7f4a6c3be25 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -2831,6 +2831,7 @@
   <java-symbol type="string" name="config_packagedKeyboardName" />
   <java-symbol type="bool" name="config_forceWindowDrawsStatusBarBackground" />
   <java-symbol type="integer" name="config_navBarOpacityMode" />
+  <java-symbol type="integer" name="config_navBarInteractionMode" />
   <java-symbol type="color" name="system_bar_background_semi_transparent" />
 
   <!-- EditText suggestion popup. -->
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
index 9e46ad6061eb..7337cdb81ebf 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
@@ -19,6 +19,12 @@ package com.android.providers.settings;
 import static android.os.Process.ROOT_UID;
 import static android.os.Process.SHELL_UID;
 import static android.os.Process.SYSTEM_UID;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_2BUTTON;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_2BUTTON_OVERLAY;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_3BUTTON;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_3BUTTON_OVERLAY;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL_OVERLAY;
 
 import android.Manifest;
 import android.annotation.NonNull;
@@ -33,6 +39,8 @@ import android.content.ContentValues;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.om.IOverlayManager;
+import android.content.om.OverlayInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageInfo;
@@ -3235,7 +3243,7 @@ public class SettingsProvider extends ContentProvider {
         }
 
         private final class UpgradeController {
-            private static final int SETTINGS_VERSION = 176;
+            private static final int SETTINGS_VERSION = 177;
 
             private final int mUserId;
 
@@ -4311,6 +4319,57 @@ public class SettingsProvider extends ContentProvider {
                     currentVersion = 176;
                 }
 
+                if (currentVersion == 176) {
+                    // Version 176: Migrate the existing swipe up setting into the resource overlay
+                    //              for the navigation bar interaction mode.
+
+                    final IOverlayManager overlayManager = IOverlayManager.Stub.asInterface(
+                            ServiceManager.getService(Context.OVERLAY_SERVICE));
+                    int navBarMode = -1;
+
+                    // Migrate the swipe up setting only if it is set
+                    final SettingsState secureSettings = getSecureSettingsLocked(userId);
+                    final Setting swipeUpSetting = secureSettings.getSettingLocked(
+                            Secure.SWIPE_UP_TO_SWITCH_APPS_ENABLED);
+                    if (swipeUpSetting != null && !swipeUpSetting.isNull()) {
+                        navBarMode = swipeUpSetting.getValue().equals("1")
+                                ? NAV_BAR_MODE_2BUTTON
+                                : NAV_BAR_MODE_3BUTTON;
+                    }
+
+                    // Temporary: Only for migration for dogfooders, to be removed
+                    try {
+                        final OverlayInfo info = overlayManager.getOverlayInfo(
+                                "com.android.internal.experiment.navbar.type.inset",
+                                UserHandle.USER_CURRENT);
+                        if (info != null && info.isEnabled()) {
+                            navBarMode = NAV_BAR_MODE_GESTURAL;
+                        }
+                    } catch (RemoteException e) {
+                        // Ingore, fall through
+                    }
+
+                    if (navBarMode != -1) {
+                        try {
+                            overlayManager.setEnabled(NAV_BAR_MODE_3BUTTON_OVERLAY,
+                                    navBarMode == NAV_BAR_MODE_3BUTTON,
+                                    UserHandle.USER_CURRENT);
+                            overlayManager.setEnabled(NAV_BAR_MODE_2BUTTON_OVERLAY,
+                                    navBarMode == NAV_BAR_MODE_2BUTTON,
+                                    UserHandle.USER_CURRENT);
+                            overlayManager.setEnabled(NAV_BAR_MODE_GESTURAL_OVERLAY,
+                                    navBarMode == NAV_BAR_MODE_GESTURAL,
+                                    UserHandle.USER_CURRENT);
+                        } catch (RemoteException e) {
+                            throw new IllegalStateException(
+                                    "Failed to set nav bar interaction mode overlay");
+                        }
+                    }
+
+                    currentVersion = 177;
+                }
+
+
                 // vXXX: Add new settings above this point.
 
