C# Views.View类代码示例

        // Check touch position on button
        public bool OnTouch(View v, MotionEvent e)
        {
            switch (e.Action)
            {
                // Get the x and y position for a touch (always before move)
                case MotionEventActions.Down:
                    old_x = e.GetX ();
                    old_y = e.GetY ();
                    Console.WriteLine ("x = " + old_x + " y = " + old_y);
                    break;
                // Get the x and y position difference continously
                case MotionEventActions.Move:
                    // Get the difference between current position and old position
                    new_x = e.GetX () - old_x;
                    new_y = e.GetY () - old_y;
                    // Convert to int, to remove decimal numbers (apparently can't be send through the tcp listener)
                    int_x = Convert.ToInt32 (new_x);
                    int_y = Convert.ToInt32 (new_y);
                    // Convert to string, so it can be send
                    send_x = Convert.ToString (int_x);
                    send_y = Convert.ToString (int_y);

                    // Send x and y position over two messages
                    Connect (ipAddress, send_x);
                    Connect (ipAddress, send_y);

                    // Set old position to current position
                    old_x = e.GetX ();
                    old_y = e.GetY ();
                    break;
            }
            return true;
        }

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

            SetContentView(Resource.Layout.Main);

            _view = FindViewById<LinearLayout>(Resource.Id.parentLayout);
            _text = FindViewById<TextView>(Resource.Id.logTextView);

            UpdateDisplay(INITIAL_MESSAGE,Color.White);

            var beaconManager = new BeaconManager(this);

            indoorLocationController = new IndoorLocationController(beaconManager);
            indoorLocationController.BeaconFound += HandleBeaconFound;
            indoorLocationController.BeaconLost += HandleBeaconLost;

            var beacon1 = DummyBeaconCreator.CreateBeaconUrsin();
            var beacon2 = DummyBeaconCreator.CreateBeaconMarcel();
            indoorLocationController.AddBeaconsAndStart(new List<Beacon>{beacon1,beacon2});

            if (!IsBluetoothAvailable)
            {
                Toast.MakeText(this, "Please activate Bluetooth! iBeacons works only when Bluetooth available.",ToastLength.Long).Show();
            }
        }

        protected override void OnListItemClick(ListView l, View v, int position, long id)
        {
            var url = _adapter.GetMapUrl (position);
            var intent = new Intent (Intent.ActionView, Uri.Parse(url));

            StartActivity (intent);
        }

 private void DeleteClicked(View view)
 {
     var vm = GetViewVm(view);
     _dataContext.DeleteTodo(vm.Todo);
     _todoVms.Remove(vm);
     NotifyDataSetChanged(); // trigger view reset so item disappears
 }

        private void Initialize (Context ctx)
        {
            var dm = ctx.Resources.DisplayMetrics;
            var inflater = LayoutInflater.FromContext (ctx);

            overlayInset = (int)TypedValue.ApplyDimension (ComplexUnitType.Dip, 45, dm);

            backgroundView = new SliceView (ctx) {
                StartAngle = 0,
                EndAngle = 360,
                Color = emptyPieColor,
            };
            AddView (backgroundView);

            loadingOverlayView = inflater.Inflate (Resource.Layout.PieChartLoading, this, false);
            AddView (loadingOverlayView);

            emptyOverlayView = inflater.Inflate (Resource.Layout.PieChartEmpty, this, false);
            emptyOverlayView.Visibility = ViewStates.Gone;
            AddView (emptyOverlayView);

            statsOverlayView = inflater.Inflate (Resource.Layout.PieChartStats, this, false);
            statsOverlayView.Visibility = ViewStates.Gone;
            AddView (statsOverlayView);

            statsTimeTextView = statsOverlayView.FindViewById<TextView> (Resource.Id.TimeTextView);
            statsMoneyTextView = statsOverlayView.FindViewById<TextView> (Resource.Id.MoneyTextView);

