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Windows 8 BootCamp
This document provides an overview and introduction to developing applications for the Windows 8 platform. It discusses WinRT basics, best practices, pickers, contracts, tiles, notifications, and process lifetime management. The presenter provides resources for samples, libraries, and tools to help with development for Windows 8.
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Windows 8 BootCamp
- 2. Developing on Windows8 Power point template by Colin Eberhardt
- 3. Agenda WinRT Platform Basics Bestpractices Pickers Contracts Tiles Notifications Process Lifetime Management
- 4. Who am I Einar Ingebrigtsen @einari einar@dolittle.com http://blog.dolittle.com http://www.ingebrigtsen.info
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- 11. Bridging the gap FileOpenPickerpicker = new FileOpenPicker(); picker.FileTypeFilter.Add("*")a; StorageFile file = await picker.PickSingleFileAsync(); Windows.Storage.Streams.IInputStream inputStream = await file.OpenReadAsync(); System.IO.Stream stream = inputStream.AsStreamForRead(); System.IO.StreamReader reader = new StreamReader(stream); string contents = reader.ReadToEnd();
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- 13. Missing things Reflection APIchanged Type details through GetTypeInfo() – extension method Emit namespace practically empty - security
- 14. XAML Originally developed forWindows Vista and exposed as WPF Defines what you see Layout is by default not flowing, as in HTML Can observe changes (Active View)
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- 16. Dependency Object Contains propertybag for DependencyProperties on object Holds attached Dependency Properties DataContext aware
- 17. Dependency Properties A bindableproperty that can hold binding expressions Registered on a DependencyObject Callback when data changes
- 18. Attached Dependency Properties Crosscutting properties Extend other dependency objects with properties they don‟t have
- 19. DataContext Hierarchical Children usesparents datacontext unless explicitly changing it Set DataContext = “Hello World” DataContext = “Hello World” Set DataContext = “Something else” DataContext = “Something else” DataContext = “Hello World”
- 20. Binding Source Defaults toDataContext Can use StaticResource as source Mode OneWay, TwoWay, OneTime – OneWay default Validation ValidatesOnException ValidatesOnNotifyDataErrors INotifyDataErrorInfo
- 21. Binding StringFormat StringFormat =„MMM.dd.yyyy‟ Null and Fallback values TargetNullValue=„(None)‟ FallbackValue=„(Data Context Not Set)‟ IValueConverter
- 22. Element to Element Canbind directly to other elements properties Binds by name of element
- 23. Active View INotifyPropertyChanging /INotifyPropertyChanged INotifyCollectionChanged – ObservableCollection<>
- 24. ValueConverter Simple interface; IValueConverter Convert ConvertBack Converts values during databinding
- 25. TypeConverter Converts data fromXAML to CLR types and back XAML will always give string Can be defined on a DependencyProperty or on an object with attributes pointing to the converter
- 26. Events You still haveevents as before – buttons can be clicked and raise an event RoutedEvents – bubbles through the UI
- 27. Async var data =DownloadData(...); ProcessData(data); STOP DownloadData ProcessData var future = DownloadDataAsync(...); future.ContinueWith(data => ProcessData(data)); DownloadDataAsync ProcessData
- 28. Async Models Windows Runtime: IAsyncOperation<T> .NET Framework : Task<T> C# 5.0 – async / await
- 29. Async – C#style Marked with “async” modifier Must return void or Task<T> Use “await” operator to cooperatively yield control – remember to mark with “async” Feels just like good old synchronous code
- 30. Patterns & Practices MVVM Inspired by PresentationModel by Martin Fowler Good for decoupling – promotes testability Compositioning Commands Actions / Triggers / Behaviors
- 31. MVVM Model View Observes ViewModel Observable
- 32. Compositional UIs Navigation Header Main Content Footer
- 33. Event Aggregator ViewModel 1 ViewModel 2 Aggregator
- 35. Tiles Tap on tileto launch or switch to an app Static default tile specified in app manifest Two sizes: Both sizes can have live updates
- 36. Live Tiles Tiles updatesusing Templates provide Text-only image-only pre-defined templates rich rendering options or combination JPEG or PNG only, Optional “peek” Local or cloud max size 150 KB animation updates
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- 40. Process Lifetime Management Systemmanages application lifetime One foreground full screen window Apps are quickly suspended to preserve battery life
- 41. Suspend System resources focusedon the app that the user is interacting with in the foreground Inactive apps have no impact on battery life or responsiveness, they are suspended by the OS Enables instant switching between apps
- 42. Suspend details Suspended appsare not scheduled by the NT Kernel No CPU, Disk or Network consumed All threads are suspended Apps remain in memory Kernel ensures apps are not suspended in critical sections that could cause system wide deadlocks Apps instantly resumed from suspend when brought to foreground
