如何在Xamarin中将DPI设备获取到PCL.形式?

问题描述：

我需要在Xamarin类PCL中获得DPI设备.我不想使用Xamarin.Essentials.如果可以的话，我可以使用本机接口执行此操作吗?

I need to get DPI device in my Xamarin class PCL. I do not want to use Xamarin.Essentials. Can I do this using Native interfaces, if its possible, how can I do it?

答

在您的pcl中创建一个名为IDisplayInfo的新接口:

in your pcl create a new interface called IDisplayInfo:

public interface IDisplayInfo
{
    int GetDisplayWidth();
    int GetDisplayHeight();
    int GetDisplayDpi();
}

在您的android实现中，添加一个新类:

In your android implementation, add a new class:

[assembly: Dependency(typeof(DisplayInfo))]
namespace YourAppNamespace.Droid
{
    public class DisplayInfo : IDisplayInfo
    {
        public int GetDisplayWidth()
        {
            return (int)Android.App.Application.Context.Resources.DisplayMetrics.WidthPixels;
        }

        public int GetDisplayHeight()
        {
            return (int)Android.App.Application.Context.Resources.DisplayMetrics.HeightPixels;
        }

        public int GetDisplayDpi()
        {
            return (int)Android.App.Application.Context.Resources.DisplayMetrics.DensityDpi;
        }
    }
}

，然后在iOS实现中添加相同的类:

and in the iOS implementation, add the same class:

[assembly: Dependency(typeof(DisplayInfo))] 
namespace YourNamespace.iOS
{
    public class DisplayInfo : IDisplayInfo
    {
        public int GetDisplayWidth()
        {
            return (int)UIScreen.MainScreen.Bounds.Width;
        }

        public int GetDisplayHeight()
        {
            return (int)UIScreen.MainScreen.Bounds.Height;
        }

        public int GetDisplayDpi()
        {
            return (int)(int)UIScreen.MainScreen.Scale;
        }
    }
}

现在在您的共享代码中，您可以调用

Now in your shared code, you can call

int dpi = DependencyService.Get<IDisplayInfo>().GetDisplayDpi();

，应该很好.请注意，我还添加了获取屏幕宽度和高度的方法，基本上是因为我已经在代码中包含了它们，并且无论如何您迟早都需要它们.

and should be good to go. Note that i also added methods for getting screen width and height, basically because i already had them in my code and since you are probably going to need them sooner or later anyways.

如何在Xamarin中将DPI设备获取到PCL.形式?

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