颤振未处理异常:MissingPluginException(没有在通道plugins.fltter.io/google_map_0上找到方法map#waitForMap的实现)

Question

我已经把谷歌地图很好地集成在我的颤振项目。几天来，我一直在安卓模拟器、安卓设备和iOS模拟器上测试它。一切看起来都很好。然后，我主要集中在iOS模拟器的测试上。但昨晚，当我在Android设备和模拟器上运行这个项目时，地图打开了，但没有反应。我犯了一个错误：

**E/flutter (18971): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: MissingPluginException(No implementation found for method map#waitForMap on channel plugins.flutter.io/google_maps_0)
E/flutter (18971): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:165:7)
E/flutter (18971): <asynchronous suspension>
E/flutter (18971): #1      GoogleMapController.init (package:google_maps_flutter/src/controller.dart:30:5)
E/flutter (18971): <asynchronous suspension>
E/flutter (18971): #2      _GoogleMapState.onPlatformViewCreated (package:google_maps_flutter/src/google_map.dart:394:44)
E/flutter (18971): <asynchronous suspension>
E/flutter (18971):** 

此错误只影响安卓端，而不影响iOS端！经过调查，我发现Google 没有初始化！原因是什么，如何解决呢？

Answer 1

在android/app/build.gradle中设置minSdkVersion

android {
    defaultConfig {
        minSdkVersion 20
    }
}

在应用程序清单android/app/src/main/AndroidManifest.xml中指定API键

<manifest ...
  <application ...
    <meta-data android:name="com.google.android.geo.API_KEY"
               android:value="YOUR KEY HERE"/>

运行flutter clean，flutter pub get然后flutter run