chore: Add StreetViewPanoramaViewDemoActivity in Kotlin (googlemaps-samples#209)

Also apply following changes to Java version:
* Refactor variables to remove Hungarian notation
* Add missing annotation

Author: barbeau

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

@@ -22,6 +22,7 @@
 import android.os.Bundle;
 import android.view.ViewGroup.LayoutParams;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 
 /**
@@ -32,7 +33,7 @@ public class StreetViewPanoramaViewDemoActivity extends AppCompatActivity {
     // George St, Sydney
     private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
 
-    private StreetViewPanoramaView mStreetViewPanoramaView;
+    private StreetViewPanoramaView streetViewPanoramaView;
 
     private static final String STREETVIEW_BUNDLE_KEY = "StreetViewBundleKey";
 
@@ -45,48 +46,48 @@ protected void onCreate(Bundle savedInstanceState) {
             options.position(SYDNEY);
         }
 
-        mStreetViewPanoramaView = new StreetViewPanoramaView(this, options);
-        addContentView(mStreetViewPanoramaView,
+        streetViewPanoramaView = new StreetViewPanoramaView(this, options);
+        addContentView(streetViewPanoramaView,
                 new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 
         // *** IMPORTANT ***
         // StreetViewPanoramaView requires that the Bundle you pass contain _ONLY_
         // StreetViewPanoramaView SDK objects or sub-Bundles.
-        Bundle mStreetViewBundle = null;
+        Bundle streetViewBundle = null;
         if (savedInstanceState != null) {
-            mStreetViewBundle = savedInstanceState.getBundle(STREETVIEW_BUNDLE_KEY);
+            streetViewBundle = savedInstanceState.getBundle(STREETVIEW_BUNDLE_KEY);
         }
-        mStreetViewPanoramaView.onCreate(mStreetViewBundle);
+        streetViewPanoramaView.onCreate(streetViewBundle);
     }
 
     @Override
     protected void onResume() {
-        mStreetViewPanoramaView.onResume();
+        streetViewPanoramaView.onResume();
         super.onResume();
     }
 
     @Override
     protected void onPause() {
-        mStreetViewPanoramaView.onPause();
+        streetViewPanoramaView.onPause();
         super.onPause();
     }
 
     @Override
     protected void onDestroy() {
-        mStreetViewPanoramaView.onDestroy();
+        streetViewPanoramaView.onDestroy();
         super.onDestroy();
     }
 
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
 
-        Bundle mStreetViewBundle = outState.getBundle(STREETVIEW_BUNDLE_KEY);
-        if (mStreetViewBundle == null) {
-            mStreetViewBundle = new Bundle();
-            outState.putBundle(STREETVIEW_BUNDLE_KEY, mStreetViewBundle);
+        Bundle streetViewBundle = outState.getBundle(STREETVIEW_BUNDLE_KEY);
+        if (streetViewBundle == null) {
+            streetViewBundle = new Bundle();
+            outState.putBundle(STREETVIEW_BUNDLE_KEY, streetViewBundle);
         }
 
-        mStreetViewPanoramaView.onSaveInstanceState(mStreetViewBundle);
+        streetViewPanoramaView.onSaveInstanceState(streetViewBundle);
     }
 }

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

@@ -61,6 +61,11 @@ class DemoDetailsList {
                         R.string.street_view_panorama_events_demo_label,
                         R.string.street_view_panorama_events_demo_details,
                         StreetViewPanoramaEventsDemoActivity::class.java),
+                DemoDetails(
+                        R.string.street_view_panorama_view_demo_label,
+                        R.string.street_view_panorama_view_demo_details,
+                        StreetViewPanoramaViewDemoActivity::class.java
+                ),
                 DemoDetails(R.string.tags_demo_label, R.string.tags_demo_details,
                         TagsDemoActivity::class.java),
                 DemoDetails(R.string.ui_settings_demo_label, R.string.ui_settings_demo_details,

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

@@ -0,0 +1,81 @@
+// 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.ViewGroup
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.gms.maps.StreetViewPanoramaOptions
+import com.google.android.gms.maps.StreetViewPanoramaView
+import com.google.android.gms.maps.model.LatLng
+
+/**
+ * This shows how to create a simple activity with streetview
+ */
+class StreetViewPanoramaViewDemoActivity : AppCompatActivity() {
+    private lateinit var streetViewPanoramaView: StreetViewPanoramaView
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val options = StreetViewPanoramaOptions()
+        savedInstanceState ?: options.position(SYDNEY)
+        streetViewPanoramaView = StreetViewPanoramaView(this, options)
+        addContentView(
+            streetViewPanoramaView,
+            ViewGroup.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                ViewGroup.LayoutParams.MATCH_PARENT
+            )
+        )
+
+        // *** IMPORTANT ***
+        // StreetViewPanoramaView requires that the Bundle you pass contain _ONLY_
+        // StreetViewPanoramaView SDK objects or sub-Bundles.
+        streetViewPanoramaView.onCreate(savedInstanceState?.getBundle(STREETVIEW_BUNDLE_KEY))
+    }
+
+    override fun onResume() {
+        streetViewPanoramaView.onResume()
+        super.onResume()
+    }
+
+    override fun onPause() {
+        streetViewPanoramaView.onPause()
+        super.onPause()
+    }
+
+    override fun onDestroy() {
+        streetViewPanoramaView.onDestroy()
+        super.onDestroy()
+    }
+
+    public override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        var streetViewBundle = outState.getBundle(STREETVIEW_BUNDLE_KEY)
+        if (streetViewBundle == null) {
+            streetViewBundle = Bundle()
+            outState.putBundle(
+                STREETVIEW_BUNDLE_KEY,
+                streetViewBundle
+            )
+        }
+        streetViewPanoramaView.onSaveInstanceState(streetViewBundle)
+    }
+
+    companion object {
+        // George St, Sydney
+        private val SYDNEY = LatLng(-33.87365, 151.20689)
+        private const val STREETVIEW_BUNDLE_KEY = "StreetViewBundleKey"
+    }
+}

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

@@ -61,6 +61,7 @@
         <activity android:name=".StreetViewPanoramaBasicDemoActivity" />
         <activity android:name=".StreetViewPanoramaOptionsDemoActivity" />
         <activity android:name=".StreetViewPanoramaEventsDemoActivity" />
+        <activity android:name=".StreetViewPanoramaViewDemoActivity" />
     </application>
 
 </manifest>

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

@@ -168,6 +168,10 @@
     <string name="tap_screen">tap screen</string>
     <string name="long_press_screen">long press screen</string>
 
+    <!-- StreetView PanoramaView Demo -->
+    <string name="street_view_panorama_view_demo_label">Street View Panorama View</string>
+    <string name="street_view_panorama_view_demo_details">Standard Street View Panorama using a View.</string>
+
     <!-- Tags Demo -->
     <string name="tags_demo_label">Tags</string>
     <string name="tags_demo_details">Demonstrates how to get and set tags on API objects.</string>