[google_maps_flutter] Avoid AbstractMethod crash (flutter#2113)

Override a default method to work around flutter/flutter#40126. The root
cause of the issue has already been fixed in master and there is a
potential workaround available to apps already, but this is an extra
low-risk change that should prevent the crash for any affected users
while the fix is still rolling out to stable.

Author: Michael Klimushyn

packages/google_maps_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.21+6
+
+* Override a default method to work around flutter/flutter#40126.
+
 ## 0.5.21+5
 
 * Update and migrate iOS example project.

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

@@ -468,6 +468,20 @@ public void dispose() {
     registrar.activity().getApplication().unregisterActivityLifecycleCallbacks(this);
   }
 
+  // @Override
+  // The minimum supported version of Flutter doesn't have this method on the PlatformView interface, but the maximum
+  // does. This will override it when available even with the annotation commented out.
+  public void onInputConnectionLocked() {
+    // TODO(mklim): Remove this empty override once https://github.com/flutter/flutter/issues/40126 is fixed in stable.
+  };
+
+  // @Override
+  // The minimum supported version of Flutter doesn't have this method on the PlatformView interface, but the maximum
+  // does. This will override it when available even with the annotation commented out.
+  public void onInputConnectionUnlocked() {
+    // TODO(mklim): Remove this empty override once https://github.com/flutter/flutter/issues/40126 is fixed in stable.
+  };
+
   @Override
   public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
     if (disposed || activity.hashCode() != registrarActivityHashCode) {

packages/google_maps_flutter/example/android/build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.2'
+        classpath 'com.android.tools.build:gradle:3.5.0'
     }
 }
 

packages/google_maps_flutter/example/android/gradle.properties

@@ -1 +1,2 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true

packages/google_maps_flutter/example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.1-all.zip

packages/google_maps_flutter/example/test_driver/google_maps.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 import 'dart:io';
 
+import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_driver/driver_extension.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -638,4 +639,40 @@ void main() {
 
     expect(topLeft, const ScreenCoordinate(x: 0, y: 0));
   });
+
+  test('testResizeWidget', () async {
+    final Completer<GoogleMapController> controllerCompleter =
+        Completer<GoogleMapController>();
+    final GoogleMap map = GoogleMap(
+      initialCameraPosition: _kInitialCameraPosition,
+      onMapCreated: (GoogleMapController controller) async {
+        controllerCompleter.complete(controller);
+      },
+    );
+    await pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: MaterialApp(
+            home: Scaffold(
+                body: SizedBox(height: 100, width: 100, child: map)))));
+    final GoogleMapController controller = await controllerCompleter.future;
+
+    await pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: MaterialApp(
+            home: Scaffold(
+                body: SizedBox(height: 400, width: 400, child: map)))));
+
+    // We suspected a bug in the iOS Google Maps SDK caused the camera is not properly positioned at
+    // initialization. https://github.com/flutter/flutter/issues/24806
+    // This temporary workaround fix is provided while the actual fix in the Google Maps SDK is
+    // still being investigated.
+    // TODO(cyanglaz): Remove this temporary fix once the Maps SDK issue is resolved.
+    // https://github.com/flutter/flutter/issues/27550
+    await Future<dynamic>.delayed(const Duration(seconds: 3));
+
+    // Simple call to make sure that the app hasn't crashed.
+    final LatLngBounds bounds1 = await controller.getVisibleRegion();
+    final LatLngBounds bounds2 = await controller.getVisibleRegion();
+    expect(bounds1, bounds2);
+  });
 }

packages/google_maps_flutter/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter
-version: 0.5.21+5
+version: 0.5.21+6
 
 dependencies:
   flutter: