C# AlertDialog.Builder.SetPositiveButton方法代码示例

        public static void MsgBox(Context context,
			string msg, 
			string Titolo = "Vegetha", 
			string PositiveText = "OK", 
			Action PositiveAction = null, 
			string NegativeText ="",
			Action NegativeAction = null)
        {
            AlertDialog.Builder d = new AlertDialog.Builder (context);
            d.SetTitle(Titolo);
            d.SetMessage (msg);
            if (PositiveAction != null) {
                d.SetPositiveButton (PositiveText, (sender, e) => {
                    PositiveAction.Invoke();
                });
            } else {
                d.SetPositiveButton (PositiveText, (sender, e) => {

                });
            }

            if (NegativeAction != null) {
                d.SetNegativeButton (NegativeText, (sender, e) => {
                    NegativeAction.Invoke ();
                });
            }
            d.Show ();
        }

        public static void Alert(Activity context, string title, string message, bool CancelButton, Action<Result> callback = null)
        {
            context.RunOnUiThread(() =>
            {
                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.SetTitle(title);
                builder.SetMessage(message);

                if (callback != null)
                {
                    builder.SetPositiveButton("Ok", (sender, e) =>
                    {
                        callback(Result.Ok);
                    });

                    if (CancelButton)
                    {
                        builder.SetNegativeButton("Cancel", (sender, e) =>
                        {
                            callback(Result.Canceled);
                        });
                    }
                }
                else
                {
                    builder.SetPositiveButton("OK", (sender, e) => { });
                }

                builder.Show();
            });
        }

        public static void AlertYesOrNo(Activity context, string title, string message, Action<Result> callback)
        {
            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.SetTitle(title);
            builder.SetMessage(message);

            if (callback != null)
            {
                builder.SetPositiveButton("Yes", (sender, e) =>
                {
                    callback(Result.Ok);
                });

                builder.SetNegativeButton("No", (sender, e) =>
                {
                    callback(Result.Canceled);
                });
            }
            else
            {
                builder.SetPositiveButton("OK", (sender, e) => { });
            }

            builder.Show();
        }

		/**
	     * Show End User License Agreement.
	     *
	     * @param accepted True IFF user has accepted license already, which means it can be dismissed.
	     *                 If the user hasn't accepted, then the EULA must be accepted or the program
	     *                 exits.
	     * @param activity Activity started from.
	     */
		public static void ShowEula(bool accepted, Activity activity)
		{
			AlertDialog.Builder eula = new AlertDialog.Builder(activity)
				.SetTitle(Resource.String.eula_title)
				.SetIcon(Android.Resource.Drawable.IcDialogInfo)
				.SetMessage(Resource.String.eula_text)
				.SetCancelable(accepted);
			
			if (accepted) 
			{
				eula.SetPositiveButton(Android.Resource.String.Ok, (object dialog, DialogClickEventArgs which) => {
					(dialog as IDialogInterface).Dismiss();	
				});
			} else {
				eula.SetPositiveButton(Resource.String.accept,(object dialog, DialogClickEventArgs which) => {
					SetAcceptedEula(activity);
					(dialog as IDialogInterface).Dismiss();
				})
				.SetNegativeButton(Resource.String.decline, (object dialog, DialogClickEventArgs which) => { 
					(dialog as IDialogInterface).Cancel();
					activity.Finish();
				});
			}
			eula.Show();
		}

