C# App.Activity类代码示例

        public ViewShowcaseStep(Activity activity, int viewId)
        {
            this.parentActivity = new WeakReference<Activity>(activity);
            this.viewId = viewId;

            Setup();
        }

        public void CriarChamada(Activity activity)
        {
            isRecording = !isRecording;
            if (isRecording)
            {
                // Cria o INTENT
                var voiceIntent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
                voiceIntent.PutExtra(RecognizerIntent.ExtraLanguageModel, RecognizerIntent.LanguageModelFreeForm);

                // Abre um modal com uma mensagem de voz
                voiceIntent.PutExtra(RecognizerIntent.ExtraPrompt, "Diga o nome da pessoa");

                // Se passar de 5.5s considera que não há mensagem falada
                voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputCompleteSilenceLengthMillis, 5500);
                voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputPossiblyCompleteSilenceLengthMillis, 1500);
                voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputMinimumLengthMillis, 15000);
                voiceIntent.PutExtra(RecognizerIntent.ExtraMaxResults, 1);

                // Para chamadas em outras líguas
                // voiceIntent.PutExtra(RecognizerIntent.ExtraLanguage, Java.Util.Locale.German);
                // if you wish it to recognise the default Locale language and German
                // if you do use another locale, regional dialects may not be recognised very well

                voiceIntent.PutExtra(RecognizerIntent.ExtraLanguage, Java.Util.Locale.Default);
                activity.StartActivityForResult(voiceIntent, Constants.VOICE);
            }
        }

 public ProgressShower(Activity activity)
     : base(activity)
 {
     Indeterminate = true;
     SetProgressStyle(ProgressDialogStyle.Horizontal);
     SetButton("Cancel",_click);
 }

        public ExpendListAdapter(Activity activity,
			Dictionary<string, List<string> > dictGroup)
        {
            _dictGroup = dictGroup;
            _activity = activity;
            _lstGroupID = dictGroup.Keys.ToList();
        }

		public MyVote_ChangeButton(Activity context, string imgId, ImageView imgView,int position)
		{
			this.context = context;
			imageID = imgId;
			imageView = imgView;
			this.position = position;
		}

        public SystemUiHiderHoneycomb(Activity activity, View anchorView, int flags)
            : base(activity, anchorView, flags)
        {
            #if __ANDROID_11__
            m_ShowFlags = (int)SystemUiFlags.Visible;
            m_HideFlags = (int)SystemUiFlags.LowProfile;
            m_TestFlags = (int)SystemUiFlags.LowProfile;

            if ((m_Flags & FLAG_FULLSCREEN) != 0)
            {
                // If the client requested fullscreen, add flags relevant to hiding
                // the status bar. Note that some of these constants are new as of
                // API 16 (Jelly Bean). It is safe to use them, as they are inlined
                // at compile-time and do nothing on pre-Jelly Bean devices.
                m_ShowFlags |= (int)SystemUiFlags.LayoutFullscreen;
                m_HideFlags |= (int)SystemUiFlags.LayoutFullscreen | (int)SystemUiFlags.Fullscreen;
            }

            if ((m_Flags & FLAG_HIDE_NAVIGATION) != 0)
            {
                // If the client requested hiding navigation, add relevant flags.
                m_ShowFlags |= (int)SystemUiFlags.LayoutHideNavigation;
                m_HideFlags |= (int)SystemUiFlags.LayoutHideNavigation
                        | (int)SystemUiFlags.HideNavigation;
                m_TestFlags = (int)SystemUiFlags.HideNavigation;
            }
            #endif
        }

		public void BindDataToView(TextView characterCountTextView, Action validate, Activity activity, SuggestionsLayout suggestionsView)
		{
			Validate = validate;
			CharacterCountTextView = characterCountTextView;
			Activity = activity;
			SuggestionsView = suggestionsView;
		}

        private ProtoPadServer(View window, int? overrideListeningPort = null, string overrideBroadcastedAppName = null)
        {
            _window = window;
            _contextActivity = window.Context as Activity;

            _httpServer = new SimpleHttpServer(responseBytes =>
            {
                var response = "{}";
                var remoteCommandDoneEvent = new AutoResetEvent(false);
                _contextActivity.RunOnUiThread(() => Response(responseBytes, remoteCommandDoneEvent, ref response));
                remoteCommandDoneEvent.WaitOne();
                return response;
            });

            IPAddress broadCastAddress;
            using (var wifi = _contextActivity.GetSystemService(Android.Content.Context.WifiService) as WifiManager)
            {
                _mcLock = wifi.CreateMulticastLock("ProtoPadLock");
                _mcLock.Acquire();
                broadCastAddress = GetBroadcastAddress(wifi);
            }

            BroadcastedAppName = overrideBroadcastedAppName ?? String.Format("ProtoPad Service on ANDROID Device {0}", Android.OS.Build.Model);
            ListeningPort = overrideListeningPort ?? 8080;
            LocalIPAddress = Helpers.GetCurrentIPAddress();