            Click += delegate {
                // Deselect slices on click. The Clickable property is set to true only when a slice is selected.
                ActiveSlice = -1;
            };
            Clickable = false;
        }

        public virtual View CreateView(View parent, string name, Context context, IAttributeSet attrs)
        {
            // resolve the tag name to a type
            var viewType = ViewTypeResolver.Resolve(name);

            if (viewType == null)
            {
                //MvxBindingTrace.Trace(MvxTraceLevel.Error, "View type not found - {0}", name);
                return null;
            }

            try
            {
                var view = Activator.CreateInstance(viewType, context, attrs) as View;
                if (view == null)
                {
                    MvxBindingTrace.Trace(MvxTraceLevel.Error, "Unable to load view {0} from type {1}", name,
                                          viewType.FullName);
                }
                return view;
            }
            catch (ThreadAbortException)
            {
                throw;
            }
            catch (Exception exception)
            {
                MvxBindingTrace.Trace(MvxTraceLevel.Error,
                                      "Exception during creation of {0} from type {1} - exception {2}", name,
                                      viewType.FullName, exception.ToLongString());
                return null;
            }
        }

        public override void OnViewCreated (View view, Bundle savedInstanceState)
        {
            base.OnViewCreated (view, savedInstanceState);

            ListView.SetClipToPadding (false);
            ListAdapter = new SettingsAdapter ();
        }

		public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
		{
			View v = inflater.Inflate (Resource.Layout.WebViewDialog, container, false);

			txtTitle = v.FindViewById<TextView> (Resource.Id.txt_dialog_title);
			divider = v.FindViewById<View> (Resource.Id.title_divider);
			webView = v.FindViewById<WebView> (Resource.Id.dialog_web_view);

			if (title == null || title.Length < 1) {
				txtTitle.Visibility = divider.Visibility = ViewStates.Gone;
			} else {
				txtTitle.Text = title;
			}

			if (url != null && url.Length > 0) {
				webView.LoadUrl (url);
			}

			if (showOkay) {
				btnOk.Visibility = ViewStates.Visible;
				btnOk.Click += (object sender, EventArgs e) => {
					this.Dismiss ();
				};
			}

			return v;
		}

		public override View GetView (Context context, View convertView, ViewGroup parent)
		{
			var view = new RelativeLayout(context);
						
            var parms = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent,
                                                        ViewGroup.LayoutParams.WrapContent);

            view.SetMinimumHeight(150);
            parms.SetMargins(5, 3, 5, 0);
            parms.AddRule(LayoutRules.AlignParentLeft);

			_caption = new TextView (context);
			SetCaption (Caption);
            view.AddView(_caption, parms);
			
			if (!String.IsNullOrWhiteSpace (Indicator)) {
	            var tparms = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent,
	                                                         ViewGroup.LayoutParams.WrapContent);
	            tparms.SetMargins(5, 3, 5, 5);
	            tparms.AddRule(LayoutRules.CenterVertical);
				tparms.AddRule(LayoutRules.AlignParentRight);
	
	            _text = new TextView (context) {
					Text = Indicator,
					TextSize = 22f
				};
	            view.AddView(_text, tparms);
			}
			return view;
		}

        public override void OnListItemClick(ListView p0, View p1, int position, long p3)
        {
            Fragment newContent = null;
            switch (position)
            {
                case 0:
                    newContent = new ColorFragment(Resource.Color.red);
                    break;
                case 1:
                    newContent = new ColorFragment(Resource.Color.green);
                    break;
                case 2:
                    newContent = new ColorFragment(Resource.Color.blue);
                    break;
                case 3:
                    newContent = new ColorFragment(Resource.Color.white);
                    break;
                case 4:
                    newContent = new ColorFragment(Resource.Color.black);
                    break;
            }

