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[英]How to remove polyline from the map on button click in Xamarin.Forms
[英]How to open Google play books from a button click using Xamarin.Forms?
我正在Xamarin.Forms中开发一个具有用于书籍的按钮的应用程序。 如果操作系统是iOS,我希望它打开iBooks,如果是android,我希望它打开Google Play图书
我的iBooks部分已关闭,但是如何从应用程序的android版本中单击按钮打开Google Play图书?
这是我的xaml代码:
<StackLayout Orientation="Horizontal" MinimumHeightRequest="30" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<Button Image="books.png" HorizontalOptions="CenterAndExpand" BackgroundColor="Transparent" Clicked="OpenBooks" />
<Button Image="settings.png" HorizontalOptions="EndAndExpand" BorderColor="Transparent" BackgroundColor="Transparent" Clicked="gotosettings" />
</StackLayout>
这是我的C#代码:
public void OpenBooks(object sender, EventArgs e)
{
switch (Device.OS)
{
case TargetPlatform.iOS:
Device.OpenUri(new Uri("itms-books"));
break;
case TargetPlatform.Android:
//open google play books code here
break;
}
}
任何帮助都将是惊人的!
预先感谢!
在android平台上,您应该知道google play book的软件包名称,并检查是否已安装。
在PCL部分中,无法通过Device.OpenUri("packagename");
来实现Device.OpenUri("packagename");
您应该使用依赖项服务来打开Google Play图书应用,而Google Play图书应用的软件包名称为com.google.android.apps.books
:
在PCL端定义接口:
namespace OpenBooks_Demo
{
public interface OpenBookInterface
{
void openBooks();
}
}
在andorid端实现接口:
[assembly: Xamarin.Forms.Dependency(typeof(OpenBookImp))]
namespace OpenBooks_Demo.Droid
{
public class OpenBookImp : Java.Lang.Object, OpenBookInterface
{
public OpenBookImp() { }
public void openBooks()
{
var ctx = Forms.Context;
Intent launchIntent = new Intent();
launchIntent = ctx.PackageManager.GetLaunchIntentForPackage("com.google.android.apps.books");
if (launchIntent != null)
{
ctx.StartActivity(launchIntent);//null pointer check in case package name was not found
}
else
{
try
{
ctx.StartActivity(new Intent(Intent.ActionView, Android.Net.Uri.Parse("market://details?id=" + "com.google.android.apps.books")));
}
catch (Exception e)
{
ctx.StartActivity(new Intent(Intent.ActionView, Android.Net.Uri.Parse("https://play.google.com/store/apps/details?id=" + "com.google.android.apps.books")));
}
}
}
}
}
然后在PCL端调用openBooks方法:
public void OpenBooks(object sender, EventArgs e)
{
switch (Device.OS)
{
case TargetPlatform.iOS:
Device.OpenUri(new Uri("itms-books"));
break;
case TargetPlatform.Android:
DependencyService.Get<OpenBookInterface>().openBooks();
break;
}
}
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