                 if (currentVersion != newVersion) {
diff --git a/packages/overlays/Android.mk b/packages/overlays/Android.mk
index a15e89c8bcdb..b5223445d127 100644
--- a/packages/overlays/Android.mk
+++ b/packages/overlays/Android.mk
@@ -39,7 +39,10 @@ LOCAL_REQUIRED_MODULES := \
 	IconShapeRoundedRectOverlay \
 	IconShapeSquareOverlay \
 	IconShapeSquircleOverlay \
-	IconShapeTeardropOverlay
+	IconShapeTeardropOverlay \
+	NavigationBarMode3ButtonOverlay \
+	NavigationBarMode2ButtonOverlay \
+	NavigationBarModeGesturalOverlay
 
 include $(BUILD_PHONY_PACKAGE)
 include $(CLEAR_VARS)
diff --git a/packages/overlays/NavigationBarMode2ButtonOverlay/Android.mk b/packages/overlays/NavigationBarMode2ButtonOverlay/Android.mk
new file mode 100644
index 000000000000..410d6d87c61d
--- /dev/null
+++ b/packages/overlays/NavigationBarMode2ButtonOverlay/Android.mk
@@ -0,0 +1,30 @@
+#
+#  Copyright 2018, 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.
+#
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_RRO_THEME := NavigationBarMode2Button
+LOCAL_CERTIFICATE := platform
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
+
+LOCAL_PACKAGE_NAME := NavigationBarMode2ButtonOverlay
+LOCAL_SDK_VERSION := current
+
+include $(BUILD_RRO_PACKAGE)
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode2ButtonOverlay/AndroidManifest.xml b/packages/overlays/NavigationBarMode2ButtonOverlay/AndroidManifest.xml
new file mode 100644
index 000000000000..970380f070e9
--- /dev/null
+++ b/packages/overlays/NavigationBarMode2ButtonOverlay/AndroidManifest.xml
@@ -0,0 +1,27 @@
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+        package="com.android.internal.systemui.navbar.twobutton"
+        android:versionCode="1"
+        android:versionName="1.0">
+    <overlay android:targetPackage="android"
+        android:category="com.android.internal.navigation_bar_mode"
+        android:priority="1"/>
+
+    <application android:label="@string/navigation_bar_mode_title" android:hasCode="false"/>
+</manifest>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/config.xml b/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/config.xml
new file mode 100644
index 000000000000..b353322aed9c
--- /dev/null
+++ b/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/config.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2019, 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.
+ */
+-->
+<resources>
+    <!-- Controls the navigation bar interaction mode:
+         0: 3 button mode (back, home, overview buttons)
+         1: 2 button mode (back, home buttons + swipe up for overview)
+         2: gestures only for back, home and overview -->
+    <integer name="config_navBarInteractionMode">1</integer>
+</resources>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/strings.xml b/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/strings.xml
new file mode 100644
index 000000000000..1696ecfea4e4
--- /dev/null
+++ b/packages/overlays/NavigationBarMode2ButtonOverlay/res/values/strings.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- Name of overlay [CHAR LIMIT=64] -->
+    <string name="navigation_bar_mode_title" translatable="false">2 Button Navigation Bar</string>
+</resources>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode3ButtonOverlay/Android.mk b/packages/overlays/NavigationBarMode3ButtonOverlay/Android.mk
new file mode 100644
index 000000000000..2bc9a6aea9eb
--- /dev/null
+++ b/packages/overlays/NavigationBarMode3ButtonOverlay/Android.mk
@@ -0,0 +1,30 @@
+#
+#  Copyright 2018, 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.
+#
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_RRO_THEME := NavigationBarMode3Button
+LOCAL_CERTIFICATE := platform
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
+
+LOCAL_PACKAGE_NAME := NavigationBarMode3ButtonOverlay
+LOCAL_SDK_VERSION := current
+
+include $(BUILD_RRO_PACKAGE)
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode3ButtonOverlay/AndroidManifest.xml b/packages/overlays/NavigationBarMode3ButtonOverlay/AndroidManifest.xml
new file mode 100644
index 000000000000..628fc1dd3aa7
--- /dev/null
+++ b/packages/overlays/NavigationBarMode3ButtonOverlay/AndroidManifest.xml
@@ -0,0 +1,27 @@
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+        package="com.android.internal.systemui.navbar.threebutton"
+        android:versionCode="1"
+        android:versionName="1.0">