            _udpServer = new UdpDiscoveryServer(BroadcastedAppName, String.Format("http://{0}:{1}/", LocalIPAddress, ListeningPort), broadCastAddress);
        }

 public PilotListCounterFragment(string title, PilotListAdapter pilotList, Activity parent)
     : base()
 {
     mTitle = title;
     mPilotList = pilotList;
     mParent = parent;
 }

		//protected override void OnElementChanged(VisualElement oldModel, VisualElement newModel)
		//protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
		protected override void OnDraw(Canvas canvas)
		{
			_activity = this.Context as Activity;
			ActionBar actionBar = _activity.ActionBar;

			if (actionBar.TabCount > 0)
			{
				ActionBar.Tab tabPrompting = actionBar.GetTabAt(0);
				ActionBar.Tab tabActivities = actionBar.GetTabAt(1);
				ActionBar.Tab tabReminders = actionBar.GetTabAt(2);
				ActionBar.Tab tabMapping = actionBar.GetTabAt(3);
				ActionBar.Tab tabSettings = actionBar.GetTabAt(4);

				//Set the tab icons
				tabPrompting.SetIcon(Resource.Drawable.ic_description_white_24dp);
				tabActivities.SetIcon(Resource.Drawable.ic_local_activity_white_24dp);
				tabReminders.SetIcon(Resource.Drawable.ic_schedule_white_24dp);
				tabMapping.SetIcon(Resource.Drawable.ic_map_white_24dp);
				tabSettings.SetIcon(Resource.Drawable.ic_settings_white_24dp);

				//Remove the page's title from the tab
				tabPrompting.SetText("");
				tabActivities.SetText("");
				tabReminders.SetText("");
				tabMapping.SetText("");
				tabSettings.SetText("");

				base.OnDraw(canvas);
			}
		}

        public void OnActivityStarted(Activity activity)
        {
            CrossCurrentActivity.Current.Activity = activity;
#if !XTC
            HockeyApp.Tracking.StartUsage(activity);
#endif
        }

        /// <summary>
        /// 网络是否联通
        /// </summary>
        public static bool isNetworkConnected(Activity active)
        {
            bool net = false;

            ConnectivityManager connManager = (ConnectivityManager)active.GetSystemService(Context.ConnectivityService);

            // connManager.ActiveNetworkInfo ==null   手机无法连接网络
            if (connManager.ActiveNetworkInfo != null)
            {
                //获得 wifi 连接管理
                NetworkInfo networkInfo = connManager.GetNetworkInfo(ConnectivityType.Wifi);
                //获得 GPRS 连接管理
                NetworkInfo gp = connManager.GetNetworkInfo(ConnectivityType.Mobile);
                if (networkInfo != null && networkInfo.IsAvailable != false)
                {
                    //Toast.MakeText(active, "WIFI打开！", ToastLength.Long).Show();
                    net = true;
                }
                // gp.IsConnected==false 有信号无网络
                if (gp != null && gp.IsConnected != false)
                {
                    //Toast.MakeText(active, "有信号gprs打开！", ToastLength.Long).Show();
                    net = true;
                }
            }
            else
            {
                //Toast.MakeText(active, "无法连接到互联网！", ToastLength.Long).Show();
            }
            return net;
        }

		public AdvertisementItemListAdapter(Activity context, List<AdvertisementItemShort> advertisementItems, IInfiniteScrollListener infiniteScrollListener) {
			this.AdvertisementItems = advertisementItems;
			this.context = context;
			this.bitmapOperationService = new BitmapOperationService();
			this.infiniteScrollListener = infiniteScrollListener;
			CalculateSizeForPhotoImageView();
		}

		public MyVote_YesOrNoDialog(Activity context, string imgId, ImageView imgView,int position)
		{
			this.context = context;
			imageId = imgId;
			imageView = imgView;
			this.position = position;
		}

		public UnbindPopWindow (Activity _activity,GuardianInfoListItem item)
		{
			activity = _activity;
			LayoutInflater inflater = (LayoutInflater) activity.GetSystemService (Context.LayoutInflaterService);
			contentView = inflater.Inflate(Resource.Layout.customunbinddialogLayout, null);  

			ContentView = contentView;
			Width = 900;
			Height = 450;
			Focusable = true;
			OutsideTouchable = true;
			//Update ();
			SetBackgroundDrawable (new ColorDrawable());
			AnimationStyle = Resource.Style.AnimationPreview;
			var btn_confirm = contentView.FindViewById<Button> (Resource.Id.btn_confirm);
			btn_confirm.Click += (sender, e) => 
			{
				Dismiss();

				if(UnBindEventHandler != null)
					UnBindEventHandler(item);
		
			};
			var btn_cancel = contentView.FindViewById<Button> (Resource.Id.btn_cancel);
			btn_cancel.Click += (sender, e) => 
			{
				Dismiss();
			};

			DismissEvent += (sender, e) => 
			{
				BackgroundAlpha(1f);

			};
		}