 void GetInfo()
 {
     // создаем xml-документ
     XmlDocument xmlDocument = new XmlDocument ();
     // делаем запрос на получение имени пользователя
     WebRequest webRequest = WebRequest.Create ("https://api.vk.com/method/users.get.xml?&access_token=" + token);
     WebResponse webResponse = webRequest.GetResponse ();
     Stream stream = webResponse.GetResponseStream ();
     xmlDocument.Load (stream);
     string name =  xmlDocument.SelectSingleNode ("response/user/first_name").InnerText;
     // делаем запрос на проверку,
     webRequest = WebRequest.Create ("https://api.vk.com/method/groups.isMember.xml?group_id=20629724&access_token=" + token);
     webResponse = webRequest.GetResponse ();
     stream = webResponse.GetResponseStream ();
     xmlDocument.Load (stream);
     bool habrvk = (xmlDocument.SelectSingleNode ("response").InnerText =="1");
     // выводим диалоговое окно
     var builder = new AlertDialog.Builder (this);
     // пользователь состоит в группе "хабрахабр"?
     if (!habrvk) {
         builder.SetMessage ("Привет, "+name+"!\r\n\r\nТы не состоишь в группе habrahabr.Не хочешь вступить?");
         builder.SetPositiveButton ("Да", (o, e) => {
             // уточнив, что пользователь желает вступить, отправим запрос
             webRequest = WebRequest.Create ("https://api.vk.com/method/groups.join.xml?group_id=20629724&access_token=" + token);
              webResponse = webRequest.GetResponse ();
         });
         builder.SetNegativeButton ("Нет", (o, e) => {
         });
     } else {
         builder.SetMessage ("Привет, "+name+"!\r\n\r\nОтлично! Ты состоишь в группе habrahabr.");
         builder.SetPositiveButton ("Ок", (o, e) => {
         });
     }
     builder.Create().Show();
 }

        public async void ForgotPassword(View view)
        {
            ProgressDialog dialog = DialogHelper.CreateProgressDialog("Please wait...", this);
            dialog.Show();

            EditText StudentId = FindViewById<EditText>(Resource.Id.forgotStudentId);
            AuthService ForgotPasswordService = new AuthService();
            GenericResponse Response = await ForgotPasswordService.ForgotPassword(StudentId.Text);
            dialog.Hide();

            if (Response.Success)
            {

                AlertDialog.Builder builder = new AlertDialog.Builder(this, Resource.Style.LightDialog);
                builder.SetTitle("Password Reset Sent");
                builder.SetMessage("Please check your emails to reset your password");
                builder.SetCancelable(false);
                builder.SetPositiveButton("OK", delegate { Finish(); });
                builder.Show();
            }
            else
            {
                DialogHelper.ShowDialog(this, Response.Message, Response.Title);
            }
        }

		protected override async void OnResume()
		{
			base.OnResume ();

			Title = DataHolder.Current.CurrentCity.Name;

			// Load pollutions
			pollutionService = new PollutionService(Settings.ApiBaseUrl);
			var pollutions = await pollutionService.GetPollutionForCity(DataHolder.Current.CurrentCity.Zip);
			if (pollutions == null) 
			{
				// An error occured
				var builder = new AlertDialog.Builder(this);
				builder.SetTitle(GetString(Resource.String.error_header));
				builder.SetMessage(GetString(Resource.String.pollution_error_body));
				builder.SetPositiveButton (GetString (Android.Resource.String.Ok), (senderAlert, args) => {});
				builder.Show();
			} else {
				DataHolder.Current.CurrentPollutions = pollutions;
			}				

			// Initialize tabs
			AddPollutionDayTab(Resources.GetString(Resource.String.tab_today), 0);
			AddPollutionDayTab(Resources.GetString(Resource.String.tab_tomorrow), 1);
			AddPollutionDayTab(Resources.GetString(Resource.String.tab_aftertomorrow), 2);

