chore: Add IndoorDemoActivity in Kotlin (#232)

Also apply following changes to Java version:
* Refactor variables to remove Hungarian notation
* Remove redundant cast for TextView
* Fix spelling in string

ApiDemos/java/app/src/gms/java/com/example/mapdemo/IndoorDemoActivity.java

@@ -36,7 +36,7 @@ import java.util.List;
  */
 public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyCallback {
 
-    private GoogleMap mMap;
+    private GoogleMap map;
 
     private boolean showLevelPicker = true;
 
@@ -51,9 +51,9 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
     }
 
     @Override
-    public void onMapReady(GoogleMap map) {
-        mMap = map;
-        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(37.614631, -122.385153), 18));
+    public void onMapReady(GoogleMap googleMap) {
+        map = googleMap;
+        map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(37.614631, -122.385153), 18));
     }
 
     /**
@@ -61,14 +61,14 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
      */
     public void onToggleLevelPicker(View view) {
         showLevelPicker = !showLevelPicker;
-        mMap.getUiSettings().setIndoorLevelPickerEnabled(showLevelPicker);
+        map.getUiSettings().setIndoorLevelPickerEnabled(showLevelPicker);
     }
 
     /**
      * Called when the focused building info is clicked.
      */
     public void onFocusedBuildingInfo(View view) {
-        IndoorBuilding building = mMap.getFocusedBuilding();
+        IndoorBuilding building = map.getFocusedBuilding();
         if (building != null) {
             StringBuilder s = new StringBuilder();
             for (IndoorLevel level : building.getLevels()) {
@@ -87,7 +87,7 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
      * Called when the focused level info is clicked.
      */
     public void onVisibleLevelInfo(View view) {
-        IndoorBuilding building = mMap.getFocusedBuilding();
+        IndoorBuilding building = map.getFocusedBuilding();
         if (building != null) {
             IndoorLevel level =
                     building.getLevels().get(building.getActiveLevelIndex());
@@ -105,7 +105,7 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
      * Called when the activate higher level is clicked.
      */
     public void onHigherLevel(View view) {
-        IndoorBuilding building = mMap.getFocusedBuilding();
+        IndoorBuilding building = map.getFocusedBuilding();
         if (building != null) {
             List<IndoorLevel> levels = building.getLevels();
             if (!levels.isEmpty()) {
@@ -117,7 +117,7 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
                     newLevel = levels.size() - 1;
                 }
                 IndoorLevel level = levels.get(newLevel);
-                setText("Activiating level " + level.getName());
+                setText("Activating level " + level.getName());
                 level.activate();
             } else {
                 setText("No levels in building");
@@ -128,7 +128,7 @@ public class IndoorDemoActivity extends AppCompatActivity implements OnMapReadyC
     }
 
     private void setText(String message) {
-        TextView text = (TextView) findViewById(R.id.top_text);
+        TextView text = findViewById(R.id.top_text);
         text.setText(message);
     }
 }

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

@@ -39,6 +39,8 @@ class DemoDetailsList {
                         R.string.ground_overlay_demo_label,
                         R.string.ground_overlay_demo_details,
                         GroundOverlayDemoActivity::class.java),
+                DemoDetails(R.string.indoor_demo_label, R.string.indoor_demo_details,
+                        IndoorDemoActivity::class.java),
                 DemoDetails(R.string.layers_demo_label, R.string.layers_demo_description,
                         LayersDemoActivity::class.java),
                 DemoDetails(R.string.lite_demo_label, R.string.lite_demo_details,

