[Switch] Add thumb icon tint to the new switch styles

PiperOrigin-RevId: 451422588

Author: drchen

lib/java/com/google/android/material/materialswitch/res/color/mtrl_switch_thumb_icon_tint.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2022 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.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <!-- State Disabled, Unchecked -->
+  <item
+    android:alpha="@dimen/m3_comp_switch_disabled_unselected_icon_opacity"
+    android:color="@macro/m3_comp_switch_disabled_unselected_icon_color"
+    android:state_enabled="false" android:state_checked="false"/>
+
+  <!-- State Disabled, Checked -->
+  <item
+    android:alpha="@dimen/m3_comp_switch_disabled_selected_icon_opacity"
+    android:color="@macro/m3_comp_switch_disabled_selected_icon_color"
+    android:state_enabled="false" android:state_checked="true"/>
+
+  <!-- State Checked -->
+  <item android:color="@macro/m3_comp_switch_selected_icon_color" android:state_checked="true"/>
+
+  <!-- State Unchecked -->
+  <item android:color="@macro/m3_comp_switch_unselected_icon_color"/>
+</selector>

lib/java/com/google/android/material/materialswitch/res/values/styles.xml

@@ -19,6 +19,7 @@
     <item name="track">@drawable/mtrl_switch_track</item>
     <item name="trackDecoration">@drawable/mtrl_switch_track_decoration</item>
     <item name="thumbTint">@color/mtrl_switch_thumb_tint</item>
+    <item name="thumbIconTint">@color/mtrl_switch_thumb_icon_tint</item>
     <item name="trackTint">@color/mtrl_switch_track_tint</item>
     <item name="trackDecorationTint">@color/mtrl_switch_track_decoration_tint</item>
     <item name="switchPadding">@dimen/mtrl_switch_text_padding</item>