- 43. Session State SuspensionManager SessionState Property bag that is automatically serialized and saved when suspended Reloads property bag from disk on activation Does not reload state if app crashed Only save and restore user session metadata Tip: Don‟t wait till suspension to put data into SessionState
- 44. Session State :Best practices User using app Launch Save incrementally Restore session App switch Resuming Save navigation Do nothing
- 45. Termination User explicitly closesthe app: soft termination System needs more memory User switch occurs System shutdown Apps crash Apps does not get notified when they are getting terminated
- 46. Process State Transitions User suspending Running Suspended Low Memory Terminated Launches App resuming App App App Splash Code gets to run No code runs App not running screen
- 47. Splash screen System providessplash screen mechanism Shown while Windows launches your app Presented during activation Developer provides color and image in app manifest Apps need to present a window within 15 seconds of activation or the app will be terminated
- 48. Background Audio Playback Appscan play audio in the background Developers must specify background audio in the app manifest Each audio stream is given a type (communication, media, game) Onle one audio stream type may play at a given time
- 49. Upload/Download in thebackground Use the BackgroundTransfer API to upload or download data over HTTP in the background Initiate upload / download from the foreground and it can continue though your app is suspended
- 50. Background tasks Trigger /Condition based System events InternetAvailable NetworkStateChange OnlineIdConnectedStateChange SmsReceived TimeZoneChange Background tasks for lock screen capable apps Control Channel Timer Push Notifications System events for lock screen-capable apps UserPresent UserAway ControlChannelReset SessionConnected LockScreenApplicationAdded LockScreenApplicationRemoved
- 51. Background tasks :resources CPU resource quota Refresh period Lock screen app Non-lock screen app
- 53. Windows Notification Service Enablesdelivery of tile and toast notification over the internet Tile updates and notifications shown to the user even if your app is not running WNS handles communication with your app Scales to millions of users WNS is a free service for your app to use
- 54. Push Notification Overview 1. Request Channel URI 2. Register with your Cloud Service 3. Authenticate & Push Notification
- 55. Toast Notifications Toast notificationsdeliver transient messages outside the context of the app Use toast notifications to get user‟s attention immediately User is in control and can permanently turn off toast notifications from your app Allows quick navigation to a contextually relevant location in your app Toast notifications are easy to invoke from your app or from the cloud
- 56. Toast Templates Uses sametemplate architecture as Live Tiles Rich set of rendering options available
- 58. Contracts Contracts enable integratingthe Windows 8 experience into your app Yields a consistent UI for all apps
- 59. Search Enables your appto interact and respond to Suggestions Search Query
- 60. Settings Consistently given oneplace to get search Context sensitive to the front facing app
- 61. Share Your app canshare anything (text, images, binaries) Automatically filters available applications to share to Your app can be a share target – receive sharing from others Add sharing target as a capability and you can receive share requests
- 62. Play To Ability tostream media to compatible devices
- 64. Data Isolated Storage isthe key http://metrostoragehelper.codeplex.com Database SQL Lite http://timheuer.com/blog/archive/2012/05/20/using-sqlite-in-metro-style-app.aspx
- 65. Summarized Windows RT isa huge leap, both in faith but also technically Consistent API that feels mature from day one Well architected solutions putting the user first Makes us as developers focus on adding the business value
- 66. Resources The samples oftoday http://github.com/einari/toodeloo INPC Weaver http://github.com/SimonCropp/NotifyPropertyWeaver WinRT Toolkit http://jupitertoolkit.codeplex.com Tiny IoC container - WinRT Compatible http://microsliver.codeplex.com/
- 67. Resources MVVM Light http://mvvmlight.codeplex.com/ Setting up push notifications – registering your app https://manage.dev.live.com/build WAT for Windows 8 + WnsRecipe http://watwindows8.codeplex.com/releases/view/73334 Calisto – UI Framework for WinRT https://github.com/timheuer/callisto Get into the store – register as a deveveloper http://msdn.microsoft.com/en-us/windows/apps/
- 68. Thanks for your attention
Editor's Notes
- #16 Visual Studio : Code editor w/ IntellisenseUI Designer DebuggersSimulator Platform window Blend : Code editor WYSIGYG designer Animation Better properties window SimulatorPlatform window
- #36 Metro App = one foreground full screen window that allows the user to work more efficientlyThe other Metro Apps are quickly suspended to preserve battery lifeAs a developer, you have to know how Windows manages your App lifetime and how to be a good citizenApps are suspended 5 seconds after leaving foreground.However, you get 10 seconds instead when you switch from one App to another.You can check it if you launch an App in Snap view and keep the Task Manager in the Filled view (I’m not able to find a workflow that ends up to the 5 seconds…)
