android - 如何从新 Activity 中打开新的 xamarin.forms

Question

开始新 Activity 后，我尝试打开一个新的 xamarin.form，但 SetContentView 方法需要 Android.Views.View 输入，我不知道如何从 xamarin.form 恢复 View

有人可以帮助我吗？谢谢

[Activity(Label = "SecondActivity", Icon = "@drawable/icon", MainLauncher = true, NoHistory = true)]
public class SecondActivity : Activity
{
    public SecondActivity() { }

    protected async override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        UsbSerialPage page = new UsbSerialPage();   // This is a ContentPage

        // Don't work because UsbSerialPage is a ContentPage (xaml) and not an axml page
        SetContentView(Resource.Layout.UsbSerialPage);

        // Don't work because page is not a Android.Views.View
        SetContentView(page);
    }
}

Answer 1

您可以使用 DependencyService调用方法，例如 GetSystemService。

these methods must be in a class inherited from Activity

在Xamarin.Forms中，可以使用Xamarin.Forms.Forms.Context来实现，可以引用this和 this .

更新:

我的测试代码:

using Android.Content;
using Xamarin.Forms;
using App2.Droid;
using Android.Hardware.Usb;

[assembly:Dependency(typeof(SendImpl))]
namespace App2.Droid
{
    class SendImpl : ISend
    {
        public void Send()
        {
            //Intent intent = new Intent("com.worldgn.connector.HR_MEASUREMENT");
            //intent.PutExtra("HR_MEASUREMENT","value");
            //Forms.Context.SendBroadcast(intent);
            UsbManager usbManager= Forms.Context.GetSystemService(Context.UsbService) as UsbManager;
        }
    }
}