Forms Android SMS

forms 定义接口

using System;
using System.Collections;
using System.Collections.Generic;

namespace 
{
    public interface ISystemSms
    {
        //发送短信
        void SendSms (string num, string context);
    }
}

平台实现
using System;
using System.Collections;
using System.Collections.Generic;
using Xamarin.Forms;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Telephony;

using 

[assembly:Dependency(typeof(SystemSms))]
namespace 
{
    public class SystemSms : Java.Lang.Object,ISystemSms
    {
        public SystemSms()
        {
        }

        public void SendSms(string num,string context)
        {
            var smsUri = Android.Net.Uri.Parse("smsto:"+num);
            var smsIntent = new Intent (Intent.ActionSendto, smsUri);
            smsIntent.PutExtra ("sms_body", context);  
            ((Activity)Forms.Context).StartActivity (smsIntent);
            //Application.Context.StartActivity (smsIntent);

        }
    }

}