- #37 Metro App = one foreground full screen window that allows the user to work more efficientlyThe other Metro Apps are quickly suspended to preserve battery lifeAs a developer, you have to know how Windows manages your App lifetime and how to be a good citizenApps are suspended 5 seconds after leaving foreground.However, you get 10 seconds instead when you switch from one App to another.You can check it if you launch an App in Snap view and keep the Task Manager in the Filled view (I’m not able to find a workflow that ends up to the 5 seconds…)
- #41 Metro App = one foreground full screen window that allows the user to work more efficientlyThe other Metro Apps are quickly suspended to preserve battery lifeAs a developer, you have to know how Windows manages your App lifetime and how to be a good citizenApps are suspended 5 seconds after leaving foreground.However, you get 10 seconds instead when you switch from one App to another.You can check it if you launch an App in Snap view and keep the Task Manager in the Filled view (I’m not able to find a workflow that ends up to the 5 seconds…)
- #42 = “tombstoning” in Windows phone (read http://msdn.microsoft.com/en-us/library/ff817008(v=vs.92).aspx for the execution model in WP)This also visible with SysInternals Process Explorer (http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx) where you see the same “Suspended” in the CPU column. It was possible to “suspend” a process in Windows 7 with Process Explorer: this is now done by Windows itself for Metro Apps.NOTE: Process Explorer is fully aware of Metro Apps = “Immersive” has new blue color. See Options | Configure Colors | Immersive Process + see package in tooltipWhen you right-click | Resume on a Suspended Metro App, it gets back automatically Suspending immediately by Windows
- #46 The user can still decide to explicitly “close”/”end” an App by using ALT+F4 or the following touch gesture = “drag the top of the App and drag it down to the bottom of the screen”: in that case, the App gets the suspend notification after 5 secondsThe system is also allowed to “terminate” the apps.. [users can do it too via task manager or Process Explorer]There is no event fired during termination… you should save all your stuff by “suspending” or even better, along the user navigation in the AppDEMO: use Testlimit64 –d 1024 to consume as much memory (working set) as possible and see that first the Metro App working set are trimmed and then some Apps get terminated (download the tool from http://technet.microsoft.com/en-us/sysinternals/bb963901.aspx)Watch http://channel9.msdn.com/Events/TechEd/NorthAmerica/2011/WCL405 for Mark Russinovich talk about Windows memory management + demos of Testlimit
- #48 Splashscreen and background colors are set in the App manifest.It’s used by Windows to display the first screen before the App code starts to runSame during activation through Contracts
- #49 Splashscreen and background colors are set in the App manifest.It’s used by Windows to display the first screen before the App code starts to runSame during activation through Contracts
- #50 Ex: update cache on a regular basis such as for weekly TV programs
- #51 You can control when the background task runs, even after it is triggered, by adding a condition. Once triggered, a background task will not run until all of its conditions are met. The following conditions (represented by the SystemConditionType enumeration) can be used.For instance : InternetAvailable, InternetNotAvailable,SessionConnected, SessionDisconnected, UserNotPresent, UserPresentControl Channel : Background Tasks can keep a connection alive– ControlChannelTriggerTimer : Background tasks can run as frequently as every 15 minutesPush Notification : Background tasks respond to PushNotificationTrigger to receive raw push notifications
- #52 Resources for background tasks are throttled to make sure the background task is not consuming too much battery (both CPU time and network bandwidth)The throtting is tough for us (humans) to measure because it is CPU time.. When CPU is idle (e.g. making a network call) that does not count against you.. The way the metering happens is that you are allowed a quota within a period and as long as you do not exceed it, you are OK.. Once you exceed it, the system flat out ignores the triggers until the right amount of time has passed so you can’t assume that you’ll be timely called if you exceed your limit-- Network resource constraints are a function of the amount of energy used by the network interface, which is modeled as the amount of time the network is used to transfer bytes (for download or upload); it is not based on any throughput metrics. The throughput and energy usage of a network interface varies based on factors like link capacity, physical position of the device, or the current load on the WiFi network. WiFi networks typically have lower energy consumption per byte sent and received when compared to cellular mobile networks.