Add wear_keep to datalayer-helper-guide and sample (#2385)

* Add wear_keep to datalayer-helper-guide and sample

* Move keep files to res/raw and update docs

* Mention issue with link in datalayer-helpers-guide

datalayer/sample/wear/src/main/res/raw/wear_keep.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright 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
+  ~
+  ~      https://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:tools="http://schemas.android.com/tools" tools:keep="@array/android_wear_capabilities"/>

docs/datalayer-helpers-guide.md

@@ -28,9 +28,10 @@ phone.
 
 2. Add the capabilities
 
-   Add a `wear.xml` file in the `res/values` folder with the following content:
+   Add a `wear.xml` file in the `res/raw` folder with the following content. It needs to be
+   `res/raw` folder due to https://issuetracker.google.com/issues/348688201
 
-    ```
+    ```xml
     <resources xmlns:tools="http://schemas.android.com/tools"
         tools:keep="@array/android_wear_capabilities">
         <string-array name="android_wear_capabilities">
@@ -55,6 +56,11 @@ phone.
     </string-array>
     </resources>
     ```
+   and a `res/raw/wear_keep.xml`
+
+   ```xml
+    <resources xmlns:tools="http://schemas.android.com/tools" tools:keep="@array/android_wear_capabilities"/>
+   ```
 
    on your wear and phone projects respectively.