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

@@ -0,0 +1,129 @@
+// Copyright 2020 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.
+package com.example.kotlindemos
+
+import android.os.Bundle
+import android.view.View
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.gms.maps.CameraUpdateFactory
+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.LatLng
+
+/**
+ * A demo activity showing how to use indoor.
+ */
+class IndoorDemoActivity : AppCompatActivity(), OnMapReadyCallback {
+
+    private lateinit var map: GoogleMap
+    private var showLevelPicker = true
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.indoor_demo)
+        val mapFragment =
+            supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
+        mapFragment?.getMapAsync(this)
+    }
+
+    override fun onMapReady(googleMap: GoogleMap?) {
+        map = googleMap ?: return
+        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(LatLng(37.614631, -122.385153), 18f))
+    }
+
+    /**
+     * Called when the toggle level picker button is clicked.
+     */
+    fun onToggleLevelPicker(view: View?) {
+        if (!::map.isInitialized) return
+
+        showLevelPicker = !showLevelPicker
+        map.uiSettings.isIndoorLevelPickerEnabled = showLevelPicker
+    }
+
+    /**
+     * Called when the focused building info is clicked.
+     */
+    fun onFocusedBuildingInfo(view: View?) {
+        if (!::map.isInitialized) return
+
+        val building = map.focusedBuilding
+        if (building != null) {
+            val s = StringBuilder()
+            for (level in building.levels) {
+                s.append(level.name).append(" ")
+            }
+            if (building.isUnderground) {
+                s.append("is underground")
+            }
+            setText(s.toString())
+        } else {
+            setText("No visible building")
+        }
+    }
+
+    /**
+     * Called when the focused level info is clicked.
+     */
+    fun onVisibleLevelInfo(view: View?) {
+        if (!::map.isInitialized) return
+
+        val building = map.focusedBuilding
+        if (building != null) {
+            val level = building.levels[building.activeLevelIndex]
+            if (level != null) {
+                setText(level.name)
+            } else {
+                setText("No visible level")
+            }
+        } else {
+            setText("No visible building")
+        }
+    }
+
+    /**
+     * Called when the activate higher level is clicked.
+     */
+    fun onHigherLevel(view: View?) {
+        if (!::map.isInitialized) return
+
+        val building = map.focusedBuilding
+        if (building != null) {
+            val levels = building.levels
+            if (!levels.isEmpty()) {
+                val currentLevel = building.activeLevelIndex
+                // The levels are in 'display order' from top to bottom,
+                // i.e. higher levels in the building are lower numbered in the array.
+                var newLevel = currentLevel - 1
+                if (newLevel == -1) {
+                    newLevel = levels.size - 1
+                }
+                val level = levels[newLevel]
+                setText("Activating level " + level.name)
+                level.activate()
+            } else {
+                setText("No levels in building")
+            }
+        } else {
+            setText("No visible building")
+        }
+    }
+
+    private fun setText(message: String) {
+        val text = findViewById<TextView>(R.id.top_text)
+        text.text = message
+    }
+}

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

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+     Copyright (C) 2012 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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+
+        <fragment
+            android:id="@+id/map"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            class="com.google.android.gms.maps.SupportMapFragment" />
+        <!-- A small label at the top of the screen. -->
+        <TextView
+            android:id="@+id/top_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentTop="true" />
+    </RelativeLayout>
+    <!-- A set of test buttons. -->
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="100dp">
+
+        <TableLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:stretchColumns="1">
+
+            <TableRow>
+
+                <Button
+                    android:id="@+id/focused_bulding_info_button"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:onClick="onFocusedBuildingInfo"
+                    android:text="@string/focused_building_info" />
+
+                <Button
+                    android:id="@+id/toggle_level_picker_button"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:onClick="onToggleLevelPicker"
+                    android:text="@string/toggle_level_picker" />
+            </TableRow>
+
+            <TableRow>
+
+                <Button
+                    android:id="@+id/focused_level_info_button"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:onClick="onVisibleLevelInfo"
+                    android:text="@string/focused_level_info" />
+
+                <Button
+                    android:id="@+id/higher_level_button"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:onClick="onHigherLevel"
+                    android:text="@string/activate_higher_level" />
+            </TableRow>
+        </TableLayout>
+    </ScrollView>
+</LinearLayout>

ApiDemos/kotlin/app/src/main/AndroidManifest.xml

@@ -65,6 +65,7 @@
         <activity android:name=".LiteDemoActivity" />
         <activity android:name=".EventsDemoActivity" />
         <activity android:name=".GroundOverlayDemoActivity" />
+        <activity android:name=".IndoorDemoActivity" />
     </application>
 
 </manifest>

ApiDemos/kotlin/app/src/main/res/values/strings.xml

@@ -61,6 +61,14 @@
     <string name="transparency">Transparency</string>
     <string name="switch_image">Switch Image</string>
 
+    <!--     Indoor    -->
+    <string name="indoor_demo_label">Indoor</string>
+    <string name="indoor_demo_details">Demonstrates how to use the Indoor API.</string>
+    <string name="activate_higher_level">Activate Higher Level</string>
+    <string name="focused_building_info">Focused Building</string>
+    <string name="focused_level_info">Focused Level</string>
+    <string name="toggle_level_picker">Toggle Level Picker</string>
+
     <!-- Layers Demo -->
     <string name="buildings">Buildings</string>
     <string name="hybrid">Hybrid</string>