[Reduce Bright Colors] Add labels to intensity slider

Test: Manual
Bug: b/128465252
Change-Id: I278aed9a7da552d787c7b5426504f6f429d4d6ab

res/layout/preference_labeled_continuous_slider.xml

@@ -0,0 +1,68 @@
+<?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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:minHeight="?android:attr/listPreferredItemHeight"
+              android:gravity="center_vertical"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:orientation="vertical"
+              android:paddingStart="56dp"
+              android:paddingEnd="8dp"
+              android:paddingTop="16dp"
+              android:paddingBottom="16dp">
+
+    <TextView
+        android:id="@android:id/title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:paddingBottom="16dp"
+        android:layout_marginStart="16dp"
+        android:maxLines="1"
+        android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+        android:textColor="?android:attr/textColorPrimary" />
+
+    <SeekBar
+        android:id="@*android:id/seekbar"
+        android:layout_gravity="center_vertical"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingTop="8dp"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@android:id/text1"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_weight="1"
+            android:maxLines="1"
+            android:textAlignment="viewStart"/>
+
+        <TextView
+            android:id="@android:id/text2"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="16dp"
+            android:layout_weight="1"
+            android:maxLines="1"
+            android:textAlignment="viewEnd"/>
+    </LinearLayout>
+</LinearLayout>

res/xml/reduce_bright_colors_settings.xml

@@ -17,13 +17,16 @@
 
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res-auto"
     android:persistent="false"
     android:title="@string/reduce_bright_colors_preference_title">
 
-    <com.android.settings.widget.SeekBarPreference
+    <com.android.settings.widget.LabeledContinuousSeekBarPreference
         android:key="rbc_intensity"
         android:persistent="false"
-        android:title="@string/reduce_bright_colors_intensity_preference_title"/>
+        android:title="@string/reduce_bright_colors_intensity_preference_title"
+        settings:textStart="@string/reduce_bright_colors_intensity_preference_start_label"
+        settings:textEnd="@string/reduce_bright_colors_intensity_preference_end_label"/>
 
     <SwitchPreference
         android:key="rbc_persist"

src/com/android/settings/widget/LabeledContinuousSeekBarPreference.java

@@ -0,0 +1,44 @@
+/*
+ * 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.
+ */
+
+package com.android.settings.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import com.android.settings.R;
+
+/** A continuous labeled slider preference */
+public class LabeledContinuousSeekBarPreference extends LabeledSeekBarPreference {
+    public LabeledContinuousSeekBarPreference(Context context) {
+        this(context, null);
+    }
+
+    public LabeledContinuousSeekBarPreference(Context context, AttributeSet attrs) {
+       this(context, attrs, 0);
+    }
+
+    public LabeledContinuousSeekBarPreference(Context context, AttributeSet attrs,
+            int defStyleAttr) {
+        this(context, attrs, defStyleAttr, 0);
+    }
+
+    public LabeledContinuousSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        setLayoutResource(R.layout.preference_labeled_continuous_slider);
+    }
+}