[google_maps_flutter] Semi-convert remaining Android host API calls to Pigeon (flutter#6980)

Does a "shallow" Pigeon conversion of the remaining host API calls in the Android implementation. All of the actual method calls are now Pigeon, but for the most part the data structures are not yet converted, and the Pigeon representations of the map objects are instead placeholders that currently just wrap the existing JSON serialization. This is done for a few reasons:
- Keeps the incremental PR relatively small and easy to understand.
- Quickly gets us to a state where any new APIs added will automatically use Pigeon, reducing further accumulation of technical debt.
- Avoids duplication of handling code until flutter#150631 is resolved. As noted in a TODO added in this PR, almost all of the data structures that are passed in these methods are also passed through the PlatformView factory constructor, and Pigeon doesn't yet support using the Pigeon codec in non-Pigeon-generated code, so we would need to have both the structured *and* JSON handler for all of these objects if we converted them now.

Future PRs will be able to incrementally convert each map object to a structured form. Converting the Flutter APIs (Java->Dart) will also be done in a follow-up, to limit the scope of this PR.

Adds Dart unit tests for each method call, as they were previously not unit tested.

Part of flutter#117907

Author: stuartmorgan-g

packages/google_maps_flutter/google_maps_flutter_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.11.0
+
+* Converts additional platform calls to Pigeon.
+
 ## 2.10.0
 
 * Converts some platform calls to Pigeon.

packages/google_maps_flutter/google_maps_flutter_android/android/src/main/java/io/flutter/plugins/googlemaps/CirclesController.java

@@ -4,6 +4,7 @@
 
 package io.flutter.plugins.googlemaps;
 
+import androidx.annotation.NonNull;
 import com.google.android.gms.maps.GoogleMap;
 import com.google.android.gms.maps.model.Circle;
 import com.google.android.gms.maps.model.CircleOptions;
@@ -31,31 +32,28 @@ void setGoogleMap(GoogleMap googleMap) {
     this.googleMap = googleMap;
   }
 
-  void addCircles(List<Object> circlesToAdd) {
+  void addJsonCircles(List<Object> circlesToAdd) {
     if (circlesToAdd != null) {
       for (Object circleToAdd : circlesToAdd) {
-        addCircle(circleToAdd);
+        addJsonCircle(circleToAdd);
       }
     }
   }
 
-  void changeCircles(List<Object> circlesToChange) {
-    if (circlesToChange != null) {
-      for (Object circleToChange : circlesToChange) {
-        changeCircle(circleToChange);
-      }
+  void addCircles(@NonNull List<Messages.PlatformCircle> circlesToAdd) {
+    for (Messages.PlatformCircle circleToAdd : circlesToAdd) {
+      addJsonCircle(circleToAdd.getJson());
     }
   }
 
-  void removeCircles(List<Object> circleIdsToRemove) {
-    if (circleIdsToRemove == null) {
-      return;
+  void changeCircles(@NonNull List<Messages.PlatformCircle> circlesToChange) {
+    for (Object circleToChange : circlesToChange) {
+      changeCircle(circleToChange);
     }
-    for (Object rawCircleId : circleIdsToRemove) {
-      if (rawCircleId == null) {
-        continue;
-      }
-      String circleId = (String) rawCircleId;
+  }
+
+  void removeCircles(@NonNull List<String> circleIdsToRemove) {
+    for (String circleId : circleIdsToRemove) {
       final CircleController circleController = circleIdToController.remove(circleId);
       if (circleController != null) {
         circleController.remove();
@@ -77,7 +75,7 @@ boolean onCircleTap(String googleCircleId) {
     return false;
   }
 
-  private void addCircle(Object circle) {
+  private void addJsonCircle(Object circle) {
     if (circle == null) {
       return;
     }

packages/google_maps_flutter/google_maps_flutter_android/android/src/main/java/io/flutter/plugins/googlemaps/ClusterManagersController.java

@@ -79,18 +79,25 @@ private void initListenersForClusterManager(
   }
 
   /** Adds new ClusterManagers to the controller. */
-  void addClusterManagers(@NonNull List<Object> clusterManagersToAdd) {
+  void addJsonClusterManagers(@NonNull List<Object> clusterManagersToAdd) {
     for (Object clusterToAdd : clusterManagersToAdd) {
-      addClusterManager(clusterToAdd);
+      String clusterManagerId = getClusterManagerId(clusterToAdd);
+      if (clusterManagerId == null) {
+        throw new IllegalArgumentException("clusterManagerId was null");
+      }
+      addClusterManager(clusterManagerId);
     }
   }
 
-  /** Adds new ClusterManager to the controller. */
-  void addClusterManager(Object clusterManagerData) {
-    String clusterManagerId = getClusterManagerId(clusterManagerData);
-    if (clusterManagerId == null) {
-      throw new IllegalArgumentException("clusterManagerId was null");
+  /** Adds new ClusterManagers to the controller. */
+  void addClusterManagers(@NonNull List<Messages.PlatformClusterManager> clusterManagersToAdd) {
+    for (Messages.PlatformClusterManager clusterToAdd : clusterManagersToAdd) {
+      addClusterManager(clusterToAdd.getIdentifier());
     }
+  }
+
+  /** Adds new ClusterManager to the controller. */
+  void addClusterManager(String clusterManagerId) {
     ClusterManager<MarkerBuilder> clusterManager =
         new ClusterManager<MarkerBuilder>(context, googleMap, markerManager);
     ClusterRenderer<MarkerBuilder> clusterRenderer =
@@ -101,12 +108,8 @@ void addClusterManager(Object clusterManagerData) {
   }
 
   /** Removes ClusterManagers by given cluster manager IDs from the controller. */
-  public void removeClusterManagers(@NonNull List<Object> clusterManagerIdsToRemove) {
-    for (Object rawClusterManagerId : clusterManagerIdsToRemove) {
-      if (rawClusterManagerId == null) {
-        continue;
-      }
-      String clusterManagerId = (String) rawClusterManagerId;
+  public void removeClusterManagers(@NonNull List<String> clusterManagerIdsToRemove) {
+    for (String clusterManagerId : clusterManagerIdsToRemove) {
       removeClusterManager(clusterManagerId);
     }
   }

packages/google_maps_flutter/google_maps_flutter_android/android/src/main/java/io/flutter/plugins/googlemaps/Convert.java

@@ -9,9 +9,11 @@
 import android.graphics.BitmapFactory;
 import android.graphics.Point;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import com.google.android.gms.maps.CameraUpdate;
 import com.google.android.gms.maps.CameraUpdateFactory;
+import com.google.android.gms.maps.MapsInitializer;
 import com.google.android.gms.maps.model.BitmapDescriptor;
 import com.google.android.gms.maps.model.BitmapDescriptorFactory;
 import com.google.android.gms.maps.model.ButtCap;
@@ -357,6 +359,20 @@ private static int toInt(Object o) {
     return ((Number) o).intValue();
   }
 
+  static @Nullable MapsInitializer.Renderer toMapRendererType(
+      @Nullable Messages.PlatformRendererType type) {
+    if (type == null) {
+      return null;
+    }
+    switch (type) {
+      case LATEST:
+        return MapsInitializer.Renderer.LATEST;
+      case LEGACY:
+        return MapsInitializer.Renderer.LEGACY;
+    }
+    return null;
+  }
+
   static Object cameraPositionToJson(CameraPosition position) {
     if (position == null) {
       return null;