Google maps 如何在Xamarin表单（Android和iOS）中实现谷歌地图？

我有一个Google map API密钥，我想用它在我的Android应用程序和iOS应用程序中使用Xamarin表单显示地图。您会使用哪个库来减少两个操作系统上的冲突？

一种简单的实现方法是使用NuGet

Xamarin.Forms.GoogleMaps功能：

• 地图类型
• 交通图
• 地图事件
• 动画平移
• 直接平移
• 别针
• 定制别针
• 引脚拖放
• 多边形
• 线条
• 圈
• 自定义地图分幅

---

按照以下步骤在项目中设置地图：

在所有项目中安装NuGet包Xamarin.Forms.GoogleMaps

Android。在OnCreate方法中初始化MainActivity.cs中的库：

在您的AndroidManifest.xml中

在标签内添加属性

com.google.android.geo.API_KEY

com.google.android.gms.version

org.apache.http.legacy

还添加所需的权限

ACCESS\u rough\u LOCATION

ACCESS\u FINE\u LOCATION

如果要使用地理定位，请添加一些uses功能

您的AndroidManifest.xml应如下所示：

    <?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="yvan.eht.nioj" android:installLocation="auto">
        <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
        <application android:label="YourApp.Android">
            <meta-data android:name="com.google.android.geo.API_KEY" android:value="Your_Api_Key_Here" />
            <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
            <uses-library android:name="org.apache.http.legacy" android:required="false" />
        </application>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-feature android:name="android.hardware.location" android:required="false" />
        <uses-feature android:name="android.hardware.location.gps" android:required="false" />
        <uses-feature android:name="android.hardware.location.network" android:required="false" />
    </manifest>

    <?xml version="1.0" encoding="utf-8"?>
    <ContentPage
        xmlns="http://xamarin.com/schemas/2014/forms"
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
        xmlns:d="http://xamarin.com/schemas/2014/forms/design"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:maps="clr-namespace:Xamarin.Forms.GoogleMaps;assembly=Xamarin.Forms.GoogleMaps"
        mc:Ignorable="d"
        x:Class="YourApp.MainPage">
        <ContentPage.Content>
            <Grid HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
    
                <maps:Map x:Name="map" VerticalOptions="FillAndExpand"></maps:Map>
            </Grid>
        </ContentPage.Content>
    </ContentPage>

在您的Info.plist中添加属性

NSLocationAlwaysUsageDescription

nsLocationWhenUsageDescription

nsLocationAlways和WhenUsageDescription

在MainActivity类中，添加以下OnStart覆盖：

（如果使用的是Xamarin Essentials，则不需要）在MainActivity类中，添加以下OnRequestPermissionsResult覆盖：

---

您可以标记它，这将帮助更多有相同问题的人：）。

   public override bool FinishedLaunching(UIApplication app, NSDictionary options)
   {
       global::Xamarin.Forms.Forms.Init();
       Xamarin.FormsGoogleMaps.Init("Your_Api_Key_Here");
       LoadApplication(new App());

       return base.FinishedLaunching(app, options);
   }

    <? xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
      <dict>
        <!--Your other Permissions may be on top -->
        <!-- Just add the Permissions below -->

        <key>NSLocationAlwaysUsageDescription</key>
        <string>Can we use your location at all times?</string>
        <key>NSLocationWhenInUseUsageDescription</key>
        <string>Can we use your location when your application is being used?</string>
        <key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
        <string>Can we use your location at all times?</string>
      </dict>
    </plist>

    <?xml version="1.0" encoding="utf-8"?>
    <ContentPage
        xmlns="http://xamarin.com/schemas/2014/forms"
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
        xmlns:d="http://xamarin.com/schemas/2014/forms/design"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:maps="clr-namespace:Xamarin.Forms.GoogleMaps;assembly=Xamarin.Forms.GoogleMaps"
        mc:Ignorable="d"
        x:Class="YourApp.MainPage">
        <ContentPage.Content>
            <Grid HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
    
                <maps:Map x:Name="map" VerticalOptions="FillAndExpand"></maps:Map>
            </Grid>
        </ContentPage.Content>
    </ContentPage>

    const int RequestLocationId = 0;
    
    readonly string[] LocationPermissions =
    {
        Manifest.Permission.AccessCoarseLocation,
        Manifest.Permission.AccessFineLocation
    };

    protected override void OnStart()
    {
        base.OnStart();
    
        if ((int)Build.VERSION.SdkInt >= 23)
        {
            if (CheckSelfPermission(Manifest.Permission.AccessFineLocation) != Permission.Granted)
            {
                RequestPermissions(LocationPermissions, RequestLocationId);
            }
            else
            {
                // Permissions already granted - display a message.
            }
        }
    }

    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
    {
        if (requestCode == RequestLocationId)
        {
            if ((grantResults.Length == 1) && (grantResults[0] == (int)Permission.Granted))
                // Permissions granted - display a message.
            else
                // Permissions denied - display a message.
        }
        else
        {
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }