[Slider] Updates tick marks color to fix the contrast in medium / high contrast modes.

Resolves #4204

PiperOrigin-RevId: 652895433

Author: pekingme

lib/java/com/google/android/material/slider/BaseSlider.java

@@ -1750,7 +1750,6 @@ public void setTrackActiveTintList(@NonNull ColorStateList trackColor) {
     }
     trackColorActive = trackColor;
     activeTrackPaint.setColor(getColorForState(trackColorActive));
-    stopIndicatorPaint.setColor(getColorForState(trackColorActive));
     invalidate();
   }
 
@@ -2838,7 +2837,7 @@ protected void drawableStateChanged() {
     activeTrackPaint.setColor(getColorForState(trackColorActive));
     inactiveTicksPaint.setColor(getColorForState(tickColorInactive));
     activeTicksPaint.setColor(getColorForState(tickColorActive));
-    stopIndicatorPaint.setColor(getColorForState(trackColorActive));
+    stopIndicatorPaint.setColor(getColorForState(tickColorInactive));
     for (TooltipDrawable label : labels) {
       if (label.isStateful()) {
         label.setState(getDrawableState());

lib/java/com/google/android/material/slider/res/color/m3_slider_active_tick_marks_color.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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">
+  <item android:color="?attr/colorOnPrimary" android:state_enabled="true"/>
+  <!-- When disabled, the tick marks over active track should be the same color as the inactive track. -->
+  <item android:alpha="@dimen/m3_comp_slider_disabled_inactive_track_opacity"
+        android:color="@macro/m3_comp_slider_disabled_inactive_track_color"/>
+</selector>

lib/java/com/google/android/material/slider/res/color/m3_slider_inactive_tick_marks_color.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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">
+  <item android:color="?attr/colorOnSecondaryContainer" android:state_enabled="true" />
+  <!-- When disabled, the tick marks over inactive track should be the same color as the active track. -->
+  <item android:alpha="@dimen/m3_comp_slider_disabled_active_track_opacity"
+        android:color="@macro/m3_comp_slider_disabled_active_track_color" />
+</selector>

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

@@ -61,8 +61,8 @@
     <item name="haloColor">#00FFFFFF</item>
     <item name="labelStyle">@style/Widget.Material3.Slider.Label</item>
     <item name="thumbColor">@color/m3_slider_thumb_color</item>
-    <item name="tickColorActive">@color/m3_slider_inactive_track_color</item>
-    <item name="tickColorInactive">@color/m3_slider_active_track_color</item>
+    <item name="tickColorActive">@color/m3_slider_active_tick_marks_color</item>
+    <item name="tickColorInactive">@color/m3_slider_inactive_tick_marks_color</item>
     <item name="tickRadiusActive">@null</item>
     <item name="tickRadiusInactive">@null</item>
     <item name="trackColorActive">@color/m3_slider_active_track_color</item>