Question

大家好日子如何将Android MainActivity中的字符串值或数据传递给PCL TabbedPage？

MainActivity.cs

 using System;
 using Android.App;
 using Android.Content;
 using Android.Content.PM;
 using Android.Runtime;
 using Android.OS;
 using Android.Telephony;
 using Xamarin.Forms;

   namespace NegDrClient.Droid
   {
   [Activity (Label = "Neg Client", Icon = "@drawable/logo", MainLauncher = true, ScreenOrientation = ScreenOrientation.Portrait)]
   public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
   {

       protected override void OnCreate (Bundle bundle)
       {
           base.OnCreate (bundle);
           global::Xamarin.Forms.Forms.Init (this, bundle);
           global::ZXing.Net.Mobile.Forms.Android.Platform.Init ();
           LoadApplication (new App ());
        }

       public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
       {
           global::ZXing.Net.Mobile.Forms.Android.PermissionsHandler.OnRequestPermissionsResult (requestCode, permissions, grantResults);           
       }

       public string GetNumber()
       {
          TelephonyManager telephonyManager =
            (TelephonyManager) Forms.Context.GetSystemService(Android.Content.Context.TelecomService);
          var number = telephonyManager.Line1Number;
          return number.ToString(); 
       }
     }
   }

我需要调用GetNumber（）方法，以便将其分配给我的登录条目，谢谢。

Answer 1

您可以通过依赖服务执行此操作。

将以下界面添加到您的Xamarin.Forms项目中：

public interface IPhone
{
    string GetNumber();
}

将该界面添加到MainActivity项目中的现有Xamarin.Android：

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity, IPhone

注册该依赖类（在namespace NegDrClient.Droid之上）：

[assembly: Xamarin.Forms.Dependency(typeof(MainActivity))]

现在您可以在Xamarin.Forms项目中调用它：

var GetNumberButton = new Button()
{
    Command = new Command(() => {
        Device.BeginInvokeOnMainThread(() =>
        {
            var number = DependencyService.Get<IPhone>().GetNumber();
            System.Diagnostics.Debug.WriteLine(number);
        });
    })
};

注意：您的GetNumber方法中有错误，应该是：

public string GetNumber()
{
    var telephonyManager = (TelephonyManager)Forms.Context.GetSystemService(Context.TelephonyService);
    return telephonyManager.Line1Number;
}

将字符串数据从Android MainActivity传递到PCL TabbedPage xamarin.form

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