			// Hide loading indicator
			var loading = FindViewById<ProgressBar> (Resource.Id.pbLoading);
			loading.Visibility = ViewStates.Gone;
		}

		protected override void OnCreate (Bundle bundle)
		{
			base.OnCreate (bundle);
			SetContentView (Resource.Layout.Splash);
			new Handler ().PostDelayed (() => {
				//LoadActivity();
				var updateManager = new UpdateManager(this,true);
				if (updateManager.CheckUpdate())
				{
					var builder = new AlertDialog.Builder (this).SetTitle ("软件升级").SetMessage ("发现新版本,建议更新使用新版本").SetOnKeyListener(this).SetCancelable(false);
					builder.SetPositiveButton ("下载", (sender, e) => {
						noticeDialog.Dismiss();	
						//显示下载对话框,下载
						updateManager.ShowDownloadDialog();
					});
					builder.SetNegativeButton ("以后再说", (sender, e) => {
						noticeDialog.Dismiss();	
						LoadActivity();
					});
					noticeDialog= builder.Create ();
					noticeDialog.Show();
				}
				else
				{
					LoadActivity();
				}
			},2000);
		
			// Create your application here
		}

		protected void CreateChatRooms(){
			chatroomsAdapter = new ChatRoomsAdapter (this);
			var chatRoomsListView = FindViewById<ListView> (Resource.Id.chatroomsListView);
			chatRoomsListView.Adapter = chatroomsAdapter;
			chatRoomsListView.ItemClick += (object sender, AdapterView.ItemClickEventArgs e) => {
				ChatRoom currChatRoom = chatroomsAdapter.GetChatRoomAt(e.Position);
				var intent = new Intent(this, typeof(ChatRoomActivity));
				intent.PutExtra("chatroom", currChatRoom.webID);
				StartActivity(intent);
			};
			chatRoomsListView.ItemLongClick += async (object sender, AdapterView.ItemLongClickEventArgs e) => {
				AlertDialog.Builder alert = new AlertDialog.Builder(this);
				alert.SetTitle("Do you want to delete this chatroom?");
				alert.SetPositiveButton("Yes", (senderAlert, args) => {
					ChatRoom currChatRoom = chatroomsAdapter.GetChatRoomAt(e.Position);
					ParsePush.UnsubscribeAsync (currChatRoom.webID);
					ChatRoomUser cru = DatabaseAccessors.ChatRoomDatabaseAccessor.DeleteChatRoomUser(DatabaseAccessors.CurrentUser().webID, currChatRoom.webID);
					DatabaseAccessors.ChatRoomDatabaseAccessor.DeleteChatRoom(currChatRoom.webID);
					ParseChatRoomDatabase pcrd = new ParseChatRoomDatabase();
					pcrd.DeleteChatRoomUserAsync(cru);
					Console.WriteLine("ERASED");
					chatroomsAdapter.NotifyDataSetChanged();

				});
				alert.SetNegativeButton("No", (senderAlert, args) => {
				});	
				alert.Show();
			};
		}

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            String extra = Intent.GetStringExtra("User") ?? "Data not available";

            var builder = new AlertDialog.Builder(this);
            builder.SetTitle("Logged in");
            builder.SetMessage(extra);
            builder.SetPositiveButton("Ok", delegate { Finish(); });
            builder.Create().Show();

            // Create your application here
            SetContentView(Resource.Layout.Home);

            TextView textView = FindViewById<TextView>(Resource.Id.textView_Username);
            textView.Text = extra;

            Button goToBogdan = FindViewById<Button>(Resource.Id.button_Veres);
            Button goToMiki = FindViewById<Button>(Resource.Id.button_Miki);

            goToBogdan.Click += (sender, args) =>
            {
                var bogdan = new Intent(this, typeof(Bogdan));
                StartActivity(bogdan);
            };

            goToMiki.Click += (sender, args) =>
            {
                var miki = new Intent(this, typeof(Miki));
                StartActivity(miki);
            };
        }

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

            // Set our view from the "main" layout resource
            SetContentView (Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button> (Resource.Id.loginButton);

            button.Click += delegate {
                //set alert for executing the task
                var alert = new AlertDialog.Builder (this);

                alert.SetTitle ("Login Popup");

                alert.SetPositiveButton ("OK", (senderAlert, args) => {

                });

                alert.SetMessage ("Logged In");

