Xamarin表格-如何获得屏幕亮度和串行端口？

Question

I would like to create a page showing all the hardware of the device, including the brightness and the serial ports. How should I do?

Answer 1

If want to get brightness , using DependencyService will be a good way.

First implement the interface :

public interface IBrightnessService
{
    void SetBrightness(float factor);
    float GetBrightness();
}

Then in Forms where you want to get or set methods :

SET:

var brightnessService = DependencyService.Get<IBrightnessService>();
brightnessService.SetBrightness((float)0.5);

GET:

var brightnessService = DependencyService.Get<IBrightnessService>();
Console.WriteLine("brightness is:" + brightnessService.GetBrightness());

In Android , create AndroidBrightnessService :

[assembly: Xamarin.Forms.Dependency(typeof(AndroidBrightnessService))]
namespace App6.Droid
{
    public class AndroidBrightnessService : IBrightnessService
    {
        [Obsolete]
        public float GetBrightness()
        {
            //throw new NotImplementedException();
            //var window = ((Activity)Forms.Context).Window;

            //var attributesWindow = new WindowManagerLayoutParams();

            //attributesWindow.CopyFrom(window.Attributes);

            var brightness = Android.Provider.Settings.System.GetInt(MainActivity.thisMainActivity.ContentResolver, Android.Provider.Settings.System.ScreenBrightness);
            //MainActivity.thisMainActivity is a isntance from activity
            //The returned brightness is an int type value between 0 and 255.
            return brightness;
        }

        [Obsolete]
        public void SetBrightness(float brightness)
        {
            //throw new NotImplementedException();
            var window = ((Activity)Forms.Context).Window;
            //var window = CrossCurrentActivity.Current.Activity.Window;
            var attributesWindow = new WindowManagerLayoutParams();

            attributesWindow.CopyFrom(window.Attributes);
            attributesWindow.ScreenBrightness = brightness;

            window.Attributes = attributesWindow;
        }
    }
}

Note : MainActivity.thisMainActivity is a isntance from activity:

public static MainActivity thisMainActivity;

onCreate method:

thisMainActivity = this;

In IOS , Cretae iOSBrightnessService :

[assembly: Dependency(typeof(iOSBrightnessService))]
namespace App6.iOS
{
    public class iOSBrightnessService : IBrightnessService
    {
        public float GetBrightness()
        {
            //throw new NotImplementedException();
            return (float)UIScreen.MainScreen.Brightness;
        }

        public void SetBrightness(float brightness)
        {
            //throw new NotImplementedException();
            UIScreen.MainScreen.Brightness = brightness;
        }
    }
}

Note: App6 is the name of my project.

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About serial ports , I haven't used in my project, however this should exist only in android .I think this needs to be referenced by some libraries (such as .so file) on the basis of DependencyService.

Here is a Nuget Package can be refer ( Xamarin.Android.SerialPort ).And a sample project you can have a look.