Add colours for disabled state for switch in SwitchPreference for watch devices.

Bug: 30578046
Change-Id: I692f6375a73c9d334d576d3eca7f9721af120e30
diff --git a/core/res/res/color/watch_switch_thumb_color_material.xml b/core/res/res/color/watch_switch_thumb_color_material.xml
index d4796a0..f78d9b6 100644
--- a/core/res/res/color/watch_switch_thumb_color_material.xml
+++ b/core/res/res/color/watch_switch_thumb_color_material.xml
@@ -10,9 +10,9 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:color="?android:colorButtonNormal" android:state_enabled="false" />
-    <item android:color="?android:colorControlActivated" android:state_checked="true" />
-    <item android:color="?android:colorButtonNormal" />
-</selector>
\ No newline at end of file
+    <item android:color="?attr/colorButtonNormal" android:alpha="?attr/disabledAlpha"
+            android:state_enabled="false" />
+    <item android:color="?attr/colorControlActivated" android:state_checked="true" />
+    <item android:color="?attr/colorButtonNormal" />
+</selector>
diff --git a/core/res/res/color/watch_switch_track_color_material.xml b/core/res/res/color/watch_switch_track_color_material.xml
new file mode 100644
index 0000000..402a536
--- /dev/null
+++ b/core/res/res/color/watch_switch_track_color_material.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2016 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.
+-->
+<!-- Used for the background of switch track for watch switch preference. -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_enabled="false"
+          android:alpha="0.4" android:color="?attr/colorPrimary" />
+    <item android:color="?attr/colorPrimary" />
+</selector>
diff --git a/core/res/res/layout-watch/preference_widget_switch.xml b/core/res/res/layout-watch/preference_widget_switch.xml
index 37d0c6b..ffc00b4 100644
--- a/core/res/res/layout-watch/preference_widget_switch.xml
+++ b/core/res/res/layout-watch/preference_widget_switch.xml
@@ -24,7 +24,7 @@
     android:thumb="@drawable/watch_switch_thumb_material_anim"
     android:thumbTint="@color/watch_switch_thumb_color_material"
     android:track="@drawable/watch_switch_track_material"
-    android:trackTint="?android:colorPrimary"
+    android:trackTint="@color/watch_switch_track_color_material"
     android:focusable="false"
     android:clickable="false"
     android:background="@null" />