                //run the alert in UI thread to display in the screen
                RunOnUiThread (() => {
                    alert.Show ();
                });
            };
        }

        public bool showConfirmDialog(Context context, string info)
        {
            if (!prepareModal())
                return false;
            // reset choice
            mChoice = false;

            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.SetMessage(info);
            builder.SetCancelable(false);
            builder.SetPositiveButton("OK", (object o, Android.Content.DialogClickEventArgs e) =>
                {
                    this.mQuitModal = true;
                    this.mChoice = true;
                    builder.Dispose();
                });

            builder.SetNegativeButton("Cancel", (object o, Android.Content.DialogClickEventArgs e) =>
                {
                    mQuitModal = true;
                    mChoice = false;
                    builder.Dispose(); // probably wrong
                });

            AlertDialog alert = builder.Create();
            alert.Show();

            doModal();
            return mChoice;
        }

		private void initListeners()
		{
			create.Click += delegate 
			{
				if(!validdateForm()) return;
				create.Enabled = false;
				var task = Task<TournamentModel>.Factory.StartNew(() => ServerData.createTournament(name.Text, Session.Instance().CurrentUser.Id));
				task.ContinueWith(x =>     
				{
					create.Enabled = true;
					try 
					{
						if (x.Exception != null) throw x.Exception.InnerException;
						// Success
						Session.Instance().selectedTournament = task.Result;
						StartActivity(typeof(TournamentDetails));
						Finish();
					}
					catch (WebException e)
					{
						var builder = new AlertDialog.Builder(this);
						builder.SetMessage("Er is iets mis met de verbinding, probeer het later opnieuw.");
						builder.SetCancelable(false);
						builder.SetPositiveButton("OK", delegate { });
						builder.Show();
					}
				},
				TaskScheduler.FromCurrentSynchronizationContext());
			};
		}

        public async void Register(View view)
        {
            ProgressDialog dialog = DialogHelper.CreateProgressDialog("Registering...", this);
            dialog.Show();

            RegisterRequest request = new RegisterRequest
            {
                FirstName = FindViewById<EditText>(Resource.Id.registerFirstName).Text,
                LastName = FindViewById<EditText>(Resource.Id.registerLastName).Text,
                StudentId = FindViewById<EditText>(Resource.Id.registerStudentId).Text,
                Password = FindViewById<EditText>(Resource.Id.registerPassword).Text
            };
            
            GenericResponse Response = await Services.Auth.Register(request);
            dialog.Hide();

            if (Response.Success)
            {
                AlertDialog.Builder builder = new AlertDialog.Builder(this, Resource.Style.LightDialog);
                builder.SetTitle("Successfully Registered");
                builder.SetMessage("Please check your UTS email for instructions to confirm your account");
                builder.SetCancelable(false);
                builder.SetPositiveButton("OK", delegate { Finish(); });
                builder.Show();
            }
            else
            {
                DialogHelper.ShowDialog(this, Response.Message, Response.Title);
            }
        }

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

#if __ANDROID_14__
            Window.RequestFeature(WindowFeatures.ActionBar);
            ActionBar.SetDisplayHomeAsUpEnabled(ViewModel.CanGoBack);
#endif

            SetContentView(Resource.Layout.identityproviderlistview);

            _loadingToken = ViewModel.WeakSubscribe(() => ViewModel.LoadingIdentityProviders, (sender, args) =>
            {
                if (ViewModel.LoadingIdentityProviders)
                    LoadingDialog.Show();
                else
                    LoadingDialog.Dismiss();

                InvalidateOptionsMenu();
            });

            ViewModel.LoginError += (sender, args) =>
            {
                var builder = new AlertDialog.Builder(this);
                builder.SetTitle("Error");
                builder.SetIcon(Android.Resource.Drawable.IcDialogAlert);
                builder.SetMessage(args.Message);
                builder.SetPositiveButton("Dismiss", (s, e) => { });
                builder.Create().Show();
            };
        }