feat: added Kotlin MapColorScheme sample

ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/MapColorSchemeActivity.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.
+ */
+
+package com.example.kotlindemos
+
+import android.os.Bundle
+import android.widget.Button
+
+import androidx.appcompat.app.AppCompatActivity
+
+import com.google.android.gms.maps.GoogleMap
+import com.google.android.gms.maps.OnMapReadyCallback
+import com.google.android.gms.maps.SupportMapFragment
+import com.google.android.gms.maps.model.MapColorScheme
+
+
+class MapColorSchemeActivity :
+    AppCompatActivity(), OnMapReadyCallback {
+
+    /** This is ok to be lateinit as it is initialised in onMapReady */
+    private lateinit var map: GoogleMap
+
+
+    private lateinit var buttonLight: Button
+    private lateinit var buttonDark: Button
+    private lateinit var buttonFollowSystem: Button
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.map_color_scheme_demo)
+        val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
+        mapFragment?.getMapAsync(this)
+        buttonLight = findViewById(R.id.map_color_light_mode)
+        buttonDark = findViewById(R.id.map_color_dark_mode)
+        buttonFollowSystem = findViewById(R.id.map_color_follow_system_mode)
+    }
+
+    override fun onMapReady(googleMap: GoogleMap) {
+        map = googleMap
+        map.mapColorScheme = MapColorScheme.DARK
+
+        buttonLight.setOnClickListener {
+            map.mapColorScheme = MapColorScheme.LIGHT
+        }
+
+        buttonDark.setOnClickListener {
+            map.mapColorScheme = MapColorScheme.DARK
+        }
+
+        buttonFollowSystem.setOnClickListener {
+            map.mapColorScheme = MapColorScheme.FOLLOW_SYSTEM
+        }
+    }
+}

ApiDemos/kotlin/app/src/gms/res/layout/map_color_scheme_demo.xml

@@ -0,0 +1,60 @@
+<!--
+ Copyright 2023 Google LLC
+
+ 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.
+-->
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:map="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <!--We need to add the map id to make advanced markers work. For more information,
+    check out https://developers.google.com/maps/documentation/get-map-id#create-a-map-id. -->
+    <fragment
+        android:id="@+id/map"
+        class="com.google.android.gms.maps.SupportMapFragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        map:backgroundColor="#fff0b2dd"
+        map:mapId="@string/map_id" />
+
+    <LinearLayout
+        android:id="@+id/cloud_styling_basic_demo_mode_buttons"
+        style="?android:attr/buttonBarStyle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="#D000"
+        android:orientation="horizontal">
+
+        <Button
+            android:id="@+id/map_color_light_mode"
+            style="?android:attr/buttonBarButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/map_color_light_mode" />
+
+        <Button
+            android:id="@+id/map_color_dark_mode"
+            style="?android:attr/buttonBarButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/map_color_dark_mode" />
+
+        <Button
+            android:id="@+id/map_color_follow_system_mode"
+            style="?android:attr/buttonBarButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/map_color_follow_system_mode" />
+    </LinearLayout>
+</RelativeLayout>