namespace Phoneword_Droid
{
    [Activity(Label = "@string/callHistory")]
    public class CallHistoryActivity : ListActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            //从意图中获取传递过来的参数
            var phoneNumbers = Intent.Extras.GetStringArrayList("phone_numbers") ?? new string[0];

            //将字符串数组显示到列表控件中（因为继承的是ListActivity所以整个视图就是一个列表）
            this.ListAdapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, phoneNumbers);

            //关于ArrayAdapter的第二个参数，其实就是指定列表中每个项的视图，后面我们会通过自定义的方式控制列表的项
        }
    }
}

     [Activity(Label = "Phoneword_Droid", MainLauncher = true, Icon = "@drawable/icon")]
     public class MainActivity : Activity
     {
         static readonly List<string> phoneNumbers = new List<string>();

Button callHistoryButton = FindViewById<Button>(Resource.Id.CallHistoryButton);
            callHistoryButton.Click += (e, t) =>
            {
                //指定意图需要打开的活动
                var intent = new Intent(this, typeof(CallHistoryActivity));
                //设置意图传递的参数
                intent.PutStringArrayListExtra("phone_numbers", phoneNumbers);
                StartActivity(intent);
            };

//拨打按钮
                callDialog.SetNeutralButton("Call", delegate
                {
                    //将电话加入到历史记录列表中
                    phoneNumbers.Add(translatedNumber);

                    //如果callHistoryButton的定义在这段代码后面将会出错，所以我们这个时候需要将
                    //Button callHistoryButton = FindViewById<Button>(Resource.Id.CallHistoryButton); 代码提前
                    callHistoryButton.Enabled = true;

                    //使用意图拨打电话
                    var callIntent = new Intent(Intent.ActionCall);

                    //将需要拨打的电话设置为意图的参数
                    callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber));
                    
                    StartActivity(callIntent);
                });