            if (newContent != null)
                SwitchFragment(newContent);
        }

		public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent) {
			View container = View.Inflate(parent.Context, Resource.Layout.list_item_child, null);
			TextView txtGroupName = (TextView)container.FindViewById(Resource.Id.txtExampleName);
			ExampleFragment child = (ExampleFragment)this.GetChild(groupPosition, childPosition);
			txtGroupName.Text = child.Title();
			return container;
		}

 public View CreateTabContent(string tag)
 {
     var v = new View(_context);
     v.SetMinimumHeight(0);
     v.SetMinimumWidth(0);
     return v;
 }

		public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
			view = inflater.Inflate(Resource.Layout.TeamsFragment, container, false);
			if(listTeams.Count == 0) {
				//display text that there are currently no events and hide list with events
				view.FindViewById(Resource.Id.teamsFragmentListTeams).Visibility = ViewStates.Gone;
			} else {
				//display list with events and hide the text
				view.FindViewById(Resource.Id.teamsFragmentNoTeams).Visibility = ViewStates.Gone;

				listView = view.FindViewById<ListView>(Resource.Id.teamsFragmentListTeams);
				listView.Adapter = new ListTeamsAdapter(this, listTeams);
				listView.ItemClick += OnListItemClick;
			}

			if(DB_Communicator.getInstance().isAtLeast(VBUser.GetUserFromPreferences().getUserType(), UserType.Coremember)) {
				view.FindViewById<LinearLayout>(Resource.Id.teamsFragmentBtnAddLine).Visibility = ViewStates.Visible;
			} else {
				view.FindViewById<LinearLayout>(Resource.Id.teamsFragmentBtnAddLine).Visibility = ViewStates.Gone;
			}

			view.FindViewById<Button>(Resource.Id.teamsFragmentBtnAdd).Click += (object sender, EventArgs e) => {
				ViewController.getInstance().mainActivity.switchFragment(ViewController.TEAMS_FRAGMENT, 
					ViewController.ADD_TEAM_FRAGMENT, new AddTeamFragment());
			};

			return view;
		}

        public override View GetView(Context context, View convertView, ViewGroup parent)
		{
            this.Click = delegate { SelectImage(); };

            Bitmap scaledBitmap = Bitmap.CreateScaledBitmap(_image, dimx, dimy, true);

            var view = convertView as RelativeLayout;
            if (view == null)
            {
                view = new RelativeLayout(context);
                _imageView = new ImageView(context);
            }
            else
            {
                _imageView = (ImageView)view.GetChildAt(0);
            }
            _imageView.SetImageBitmap(scaledBitmap);
            
            var parms = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
            parms.SetMargins(5, 2, 5, 2);
            parms.AddRule( LayoutRules.AlignParentLeft);
			if(_imageView.Parent != null && _imageView.Parent is ViewGroup)
				((ViewGroup)_imageView.Parent).RemoveView(_imageView);
			view.AddView(_imageView, parms);

            return view;
		}

		protected override AView GetCellCore(Cell item, AView convertView, ViewGroup parent, Context context)
		{
			Performance.Start();
			var cell = (ViewCell)item;

			var container = convertView as ViewCellContainer;
			if (container != null)
			{
				container.Update(cell);
				Performance.Stop();
				return container;
			}

			BindableProperty unevenRows = null, rowHeight = null;
			if (ParentView is TableView)
			{
				unevenRows = TableView.HasUnevenRowsProperty;
				rowHeight = TableView.RowHeightProperty;
			}
			else if (ParentView is ListView)
			{
				unevenRows = ListView.HasUnevenRowsProperty;
				rowHeight = ListView.RowHeightProperty;
			}

			IVisualElementRenderer view = Platform.CreateRenderer(cell.View);
			Platform.SetRenderer(cell.View, view);
			cell.View.IsPlatformEnabled = true;
			var c = new ViewCellContainer(context, view, cell, ParentView, unevenRows, rowHeight);

			Performance.Stop();

			return c;
		}