+    <overlay android:targetPackage="android"
+        android:category="com.android.internal.navigation_bar_mode"
+        android:priority="1"/>
+
+    <application android:label="@string/navigation_bar_mode_title" android:hasCode="false"/>
+</manifest>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/config.xml b/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/config.xml
new file mode 100644
index 000000000000..7bd0a140bb1c
--- /dev/null
+++ b/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/config.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2019, 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.
+ */
+-->
+<resources>
+    <!-- Controls the navigation bar interaction mode:
+         0: 3 button mode (back, home, overview buttons)
+         1: 2 button mode (back, home buttons + swipe up for overview)
+         2: gestures only for back, home and overview -->
+    <integer name="config_navBarInteractionMode">0</integer>
+</resources>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/strings.xml b/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/strings.xml
new file mode 100644
index 000000000000..201b9e94cfbc
--- /dev/null
+++ b/packages/overlays/NavigationBarMode3ButtonOverlay/res/values/strings.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- Name of overlay [CHAR LIMIT=64] -->
+    <string name="navigation_bar_mode_title" translatable="false">3 Button Navigation Bar</string>
+</resources>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarModeGesturalOverlay/Android.mk b/packages/overlays/NavigationBarModeGesturalOverlay/Android.mk
new file mode 100644
index 000000000000..5f7e0eb62a46
--- /dev/null
+++ b/packages/overlays/NavigationBarModeGesturalOverlay/Android.mk
@@ -0,0 +1,30 @@
+#
+#  Copyright 2018, 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.
+#
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_RRO_THEME := NavigationBarModeGestural
+LOCAL_CERTIFICATE := platform
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
+
+LOCAL_PACKAGE_NAME := NavigationBarModeGesturalOverlay
+LOCAL_SDK_VERSION := current
+
+include $(BUILD_RRO_PACKAGE)
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarModeGesturalOverlay/AndroidManifest.xml b/packages/overlays/NavigationBarModeGesturalOverlay/AndroidManifest.xml
new file mode 100644
index 000000000000..aff82d836ae5
--- /dev/null
+++ b/packages/overlays/NavigationBarModeGesturalOverlay/AndroidManifest.xml
@@ -0,0 +1,27 @@
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+        package="com.android.internal.systemui.navbar.gestural"
+        android:versionCode="1"
+        android:versionName="1.0">
+    <overlay android:targetPackage="android"
+        android:category="com.android.internal.navigation_bar_mode"
+        android:priority="1"/>
+
+    <application android:label="@string/navigation_bar_mode_title" android:hasCode="false"/>
+</manifest>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarModeGesturalOverlay/res/values/config.xml b/packages/overlays/NavigationBarModeGesturalOverlay/res/values/config.xml
new file mode 100644
index 000000000000..48c37695d4a1
--- /dev/null
+++ b/packages/overlays/NavigationBarModeGesturalOverlay/res/values/config.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2019, 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.
+ */
+-->
+<resources>
+    <!-- Controls the navigation bar interaction mode:
+         0: 3 button mode (back, home, overview buttons)
+         1: 2 button mode (back, home buttons + swipe up for overview)
+         2: gestures only for back, home and overview -->
+    <integer name="config_navBarInteractionMode">2</integer>
+</resources>
\ No newline at end of file
diff --git a/packages/overlays/NavigationBarModeGesturalOverlay/res/values/strings.xml b/packages/overlays/NavigationBarModeGesturalOverlay/res/values/strings.xml
new file mode 100644
index 000000000000..8d38916a0541
--- /dev/null
+++ b/packages/overlays/NavigationBarModeGesturalOverlay/res/values/strings.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (c) 2018, 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.
+ */
+-->
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- Name of overlay [CHAR LIMIT=64] -->
+    <string name="navigation_bar_mode_title" translatable="false">Gestural Navigation Bar</string>
+</resources>
\ No newline at end of file