[google_map_flutter] Add missing template type parameter to `invokeMethod` calls. Bump minimum Flutter version to 1.5.0. Replace invokeMethod with invokeMapMethod wherever necessary.

packages/google_maps_flutter/CHANGELOG.md

diff --git a/packages/google_maps_flutter/CHANGELOG.md b/packages/google_maps_flutter/CHANGELOG.md
index d7e623d..08bb514 100644
--- a/packages/google_maps_flutter/CHANGELOG.md
+++ b/packages/google_maps_flutter/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.5.15+1
+
+* Add missing template type parameter to `invokeMethod` calls.
+* Bump minimum Flutter version to 1.5.0.
+* Replace invokeMethod with invokeMapMethod wherever necessary.
+
 ## 0.5.15
 
 * Add support for Polygons.

packages/google_maps_flutter/lib/src/controller.dart

diff --git a/packages/google_maps_flutter/lib/src/controller.dart b/packages/google_maps_flutter/lib/src/controller.dart
index b3f3990..af86f89 100644
--- a/packages/google_maps_flutter/lib/src/controller.dart
+++ b/packages/google_maps_flutter/lib/src/controller.dart
@@ -22,10 +22,7 @@
     assert(id != null);
     final MethodChannel channel =
         MethodChannel('plugins.flutter.io/google_maps_$id');
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod('map#waitForMap');
+    await channel.invokeMethod<void>('map#waitForMap');
     return GoogleMapController._(
       channel,
       initialCameraPosition,
@@ -92,10 +89,7 @@
   /// The returned [Future] completes after listeners have been notified.
   Future<void> _updateMapOptions(Map<String, dynamic> optionsUpdate) async {
     assert(optionsUpdate != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod(
+    await channel.invokeMethod<void>(
       'map#update',
       <String, dynamic>{
         'options': optionsUpdate,
@@ -111,10 +105,7 @@
   /// The returned [Future] completes after listeners have been notified.
   Future<void> _updateMarkers(_MarkerUpdates markerUpdates) async {
     assert(markerUpdates != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod(
+    await channel.invokeMethod<void>(
       'markers#update',
       markerUpdates._toMap(),
     );
@@ -128,10 +119,7 @@
   /// The returned [Future] completes after listeners have been notified.
   Future<void> _updatePolygons(_PolygonUpdates polygonUpdates) async {
     assert(polygonUpdates != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod(
+    await channel.invokeMethod<void>(
       'polygons#update',
       polygonUpdates._toMap(),
     );
@@ -145,10 +133,7 @@
   /// The returned [Future] completes after listeners have been notified.
   Future<void> _updatePolylines(_PolylineUpdates polylineUpdates) async {
     assert(polylineUpdates != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod(
+    await channel.invokeMethod<void>(
       'polylines#update',
       polylineUpdates._toMap(),
     );
@@ -162,10 +147,7 @@
   /// The returned [Future] completes after listeners have been notified.
   Future<void> _updateCircles(_CircleUpdates circleUpdates) async {
     assert(circleUpdates != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod(
+    await channel.invokeMethod<void>(
       'circles#update',
       circleUpdates._toMap(),
     );
@@ -176,10 +158,7 @@
   /// The returned [Future] completes after the change has been started on the
   /// platform side.
   Future<void> animateCamera(CameraUpdate cameraUpdate) async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod('camera#animate', <String, dynamic>{
+    await channel.invokeMethod<void>('camera#animate', <String, dynamic>{
       'cameraUpdate': cameraUpdate._toJson(),
     });
   }
@@ -189,21 +168,15 @@
   /// The returned [Future] completes after the change has been made on the
   /// platform side.
   Future<void> moveCamera(CameraUpdate cameraUpdate) async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod('camera#move', <String, dynamic>{
+    await channel.invokeMethod<void>('camera#move', <String, dynamic>{
       'cameraUpdate': cameraUpdate._toJson(),
     });
   }
 
   /// Return [LatLngBounds] defining the region that is visible in a map.
   Future<LatLngBounds> getVisibleRegion() async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    final Map<dynamic, dynamic> latLngBounds =
-        await channel.invokeMethod('map#getVisibleRegion');
+    final Map<String, dynamic> latLngBounds =
+        await channel.invokeMapMethod<String, dynamic>('map#getVisibleRegion');
     final LatLng southwest = LatLng._fromJson(latLngBounds['southwest']);
     final LatLng northeast = LatLng._fromJson(latLngBounds['northeast']);
 

packages/google_maps_flutter/pubspec.yaml

diff --git a/packages/google_maps_flutter/pubspec.yaml b/packages/google_maps_flutter/pubspec.yaml
index 9af1da6..4a94ae6 100644
--- a/packages/google_maps_flutter/pubspec.yaml
+++ b/packages/google_maps_flutter/pubspec.yaml
@@ -27,4 +27,4 @@
 
 environment:
   sdk: ">=2.0.0-dev.47.0 <3.0.0"
-  flutter: ">=0.11.9 <2.0.0"
+  flutter: ">=1.5.0 <2.0.0"