xamarin编写拨打电话程序

xamarin 可以很方便的编写一个电话拨号程序，下面的代码是调用android系统的拨号功能，拨号前会给出一个提示信息。

callButton是一个用来拨号的按钮，我们使用它的点击事件来进行拨号，拨号前会有一个提示框

callButton.Click += (object sender, EventArgs e) =>
{
    // On "Call" button click, try to dial phone number. 75271.com
    var callDialog = new AlertDialog.Builder(this);
    callDialog.SetMessage("Call " + translatedNumber + "?");
    callDialog.SetNeutralButton("Call", delegate {
           // Create intent to dial phone
           var callIntent = new Intent(Intent.ActionCall);
           callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber));
           StartActivity(callIntent);
       });
    callDialog.SetNegativeButton("Cancel", delegate { });

    // Show the alert dialog to the user and wait for response.
    callDialog.Show();
};