我有一个Google地图API密钥,希望在我的Android应用程序和iOS应用程序中使用它来显示地图,并使用Xamarin Forms。您会使用哪个库以避免两个操作系统之间的冲突?
我有一个Google地图API密钥,希望在我的Android应用程序和iOS应用程序中使用它来显示地图,并使用Xamarin Forms。您会使用哪个库以避免两个操作系统之间的冲突?
使用NuGet Xamarin.Forms.GoogleMaps 是实现该功能的简单方法。
Xamarin.Forms.GoogleMaps 功能:
按照以下步骤设置地图:
在所有项目中安装 NuGet 包 Xamarin.Forms.GoogleMaps。
Android。 在 MainActivity.cs 中的 OnCreate 方法中初始化库:
protected override void OnCreate(Bundle savedInstanceState)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
Xamarin.FormsGoogleMaps.Init(this, savedInstanceState); //Initialize GoogleMaps here
LoadApplication(new App());
}
在标签<application>
内添加属性com.google.android.geo.API_KEY
、com.google.android.gms.version
和org.apache.http.legacy
。
同时添加必要的权限ACCESS_COARSE_LOCATION
和ACCESS_FINE_LOCATION
。
如果使用地理位置功能,还需添加一些uses-feature。
你的AndroidManifest.xml应该像这样:
<?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>
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);
}
NSLocationAlwaysUsageDescription
,NSLocationWhenInUseUsageDescription
和 NSLocationAlwaysAndWhenInUseUsageDescription
<? 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>
现在你可以在XAML中添加地图并像以下这样在Android和iOS应用程序中显示它:
<?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>
如果您的应用程序针对API 23或更高版本并且需要访问用户的位置,则必须在运行时检查它是否具有所需的权限,并在没有该权限时请求它。可以按以下方式完成:
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);
}
}