Question

我目前正在努力使用Xamarin对上述API进行极其基本的实现。大多数清单都是从这些交叉引用的教程中复制过来的：

http://docs.xamarin.com/guides/android/platform_features/maps_and_location/part_2_-_maps_api/ https://developers.google.com/maps/documentation/android/start#obtain_a_google_maps_api_key

我的MapFragment的Map属性为null，我无法弄清楚原因。我已成功生成API密钥，并指定了我的包权限，包括将SHA-1指纹/包名称添加到API控制台。这是我的清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1"   android:versionName="1.0" package="@string/package_name">
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="18" />
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17" />

<!-- Google Maps for Android v2 requires OpenGL ES v2 -->
<uses-feature android:glEsVersion="0x00020000" android:required="true" />

<!-- We need to be able to download map tiles and access Google Play Services-->
<uses-permission android:name="android.permission.INTERNET" />

<!-- Allow the application to access Google web-based services. -->
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<!-- Google Maps for Android v2 will cache map tiles on external storage -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<!-- Google Maps for Android v2 needs this permission so that it may check the connection state as it must download data -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<!-- These are optional, but recommended. They will allow Maps to use the My Location provider. -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application android:label="@string/app_name">
    <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="@string/api_key_android" />
    <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
</application>

MAPS_RECIEVE是本教程中的权限，但我发现它现在已经过时，因此省略了它： Android Map V2 - Why MAPS_RECEIVE permission

READ_GSERVICES被检测为未知权限。

这是我的代码：

protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);


        //Create the user interface in code
        LinearLayout layout = new LinearLayout (this);
        layout.Orientation = Orientation.Vertical;
        TextView txtKey = new TextView(this);
        txtKey.Text = "Your key is " + GetString(Resource.String.api_key_android);
        TextView txtNullCheck = new TextView (this);
        txtNullCheck.Text = "Map not null";

        //Create MapFragment and add it to this UI
        MapFragment myMapFrag = MapFragment.NewInstance();
        if (myMapFrag.Map != null) {
            FragmentTransaction fragTx = FragmentManager.BeginTransaction();
            fragTx.Add(layout.Id, myMapFrag);       
            fragTx.Commit();
        }
        else
        {
            txtNullCheck.Text = "Null GoogleMap";
        }


        layout.AddView(txtKey);
        layout.AddView(txtNullCheck);
        SetContentView(layout);




    }

有趣的是，如果我省略空检查并且只是添加MapFragment，那么应用程序会在几秒钟后给我发消息“不幸的是，此应用程序已停止工作”。否则我只会获得一个null myMapFrag.Map，而MapFragment将无法正常运行。

我目前正在Galaxy Note 3上测试它。

我已经被困了很长一段时间了，而且我发现的文档并不是很有帮助。所以任何帮助都将非常感激！

谢谢，

〜F

实施Google Maps Android API v2时无效GoogleMap /崩溃（在Xamarin中）

0 个答案: